第一部分分析了机车电器测试系统的需求。

In the first part, the design demands for the testing system of locomotive electric apparatus are analyzed.

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介绍一种便携式保护继电器测试装置的设计及实用电路和主要功能。

This paper introduces the portable protection relay detecting device and the practical circuit, as well as the major functions.

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非接触式电压测试仪：修理电器所必须的。

Non-contact voltage tester: a must for electrical repairs.

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