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變壓器局部放電小知識

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變壓器局部放電小知識

發布日期:2018-06-29 作者:江蘇鶴都電器有限公司 點擊:

局部放電現象,主要指的是高壓電氣設備。

電力設備絕緣在足夠強的電場作用下局部范圍內發生的放電。這種放電以僅造成導體間的絕緣局部短(路橋)接而不形成導電通道為限。每一次局部放電對絕緣介質都會有一些影響,輕微的局部放電對電力設備絕緣的影響較小,絕緣強度的下降較慢;而強烈的局部放電,則會使絕緣強度很快下降。這是使高壓電力設備絕緣損壞的一個重要因素。因此,設計高壓電力設備絕緣時,要考慮在長期工作電壓的作用下,不允許絕緣結構內發生較強烈的局部放電。對運行中的設備要加強監測,當局部放電超過一定程度時,應將設備退出運行,進行檢修或更換。
變壓器局部放電有三大特點:
1、局部放電是局部過熱,電器元件和機械元件老化的預兆;
2、局部放電趨勢是局放隨著時間的上升指數,這是個曲折的過程,某個階段可能下降,但某個階段上升。
3、在絕緣結構中產生局部放電時,會伴隨產生電脈沖、超聲波、電磁輻射、光、化學反應,并引起局部發熱等現象;
由于局部放電存在以上特點,故電氣設備如何避免局部放電、如何去除局部放電,從而使設備正常安全運行就成為電力設備維護人員最多考慮的事情。為了去除這種潛伏性故障現象,如今針對伴隨局部放電而產生的一些電脈沖、超聲波、電磁輻射等信號而衍生出很多在線檢測局部放電現象的方法。

組合式變壓器

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