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什么是變壓器繼電器的平衡電壓

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什么是變壓器繼電器的平衡電壓

發布日期:2018-07-07 作者:江蘇鶴都電器有限公司 點擊:

 對干式變壓器來說,所謂繼電器的平衡電壓,就是維持繼電器不發生動作的電壓值。可以通過在電壓繼電器的電壓傳感電路中設置可調電阻器的方法,達到預先設定平衡電壓的目的。這樣,就可以預先設定電阻器可調范圍的電壓值。 干式變壓器通常需要將遠方母線電壓維持在某一個固定水平上。當線路電壓降由于負載增加而增加時,可以使用線路電壓補償裝置包括一個可調電阻和一個帶分接抽頭的電抗器,將電抗器接到一個電流互感器二次側,在電流互感器一次側流過的電流就是負載電流。通過適當調整電阻器和電抗器參數,這取決于線路特性,可以維持系統內某一點上的電壓恒定,而不必考慮負載和功率因數的變化。 電壓繼電器線路的連接方法,應使加在電壓繼電器上的電壓與供電電壓相減。 


    這樣,隨著干式變壓器負載電流的增加,電壓繼電器的平衡狀態將被段電壓調整裝置動作,使電壓繼電器一次側供電點處的電壓提高,其值恰好就等于線路阻抗壓降,以便電壓繼電器恢復平衡。當負載減小時,情況則相反,電壓繼電器和補償裝置通常用在三相線路中,但由于繼電器的電壓線圈為單相,所以一般要將春跨接在兩相線路之間。三相線路的電壓補償裝置的區別僅僅在于對電壓互感器和電流互感器一次側進行連接時,必須保證電壓和電流之間的正確相位關系。如果能夠保持電壓和電流之間的相位關系不變,也可采用不同的相線來連接電壓互感器和電流互感器。在這種連接方法中,由于在單位功率因數下電壓和電流相位正交,因而就可以用電阻器和電抗器分別進行線路電阻補償和線路電抗補償。在所有其他方面,第二種接線方式補償器不存在相位誤差。 


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