结果表明，继电器绝缘的工频耐压特性是影响这一数值的关键因素。

The test results show that the power frequency voltage withstanding characteristics of the insulation of protective relays are the key factor influencing tolerable ground potential rise.

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介绍了变压器工频耐压试验的串联调谐装置，对其性能和特性进行了分析，给出了结论。

The series tuning device fOr the power-frequency withstand voltage test is introduced. The characteristics of the device are analyzed. The conclusion is given.

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