局部放電量一般與帶電與接地電極表面的場(chǎng)強(qiáng)有關(guān),與電源的頻率無(wú)關(guān)。試驗(yàn)地點(diǎn)的背境噪聲要小,電源的局部放電量要隔離。
從試驗(yàn)順序而言,局部放電試驗(yàn)應(yīng)放在所有絕緣試驗(yàn)之后,從試驗(yàn)類型而言。長(zhǎng)時(shí)感應(yīng)帶局部放電試驗(yàn)或短時(shí)感應(yīng)帶局部放電試驗(yàn)之一要作為變壓器出廠試驗(yàn)。從變壓器的Um等級(jí)而言,現(xiàn)有標(biāo)準(zhǔn),Um≥252kV起要作局部放電試驗(yàn),正在修訂的IEC76-3,Um≥126kV起要作局部放電試驗(yàn)。
從具體鐵心結(jié)構(gòu)而言,采用三相五柱鐵心結(jié)構(gòu)的變壓器,在作局部放電試驗(yàn)時(shí)不能使上下鐵軛內(nèi)磁通密度飽和。從絕緣結(jié)構(gòu)而言,應(yīng)能承受三相法作局部放電試驗(yàn)的要求。
2)截波沖擊試驗(yàn)
一般是波尾截?cái)嗟牟ㄐ危捎肐EC標(biāo)準(zhǔn)棒狀間隙截?cái),也可用多極點(diǎn)火截?cái)嘌b置截?cái)。用多極點(diǎn)火截?cái)嘌b置截?cái)鄷r(shí),可獲得較準(zhǔn)的截?cái)鄷r(shí)間,示傷波的截?cái)鄷r(shí)間差異大于0.15μS,截波沖擊試驗(yàn)結(jié)果就有問(wèn)題。用棒狀間隙截?cái)嗑筒灰讖慕財(cái)鄷r(shí)間的差異來(lái)判斷是否能通過(guò)試驗(yàn)。
截波試驗(yàn)電壓為110%全波試驗(yàn)電壓時(shí),如截?cái)鄷r(shí)間小于等于3μS時(shí),兩者強(qiáng)度相同。與GIS聯(lián)的變壓器必須要考慮截波試驗(yàn)。
截波試驗(yàn)必須與全波試驗(yàn)交替進(jìn)行。一般采用負(fù)極性截波。
3)全波沖擊試驗(yàn)
正在修訂的IEC76--3標(biāo)準(zhǔn),已將全波沖擊試驗(yàn)列為Um≥126kV變壓器的出廠試驗(yàn)項(xiàng)目。要進(jìn)行突發(fā)短路試驗(yàn)(特殊試驗(yàn)項(xiàng)目之一)的變壓器,要在短路試驗(yàn)后作全波沖擊試驗(yàn)。
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資訊來(lái)源:漳州鼎晟達(dá)自動(dòng)化設(shè)備有限公司
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