This paper introduces the measure principle of voltage convertor in big direct current survey setting, the question existed in survey and how to improve it.

介绍了大直流计量装置中的电压变换器检测原理，测量中存在的问题以及改进措施。

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The circuit isolated by optical fibre for transmitting drive signals and avoiding over current is proposed to solve drive and protection problems for transistors in high-voltage multi-level convertor.

为解决开关器件在多电平高压功率变换器的驱动和保护问题，提出了一种光纤隔离的驱动保护电路。

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