为了确保城市电网配电系统的正常运行，必须正确地设置继电保护装置。

In order to ensure municipal power distribution system 'normal operation, the protection equipment of relay protection should be correctly set.

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文中详细论述了剩余电流动作保护装置的参数选用，安装要求，低压电网接地方式及安装施工要求等。

This paper introduces the parameter selection, installation, grounding mode of low-voltage power grid and construction method of residual current operated protective device.

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对继电保护系统进行可靠性评估，能及时发现继电保护装置的隐患，避免电网发生故障时因保护装置不正确动作引起事故的扩大。

The reliability assessment to relay protection system can discover the hidden failures of relay protection device, to avoid the expansion of accident due to the incorrect action of relay protection.

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