一起500kV电容式电压互感器二次绕组失压故障分析
Analysis of Secondary Winding Voltage Loss Fault of 500kV CVT
- 电力电容器与无功补偿 2025年46卷第5期 页码：91-97
- 作者机构：
- 作者简介：
代英俊（1987—），男，高级工程师、高级技师，从事500kV电网一次设备检修及试验工作。E-mail：dai0725@qq.com。
- 基金信息：
DOI：10.14044/j.1674-1757.pcrpc.2025.05.010
中图分类号：收稿：2025-06-08，
纸质出版：2025-10-25
- 稿件说明：
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代英俊. 一起500kV电容式电压互感器二次绕组失压故障分析[J]. 电力电容器与无功补偿, 2025,46(5):91-97.
DAI Yingjun. Analysis of Secondary Winding Voltage Loss Fault of 500kV CVT[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(5): 91-97.
代英俊. 一起500kV电容式电压互感器二次绕组失压故障分析[J]. 电力电容器与无功补偿, 2025,46(5):91-97. DOI： 10.14044/j.1674-1757.pcrpc.2025.05.010.
DAI Yingjun. Analysis of Secondary Winding Voltage Loss Fault of 500kV CVT[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(5): 91-97. DOI： 10.14044/j.1674-1757.pcrpc.2025.05.010.
摘要
某500kV变电站主变500kV侧电容式电压互感器（CVT）在运行过程中突然发生二次绕组失压故障，随后临时停电对故障CVT进行整体更换。为了分析CVT二次绕组失压故障原因，对故障CVT开展了绝缘电阻、直流电阻、变比、绝缘油、介损及电容量等一系列诊断性试验；结合故障时设备现场检查情况、诊断性试验数据、常见二次绕组失压原因逐一分析得出故障原因为CVT电磁单元中间变压器断线。为了定位CVT中间变压器断线位置，在变电站现场对故障CVT进行解体，对分离后的电磁单元及电容单元检查及试验，最终发现位于电容分压器瓷套内部电磁单元中间变压器引线断裂。最后对CVT设备的运行、维护、试验提出了一些措施及建议。
Abstract
A capacitive voltage transformer（CVT）on the 500kV side of the main transformer at a 500kV substation experienced the fault of secondary winding voltage loss during operation. Subsequently，a temporary power outage is implemented to perform the complete replacement of the faulty CVT. For analyzing the cause of the secondary voltage loss in the CVT，a series of such diagnostic tests as insulation resistance measurement，DC resistance measurement，ratio test，insulating oil analysis，dielectric loss test and capacitance measurement are performed on the faulty CVT. It is concluded that，in combination with the detailed analysis of the on-site inspection，the diagnostic test data and common causes for secondary voltage loss of the equipment in the fault，the cause of the fault is the breakdown of wire in the intermediate transformer within the CVT’s electromagnetic unit. For locating the exact broken position of the intermediate transformer in the CVT，the faulty CVT is disassembled on-site at the substation. The separated electromagnetic unit and capacitor unit are inspected and tested，finally finding that the wire in the intermediate transformer of electromagnetic unit inside the pocelain houding of capacutive voltage divider is broken.Finally，some measures and suggestions on the operation，maintenance and test of the VCT are propsoed.
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