描述
1、電壓互感器在運行中二次繞組為什么要接地?
防止絕緣擊穿時二次惻串入高壓,危及人身和設備的安全,該接地為保護接地。
2、電壓互感器高壓熔斷的原因主要有哪些?
1)系統(tǒng)發(fā)生單項間歇性電弧接地,引起電壓互感器的鐵磁諧振
2)熔斷器長期運行,自然老化熔斷
3)電壓互感器本身內部出現(xiàn)單相接地或相間短路鼓障
4)二次側發(fā)生短路而二次側熔斷器未熔斷,也可能造成高壓熔斷器的熔斷
3、電壓互感器電壓消失后應注意什么?
LH-11型距離保護的啟動元件與測量元件都通有10mA的助磁電流,當電壓互感器電壓消失后,執(zhí)行元件因瞬間制動力矩消失,在助磁電流的作用下,接點閉合不返回,因此,一旦電壓互感器電壓消失后,首先將保護退出,然后解除本保護直流,使啟動元件與測量元件的執(zhí)行元件返回。在投入保護時,一定要首先投保護的電壓回路,然后再投直流。
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主營:世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國AB)系列產品》
②Schneider(施耐德電氣)系列產品》
③General electric(通用電氣)系列產品》
④Westinghouse(美國西屋)系列產品》
⑤SIEMENS(西門子系列產品)》
⑥銷售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(福克斯波羅):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉換、輸入/輸出信號處理、數(shù)
據通信及處理等。Invensys Triconex:冗余容錯控制系統(tǒng)、基于三重模件冗余(TMR)
結構的zui現(xiàn)代化的容錯控制器。
⑨Siemens(西門子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂):Indramat,I/O模塊,PLC控制器,驅動模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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