煤化工企业6~35kV电网中性点接地方式选择及改造

Selection of Neutral Grounding Mode in 6-35kV Power Grid of Coal Chemical Industry and Suggestions for Improvement

本文阐述了现代大型煤化工园区6～35kV电网的特点,综合比较了当前国内中性点非有效接地系统几种常用消弧技术的优缺点,指出了传统的消弧线圈接地技术及熔管接触器式消弧柜的适用范围及存在弊端,介绍了一种新型的基于快速断路器型的消弧技术。同时结合一起典型改造案例,对今后化工园区电网中性点接地方式的选择给出了指导意见。

In this paper,the characteristics of 6-35kV power grid in modern large-scale coal chemical industry park are described,and the advantages and disadvantages of several common arc suppression techniques for non-effective grounding system of neutral point in China are comprehensively compared.This paper points out the application range and disadvantages of traditional arc-suppression coil grounding technology and fusing tube contactor type arc-suppression cabinet,and introduces a new type of arc-suppression technology that based on fast circuit breaker type.At the same time,combined with a typical transformation case,the paper gives some guidance to the selection of neutral grounding mode of power grounding in the future.