描述
在發(fā)電機并列時，如果兩個電壓的相位不一致，由此而產(chǎn)生的沖擊電流可能達到額定電流的20～30倍，所以是非常危險的。沖擊電流可分解為有功分量和無功分量，有功電流的沖擊不僅要加重汽輪機的負(fù)擔(dān)，還有可能使汽輪機受到很大的機械應(yīng)力，這樣非但不能把待并發(fā)電機拉入同步，而且可能使其它并列運行的發(fā)電機失去同步。
在采用準(zhǔn)同期并列時，發(fā)電機的沖擊電流很小。所以，一般應(yīng)將相角差控制在10o以內(nèi)，此時的沖擊電流約為發(fā)電機額定電流的0.5倍。
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