1336S-C015-AN-FR變頻器_漳州鼎晟達自動化設備有限公司

1336S-C015-AN-FR變頻器

1)局部放電試驗

　　局部放電試驗是非破壞性試驗項目，目前有兩類試驗方法，一種是以工頻耐壓作為預激磁電壓，降到局部放電試驗電壓(一般為Um/√3的倍數，變壓器為1.5倍，互感器為1.1～1.2倍)，持續時間幾分鐘，測局部放電量；另一種是以Um為預激磁電壓，降到局部放電試驗電壓，持續1小時，測局部放電量。後一種為變壓器所採用。預激磁電壓是模擬運行中過電壓，預激磁電壓激發的局部放電量不應由局部放電試驗電壓所延續，概念是係統上有過電壓時所激發的局部放電量不會由長期工作電壓所延續。這一方法是使變壓器或互感器在Um/√3長期工作電壓下無局部放電量，以保證變壓器能運行，使局部放電起始電壓與局部放電熄滅電壓都能高於Um/√3。

　　因此，變壓器的絕緣結構設計、絕緣件加工與工藝處理、帶電與接地電極表面場強、絕緣介質的承受場強等都要使局部放電量小於規定值來考慮。不能以主、縱絕緣是否放電作為依據。

　　以工頻耐壓作為預激磁電壓時，局部放電試驗電壓的持續時間一般較短，約1～5分鐘。延長局部放電試驗電壓持續時間對絕緣是較為嚴峻，有時會引起破壞性損壞。以Um作為預激磁電壓時局部放電試驗電壓持續時間較長，標準要求為1小時，能承受多長時間與絕緣結構的伏秒特性有關。

　　局部放電量一般與帶電與接地電極表面的場強有關，與電源的頻率無關。試驗地點的背境噪聲要小，電源的局部放電量要隔離。

　　從試驗順序而言，局部放電試驗應放在所有絕緣試驗之後，從試驗類型而言。長時感應帶局部放電試驗或短時感應帶局部放電試驗之一要作為變壓器出廠試驗。從變壓器的Um等級而言，現有標準，Um 252kV起要作局部放電試驗，正在修訂的IEC76-3，Um 126kV起要作局部放電試驗。

　　從具體鐵心結構而言，採用三相五柱鐵心結構的變壓器，在作局部放電試驗時不能使上下鐵軛內磁通密度飽和。從絕緣結構而言，應能承受三相法作局部放電試驗的要求。

　　2)截波衝擊試驗

　　一般是波尾截斷的波形，可用IEC標準棒狀間隙截斷，也可用多極點火截斷裝置截斷。用多極點火截斷裝置截斷時，可獲得較準的截斷時間，示傷波的截斷時間差異大於0.15μS，截波衝擊試驗結果就有問題。用棒狀間隙截斷就不易從截斷時間的差異來判斷是否能通過試驗。

　　截波試驗電壓為110%全波試驗電壓時，如截斷時間小於等於3μS時，兩者強度相同。與GIS聯的變壓器要考慮截波試驗。

　　截波試驗與全波試驗交替進行。一般採用負極性截波。

　　3)全波衝擊試驗

　　正在修訂的IEC76--3標準，已將全波衝擊試驗列為Um 126kV變壓器的出廠試驗項目。要進行突發短路試驗(特殊試驗項目之一)的變壓器，要在短路試驗後作全波衝擊試驗。

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漳州鼎晟達自動化設備有限公司

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