The paper introduced the hazard of large turbine generator operation under abnormal frequency and technical requirements and criteria for low frequency protection.

介绍了大型汽轮发电机组频率异常运行的危害和对低频保护的技术要求及准则；

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Further, the piston is operated at the top dead center position and in the resonance state under all load conditions, thereby further increasing operation frequency.

此外，在所有负载条件下将活塞操作在上死点和共振状态，从而进一步增加操作频率。

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By using it, the test can be done at the operation frequency of circuits under test, therefore results of the test can be more precise and this method can detect different types of faults.

这种方法克服了稳态电流测试方法测试频率低、瞬态电流测试方法对测试仪要求过高等问题，它能以电路的工作频率对电路进行测试，测试结果更准确，可以检测多种类型的故障。

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