220kV变压器中压侧中性点经小电抗接地的运行分析  

Operation Analysis of Neutral Point on Medium Voltage Side of 220 kV Transformer with Small Reactance Grounding

作　　者：秦彬 杨克难[1] 潘振东 闫存恒 侯靖岩 张海宾 陈琳 QIN Bin;YANG Kenan;PAN Zhendong;YAN Cunheng;HOU Jingyan;ZHANG Haibin;CHEN Lin(Maintenance Company of State Grid Beijing Electric Power Co.,Ltd.,Beijing Fengtai 100068,China)

机构地区：[1]国网北京市电力公司检修分公司,北京丰台100068

出　　处：《农村电气化》2024年第1期25-27,共3页Rural Electrification

摘　　要：北京电网分区运行,其中枢纽站的接地方式关系整个电网运行,K分区中的A变电站采用220 kV变压器中压侧中性点经小电抗接地的运行方式。分析了该分区的主变中性点接地情况、A变电站的等值网络,同时计算了A变电站的短路容量、不同主变并列运行时的单相短路电流,计算表明,中性点经小电抗接地后可降低其单相短路电流,满足设备热稳定性要求。同时提出中性点小电抗投运后对现场运行、倒闸操作的要求。The operation of the Beijing power grid is divided into zones,and the grounding method used at the hub station has a significant impact on the overall operation of the electrical grid.In the K zone,the A substation adopts the operating mode of grounding the medium-voltage side neutral point of the 220 kV transformer through a small reactance.This article analyzes the neutral point grounding situation of the main transformer in this zone and the equivalent network of the A substation.It also calculates the short-circuit capacity of the A substation and the single-phase short-circuit current when different main transformers are operated in parallel.The calculation shows that grounding the neutral point through a small reactance can reduce the single-phase short-circuit current and meet the requirements for equipment thermal stability.The article also proposes the operational and switching requirements when the neutral point small reactance is put into operation.

关 键 词：电网 中性点接地方式 变压器等值网络分析 短路电流计算 

分 类 号：TM407[电气工程—电器]