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电网技术  2015 

交流电网地磁感应电流分析的全模型及其应用

DOI: 10.13335/j.1000-3673.pst.2015.06.015, PP. 1562-1567

Keywords: 地磁感应电流,土壤电流场,直流偏磁,变压器,绕组等效直流电流,偏磁风险

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Abstract:

提出考虑土壤电流场畸变地表电位的任意结构电网地磁感应电流(geomagneticallyinducedcurrent,GIC)分布计算的完整模型,计算模型通过GIC-Benchmark标准算例检验,同时对地磁感应激励下与直流接地极入地电流激励下的电网直流电流分布计算模型进行统一。基于计算模型对湖北电网GIC风险进行评估,在东西和南北方向0.05V/km的地电场激励下,湖北电网绕组等效直流电流之和分别为472A和366A,湖北电网对于东西方向的地磁感应的防御能力比南北方向更为脆弱。对湖北电网在地磁感应和直流接地极入地电流双重激励下的风险进行了评估。当地电场方向为北偏西70°且宋家坝注入单极大地运行电流时,湖北电网遭受的直流偏磁危害最严重,该方向上仅0.02V/km的地电场对湖北电网造成的直流偏磁危害即可与宋家坝接地极注入满负荷运行电流时对湖北电网造成的直流偏磁危害相当。在对高压网络进行GIC评估时,不可忽略220kV的网络,否则会对变压器绕组中的GIC评估产生显著影响,中性点电流最大计算偏差可能超过70%。增大线路电阻、变电站接地电阻以及变压器绕组电阻,会使得系统绕组等效直流电流之和先呈指数形式减小,后呈大致线性形式减小。

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