AS-S890-010智能工控

1)局部放电试验

　　局部放电试验是非破坏性试验项目，目前有两类试验方法，一种是以工频耐压作为预激磁电压，降到局部放电试验电压(一般为Um/√3的倍数，变压器为1.5倍，互感器为1.1～1.2倍)，持续时间几分钟，测局部放电量；另一种是以Um为预激磁电压，降到局部放电试验电压，持续1小时，测局部放电量。后一种为变压器所采用。预激磁电压是模拟运行中过电压，预激磁电压激发的局部放电量不应由局部放电试验电压所延续，概念是系统上有过电压时所激发的局部放电量不会由长期工作电压所延续。这一方法是使变压器或互感器在Um/√3长期工作电压下无局部放电量，以保证变压器能安全运行，使局部放电起始电压与局部放电熄灭电压都能高于Um/√3。

　　因此，变压器的绝缘结构设计、绝缘件加工与工艺处理、带电与接地电极表面场强、绝缘介质的承受场强等都要使局部放电量小于规定值来考虑。不能以主、纵绝缘是否放电作为依据。

　　以工频耐压作为预激磁电压时，局部放电试验电压的持续时间一般较短，约1～5分钟。延长局部放电试验电压持续时间对绝缘是较为严峻，有时会引起破坏性损坏。以Um作为预激磁电压时局部放电试验电压持续时间较长，标准要求为1小时，能承受多长时间与绝缘结构的伏秒特性有关。

　　局部放电量一般与带电与接地电极表面的场强有关，与电源的频率无关。试验地点的背境噪声要小，电源的局部放电量要隔离。

　　从试验顺序而言，局部放电试验应放在所有绝缘试验之后，从试验类型而言。长时感应带局部放电试验或短时感应带局部放电试验之一要作为变压器出厂试验。从变压器的Um等级而言，现有标准，Um≥252kV起要作局部放电试验，正在修订的IEC76-3，Um≥126kV起要作局部放电试验。

　　从具体铁心结构而言，采用三相五柱铁心结构的变压器，在作局部放电试验时不能使上下铁轭内磁通密度饱和。从绝缘结构而言，应能承受三相法作局部放电试验的要求。

　　2)截波冲击试验

　　一般是波尾截断的波形，可用IEC标准棒状间隙截断，也可用多极点火截断装置截断。用多极点火截断装置截断时，可获得较准的截断时间，示伤波的截断时间差异大于0.15μS，截波冲击试验结果就有问题。用棒状间隙截断就不易从截断时间的差异来判断是否能通过试验。

　　截波试验电压为110%全波试验电压时，如截断时间小于等于3μS时，两者强度相同。与GIS联的变压器必须要考虑截波试验。

　　截波试验必须与全波试验交替进行。一般采用负极性截波。

　　3)全波冲击试验

　　正在修订的IEC76--3标准，已将全波冲击试验列为Um≥126kV变压器的出厂试验项目。要进行突发短路试验(特殊试验项目之一)的变压器，要在短路试验后作全波冲击试验。

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