基于同轴电容的谐波电压监测及影响因素分析  

Harmonic voltage monitoring based on coaxial capacitor and the analysis of influencing factors

作　　者：何文林 詹江杨 HE Wenlin;ZHAN Jiangyang(State Grid Zhejiang Electric Power Co.,Ltd.Research Institute,Hangzhou 310014,China)

机构地区：[1]国网浙江省电力有限公司电力科学研究院,杭州300014

出　　处：《浙江电力》2023年第3期103-108,共6页Zhejiang Electric Power

摘　　要：谐波含量是电能质量的关键指标,高电压等级电网的谐波电压监测水平尚不能完全满足电力企业生产需求。通过建立基于同轴电容末屏接地电流的谐波电压测试系统,分析了不同频率下电容量对谐波电压含有率测试结果的影响程度,实测表明电容量变化对谐波电压含有率的影响不大于2%;分析了绝缘性能与谐波电压含有率误差的关联关系,当tanδ(f)小于0.2时,谐波电压含有率测试误差不超过2%;实测了不同绝缘状态下tanδ(f)的变化范围,分析表明绝缘状态对谐波电压含有率影响不明显。Harmonic content is a key indicator of power quality,and the level of harmonic voltage monitoring in high-voltage power grids still cannot fully meet the production needs of electric power enterprises.By establishing a harmonic voltage testing system based on the end screen grounding current of coaxial capacitor,the influence of capacitance on the test results of harmonic voltage content at different frequencies is analyzed.The actual measurement shows that the influence of capacitance change on the harmonic voltage content is no more than 2%.The correlation between insulation performance and the error of harmonic voltage content is analyzed:when tanδis less than 0.2,the test error of harmonic voltage content is no more than 2%;the range of variation of tanδ(f)under different insulation states is measured,and the analysis shows that the influence of insulation state on harmonic voltage content rate is not significant.

关 键 词：同轴电容 电流互感器 谐波电压 监测 

分 类 号：TM935[电气工程—电力电子与电力传动]