接地放电后，极化电荷及表层电荷释放，仍存在水树枝内的空间电荷即为残留电荷；

After grounding, polarization charges and shallow charges will be released. The space charges still existing in water tree are called residual charge.

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结果表明，随着直流电压幅值的增加或直流电压施加时间的延长，残留电荷量均逐渐增大并趋于饱和；

The accumulated results show that as the amplitude and the application time of DC voltage increase, the amount of residual charge increases and approaches a saturated value;

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