Provides automatic defeat of delay on loss of voltage or sustained undervoltage of emergency source, provided normal supply has been restored.
恢复正常供电的前提下，在失压或应急源的持续欠压下提供延迟的自动失效。
The coefficient of grounding is the ratio of the maximum sustained line-to-ground voltage during faults to the maximum operating line-to-line voltage.
接地系数是故障时最大持续相电压与最大运行线电压之比。
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