四平干式变压器：外施耐压试验

外施耐压试验 　　
四平干式变压器的外施耐压试验也叫工频耐压试验，是将所有被试绕组部位施加相等的对地试验电压，通以50Hz正弦波电压1min的试验。它对考核主绝缘强度和主绝缘有否缺陷具有决定性的作用，外施耐压试验和冲击电压试验有着一定的关系。由于冲击电压试验装备复杂，这种试验对中小型四平干式变压器不列入例行试验。对主绝缘来说.有时在冲击电压试验中不易显示出来的问题。在外施耐压试验中却能反映出来，因此，本试验不仅邮 箱：1262980066@qq.com是例行试验的关键项目，也是冲击电压试验后的复查性项目。
在交流试验电压的作用下，设备绝缘存在的潜伏性缺陷有可能发展而引起绝缘击穿。所以交流耐压试验能发现一些非破坏性试验难以发现的缺陷。但有时只是使绝缘内部的潜伏性缺陷有所发展而未击穿，形成对绝缘的一定损伤，因此，交流耐压试验有一定的破坏性，故称这项试验为破坏性试验。

The applied voltage withstand test

Transformer of the applied voltage withstand test is also called frequency voltage withstand test, all the test winding parts exert equal-to-ground test voltage through to the 50 Hz sine wave voltage 1min test. Its assessment of the main dielectric strength and insulation of whether the defect has a decisive effect, there is a certain relationship between the applied voltage withstand test and impulse voltage test. Complex impulse voltage test equipment, test for small and medium-sized transformer is not included in the routine test. The main insulation is sometimes difficult to show the impulse voltage test out the problem. Outside facilities to withstand voltage test can reflect, therefore, the test is not only the key items of the routine tests, but also the impact of the review of projects after the voltage test.
In the role of the AC test voltage equipment insulation existence of latent defects that may develop caused by insulation breakdown. AC voltage test can find some non-destructive testing is difficult to find defects. But sometimes just to make the latent defects of the insulation within the development without breakdown, the formation of some damage to insulation, therefore, the AC voltage test destructive, it is called the test a destructive test.

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