20 kV配電網的中性點接地方式及設備選型
黃義揚
廣東電網有限責任公司珠海供電局，廣東 珠海 519000
摘 要：20 kV配電設備的選擇與系統中性點接地方式相關。分析了20 kV配電網采用的中心點不接地、經消弧線圈接地和經小電阻接地3種運行方式，給出了配電網中電容電流的計算方法及配電網設備的選擇方案。在20 kV配電網升級改造中，選擇合理的中性點接地方式，有利于提高電網供電的持續性和有效性。
關鍵詞：20 kV配電網；中性點接地方式；設備選型
中圖分類號：TM727.2；TM862 文獻標識碼：B 文章編號：1007-3175(2015)08-0044-04
Neutral Grounding Mode and Equipment Selection for 20 kV Distribution Network
HUANG Yi-yang
Zhuhai Power Supply Bureau of Guangdong Grid Limited Liability Company, Zhuhai 519000, China
Abstract: The selection of 20 kV distribution equipment involves the system neutral grounding mode. This paper analyzed that the 20 kV distribution network adopted three kinds of operational modes including non-neutral grounding mode, grounding via arc suppression coil and grounding via small resistance. This paper gave the capacitance current calculation mode of distribution network and the selection scheme of distribution network equipment. During the process of 20 kV distribution network upgrading and rebuilding, rational selection of neutral grounding mode is in favour of raising the continuity and validity of grid power supply.
Key words: 20 kV distribution network; neutral point grounding mode; type selection of equipment
參考文獻
[1] 陳根永，侯永將，楊鳳民，等.20 kV配電電壓等級的接地方式研究［J］.鄭州大學學報：工學版，2010，31(3)：33-37.
[2] 汲亞飛，侯義明.20kV配電網中性點接地方式選擇的研究[J].供用電，2008，25(5)：9-12.
[3] 劉文婷.20kV電網改造中性點接地方式的研究[J].機電信息，2013(6)：9-10.
