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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长期以来，公司坚守“重视合同 , 确保质量 : 准时交付 , 严守承诺” 经营理念；以极大的热情致力于创造和实现富**力的企业管理模式；运用先进的计算机管理系统，建有完善的信息化管理平台，为采购、管理、销售、服务等各个业务环节的信息化服务，大大增强了企业核心竞争力。
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资讯来源：漳州鼎晟达自动化设备有限公司