当故障导致供电系统与外电网断开后，此时供电系统因有功不平衡，将出现频率崩溃现象，导致大面积停电事故。

When disconnected with external power grid due to certain fault, it will result in frequency collapse, and even leads to large-scale blackout owing to the active power imbalance.

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本文着重对工业供电系统电气设备的接地、接零及漏电保护的原理与安装方法等作了详尽的介绍，旨在确保用电安全，防止触电事故的发生。

This article goes into details on the principle and assemblage of earthing, zeroing and leakage prevention with the view of ensuring power supply safety and hindering electric shock accidents.

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大量调研资料证明，越级跳闸事故（以下简称越跳）是我国煤矿高压供电系统目前普遍存在的严重问题。

Based on investigation of large amount of data, it is found that currently inadequate tripping failure of high tension power supply is a serious problem that exists universally in Chinese coal mine.

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