330 kV膜纸绝缘结构电容式电压互感器下节电容介损异常研究
Research and Discussion on Abnormal Dielectric Loss of the Lower Section Capacitor of 330 kV Film-paper Insulated CVT in a 500 kV Substation
- 2025年46卷第6期 页码:81-88
DOI:10.14044/j.1674-1757.pcrpc.2025.06.010
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收稿:2025-08-18,
纸质出版:2025-12-25
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陈奕童, 刘从聪, 谭展鹏, 等. 330 kV膜纸绝缘结构电容式电压互感器下节电容介损异常研究[J]. 电力电容器与无功补偿, 2025,46(6):81-88.
CHEN Yitong, LIU Congcong, TAN Zhanpeng, et al. Research and Discussion on Abnormal Dielectric Loss of the Lower Section Capacitor of 330 kV Film-paper Insulated CVT in a 500 kV Substation[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(6): 81-88.
陈奕童, 刘从聪, 谭展鹏, 等. 330 kV膜纸绝缘结构电容式电压互感器下节电容介损异常研究[J]. 电力电容器与无功补偿, 2025,46(6):81-88. DOI: 10.14044/j.1674-1757.pcrpc.2025.06.010.
CHEN Yitong, LIU Congcong, TAN Zhanpeng, et al. Research and Discussion on Abnormal Dielectric Loss of the Lower Section Capacitor of 330 kV Film-paper Insulated CVT in a 500 kV Substation[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(6): 81-88. DOI: 10.14044/j.1674-1757.pcrpc.2025.06.010.
电容式电压互感器(CVT)是用于电力系统中测量、保护和计量的重要电气设备,广泛应用于110 kV及以上电压等级变电站,其绝缘状态对电力系统安稳运行有重要影响。现场试验中常以介质损耗因数(tan δ)测试作为判断电容式电压互感器设备绝缘状态的依据,然而部分采用膜纸复合绝缘结构的电容式电压互感器中存在Garton效应(Garton effect),在10 kV及以下介损试验中有时会出现介质损耗因数偏高等异常数据,并不能反映设备的真实绝缘状态。本文针对一起330 kV膜纸绝缘电容式电压互感器下节电容器因Garton效应介损异常偏高现象进行分析,提出电容式电压互感器现场试验中Garton效应的判定与处理应对方法,为电容式电压互感器介损测量与绝缘状态判别提供了科学参考,对于维持电网运行的可靠性、提升经济效益具有重大意义。
Capacitive voltage transformer(CVT)is an important electrical equipment in power system for measurement,protection and metering,and is widely used in substations at 110 kV and above. Its insulation condition has a significant impact on the stable operation of power system. In on-site tests,the dielectric loss factor(tan δ)is often used as the base for judging the insulation condition of CVT. However,in some CVT with film-paper composite insulation structure the Garton effect is existed. Sometimes,such abnormal data as high tan δ may occur in the dielectric loss test at 10 kV and below,which cannot reflect the real insulation condition of the equipment. In this paper a case of abnormally high dielectric loss in the lower section capacitor of a 330 kV film-paper insulated CVT due to the Garton effect is analyzed,the determination and handling methods of the Garton effect in on-site tests of CVT are proposed,providing a scientific reference for the dielectric loss measurement and insulation condition judgment of CVT. This is of great significance for maintaining the operation reliability of power grid and improving economic benefits.
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