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DONGYANG F&C 氫氧化鈉自動閥
BDD-1000S BDD-1100S BDD-1200S BDD-1300S BDD-1400S BDD-1500S
BDD-2000S BDD-2100S BDD-2200S BDD-2300S BDD-2400S BDD-2500S
BDD-3000S BDD-3100S BDD-3200S BDD-3300S BDD-3400S BDD-3500S
BDD-1010S BDD-1110S BDD-1210S BDD-1310S BDD-1410S BDD-1510S
BDD-2010S BDD-2110S BDD-2210S BDD-2310S BDD-2410S BDD-2510S
BDD-3010S BDD-3110S BDD-3210S BDD-3310S BDD-3410S BDD-3510S
除了能完成和分?jǐn)嚯娐吠猓心軐﹄娐坊螂姎庠O(shè)備發(fā)生的短路．嚴(yán)重過載及欠電壓等進(jìn)行保護，同時也可以用于不地啟動電動機。如圖：空氣開關(guān)總跳閘有三種情況:一是負(fù)荷過大，可以換負(fù)荷大點的空開.二是線路哪里有問題，有線路接地了，或者線路碰頭了，這需要人士檢修了。 3、使用效果無刷電機：通常是數(shù)字變頻控制，可控性強，從每分鐘幾轉(zhuǎn)，到每分鐘幾萬轉(zhuǎn)都可以很容易實現(xiàn)。碳刷電機：無刷電機一般啟動以后工作轉(zhuǎn)速恒定，調(diào)速不是很容易，串激電機也能達(dá)到20000轉(zhuǎn)/秒，但是使用壽命會比較短。
BDD-1020S BDD-1120S BDD-1220S BDD-1320S BDD-1420S BDD-1520S
BDD-2020S BDD-2120S BDD-2220S BDD-2320S BDD-2420S BDD-2520S
BDD-3020S BDD-3120S BDD-3220S BDD-3320S BDD-3420S BDD-3520S
BDD-1001S BDD-1101S BDD-1201S BDD-1301S BDD-1401S BDD-1501S
BDD-2001S BDD-2101S BDD-2201S BDD-2301S BDD-2401S BDD-2501S
BDD-3001S BDD-3101S BDD-3201S BDD-3301S BDD-3401S BDD-3501S
BDD-1011S BDD-1111S BDD-1211S BDD-1311S BDD-1411S BDD-1511S
BDD-2011S BDD-2111S BDD-2211S BDD-2311S BDD-2411S BDD-2511S
表1電流互感器測量回路的功耗2、傳輸距離加大下相同負(fù)載下，二次電流為1A互感器的傳輸距離是5A的25倍，這樣可避免5/1A中間互感器或選用大容量互感器。目前隨著計算機和數(shù)控儀表的普及和發(fā)展，額定二次電流為1A及以下規(guī)格的電流互感器選型已經(jīng)較普遍。 (2)計算短路電流時，需所有發(fā)為保證電力系統(tǒng)的可靠性，系統(tǒng)的發(fā)電機總是冗余的、有備用的，所以，這對潮流計算是一個巨大的挑戰(zhàn)。為此，建議三相短路電流計算。①以全接線潮流文件為基礎(chǔ)，在潮流計算中應(yīng)包括所有發(fā)電機，未運行的機組以零出力機組表示。
BDD-3011S BDD-3110S BDD-3211S BDD-3311S BDD-3411S BDD-3511S
BDD-1021S BDD-1121S BDD-1221S BDD-1321S BDD-1421S BDD-1521S
BDD-2021S BDD-2121S BDD-2221S BDD-2321S BDD-2421S BDD-2521S
BDD-3021S BDD-3121S BDD-3221S BDD-3321S BDD-3421S BDD-3521S
BDD-1002S BDD-1102S BDD-1202S BDD-1302S BDD-1402S BDD-1502S
BDD-2002S BDD-2102S BDD-2202S BDD-2302S BDD-2402S BDD-2502S
BDD-3002S BDD-3102S BDD-3202S BDD-3302S BDD-3402S BDD-3502S
BDD-1012S BDD-1112S BDD-1212S BDD-1312S BDD-1412S BDD-1512S
BDD-2012S BDD-2112S BDD-2212S BDD-2312S BDD-2412S BDD-2512S
BDD-3012S BDD-3110S BDD-3212S BDD-3312S BDD-3412S BDD-3512S
BDD-1022S BDD-1122S BDD-1222S BDD-1322S BDD-1422S BDD-1522S
BDD-2022S BDD-2122S BDD-2222S BDD-2322S BDD-2422S BDD-2522S
BDD-3022S BDD-3122S BDD-3222S BDD-3322S BDD-3422S BDD-3522S
BDD-1003S BDD-1103S BDD-1203S BDD-1303S BDD-1403S BDD-1503S
BDD-2003S BDD-2103S BDD-2203S BDD-2303S BDD-2403S BDD-2503S
BDD-3003S BDD-3103S BDD-3203S BDD-3303S BDD-3403S BDD-3503S
BDD-1013S BDD-1113S BDD-1213S BDD-1313S BDD-1413S BDD-1513S
BDD-2013S BDD-2113S BDD-2213S BDD-2313S BDD-2413S BDD-2513S
BDD-3013S BDD-3110S BDD-3213S BDD-3313S BDD-3413S BDD-3513S
BDD-1023S BDD-1123S BDD-1223S BDD-1323S BDD-1423S BDD-1523S
為了使單相異步電動機能夠自行起動，必須設(shè)法使單相異步電動機在起動時形成一個磁場。為此,采取了幾種不同的措施,如在單相異步電動機中設(shè)置起動繞組(副繞組)。主、副繞組在空間一般相差90°電角度。當(dāng)設(shè)法使主、副繞組中流過不同相位的電流時，可以產(chǎn)生兩相磁場，從而達(dá)到單相異步電起動的目的。 三相三繼電器的三相星形接線（三相式接線）互感器與繼電器均接成星形，三個繼電器的觸點為并聯(lián)，其中任一觸點閉合后均可動作于跳閘或起動時間繼電器。三相星形接線時，兩個電流是相等的，因此接線系數(shù)＝1。常用于110kV及以上中性點直接接地系統(tǒng)中，作為相間短路和單相短路的保護。
BDD-2023S BDD-2123S BDD-2223S BDD-2323S BDD-2423S BDD-2523S
BDD-3023S BDD-3123S BDD-3223S BDD-3323S BDD-3423S BDD-3523S
BDD-1004S BDD-1104S BDD-1204S BDD-1304S BDD-1404S BDD-1504S
BDD-2004S BDD-2104S BDD-2204S BDD-2304S BDD-2404S BDD-2504S
BDD-3004S BDD-3104S BDD-3204S BDD-3304S BDD-3404S BDD-3504S
BDD-1014S BDD-1114S BDD-1214S BDD-1314S BDD-1414S BDD-1514S
BDD-2014S BDD-2114S BDD-2214S BDD-2314S BDD-2414S BDD-2514S
BDD-3014S BDD-3110S BDD-3214S BDD-3314S BDD-3414S BDD-3514S
BDD-1024S BDD-1124S BDD-1224S BDD-1324S BDD-1424S BDD-1524S
BDD-2024S BDD-2124S BDD-2224S BDD-2324S BDD-2424S BDD-2524S
BDD-3024S BDD-3124S BDD-3224S BDD-3324S BDD-3424S BDD-3524S
先看通電延時時間繼電器的觸點：通電延時時間繼電器的觸點看圓弧，圓弧向圓心方向移動，帶動觸點延時動作。再看斷電延時時間繼電器的觸點：斷電延時時間繼電器的觸點也是看圓弧，通電后觸點動作。斷電后，圓弧向圓心方向移動，帶動觸點延時復(fù)位。 這種情況下在更換結(jié)束投入使用后，由于器動靜磁鐵吸合時過程中會對器底部產(chǎn)生較大的沖擊力，而因為器底部受力不均，極易導(dǎo)致其底部碎裂。本人早前在某次維修過程中，因趕時間只在CJT系列交流器底部對角位置上，分別上了一粒螺釘，結(jié)果器在使用一天后，底部就被沖擊力震碎了。