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能夠使電壓互感器運(yùn)行起來(lái)的依據(jù)是什么
Publisher:admin Time:2013/10/10 17:06:01 Click:4386
電壓互感器
主要是將高電壓轉(zhuǎn)變?yōu)榈碗妷海驗(yàn)橛辛怂拇嬖诟黜?xiàng)測(cè)量的儀表和裝置是不能夠直接和高電壓相連接的,這也使繼電器和測(cè)量?jī)x器得到了有效的保護(hù),同時(shí)也將制造工藝的困難給解決了,因?yàn)殡妷夯ジ衅鞯亩螠y(cè)量結(jié)果都是10v,因此繼電器和儀表的電壓線圈得到了標(biāo)準(zhǔn)化。其實(shí)電壓互感器的原理和構(gòu)造和普通的變壓器沒(méi)什么兩樣,都是由同樣的元器件組合而成的,電壓互感器的一次繞組和相電壓是絕緣狀態(tài),它是隨著電壓的高低而產(chǎn)生變化,有著較為多的匝數(shù),而二次的匝數(shù)就比較少了,且不可以短路,二次繞組也是10V的電壓,被接在對(duì)應(yīng)電壓的回路當(dāng)中,它的阻抗大小是根據(jù)通過(guò)的電流來(lái)決定,如果出現(xiàn)短路的話,那么則說(shuō)明阻抗性比較小,如果流量增大的話,那么就會(huì)讓二次熔斷器熔斷從而導(dǎo)致電壓互感器的損壞。
電壓互感器的二次回路是需要進(jìn)行接地的,為的就是防止絕緣損壞設(shè)備以及對(duì)人身造成一定的危害性。
(圖/文
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