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Split Core Current Transformer
CR3100 Series The CR3100 Series Split Core Current Transformer is
designed to provide a low cost method to monitoring electrical
current. A unique hinge and locking snap allows attachment
without interrupting the current-carrying wire. High
secondary turn will develop signals up to 10.0 VAC across a
burden resistor.
Applications
Portable Instruments
Sub-Metering
Monitor Motor Loads
Features
Small Size
Low Cost
High Secondary Turns
Secure Locking Hinge
Specifications
Maximum Continuous Primary Current 4 X Ir
Insulation Voltage 3500 Vac/1min
Storage Temp. -45°C thru +85°C
Operating Temp. -40°C thru +65 °C
Regulatory Agencies
A B
C
D E
F
OUTLINE DRAWING
CR3110-3000
CR3111-3000
V =
I x R
Te
VL
I
I
R V
DCR
For best linearity, choose R such that V < 0.8 VL
VL = Vmax - Te
I x DCR
SPLIT CORE CURRENT TRANSFORMERS
Part Number Imax Vmax RMS Te (typ.) DCR Ω Frequency
CR3109-1500 30 5 1510 187 20 - 1 KHz
CR3110-3000 75 15 3100 515 20 - 1 KHz
CR3111-3000 100 19 3150 390 20 - 1 KHz
CR3113-2000 150 16 2125 58 20 - 1 KHz
CR3113-2000
PART NUMBERS
CR3109 - 1500 30 AMP
CR3110 - 3000 75 AMP
CR3111 - 3000 100 AMP
CR3113 - 2000 150 AMP
Ir = Maximum Input Current to be linearly sensed Vmax = Maximum Voltage (Saturation) CT will develop
Te = Effective turns ratio including losses (All Specifications tested at 60 Hz)
CR3110-3000 ONLY
CR3109-1500
Part Number A B C D E F
CR3109-1500 0.76
(19.2)
0.19
(4.90)
1.24
(31.5)
6.10
(1.55)
0.82
(20.8)
0.20
(5.08)
CR3110-3000 1.00
(25.5)
0.40
(10.2)
1.57
(40.0)
5.91
(150)
1.04
(26.5)
0.24
(6.10)
CR3111-3000 1.24
(31.4)
0.62
(15.7)
1.77
(45.0)
6.10
(155)
1.22
(31.0)
0.20
(5.08)
CR3113-2000 2.68
(68.7)
0.98
(24.9)
2.56
(65.0)
118
(3000)
0.72
(18.4)
0.20
(5.08)
Split Core Current Transformer
Secondary Volts
3.0
2.5
2.0
1.5
1.0
0.5
0
0 50 100 150 200 250 300
2 OHMS
5 OHMS
10 OHMS
PRIMARY AMPERES
610-1000T The 610-1000T Split Core Current Transformer is designed for
assembly to an existing electrical installation without the need for
dismantling the primary bus or cables. It incorporates a snap fit
between the fixed and removable sections.
This transformer is intended for use with high input impedance
devices that require signal voltages up to 5 VAC.
The output can be rectified and filtered for devices requiring DC
input. The non-linearity and voltage drop of the rectifiers and
filters must be considered in the choice of the loading
impedance.
Application
For Energy Management Systems and Instrumentation
Equipment having a High Input Impedance, eg. 14K ohms
minimum
Frequency
50-400 Hz
Insulation Level
0.6 kV, BIL 10 kV full wave
Construction
The core and windings are encased in UL approved plastic
Continuous Thermal Current Rating
Factor 330A at 30° C amb
250A at 55° C amb
Flexible Leads
UL 1015 105° C, CSA approved, #18 AWG, 24” long unless
otherwise specified
Approximate Weight
10 oz
Regulatory Agencies
OUTLINE DRAWING
PART NUMBERS
610 - 1000T 1000 Turns
0.78
2.75
1.30
2.84 1.47
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Current Transformers
103
F
613 Series The 613 Series Split Core Current Transformer is designed
for assembly to an existing electrical installation without the
need for dismantling the primary bus or cables.
The Model 613-1000T is intended for use with high input
impedance devices that require signal voltages up to 5 VAC.
The output can be rectified and filtered for devices requiring
DC input. The non-linearity and voltage drop of the rectifiers
and filters must be considered in the choice of the loading
impedance.
Application
For Energy Management Systems and Instrumentation
Equipment
Frequency
50-400Hz
Insulation
0.6 kV, BIL 10 kV full wave
Construction
The core and windings are encased in UL approved plastic
Continuous Thermal Current Rating
Factor Models 613-101 – 613-401:
1.33 at 30° C amb
1.00 at 55° C amb
Model 613-1000T:
330A at 30° C amb
250A at 55° C amb
Flexible Leads
UL 1015 105° C, CSA approved, #16 AWG, 24” long unless
otherwise specified
Approximate Weight
1 lb
Caution
Proper safety precautions must be followed during installation
by a trained electrician. Never install while bus is energized.
The current transformer must have its secondary terminals
short circuited or the burden connected, before energizing
the primary circuit.
Regulatory Agencies
Secondary Volts
3.0
2.5
2.0
1.5
1.0
0.5
0
0 50 100 150 200 250 300
2 OHMS
5 OHMS
10 OHMS
PRIMARY AMPERES
0.90
1.25
1.95
3.70
0.80
2.70
OUTLINE DRAWING
Split Core Current Transformer
PART NUMBERS
Part Number Current Ratio Burden VA Accuracy at 60 Hz
613-101 100:5 1.00 ±5%
613-1250 125:5 1.25 ±5%
613-151 150:5 1.50 ±5%
613-1750 175:5 1.75 ±5%
613-201 200:5 2.50 ±4%
613-251 250:5 2.50 ±4%
613-301 300:5 3.00 ±2%
613-401 400:5 3.00 ±2%
613-1000T 100:0.1 See Graph ±3%
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F
Split Core Current Transformer
TYPICAL PERFORMANCE CHARACTERISTICS MODEL 603-500T
(WITH 500 TURNS)
SECONDARY VOLTS
5.0
4.0
3.0
2.0
1.0
0
0 50 100 150 200 250 300
2 OHMS
5 OHMS
10 OHMS
PRIMARY AMPERES
603 & 603D Series
The 603 & 603D Split Core Current Transformers are
designed for assembly to an existing electrical installation
without the need for dismantling the primary bus or cables.
These transformers are intended for use with high input
impedance devices that require signal voltages up to 5 VAC.
The output can be rectified and filtered for devices
requiring DC input. The non-linearity and voltage drop of
the rectifiers and filters must be considered in the choice of
the loading impedance.
Application
For Energy Management Systems and Instrumentation
Equipment Having a High Input Impedance, eg. 14K ohms
minimum
Frequency
50-400Hz
Construction
The core and windings are encased in UL approved plastic
Insulation Level
0.6 kV, BIL 10 kV full wave
Continuous Thermal Current Rating
Factor Model 603:
350A at 30° C amb.
260A at 55° C amb.
Flexible Leads
UL 1015 105° C, CSA approved, #22 AWG, 24” long unless
otherwise specified
Approximate Weight
Model 603-500T: 10 oz.
Model 603D-500T: 12 oz.
Regulatory Agencies
OUTLINE DRAWING
PART NUMBERS
603 - 500T 500 Turns
603D - 500T 500 Turns
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Current Transformers
105
F
604 Series The 604 Series Split Core Current Transformer is designed
for assembly to an existing electrical installation without the
need for dismantling the primary bus or cables.
The Model 604-1000T is intended for use with high input
impedance devices.
The output can be rectified and filtered for devices
requiring DC input. The non-linearity and voltage drop of the
rectifiers and filters must be considered in the choice of the
loading impedance.
Application
For Energy Management Systems and Instrumentation
Frequency
50-400Hz
Insulation Level
0.6 kV, BIL 10 kV full wave
Continuous Thermal Current Rating
Factor Models 604-101 – 604-401:
1.33 at 30° C amb
1.00 at 55° C amb
Model 604-1000T:
450A at 30° C amb
350A at 55° C amb
Terminals
10-32 brass studs with one flatwasher and two regular nuts
Flexible Leads
UL 1015 105° C, CSA approved, #16 AWG, 24” long unless
otherwise specified
Approximate Weight
2.5 lbs
Regulatory Agencies
Split Core Current Transformer
PART NUMBERS
Part Number Current Ratio Burden VA Accuracy at 60 Hz
604-101 100:5 1.00 ±5%
604-1250 125:5 1.00 ±5%
604-151 150:5 1.00 ±4%
604-1750 175:5 1.00 ±3%
604-201 200:5 1.00 ±2%
604-251 250:5 2.00 ±2%
604-301 300:5 2.00 ±1.5%
604-351 350:5 2.50 ±1.5%
604-401 400:5 2.50 ±1.5%
604-1000T 100:0.1 See Graph ±3%
TYPICAL PERFORMANCE CHARACTERISTICS MODEL 604-1000T
(WITH 1000 TURNS)
SECONDARY VOLTS
PRIMARY AMPERES
20
18
16
14
12
10
8
6
4
2
0
0 10 20 30 40 50 60 70 80 90 100
50 OHMS
100 OHMS
150 OHMS
200 OHMS
4.12
1.53
1.42
3.52
4.78
3.38
1.20
2.50
OUTLINE DRAWING
The Professional
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M N TI
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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F
Split Core Current Transformer
600 & 601 Series
The 600 & 601 Series Split Core Current Transformers are
designed for assembly to an existing electrical installation without
the need for dismantling the primary bus or cables.
Application
For Energy Management Systems and Instrumentation
Frequency
50-400Hz
Construction
The core and windings are encased in UL approved plastic
Insulation Level
0.6 kV, BIL 10 kV full wave
Continuous Thermal Current Rating
Factor 1.33 at 30° C amb
1.00 at 55° C amb
Terminals
8-32 brass studs with one flatwasher and two regular nuts
Flexible Leads
UL 1015 105° C, CSA approved, #16 AWG, 24” long unless
otherwise specified
Approximate Weight
1.5 lbs.
Caution
Proper safety precautions must be followed during installation
by a trained electrician. Never install while bus is energized.
The current transformer must have its secondary terminals
short circuited or the burden connected, before energizing
the primary circuit.
Regulatory Agencies
PART NUMBERS
Part Number Current Ratio
VA at
1% Class
ANSI Metering Class at 60Hz
Part Number Current Ratio
VA at
1% Class
ANSI Metering Class at 60Hz
BO.1 BO.2 BO.5 BO.1 BO.2 BO.5
600-401 400:5A 1.5 2.4 -------- 601-401 400:5A 1.0 4.8 -------- --------
600-501 500:5A 2.0 2.4 -------- 601-501 500:5A 1.5 4.8 4.8 --------
600-601 600:5A 2.5 2.4 2.4 -------- 601-601 600:5A 2.0 2.4 4.8 --------
600-801 800:5A 5.0 1.2 1.2 2.4 601-801 800:5A 2.5 1.2 2.4 4.8
600-102 1000:5A 7.5 1.2 1.2 2.4 601-102 1000:5A 5.0 1.2 1.2 4.8
600-122 1200:5A 15.0 0.6 1.2 1.2 601-122 1200:5A 10.0 1.2 1.2 2.4
600-152 1500:5A 20.0 0.6 0.6 1.2 601-152 1500:5A 15.0 1.2 1.2 1.2
600-162 1600:5A 20.0 0.6 0.6 1.2 601-162 1600:5A 15.0 1.2 1.2 1.2
600-202 2000:5A 30.0 0.6 0.6 0.6 601-202 2000:5A 20.0 0.6 0.6 1.2
OUTLINE DRAWING
4.25
2.00
7.75
5.50
3.50 0.38
1.13
6.00 0.38
1.13
6.75
4.50
6.75
4.50
(2) 0.19 DIA. HOLES (2) 0.19 DIA. HOLES
H1 H1
X1 X2 X1 X2
THIS END
REMOVABLE
THIS END
REMOVABLE
THIS END
REMOVABLE
THIS END
REMOVABLE
LABEL
X1 X2
H1
H1
X1 X2
LABEL
LABEL
MODEL 600 MODEL 601
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Current Transformers
107
F
108
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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Current Transformers
F
606 & 608 Series The 606 & 608 Split Core Current Transformers are designed
for assembly to an existing electrical installation without the need
for dismantling the primary bus or cables. These current transformers
are a weather proof design suitable for use outdoor or in
direct burial applications. The transformer cases are UV stabilized
thermoplastic and filled with polyurethane resin. The mating surfaces
of the transformer cores are protected by a rubber ‘O’ ring.
Application
For Energy Management Systems and Instrumentation
Equipment
Frequency
50-400Hz
Insulation Level
0.6 kV, BIL 10 kV full wave
Continuous Thermal Current Rating Factor
Model 606: 1.33 at 30° C amb., 1.00 at 55° C amb Models
608-501 – 608-202:
1.33 at 30° C amb., 1.00 at 55° C amb Models
608-252 – 608-322:
1.00 at 30° C amb., 0.70 at 55° C amb
Secondary Cable
Two No. 16 AWG, 6’ Long, Direct Burial, UV Res. UL Type TC
Weight
Model 606: 4.5 lbs
Model 608: 7.5 lbs
Regulatory Agencies
Split Core Current Transformer
PART NUMBERS
Part
Number
Current
Ratio
Burden
VA
ANSI Metering Class at
60Hz
Part
Number
Current
Ratio
Burden
VA
ANSI Metering Class at
60Hz
606-201 200:5A 2.5 1% 608-501 500:5A 6.0 1%
606-251 250:5A 3.0 1% 608-601 600:5A 8.0 1%
606-301 300:5A 3.5 1% 608-801 800:5A 12.0 1%
606-351 350:5A 4.0 1% 608-102 1000:5A 13.0 1%
606-402 400:5A 5.0 1% 608-122 1200:5A 16.0 1%
606-501 500:5A 6.0 1% 608-152 1500:5A 25.0 1%
606-601 600:5A 8.0 1% 608-162 1600:5A 27.0 1%
606-751 750:5A 10.0 1% 608-202 2000:5A 33.0 1%
606-801 800:5A 12.0 1% 608-252 2000:5A 42.0 1%
606-102 1000:5A 15.0 1% 608-302 3000:5A 50.0 1%
606-122 1200:5A 20.0 1% 608-322 3200:5A 54.0 1%
6.05
606-2.75
608-2.60
606-2.70
608-6.25
606-5.80
608-9.25
1.75
OUTLINE DRAWING
The 500 Series Split Core Current Transformer is designed to be assembled
around an existing conductor or bus bar. The end marked “This end removable”
may be disassembled and then reassembled around the conductors.
Terminals are 8-32 brass studs with one flatwasher, lockwasher and regular
nut. Flexible Leads are UL 1015 105° C, CSA approved, #16 AWG, 24” long
unless otherwise specified
How to order take apart C.T.’S
109
Current Transformers
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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F
Application
Metering
Frequency
50-400Hz
Insulation Level
0.6 kV, BIL 10 kV full wave
Continuous Thermal Current Rating Factor
1.33 at 30° C amb., 1.00 at 55° C amb
Approximate Weight
8 to 18 lbs
Regulatory Agencies
The accuracy table below is for the 500T-041 X 117. Accuracies for other sizes are
available from the factory. The dimensions in the table at the left are
standard sizes. Other window lengths (B1) may be accommodated on special order.
Window widths (A1) other than those listed are not available.
500 X- XXX X XXX - XXX
T or L for Terminals or Leads
Model Window width (A1)
The letter “X”
must appear here Window length (B1)
Ratio
Example: 500 T - 041 X 117 - 133
Split Core Current Transformer
DIMENSIONS MAX RATIO
‘A1’ ‘A2’ ‘A3’ ‘B1’ ‘B2’ ‘B3’
4.1 6.4 7.3 7.1 10.0 10.9 4000:5
4.1 6.4 7.3 11.7 14.5 15.4 8000:5
4.1 6.4 7.3 14.1 17.0 17.9 8000:5
4.1 6.4 7.3 18.1 21.0 21.9 8000:5
4.1 6.4 7.3 24.0 27.0 27.9 10000:5
4.1 6.4 7.3 30.1 33.0 33.9 10000:5
5.1 7.2 8.3 7.1 10.0 10.9 4000:5
5.1 7.2 8.3 11.7 14.5 15.4 8000:5
5.1 7.2 8.3 14.1 17.0 17.9 8000:5
5.1 7.2 8.3 18.1 21.0 21.9 8000:5
5.1 7.2 8.3 24.0 27.0 27.9 10000:5
5.1 7.2 8.3 30.1 33.0 33.9 10000:5
5.8 7.0 9.0 7.1 10.0 10.9 4000:5
5.8 7.0 9.0 11.7 14.5 15.4 8000:5
5.8 7.0 9.0 14.1 17.0 17.9 8000:5
5.8 7.0 9.0 18.1 21.0 21.9 8000:5
5.8 7.0 9.0 24.0 27.0 27.9 10000:5
5.8 7.0 9.0 30.1 33.0 33.9 10000:5
8.0 9.5 11.1 7.1 10.0 10.9 4000:5
8.0 9.5 11.1 11.7 14.5 15.4 8000:5
8.0 9.5 11.1 14.1 17.0 17.9 8000:5
8.0 9.5 11.1 18.1 21.0 21.9 8000:5
8.0 9.5 11.1 24.0 27.0 27.9 10000:5
8.0 9.5 11.1 30.1 33.0 33.9 10000:5
10.1 11.6 13.2 7.1 10.0 10.9 4000:5
10.1 11.6 13.2 11.7 14.5 15.4 8000:5
10.1 11.6 13.2 14.1 17.0 17.9 8000:5
10.1 11.6 13.2 18.1 21.0 21.9 8000:5
10.1 11.6 13.2 24.0 27.0 27.9 10000:5
10.1 11.6 13.2 30.1 33.0 33.9 10000:5
Current Ratio Accuracy class with U.P.F. burden
300:5 ±5% at 1.5 VA
400:5 ±3% at 2.5 VA
500:5 ±2% at 2.5 VA
600:5 ±1% at 4 VA
750:5 ±1% at 5 VA
800:5 ±1% at 5 VA
1000:5 ±1% at 7.5 VA
1200:5 ±1% at 10.0 VA
1500:5 ±1% at 12.5 VA
2000:5 ±1% at 15.0 VA
2500:5 ±1% at 25.0 VA
3000:5 ±1% at 25.0 VA
3500:5 ±1% at 25.0 VA
4000:5 ±1% at 25.0 VA
5000:5 ±1% at 30.0 VA
5000:5 ±1% at 40.0 VA
Model 500 Series
OUTLINE DRAWING
A1 B3 B2
B1
A3
A2
0.75
0.44
1.63
(4) 0.31 Dia. holes
110 Current Transformers
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F
CR3120, CR3130, CR3140 Series The CR3120, CR3130, CR3140 Split Core Current
Transformers are designed for assembly to an existing electrical
installation without the need for dismantling the primary bus or
cables. The CR3120, CR3130, CR3140 Series has
one of the highest industry standards both for interleaving and the
self locking mechanism.
Application
For Energy Management Systems and Instrumentation
Equipment
Frequency
50-400Hz
Insulation Level
0.6 kV, BIL 10 kV full wave
Features:
Output 0.333 VAC at Rated Current
Phase Angle <2 degrees measured at 50% rated current
Linearity Accuracy +/- 1%
Secondary Cable
Two No. 16 AWG, 8’ Long,
Weight
CR3120: 1.0 lbs
CR3130: 1.0 lbs
CR3140: 1.0 lbs
Regulatory Agencies
Split Core Current Transformer
B
A
C
D
E
ONE TURN
CUSTOMER SUPPLIED
BLK
WHT
OUTLINE DRAWING
PART NUMBERS
Part
Number
Current
Ratio
Part
Number
Current
Ratio
Part
Number
Current
Ratio
CR3120-5 5:0.333V CR3130-50 50:0.333V CR3140-100 100:0.333V
CR3120-10 10:0.333V CR3130-100 100:0.333V CR3140-200 200:0.333V
CR3120-25 25:0.333V CR3130-150 150:0.333V CR3140-400 400:0.333V
CR3120-50 50:0.333V CR3130-200 200:0.333V CR3140-600 600:0.333V
CR3120-70 70:0.333V CR3130-250 250:0.333V CR3140-800 800:0.333V
CR3120-100 100:0.333V CR3130-300 300:0.333V CR3140-1000 1000:0.333V
CR3120-150 150:0.333V CR3130-400 400:0.333V CR3140-1200 1200:0.333V
CR3120-200 200:0.333V CR3130-600 600:0.333V CR3140-1500 1500:0.333V
SIZE CR3120 CR3130 CR3140
A
2.00
(50.8)
3.25
(82.6)
4.75
(120.7)
B 2.10
(53.3)
3.35
(85.1)
5.00
(127)
C 0.61
(15.2)
1.00
(25.4)
1.00
(25.4)
D 0.75
(19.05)
1.25
(31.75)
2.00
(50.8)
E 0.75
(19.05)
1.25
(31.75)
2.00
(50.8)
Medium Voltage Current Transformer
CTW3-60-T50 & CTWH3-60-T50
Applications
Metering and relaying.
Frequency
50 - 400 Hz.
Maximum System Voltage
5.6kV, BIL 60kV full wave.
Continuous Thermal Current Rating
Factor
1.50 at 30° C amb., 1.33 at 55° C amb.
150:5 and 600:5
1.33 at 30° C amb., 1.00 at 55° C amb. 250:5
1.00 at 30° C amb., 0.85 at 55° C amb.
Primary Terminals
1/2-13 bolts with one Belleville washer.
Secondary Terminals
Brass studs No. 10-32 with one flatwasher, lockwasher and
regular nut.
Supplied with short circuiting secondary terminal cover
Vacuum cast in polyurethane resin.
Other ratios, secondary currents and dual ratios are available.
Refer to factory.
The transformers are tested for partial discharge to Canadian
Standards CAN3-C13-M83. This test can also be carried out to
IEC requirements if requested.
Approximate weight
20 lbs.
Regulatory Agencies
1.12 7.00
5.50
0.66
WITHOUT PRIMARY BARS
0.50
13.00
12.00
9.25
B
SLOTS H1 H2
0.56 X 0.75
BOTH SIDES
4.75
3.75
0.62 5.75
H1 H2
(4) SLOTS
0.40 X 0.66
A
5.50
BAR SIZES
PRIMARY
CURRENT
DIMENSIONS
5 TO 150A
A B
200 TO 600A
0.19 1.50
0.25 2.00
WITH PRIMARY BARS
CTW3-60-T50-050 5:5 T50 0.3 0.3 0.3 0.6 1.2 375
CTW3-60-T50-100 10:5 T50 0.3 0.3 0.3 0.6 1.2 1000
CTW3-60-T50-150 15:5 T50 0.3 0.3 0.3 0.6 1.2 1690
CTW3-60-T50-200 20:5 T50 0.3 0.3 0.3 0.6 1.2 1900
CTW3-60-T50-250 25:5 T50 0.3 0.3 0.3 0.6 1.2 2700
CTW3-60-T50-300 30:5 T50 0.3 0.3 0.3 0.6 1.2 2700
CTW3-60-T50-400 40:5 T50 0.3 0.3 0.3 0.6 1.2 4720
CTW3-60-T50-500 50:5 T50 0.3 0.3 0.3 0.6 1.2 4720
CTW3-60-T50-750 75:5 T50 0.3 0.3 0.3 0.6 1.2 8630
CTW3-60-T50-101 100:5 T50 0.3 0.3 0.3 0.6 1.2 8630
CTW3-60-T50-151 150:5 T50 0.3 0.3 0.3 0.6 1.2 14380
CTW3-60-T50-201 200:5 T50 0.3 0.3 0.3 0.6 1.2 17250
CTW3-60-T50-251 250:5 T50 0.3 0.3 0.3 0.6 1.2 17250
CTW3-60-T50-301 300:5 T50 0.3 0.3 0.3 0.6 1.2 37800
CTW3-60-T50-401 400:5 T50 0.3 0.3 0.3 0.6 1.2 37800
CTW3-60-T50-501 500:5 T50 0.3 0.3 0.3 0.6 1.2 37800
CTW3-60-T50-601 600:5 T50 0.3 0.3 0.3 0.6 1.2 37800
Part Number*
Current
Ratio
Relay
Class B0.1 B0.2 B0.5 B0.9 B1.8
ANSI Metering Class at 60 Hz **Thermal Current Rating 1
second RMS Amps
CAUTION: Use only the Belleville washers supplied. Tighten to between 25 and 30 foot-pounds. Do not overtighten.
* For ordering with primary bars, change model number to CTWH3.
** With a burden of B 0.1 or greater connected to the secondary.
BAR SIZES
PRIMARY CURRENT
DIMENSIONS
A B
5 TO 250A 0.19 1.50
300 TO 1200A 0.25 2.00
OUTLINE DRAWING
111
Current Transformers
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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F
112 Current Transformers
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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F
Medium Voltage Current Transformer
Medium Voltage Current Transformer
CTWH3-60-T100
Applications
Metering and relaying.
Frequency
50 - 400 Hz.
Maximum System Voltage
5.6kV, BIL 60kV full wave.
Continuous Thermal Current Rating
Factor
1.50 at 30° C amb., 1.33 at 55° C amb.
250:5, 1000:5 & 1200:5-
1.10 at 30° C amb., 0.85 at 55° C amb.
Primary Terminals
Plated copper bars. See chart for sizes.
Secondary Terminals
Brass screws No. 10-32 with one flatwasher and
one lockwasher.
Vacuum cast in polyurethane resin.
Other ratios, secondary currents and dual ratios are available.
Refer to factory.
The transformers are tested for partial discharge to Canadian
Standards CAN3-C13-M83. This test can also be carried out to
IEC requirements if requested.
Approximate weight
41 lbs.
Regulatory Agencies
(2) HOLES
0.56 DIA.
(2) SLOTS
0.56 X 0.75
15.00
14.00
11.25
5.63
7.25
5.75
B
A
H1 H2
X1 X2
Part Number*
Current
Ratio
Relay
Class B0.1 B0.2 B0.5 B0.9 B1.8
ANSI Metering Class at 60 Hz **Thermal Current Rating 1
second RMS Amps
CTWH3-60-T100-050 5:5 T100 0.3 0.3 0.3 0.3 0.3 470
CTWH3-60-T100-100 * 10:5 T100 0.3 0.3 0.3 0.3 0.3 900
CTWH3-60-T100-150 * 15:5 T100 0.3 0.3 0.3 0.3 0.3 1600
CTWH3-60-T100-200 * 20:5 T100 0.3 0.3 0.3 0.3 0.3 1900
CTWH3-60-T100-250 * 25:5 T100 0.3 0.3 0.3 0.3 0.3 2600
CTWH3-60-T100-300 * 30:5 T100 0.3 0.3 0.3 0.3 0.3 2900
CTWH3-60-T100-400 * 40:5 T100 0.3 0.3 0.3 0.3 0.3 3800
CTWH3-60-T100-500 * 50:5 T100 0.3 0.3 0.3 0.3 0.3 4700
CTWH3-60-T100-750 * 75:5 T100 0.3 0.3 0.3 0.3 0.3 5900
CTWH3-60-T100-101 * 100:5 T100 0.3 0.3 0.3 0.3 0.3 8600
CTWH3-60-T100-151 * 150:5 T100 0.3 0.3 0.3 0.3 0.3 12900
CTWH3-60-T100-201 * 200:5 T100 0.3 0.3 0.3 0.3 0.3 17200
CTWH3-60-T100-251 * 250:5 T100 0.3 0.3 0.3 0.3 0.3 17200
CTWH3-60-T100-301 * 300:5 T100 0.3 0.3 0.3 0.3 0.3 34500
CTWH3-60-T100-401 * 400:5 T100 0.3 0.3 0.3 0.3 0.3 34500
CTWH3-60-T100-601 * 600:5 T100 0.3 0.3 0.3 0.3 0.3 66200
CTWH3-60-T100-801 * 800:5 T100 0.3 0.3 0.3 0.3 0.3 66200
CTWH3-60-T100-102 * 1000:5 T100 0.3 0.3 0.3 0.3 0.3 66200
CTWH3-60-T100-122 * 1200:5 T100 0.3 0.3 0.3 0.3 0.3 66200
** With a burden of B 0.1 or greater connected to the secondary.
BAR SIZES
PRIMARY CURRENT
DIMENSIONS
A B
5 TO 250A 0.25 1.50
300 TO 1200A 0.38 2.00
113
Current Transformers
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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F
114 Current Transformers
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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F
Medium Voltage Current Transformer
115
Current Transformers
F
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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Medium Voltage Current Transformer
CTWH3-A-60-T90
Applications
High accuracy metering and relaying.
Frequency
50 - 400 Hz.
Maximum System Voltage
5.6kV, BIL 60kV full wave.
Continuous Thermal Current Rating
Factor
1.33 at 30° C amb., 1.0 at 55° C amb.
400:5
1.1 at 30° C amb., 0.85 at 55° C amb.
Primary Terminals
Plated copper bars. See chart for sizes.
Secondary Terminals
Brass screws No. 10-32 with one flatwasher & lockwasher.
Vacuum cast in polyurethane resin.
Other ratios, secondary currents and dual ratios are available.
Refer to factory.
The transformers are tested for partial discharge to Canadian
Standards CAN3-C13-M83. This test can also be carried out to
IEC requirements if requested.
Approximate weight
41 lbs.
Regulatory Agencies
CTWH3-A-60-T90-050 5:5 T90 0.1 0.1 0.1 0.1 0.2 470
CTWH3-A-60-T90-100 10:5 T90 0.1 0.1 0.1 0.1 0.2 900
CTWH3-A-60-T90-150 15:5 T90 0.1 0.1 0.1 0.1 0.2 1700
CTWH3-A-60-T90-200 20:5 T90 0.1 0.1 0.1 0.1 0.2 1920
CTWH3-A-60-T90-250 25:5 T90 0.1 0.1 0.1 0.1 0.2 2600
CTWH3-A-60-T90-300 30:5 T90 0.1 0.1 0.1 0.1 0.2 2900
CTWH3-A-60-T90-400 40:5 T90 0.1 0.1 0.1 0.1 0.2 3700
CTWH3-A-60-T90-500 50:5 T90 0.1 0.1 0.1 0.1 0.2 4700
CTWH3-A-60-T90-750 75:5 T90 0.1 0.1 0.1 0.1 0.2 5800
CTWH3-A-60-T90-101 100:5 T90 0.1 0.1 0.1 0.1 0.2 8600
CTWH3-A-60-T90-151 150:5 T90 0.1 0.1 0.1 0.1 0.2 12900
CTWH3-A-60-T90-201 200:5 T90 0.1 0.1 0.1 0.1 0.2 18000
CTWH3-A-60-T90-301 300:5 T90 0.1 0.1 0.1 0.1 0.2 28200
CTWH3-A-60-T90-401 400:5 T90 0.1 0.1 0.1 0.1 0.2 34000
CTWH3-A-60-T90-601 600:5 T90 0.1 0.1 0.1 0.1 0.2 51500
Catalog Number*
Current
Ratio
Relay
Class B0.1 B0.2 B0.5 B0.9 B1.8
ANSI Metering Class at 60 Hz *Thermal Current Rating 1
second RMS Amps
* With a burden of B 0.1 or greater connected to the secondary.
BAR SIZES
PRIMARY CURRENT
DIMENSIONS
A B
5 TO 250A 0.25 1.50
300 TO 1200A 0.38 2.00
116 Current Transformers
F
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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Medium Voltage Current Transformer
117
Current Transformers
F
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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Medium Voltage Current Transformer
CTW5-L-110 & CTWH5-L-110
Applications
Metering and relaying.
Frequency
50 - 400 Hz.
Maximum System Voltage
15.5kV, BIL 110kV full wave.
Continuous Thermal Current Rating
Factor
1.00 at 30° C amb., 0.85 at 55° C amb.
Primary Terminals
1/2-13 bolts with one Belleville washer.
Secondary Terminals
Brass screws No. 10-32 with one flatwasher & lockwasher.
Vacuum cast in polyurethane resin.
Other ratios, secondary currents and dual ratios are available.
Refer to factory.
The transformers are tested for partial discharge to Canadian
Standards CAN3-C13-M83. This test can also be carried out to
IEC requirements if requested.
Approximate weight
34 lbs.
Regulatory Agencies
Part Number*
Current
Ratio
Relay
Class B0.1 B0.2 B0.5 B0.9 B1.8
ANSI Metering Class at 60 Hz Thermal Current Rating
1 second RMS Amps
CTW5-L-110-T20-050 5:5 T20 0.3 0.3 0.6 1.2 2.4 375
CTW5-L-110-T20-100 10:5 T20 0.3 0.3 0.6 1.2 2.4 590
CTW5-L-110-T20-150 15:5 T20 0.3 0.3 0.6 1.2 2.4 1200
CTW5-L-110-T20-250 25:5 T20 0.3 0.3 0.6 1.2 2.4 1700
CTW5-L-110-T20-300 30:5 T20 0.3 0.3 0.6 1.2 2.4 1700
CTW5-L-110-T20-400 40:5 T20 0.3 0.3 0.6 1.2 2.4 2400
CTW5-L-110-T20-500 50:5 T20 0.3 0.3 0.6 1.2 2.4 4715
CTW5-L-110-T25-750 75:5 T25 0.3 0.3 0.6 1.2 2.4 4715
CTW5-L-110-T25-101 100:5 T25 0.3 0.3 0.6 1.2 2.4 8625
CTW5-L-110-T25-151 150:5 T25 0.3 0.3 0.6 1.2 2.4 11500
CTW5-L-110-T30-201 200:5 T30 0.3 0.3 0.6 1.2 2.4 11500
CTW5-L-110-T20-251 250:5 T20 0.3 0.3 0.6 1.2 2.4 21700
CTW5-L-110-T25-301 300:5 T25 0.3 0.3 0.6 1.2 2.4 21700
CTW5-L-110-T30-401 400:5 T30 0.3 0.3 0.6 1.2 2.4 44700
CTW5-L-110-T35-501 500:5 T35 0.3 0.3 0.3 0.6 1.2 44700
CTW5-L-110-T40-601 600:5 T40 0.3 0.3 0.3 0.6 1.2 44700
CAUTION: Use only the Belleville washers supplied. Tighten to between 25 and 30 foot-pounds. Do not overtighten.
* For ordering with primary bars, change model number to CTWH5-L. A test card is provided with each unit.
BAR SIZES
PRIMARY CURRENT
DIMENSIONS
A B
5 TO 250A 0.25 1.50
300 TO 1200A 0.38 2.00
118 Current Transformers
F
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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Medium Voltage Current Transformer
119
Current Transformers
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3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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Wound Primary Current Transformer
Models 10WP & 189
The Model 10WP is a low ratio wound primary current transformer,
suitable for primary currents up to 40 amperes. The Model 10WP table lists
the most common current ratings. Primary terminals for the Model 10WP
are: for ratios of 25:5 and below, No. 8-32 brass studs with one
flatwasher, lockwasher and regular nut, for ratios of 30:5 and above,
1/4-20 brass studs with one flatwasher, lockwasher and regular nut.
The Model 189 is a low ratio wound primary current transformer suitable
for primary currents up to 100 amperes. The Model 189 table lists the most
common current ratings. Primary terminals for the Model 189: for ratios of
30:5 and below are, No. 10-32 brass screws with one lockwasher
(Dimension A=3.28), for ratios of 40:5 and above, 3/8-16 brass studs with
one lockwasher and regular nut (Dimension A=4.10).
Continuous Thermal Current Rating Factor
1.33 at 30° C amb., 1.0 at 55° C amb.
Frequency• 50 - 400 Hz.
Insulation Level
0.6 kV, BIL 10kV full wave.
Secondary Terminals
Brass studs No. 8-32 UNC with one flatwasher, lockwasher and regular nut.
Approximate weight
Model 10WP: 1.5 lbs.
Model 189: 0.75 lbs.
Regulatory Agencies
10WP-0025 2.5:5 0.6 0.6
10WP-005 5:5 0.6 0.6
10WP-0075 7.5:5 0.6 0.6
10WP-010 10:5 0.6 0.6
10WP-015 15:5 0.6 0.6
10WP-020 20:5 0.6 0.6
10WP-025 25:5 0.6 0.6
10WP-030 30:5 0.6 0.6
10WP-040 40:5 0.6 0.6
Part Number Current Ratio
B0.1 B0.2
ANSI Metering Class at 60 Hz
Part Number Current Ratio
B0.1 B0.2
ANSI Metering Class at 60 Hz
189-0025 2.5:5 0.6 0.6
189-005 5:5 0.6 0.6
189-0075 7.5:5 0.6 0.6
189-010 10:5 0.6 0.6
189-015 15:5 0.6 0.6
189-020 20:5 0.6 0.6
189-025 25:5 0.6 0.6
189-030 30:5 0.6 0.6
189-040 40:5 0.6 0.6
189-050 50:5 0.6 0.6
189-060 60:5 0.6 0.6
189-075 75:5 0.6 0.6
189-080 80:5 0.6 0.6
189-101 100:5 0.6 0.6
Model 10WP
Model 189
Model 189
Model 10WP
120 Current Transformers
F
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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Notes About Current Transformers
121
Potential Transformers
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Potential Transformers
CR Magnetics carries an extensive line of Potential Transformers that are used to monitor and measure various
levels of AC voltages. Typically modeled similarly to common power transformers, potential transformers are specially
designed to provide accurate input versus output curves over a wide range of loading. Whereas power transformers
are typically designed for 70 to 80 percent regulation, potential transformers are designed for 99% or better
regulation.
The 467, 468, and 460 Series of voltage transformers are designed to give
accurate measurement of low voltage systems (up to 600 VAC) by stepping down
higher voltages to 120 VAC. Useful for monitoring and measuring incoming
building or factory voltages.
The 3PT-1-45 and PT3-2-45 Series of potential transformers are designed
to give accurate measurement of medium voltage systems up to 5KV by stepping
down higher voltages to 120 VAC. Useful for monitoring and measuring larger
power systems and distribution networks containing medium voltage loads.
The PTW3-1-60 Series of potential transformers are designed to give accurate
measurement of medium voltage systems up to 5KV by stepping down higher
voltages to 120 VAC. Useful for monitoring and measuring larger power systems
and distribution networks containing medium voltage loads. These devices
have increased capability to drive larger VA loads.
Contact CR Magnetics for other styles of potential transformers including
medium voltage units up to 32K VAC, as well as custom designs tailored to fit the
specific accuracy and energy capability required by any application.
Potential Transformers
Voltage Transformer Groups
122
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Group 1. Transformers for application with 100% of rated primary voltage connected to the primary terminals either line-to-line or line-to-ground.
These transformers are capable of operating at 125% of rated volts in emergency conditions, but cannot exceed 65% of their thermal burden
rating, with a limit of 75°C. temperature rise. This will result in a reduced life expectancy. Consult the factory for details. continuous operation
at 110% of rated voltage is permissible, provided that the thermal burden rated volt - amperage is not exceeded.
Group 2. Transformers are for line-to-line connection, but may be connected line-to-neutral at a voltage of the rated line volts divided by the
square root of three. continuous operation at 110% of rated voltage is permissible, provided that the thermal burden rated voltamperes
is not exceeded.
Rated Primary Voltage
for Rated System Voltage
Line-to-Line
Turns
Ratio
Basic Impulse Insulation
Level (kV Crest)
840 1455Y* 7:1 10
840 1455Y* 10:1 10
840 1455Y* 20:1 10
840 1455Y* 35:1 10
840 1455Y* 40:1 10
Rated Primary Voltage
for Rated System
Voltage Line-to-Line
Turns
Ratio
Basic Impulse Insulation
Level (kV Crest)
7200 for 12470Y 1:1 10
8400 for 14560Y 1:1 10
12000 for 20785Y 1:1 10
14400 for 24940Y 1:1 10
Rated Primary Voltage
for Rated System
Voltage Line-to-Line
Turns
Ratio
Basic Impulse Insulation
Level (kV Crest)
2400 for 2400Y 20:1 45
3300 for 3300Y* 30:1 60 or 45
4200 for 4200Y* 35:1 60 or 45
4800 for 4800Y 40:1 60 or 45
7200 for 7200Y 60:1 75 or 110
8400 for 8400Y* 70:1 75 or 110
11000 for 11000Y 100:1 95 or 110
Rated Primary Voltage
for Rated System
Voltage Line-to-Line
Turns
Ratio
Basic Impulse Insulation
Level (kV Crest)
12000 for 12000Y 100:1 95 or 110
13200 for 13200Y 110:1 95 or 110
14400 for 14400Y 120:1 95 or 110
18000 for 18000Y* 150:1 125*
21000 for 21000Y* 175:1 125*
24000 for 24000Y 200:1 125 or 150
27600 for 27600Y* 240:1 150 or 200
34500 for 34500Y 300:1 150 or 200
Group 4.
Transformers are for line-to-ground connection, indoors only. The neutral terminal is insulated to withstand a test voltage of 10kV.
They may be continuously operated at 110% of rated voltage, provided that the thermal burden rated volt-amperes is not exceeded.
Group 4A transformers are capable of operating at 125% of rated volts in emergency conditions, but cannot exceed 65% of their
thermal burden rating, with a limit of 75°C. temperature rise. This will result in a reduced life expectancy. Consult the factory for
details.
Rated Primary Voltage
for Rated System Voltage
Line-to-Line
Turns
Ratio
Basic Impulse Insulation
Level (kV Crest)
2400 for 4160 GND Y 20:1 65 or 45*
4200 for 7200 GND Y 35:1 75
4800 for 8320 GND Y 40:1 75
7200 for 12470 Y 60:1 110
8400 for 14560 GND Y 70:1 110
Group 4A for Operation at 100% Rated Voltage
Rated Primary Voltage for
Rated System Voltage
Line-to-Line
Turns
Ratio
Basic Impulse Insulation
Level (kV Crest)
4200 for 4160 GND Y 35:1 65 or 45
4800 for 4800 GND Y 40:1 65 or 45
7200 for 7200 GND Y 60:1 75
8400 for 8400 GND Y 70:1 75
11000 for 11000 GND Y 100:1 110
12000 for 12000 GND Y 100:1 110
13200 for 13200 GND Y 110:1 110
14400 for 14400 GND Y 120:1 110
Group 4B for Operation at 58% Rated Voltage
* Not recognized in ANSI/IEEE C57.13
NOTE: Voltage Transformers connected line-to-ground on an ungrounded system cannot be considered to be grounding transformers and must be
operated with the secondaries in closed delta because excessive currents may flow in the delta. For further details see ANSI/IEEE C57.13
G
123
Potential Transformers
G
Application Notes
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1. Delta Connected Supply Systems
When applying voltage transformers to ungrounded delta connected supply systems, the transformer must not be connected in wye with the wye-point connected
to neutral ground, or ungrounded. The advent of zero sequence currents caused by a ground fault in the system will cause damage, and eventual
destruction of the transformer if the fault is not quickly removed.
2. Ferro resonance
Most voltage transformers are lightly loaded, particularly when associated with watthour metering and relaying schemes. If the voltage transformer has one
primary lead grounded, and during an abnormal condition creating a large overvoltage, the transformer may saturate, and its impedance may cause a resonance
with the system capacitance. This resonance, or oscillation, may be sustained and could destroy the voltage transformer. If, however, the secondaries
are connected in delta, with a broken arrow, and a suitable resistor is connected across the broken corner, then ferro resonance can be damped. Our recommendation
for the resistive value is shown on the catalog sheet where it applies. The power rating is determined by the user.
3. Secondary Circuit Check
Immediately prior to connecting the burden and leads to the transformer, a check of the impedance at that circuit should be made. This will avoid a possible
short-circuit connection to the transformer, if a short-circuit is applied to the transformer, it can be withstood for one second. Note: Only secondary circuit
fuses can adequately protect the transformer from such a short circuit.
4. Primary Fuse Rating
Values shown are suggested for normal installations, in order to protect the system from a voltage transformer failure. Higher ratings at users option, may
be used to avoid unusual clearing due to conditions resulting from magnetizing in-rush.
ROUTINE FACTORY TESTS
VOLTAGE
CLASS
NO. OF BUSHINGS CONNECTION
LV 1 MIN
60Hz
H2 1 MIN
60Hz
HV 1 MIN
60Hz
INDUCED
18 SEC. 400Hz
5kV
1 L - GND N 2.5kV 10 kV NA 15kV OR 19kV
2 L - L 2.5kV NA 15kV OR 19kV DOUBLE VOLTAGE
8.7kV
1 L - GND N 2.5kV 10 kV NA 26kV
2 L - L 2.5kV NA 26kV DOUBLE VOLTAGE
15kV
1 L - GND N 2.5kV 10 kV NA 34 kV
2 L - L 2.5kV NA 34kV OR 36kV DOUBLE VOLTAGE
25kV
1 L - GND N 2.5kV 10 kV NA kV
2 L - L 2.5kV NA kV DOUBLE VOLTAGE
34.5kV
1 L - GND N 2.5kV 10 kV NA 70 kV
2 L - L 2.5kV NA 70kV OR 80kV DOUBLE VOLTAGE
Routine Factory Tests include: Polarity, accuracy, and partial discharge per CANADIAN STANDARDS (CAN3-C13-M83) (Partial discharge can also be carried out to IEC
requirements on request)
ANSI BURDEN DATA
CONNECTION VA POWER FACTOR ANGLE
W 12.5 0.10 84.3°
X 25 0.70 45.6°
M 35 0.20 78.5°
Y 75 0.85 31.8°
Z 200 0.85 31.8°
ZZ 400 0.85 31.8°
124 Potential Transformers
G
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467 Voltage Transformers
Frequency
60 Hz.
*Models designed specifically for 50 hz operations are
available with reduced performance. Contact factory for
details
Standard Secondary Voltage:
120 Volts
Use with CR Magnetics Transducers
Insulation Level:
600 Volt, 10 kV BIL full wave
Accuracy Class:
+/- 1% at all burdens up to 5 vA at 1.0 and 0.95 P.F.
Thermal Rating:
40 VA at 30° C . amb., 27 VA at 55°C. amb
Terminals are No. 6-32 screws with one lockwasher and
one flatwasher.
Approximate weight 2.5 lbs.
Regulatory Agencies:
The 467 Series of voltage transformers are designed to give
accurate measurement of low voltage systems (up to 600 VAC) by
stepping down higher voltages to 120 VAC. Useful for monitoring
and measuring incoming building or factory voltages.
PART NUMBERS
Part Number Voltage Rating Turns Ratio Rec. Primary
Fuse Rating
467-069 69.3:120 0.58:1 1.5
467-120 120:120 1:1 1.0
467-208 208:120 1.73:1 0.5
467-240 240:120 2:1 0.5
467-277 277:120 2.31:1 0.5
467-288 288:120 2.4:1 0.4
467-300 300:120 2.5:1 0.4
467-346 346:120 2.88:1 0.4
*467-480 *480:120 4:1 0.25
*467-600 *600:120 5:1 0.25
3.78
0.65
1.69
3.00
3.06
X2 X1 3.50
H2 H1
(4) 0.17 X 0.31 SLOTS
0.22
467
E93779
LR89403
Manufactured to meet the
requirements of ANSI/IEEE C57.13
125
Potential Transformers
G
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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468 Potential Transformers
The 468 Series of potential transformers are designed to give
accurate measurement of low voltage systems (up to 600 VAC) by
stepping down higher voltages to 110 VAC. Useful for monitoring
and measuring incoming building or factory voltages.
468
PART NUMBERS
Part Number Voltage Rating Turns Ratio Rec. Primary
Fuse Rating
468-069 69.3:120 0.58:1 3.0
468-120 120:120 1:1 2.0
468-208 208:120 1.73:1 1.0
468-240 240:120 2:1 1.0
468-277 277:120 2.31:1 1.0
468-288 288:120 2.4:1 0.75
468-300 300:120 2.5:1 0.75
468-346 346:120 2.88:1 0.75
*468-480 *480:120 4:1 0.50
*468-600 *600:120 5:1 0.40
19.05
.75
33.27
1.31
55.63
2.19
71.37
LABEL 2.81
H2 H1
X1 X2
35.05
1.38
76.20
3.00
92.20
3.63
(4) HOLES
5.59
.22
DIA.
28.58
1.13
93.47
3.68
103.12
4.06
9.65
.38
(2) BOSSES
3/8 DIA.
E93779
LR89403
Manufactured to meet the
requirements of ANSI/IEEE C57.13
Frequency
60 Hz.
*Models designed specifically for 50 hz operations are
available with reduced performance. Contact factory for
details
Standard Secondary Voltage:
120 Volts
Use with CR Magnetics Transducers
Insulation Level:
600 Volt, 10 kV BIL full wave
Accuracy Class:
+/- 0.6% at all burdens up to 7.5 VA at 1.0 and +/- 1.5%
20 VA burden
Thermal Rating:
75 VA at 30° C . amb., 50 VA at 55°C. amb
Terminals are No. 10-32 screws with one lockwasher and
one flatwasher.
Approximate weight 4 lbs.
Regulatory Agencies:
126
G
460 Voltage Transformers
The 460 Series of Voltage transformers are designed to give
accurate measurement of low voltage systems (up to 600 VAC) by
stepping down higher voltages to 110 VAC. Useful for monitoring
and measuring incoming building or factory voltages.
H2 H1
X1 X2
31.75
1.25
56.64
2.23
101.60
4.00
120.14
LABEL 4.73
59.69
2.35
95.25
3.75
114.05
4.49
(2) BOSSES
0.38
12.70
.50
73.15
2.88
84.84
3.34
107.44
23.62 4.23
.93
(4) HOLES
10.92
.43
PART NUMBERS
Part Number Voltage Rating Turns Ratio Rec. Primary
Fuse Rating
460-069 69.3:120 0.58:1 5.0
460-120 120:120 1:1 4.0
460-208 208:120 1.73:1 2.0
460-240 240:120 2:1 2.0
460-277 277:120 2.31:1 2.0
460-288 288:120 2.4:1 1.5
460-300 300:120 2.5:1 1.5
460-346 346:120 2.88:1 1.5
*460-480 *480:120 4:1 1.0
*460-600 *600:120 5:1 0.75
460
Potential Transformers
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E93779
LR89403
Manufactured to meet the
requirements of ANSI/IEEE C57.13
Frequency
60 Hz.
*Models designed specifically for 50 hz operations are
available with reduced performance. Contact factory for
details
Standard Secondary Voltage:
120 Volts
Use with CR Magnetics Transducers
Insulation Level:
600 Volt, 10 kV BIL full wave
Accuracy Class:
0.6 W, 1.2 X at 60 Hz.
Thermal Rating:
150 VA at 30° C . amb., 100 VA at 55°C. amb
Terminals are No. 10-32 screws with one lockwasher and
one flatwasher.
Approximate weight 7.75 lbs.
Regulatory Agencies:
127
Potential Transformers
G
PT3-1-45 and PT3-2-45
The PT3-1-45 and PT3-2-45 Series of potential transformers are designed to
give accurate measurement of medium voltage systems up to 5KV by stepping down
higher voltages to 120 VAC. Useful for monitoring and measuring larger power systems
and distribution networks containing medium voltage loads.
TWO BUSHING (a) CATALOG NUMBERS
GROUP
PRIMARY
VOLTAGE
RATIO
SECONDARY
VOLTAGE
UNFUSED FUSES FUSE CLIPS ONLY (d) SWITCHGEAR STYLE
1 840 7:1 120 PT3-2-45-841 PT3-2-45-841FF PT3-2-45-841CC PT3-2-45-841SS
1 1200 10:1 120 PT3-2-45-122 PT3-2-45-122FF PT3-2-45-122CC PT3-2-45-122SS
1 2400 20:1 120 PT3-2-45-242 PT3-2-45-242FF PT3-2-45-242CC PT3-2-45-242SS
2 3300 30:1 110-50Hz PT3-2-45-332 PT3-2-45-332FF -----PT3-2-45-332CC PT3-2-45-332SS
2 4200 35:1 120 PT3-2-45-422 PT3-2-45-422FF PT3-2-45-422CC PT3-2-45-422SS
2 4800 40:1 120 PT3-2-45-482 PT3-2-45-482FF PT3-2-45-482CC PT3-2-45-482SS
One Bushing (b) CATALOG NUMBERS
GROUP
PRIMARY
VOLTAGE
RATIO
SECONDARY
VOLTAGE
R FR
(c) FUSES FUSE CLIPS ONLY (d) SWITCHGEAR STYLE
4A 2400 20:1 120 190 PT3-1-45-242F PT3-1-45-242C PT3-1-45-242S
4B 4200 35:1 120 190 PT3-1-45-422F PT3-1-45-422C PT3-1-45-422S
AB 4800 40:1 120 190 PT3-1-45-482F PT3-1-45-482C PT3-1-45-482S
PART NUMBERS
UNFUSED
TWO BUSHING
ONE FUSE
ONE BUSHING
TWO FUSE
TWO BUSHING
H1
X2
X1 X2 X1 X2
X1
H1
H1 H2
H2
H2
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E145172
LR89403
Manufactured to meet the
requirements of ANSI/IEEE C57.13
Frequency
60 Hz.
Maximum System Voltage:
5.6kV, BIL 45kV.
Use with CR Magnetics Transducers
Accuracy Class:
0.3 WX, 0.6 MY,1,2Z at 100% rated voltage with 120V
based ANSI Burden
0.6 WX, 1.2 MY at 58% rated voltage with 69.3V based
on ANSI burden
Thermal Rating:
600 VA at 30° C . amb., 400 VA at 55°C. amb
Switch gear style is similar to fused style. No fuse or Fuse
clip is provided, but inserts for fuse clips are supplied.
Approximate weight 20 lbs., unfused
Regulatory Agencies:
128
G
PT3-1-45 and PT3-2-45
•
•
•
FUSE FOR MODEL
PT3
TRANSFORMER
RATING
VOLTS
INTERRUPTING
AMPERES (SYM)
SUGGESTED
RATING
CONTINUOUS
AMPERES
CAP DIA .
INCHES
(a)
LENGTH
INCHES
CLIP CENTERS
INCHES
2400:120V 5.5kV 45,000 2.0E 1.0 5.63 5.00
3300:110V 5.5kV 45,000 2.0E 1.0 5.63 5.00
4200:120V 5.5kV 45,000 1.0E 1.0 5.63 5.00
4800:120V 5.5kV 45,000 1.0E 1.0 5.63 5.00
(a)
(b)
(c) Value s in table are in iohms.
(d) Fuse clips noted as "CC or "C" accept fuses with 1.0" Dia. caps and 5" centers. Fuses clips with a suffix "CCS" or "CS" accept fuses with 0.81 in. caps and 5 in.
clip centers
RECOMMENDED MINIMUM SPACINGS
A = Unit to Unit = 0.75” m inimum.
B = HV to Ground in air = 3.00” m inimum.
User needs to set appropriate values to assure
performance for high potent ial tes t , impulse tes t ,
high humidity, part ial discharge, high alt itude, and
other considerat ions like configurat ion.
UNFUSED ONE FUSE TWO FUSE
CIRCLE DIAGRAM
Two fuse transformers should not be used for Y connections. It is preferred practice to connect one lead from each voltage transformer directly to the neutral terminal,
using a fuse int he line side of the primary only. By using this connection a transformer can never be made "live"from the side by reason of a blown fuse in the neutral
side. For continuous operation the transformer primary voltage should not exceed 110% of rated value.
Voltage transformers connected line-to-ground cannot be considered to be grounding transformers and must not be operated with the secondaries in closed delta
because excessive currents may flow in the delta.
Note: It is recommended that system line-to-line voltage not exceed the transformer maximum system voltage level.
Primary terminals that are unfused are 1/4-20 brass screws with one flatwasher
and lockwasher.
Primary terminals that are fused are 1/4-20 brass screws with one flatwasher
and lockwasher and two nuts.
Secondary terminals are No. 10-32 brass screws with one flatwasher and
lockwasher.
Recommended spacing are for guidance only
The circle diagram can be used to predict the performance of a transformer
for various loads and power factors. A convenient scale of volt-ampere is
shown on the unity power line (u.p.f.) and commences at the zero or
no-load locus. To use the diagram, measure the known V.A. and scribe an arc
about the "Zero" locus of a length that contains the angle of the burden
power factor. The point at which the arc terminates is the error locus in phase
angle minutes and ratio correction factor.
Potential Transformers
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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129
Potential Transformers
G
PTW3-1-60
The PTW3-1-60 Series of potential transformers are designed to give accurate
measurement of medium voltage systems up to 5KV by stepping down higher voltages
to 120 VAC. Useful for monitoring and measuring larger power systems and distribution
networks containing medium voltage loads. These devices have increased capability
to drive larger VA loads.
TWO BUSHING (a) CATALOG NUMBERS
GROUP
PRIMARY
VOLTAGE
RATIO
SECONDARY
VOLTAGE
UNFUSED FUSES FUSE CLIPS ONLY (d) SWITCHGEAR STYLE
1 *2400 20:1 120 PTW3-2-60-242 PTW3-2-60-242FF PTW3-2-60-242CCSorCCL PTW3-2-60-242SS
2 3300 30:1 110-50Hz PTW3-2-60-332 PTW3-2-60-332FF PTW3-2-60-332CCSorCCL PTW3-2-60-332SS
2 4200 35:1 120 PTW3-2-60-422 PTW3-2-60-422FF PTW3-2-60-422CCSorCCL PTW3-2-60-422SS
2 *4800 40:1 120 PTW3-2-60-482 PTW3-2-60-482FF PTW3-2-60-482CCSorCCL PTW3-2-60-482SS
One Bushing (b) CATALOG NUMBERS
GROUP
PRIMARY
VOLTAGE
RATIO
SECONDARY
VOLTAGE
R FR
(c) FUSES FUSE CLIPS ONLY (d) SWITCHGEAR STYLE
4A *2400 20:1 120 230 PTW3-1-60-242F PTW3-1-60-242CSorCL PTW3-1-60-242S
4B *4200 35:1 120 230 PTW3-1-60-422F PTW3-1-60-422CSorCL PTW3-1-60-422S
4B *4800 40:1 120 230 PTW3-1-60-482F PTW3-1-60-482CSorCL PTW3-1-60-482S
PART NUMBERS
UNFUSED
TWO BUSHING
ONE FUSE
ONE BUSHING
TWO FUSE
TWO BUSHING
H1
X2
X1 X2 X1 X2
X1
H1
H1 H2
H2
H2
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
Web: 緯軒工業。歡迎咨詢 E-mail: 緯軒工業。歡迎咨詢
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Company
ISO 9001:2008 Quality Management System
M N TI
E145172
LR89403
Manufactured to meet the
requirements of ANSI/IEEE C57.13
Frequency
60 Hz.
Maximum System Voltage:
5.6kv, BIL 60kV.
Use with CR Magnetics Transducers
Accuracy Class:
0.3 WXMY, 1.2 Z at 100% rated voltage with 120V based
ANSI Burden
0.6 WX, 1.2 MY at 58% rated voltage with 69.3V based
on ANSI burden
Thermal Rating:
750 VA at 30° C . amb., 500 VA at 55°C. amb
Approximate weight 34 lbs., unfused
Regulatory Agency:
130
PTW3-1-60
G
• Primary terminals that are unfused are 1/4-20 brass screws with one flatwasher
and lock washer.
• Primary terminals that are fused are 1/4-20 brass screws with one flatwasher
and lock washer and two nuts.
• Secondary terminals are No. 10-32 brass screws with one flatwasher and
lock washer.
• The core and coil assembly is encased in a plastic enclosure and vacuum
encapsulated in polyurethane resin.
• Thermal burden rating is for 120 volt secondaries.
• Switch gear style is similar to fused style. No fuse or fuse clip is provide, but
inserts for fuse clips are supplied.
FUSE FOR MODEL
PT W3 TRANSFORMER
RATING
VOLTS
INTERRUPTING
AMPERES (SYM)
SUGGESTED
RATING
CONTINUOUS
AMPERES
CAP DIA.
INCHES
(d)
LENGTH
INCHES
CLIP CENTERS
INCHES
2400:120V 5.5kV 45,000 2.0E 1.0 5.63 5.00
3300:110V 5.5kV 45,000 2.0E 1.0 5.63 5.00
4200:120V 5.5kV 45,000 1.0E 1.0 5.63 5.00
4800:120V 5.5kV 45,000 1.0E 1.0 5.63 5.00
(a) Two fuse transformers should not be used for Y connections. It is preferred practice to connect one lead from each voltage transformer directly to the neutral terminal, using a
fuse in the line side of the primary only. By using this connection a transformer can never be made “live” from the line side by reason of a blown fuse in the neutral side. For continuous
operation the transformer primary voltage should not exceed 110% of rated value.
(b) Voltage transformers connected line-to-ground cannot be considered to be grounding transformers and must not be operated with the secondaries in closed delta because
excessive currents may flow in the delta.
(c) Values in table are in ohms.
(d) Fuse clips noted as “CCS” or “CS” accept fuses with 1.0” Dia. caps and 5” clip centers. Fuses clips with a suffix“CCL” or “CL” accept fuses with 1.63 dia. caps and 5.88” clip centers.
Note: It is recommended that system line-to-line voltage not exceed the transformer maximum system voltage level.
UNFUSED ONE FUSE TWO FUSE
The circle diagram can be used to predict the performance of a transformer
for various loads and power factors. A convenient scale of volt-ampere is
shown on the unity power factor line (u.p.f ) and commences at the zero or
no-load locus. To use the diagram, measure the known V.A . and scribe an arc
about the “Zer o ” locus of a length that contains the angle of the burden
power factor. The point at which the arc terminates is the error locus in phase
angle minutes and ratio correction factor.
CIRCLE DIAGRAM
RECOMMENDED MINIMUM SPACINGS
A = Unit to Unit or to Ground = 1.00” minimum.
B = HV to Ground in air = 3.00” minimum.
Recommended spacing are for guidance only. User needs to set
appropriate values to assure performance for high potential test,
impulse test, high humidity, partial discharge, high altitude, and other
considerations like configuration.
Potential Transformers
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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Contents Listing
131
Applications
H
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The Technical Reference documents contain handy lookup information
on 3 phase and single phase power systems, Ohm’s law, and
mathematical models of sensors.
The Application Guides are basic applications and design notes
for using electrical properties instrumentation products. Included are
typical applications of parts, adjusting and understanding transfer functions
of sensors and transducers, and design aids and applications to
implement full systems.
Applications, Guides, and References
As part of our commitment to customer service, the following pages contain some of the most common
application notes, as well as some handy reference material that makes implementing your own instrumentation
system easy and fast. All our information is also available for download at
www.crmagnetics.com
P
P I R
E R
E2
R
E2
P P
I2
P
I
I2R
EI
IR
E
R
E
I
P
E
PR
A
C B
120 (240) [480]
120 (240) [480]
120 (240) [480]
Applications
132
H
Applications
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
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All CR Magnetics applications and reference material can be found online
www.crmagnetics.com
Just type in crmagnetics.com, and go to the Technical Guides Button!!
www
PAGE 133 Developing voltages from 4 to 20 mA Current Loops
PAGE 134 Using the CR4210/11 Self Powered Current Transducer
PAGE 135 Measuring 3 Phase Currents with the CR4210/11 Transducer
PAGE 136 Using the CR4220/60 Loop Powered Current Transducer
PAGE 137 3 Phase 3 Wire Active Power Measurement using the CR6230/40 Power Transducer
PAGE 138 3 Phase 4 Wire Active Power Measurement using the CR6250/60 Power Transducer
PAGE 139 Motor Current Monitoring using the CR4395 Current Sensing Relay
PAGE 140 Detecting Open Heaters and Lamps using the CR4395 Current Sensing Relay
PAGE 141 3 Phase Imbalance and Ground Fault Detection using the CR7310 Ground Fault Sensor
PAGE 142 The CR45 as an Open Heater/Open Winding Indicator
PAGE 143 Field Adjustment of Current Transformer Ratio
PAGE 144 Selecting Revenue ANSI Class Metering Current Transformers
PAGE 145 Using Auxiliary Current Transformers with Other CR Devices
PAGE 146 Precision Rectifier Circuit for Current Transformer Signal Conditioning
PAGE 147 Low Cost Fan Control with Hysteresis
PAGE 148 Index of Common Terms used in the Electrical Measurement Industry
PAGE 152 Users Guide Concerning Errors in CT Ratio
PAGE 154 Table Listing Electrical Operating and Full Load Current of various HP Motors
PAGE 154 Commonly Used Voltages and Power Supplies for the United States
PAGE 155 Illustration of 3 Phase Circuits with Loads and Currents Calculated
PAGE 156 Flow / Wave Soldering Specification
PAGE 157 OHM’S LAW for DC and AC Circuits
PAGE 158 Listing of Books, Standards, and Articles Relating to Electrical Properties Measurement
Developing Voltage From 4-20mA Current Loops
133
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Applications
H
Many of the Analog Transducers from CR Magnetics provide a 4 to 20mA current loop to communicate sensed values.
These loops can be converted to a voltage for input to a wide variety of instrumentation devices including panel
meters, data acquisition systems, and programmable controllers. By adding a precision resistor in series with the
loop, a voltage is developed, which can then be inputted to the instrumentation. In the diagram below, a current
transducer is used to show this concept.
The tolerance of the resistor is critical. Tolerances of the system are additive – using a 0.5% percent transducer in
conjunction with a 1% resistor results in a 1.5% tolerance system.
The temperature coefficient of the resistor is a key factor. All electronic devices exhibit some variance with
temperature. If the resistor has a large variance with temperature, the accuracy of the system will also vary with
temperature. Self-heating of the resistor must also be considered. A typical design of 5VDC at full scale (20mA)
requires a nominal resistance of 250 Ohms (5/.020). The power generated in this resistor at full scale is Volts
times Amps or 5 X .020 = .100 Watts. Choosing a 1/8 Watt (.125) resistor will provide reasonable safety against
destruction, but will cause a significant temperature rise in the resistor. This rise in temperature can result in
significant changes in the value of the resistance. For instrumentation, a resistor with a power rating of at least
10 times the expected full scale power is recommended.
The resistor should be mounted as close as possible to the instrumentation. Once the signal is converted from
current to voltage, voltage drops from wire resistance introduces errors in the signal.
Whenever possible, use similar materials for all wire connections. Galvanic reactions from dissimilar metals can
introduce errors in the readings. An extremely low galvanic reaction such as 5mV introduces a .1% error at 5VDC
full scale. Smaller reading levels results in this error being more significant.
Using the Self Powered CR4210/11 Series Current Transducer
134
H
Applications
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TOTAL LOAD RESISTANCE
0-10 Vdc for
CR4211
INSTRUMENTATION
RESISTANCE
INTERCONNECT
RESISTANCE
+ -
0-5 Vdc for
CR4210
I PRIMARY
The 4210 and 4211 series transducers are self-powered variable voltage devices that automatically adjust their DC
voltage output to maintain a DC voltage that is proportional to the Average RMS Value of the AC current flowing
through the window of the transmitter. The 4210 outputs 5VDC and the 4211 outputs 10VDC for full scale AC input
current.
Verify that the correct polarity is observed as shown. The 4210/11 series are polarity protected, so damage
should not occur if connected in reverse polarity.
Insure that the total loop resistance (instrument plus wire) exceeds the minimum load resistance for the range
chosen. Most commonly, an instrument with a burden of 1 Meg ohms is chosen. If the total loop resistance
is less than required, the transducer will not function according to published specifications.
Twisted pair wire should be adequate for most applications but shielded/twisted pair wire with the shield
grounded at the instrumentation end may be required for the most severe environments. Refer to the
instrumentation installation manual for more details regarding interconnect requirements.
The output is calibrated to be proportional to the Average RMS of the current primary at 60 Hz. Signals from
devices such as SCR and variable speed drives will not produce an accurate indication of RMS current levels.
The first step in troubleshooting would be to check the voltage across all of the components in the loop.
Transducers may be mounted in close proximity to each other without concern for magnetic interaction.
An external current transformer may be attached to the transducer for applications that require monitoring
current levels above 200 AAC.
Measuring 3-Phase Currents with the CR4210 Transducer
135
Applications
H
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The unique design of the CR4210 Transducer allows the system designer to not only measure individual phase currents,
but also combine signals to realize arithmetic functions with a minimum of components and programming.
Because of the self-powered floating output feature, voltages can be added and subtracted by simple wiring, and
accurate data displayed via programmable scale displays.
Accurate average three phase current measurement
Phase imbalance indication Monitor motor load status accurately and simply
Monitor heater status and balance
Phase Voltage monitor
The transducer function of giving DC output voltages for AC input currents loses all phasing information.
Absolute values of current are available only.
Loading limits of the transducer remain as specified. Multiple transducers wired as shown must be capable of
handling the instrument impedance on an individual basis.
Transducers may be mounted in close proximity to each other without concern for magnetic interaction.
An external current transformer may be attached to the transducer for applications that require monitoring
current levels above 200 AAC.
CR4210/11
Using the CR4220/60 Series Current Transmitter
136
H
+ -
0 to 600 ohms
I PRIMARY
I LOOP = X 16
24 Vdc
+ 4 FS
INTERCONNECT
RESISTANCE
INSTRUMENTATION
RESISTANCE
I PRIMARY I LOOP
The 4220/60 series are variable resistance devices that automatically adjust their DC series resistance to maintain a
DC current that is proportional to the Average RMS Value of the AC current flowing through the window of the transmitter.
Since these are variable resistance devices, the 4-20mA loop must derive power from an external DC power
supply.
Verify that the correct polarity is observed as shown. The 4220/60 series are polarity protected, so damage
should not occur if connected in reverse polarity.
Insure that the total loop resistance (instrument plus wire) does not exceed 600 Ohms. Most commonly, an
instrument with a burden of 250 Ohms is chosen. If the total loop resistance is greater that 600 Ohms the
transducer will not function according to published specifications.
Choosing connection wire with 22 gauge conductors or larger will minimize connection resistance on most
applications. Twisted pair wire should be adequate for most applications but shielded/twisted pair wire with the
shield grounded at the instrumentation end may be required for the most severe environments. Refer to the
instrumentation installation manual for more details regarding interconnect requirements.
Verify that the output of the DC supply is at least 24 VDC, with a current rating of 20 ma or greater per
transmitter connected.
The output is calibrated to be proportional to the Average RMS of the current primary at 60 Hz. Signals from
devices such as SCR and variable speed drives will not produce an accurate indication of RMS current levels.
Multiple loop powered transducers may be attached to the same power supply. Attach one side of the power
supply common to all the transducers.
The first step in troubleshooting would be to check the voltage across all of the components in the loop. At no
load the voltage across the instrumentation will be its burden resistance times .004.
Transducers may be mounted in close proximity to each other without concern for magnetic interaction.
An external current transformer may be attached to the transducer for applications that require monitoring
current levels above 400 AAC.
Applications
3500 Scarlet Oak Blvd. St. Louis MO USA 63122 V: 636-343-8518 F: 636-343-5119
Web: 緯軒工業。歡迎咨詢 E-mail: 緯軒工業。歡迎咨詢
The Professional
Energy Monitoring
Company
ISO 9001:2008 Quality Management System
M N TI
Active Power Measurement with the CR6230/40 Power Transducer
137
Applications
H
The CR6230 and CR6240 series of Power Transducers gives the designer a simple and effective way to measure
and record the instantaneous power usage for 3 – phase 3 – wire loads. These devices are also known as 2
element power transducers. Only two current inputs are needed because 3 – wire power systems do not have a
neutral return path, and one of the lines can always be modeled as the sum of the other two. Hence, these Delta
connections can be measured with 2 current sense points.
Calculation of full scale output: Using a CR6230-500-5 for example, the unit is calibrated to output
the fullscale reading when a balanced purely resistive load is being powered by 500 Vrms line to line, and
the amount of current draw on each leg is 5 Arms. Power in any one leg will be the volts across the leg
times the current through the leg times the power factor. For calibration, the value of the power factor is
unity (1) for a purely resistive load. For the above diagram, the voltage across the element is V L-L, or
500Vrms. The current is Ip, which for balanced loads is I line divided by the square root of 3 (1.732). Thus,
the power in one of the legs for a full scale reading using a 500-5 unit would be 500 X 5/1.732 = 1,443
Watts. There are then 3 legs on a 3-phase line, so the total power, full scale would be 3 X 1,445 = 4,330
Watts. The 500-5 transducer will output fullscale (5VDC or 20mA) when the power being used is 4,330
Watts. Using this same methodology, the following simplified formula will give the full scale reading from
any Delta transducer: Part number CR6230 – AAA - BB, Full scale in Watts = AAA X BB X 3 X 1.732.
External current transformers and voltage transformers can be used to extend the reading range
of any transducer. Voltage and current transformers are sized according to turns ratio. A turns ratio on a
current transformer of 100:5 represents a turns ratio of 100/5 or 20. Thus for every 1 amp from the
current transformer, this represents 20 Amps in the measured line. Since power = V X I X PF (power factor),
the amount of power measured when using external current and voltage transformers will be V X I X PF X
current ratio X voltage ratio. Using our same example as before, with a CR6230-500-5, if an external
current transformer with a ratio of 20 is used, as well as an external voltage transformer with a ratio of 2,
then the new full scale output of the transducer will equal 4,330 X 20 X 2 = 173,200 Watts!!! A simplified
formula for this situation is: Full Scale Watts = AAA X BB X 3 X 1.732 X CT ratio X VT ratio.
Please refer to “Selecting ANSI Class Metering Current Transformers” and “Using External Current Transformers
with Other CR Devices” for more information on transformer ratios and applying external transformers to
transducers and other devices.
