Block tubes before the demolition, it is advisable to release high-voltage static electricity, so a number of more secure.

在拆显像管座之前，最好将高压静电放掉，这样更安全一些。

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The utility model provides an ultrasonic fault detection comparing test block for a high-voltage pillar porcelain insulator, consisting of a test block body and arc grooves.

本实用新型提供一种高压支柱瓷绝缘子超声波探伤对比试块。

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Therefore, it is an important theoretical focus that how to obtain the enough high block voltage or block gain meanwhile resolves the wastage efficiently in turn-off transient.

因此，如何在得到足够高的阻断电压（或阻断增益）的同时能有效减小关断损耗，成为目前急待研究的一个重要理论问题。

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