ASBDEP257樂昌縣
傷害電機(jī)絕緣，降低電機(jī)壽命
①大電生的焦耳熱反復(fù)作用于導(dǎo)線外絕緣，使絕緣加速老化、壽命降低。
②大電生的機(jī)械力使導(dǎo)線相互摩擦，降低絕緣壽命。
③高壓開關(guān)合閘時觸頭的抖動現(xiàn)象會在電機(jī)定子繞組上產(chǎn)生操作過電壓，有時會達(dá)到外加電壓的5倍以上，這樣高的過電壓會對電機(jī)絕緣造成傷害。
軟起動時，大電流降低一半左右，瞬間發(fā)熱量僅為直起的1/4左右，絕緣壽命會大大延長；軟起時電機(jī)端電壓可以從零起調(diào)，可免除過電壓傷害。
⒋電動力對電機(jī)的傷害
大電流在電機(jī)定子線圈和轉(zhuǎn)子鼠籠條上產(chǎn)生很大的沖擊力，會造成夾緊松動、線圈變形、鼠籠條斷裂等故障。
軟起動時，由于大電流小，則沖擊力大大減輕。

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