(1)當(dāng)輸入直流信號Ui=0時,輸出信號U0=0
(2)輸出交流信號的幅值,應(yīng)比例于直流信號的大小,
(3)當(dāng)直流信號Ui的極性改變時,輸出交流信號的相位也隨之改變。
27、35kV中性點不接地電網(wǎng)中,線路相間短路保護(hù)配置的原則是什么?
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相間短路保護(hù)配置的原則是:
(1)當(dāng)采用兩相式電流保護(hù)時,電流互感器應(yīng)安裝在各出現(xiàn)同名兩相上(例如A,C相)。
(2)保護(hù)裝置保護(hù)裝置應(yīng)采用遠(yuǎn)后備方式。
(3)如線路短路會使發(fā)電廠廠用母線、主要電源的聯(lián)絡(luò)點母線或重要用戶母線的電壓低于額定電壓的50%-60%時應(yīng)快速切除故障。
28、在高壓電網(wǎng)中,高頻保護(hù)的作用是什么?
高頻保護(hù)作用在遠(yuǎn)距離高壓輸電線路上,對被保護(hù)線路任一點各類故障均能瞬時由兩側(cè)切除,從而能提高電力系統(tǒng)運行的穩(wěn)定性和重合閘的成功率。
29、大接地電流系統(tǒng)中,為什么相間保護(hù)動作的時限比零序保護(hù)的動作時限長?
保護(hù)的動作時限一般是按階梯性原則整定的。相間保護(hù)的動作時限是由用戶到電源方向每級保護(hù)遞增一個時限差構(gòu)成的,而零序保護(hù)則由于降壓變壓器大都是Y,d11接線,當(dāng)?shù)蛪簜?cè)接地短路時,高壓側(cè)無零序電流,其動作時限不需要與變壓器低壓用戶配合。所以零序保護(hù)的動作時限比相間保護(hù)的短。
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