A.雷擊過電壓 B.感性負荷拉閘過電壓 C.合閘瞬間由于轉(zhuǎn)子開路產(chǎn)生過電壓 D.感應(yīng)過電壓
A.額定負荷 B.最大負荷 C.最小負荷 D.平均負荷
A.3倍 B.5 ~ 8倍 C.10倍 D.15倍