零序电流互感器安装注意事项及试验方法

Matters Needing Attention in the Installation of Zero Sequence Current Transformer and Its Test Method

本文结合包钢新体系110k V总降压变电站小电阻接地系统运行要求,保护装置通过在一次电缆安装外接零序电流互感器,来提取零序电流,提出一套规范零序电流互感器安装及检验方法,同时明确安装及零序电流互感器试验中须注意的问题,以避免产生较大的零序电流测量误差以及系统发生接地故障、保护拒动及越级跳闸等问题,确保零序电流互感器真正发挥作用。

In this paper, combined with the operating requirements of small resistance grounding system in 110 k V total voltage transformer substation of Baotou Steel Corp, through connecting the zero sequence current transformer in primary cable by the protection device, the zero sequence current is extracted, the specific method of installation and inspection of the zero sequence current transformer is proposed and the problems should be paid attention to in the installation and the test of zero sequence current transformer are cleared to avoid the large measurement error of zero sequence current and the system grounding fault, protect refuse operation and override trip to ensure that the zero sequence current transformer really play a role.