Diagnosis and Analysis of Abnormal Thermal Defect in a 220 kV Oil-immersed Inverted CT

FAN Weinan; WANG Yong; QIN Yu; ZHANG Yaru; FENG Rui; GAO Wensheng

doi:10.13296/j.1001-1609.hva.2019.03.038

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Diagnosis and Analysis of Abnormal Thermal Defect in a 220 kV Oil-immersed Inverted CT

更新时间：2025-04-26

- Diagnosis and Analysis of Abnormal Thermal Defect in a 220 kV Oil-immersed Inverted CT
- High VoltageApparatus Vol. 55, Issue 3, Pages: 245-252(2019)
- 作者机构：
  
  1. 广州供电局有限公司电力试验研究院
  2. 清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2019.03.038
  CLC： TM452
- Published：2019
- 稿件说明：
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[1]范伟男,王勇,覃煜,张亚茹,冯瑞,高文胜.一起220 kV油浸倒置式CT异常发热缺陷诊断分析[J].高压电器,2019,55(03):245-252.

FAN Weinan, WANG Yong, QIN Yu, et al. Diagnosis and Analysis of Abnormal Thermal Defect in a 220 kV Oil-immersed Inverted CT[J]. High voltageapparatus, 2019, 55(3): 245-252.
[1]范伟男,王勇,覃煜,张亚茹,冯瑞,高文胜.一起220 kV油浸倒置式CT异常发热缺陷诊断分析[J].高压电器,2019,55(03):245-252. DOI： 10.13296/j.1001-1609.hva.2019.03.038.

FAN Weinan, WANG Yong, QIN Yu, et al. Diagnosis and Analysis of Abnormal Thermal Defect in a 220 kV Oil-immersed Inverted CT[J]. High voltageapparatus, 2019, 55(3): 245-252. DOI： 10.13296/j.1001-1609.hva.2019.03.038.

摘要

红外检测作为电流互感器（CT）带电检测的重要手段

能快速、实时地带电检测和诊断出设备的大多数异常发热缺陷

防止出现故障。文中首先分析了广州电网自2005年来电流互感器红外带电检测开展的工作质效

发现红外检测可有效检测高压电流互感器缺陷。然后具体分析了一起红外检测发现的220 kV倒置式CT综合致热型缺陷

从现场高压介损试验、绝缘油试验以及局放试验多方法、多维度相结合对发现异常的电流互感器进行了综合诊断分析

明确了异常CT内部缺陷存在。最后通过停电检修解体

发现了异常CT膨胀器内部缺油

器身存在褶皱和泡沫状异物等缺陷

为该型CT的运维提供了经验借鉴。

Abstract

Infrared detection is one of the important on-live detection techniques for current transformer（CT）. By usingthis technique

most cases of the overheating and discharge faults of CT can be detected and diagnosed quickly

therebypreventing certain failures. In this paper

the quality and efficiency of the on-live infrared detection for the CTs inGuangzhou electric power company since 2005 is analyzed firstly. It indicates that the on-live infrared detection can de-tect the faults of the high voltage current transformer effectively. Then a family defect of a 220 kV inversion current trans-former found by an infrared live detection is analyzed in detail. Combined with dielectric loss test

insulation oil test andpartial discharge（PD）test

a comprehensive diagnosis of the abnormal current transformer is carried out

and the exis-tence of the internal defects in the abnormal CT is clearly defined. Finally

through the maintenance the defects in the ab-normal CT are found

such as lack of oil inside the expander and folds and foamy foreign body inside the expander.

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