应用激光, 2019, 39 (4): 666, 网络出版: 2019-10-12   

检测方法; 激光超声转换技术; GIS; 内部缺陷

GIS Internal Defect Detection Method Based on Laser Ultrasonic Conversion Technology
作者单位
1 国网重庆市电力公司电力科学研究院, 重庆 401123
2 国网重庆市电力公司武隆区供电有限责任公司, 重庆 409600
摘要
本文基于激光超声转换技术, 对SF6气体绝缘封闭组合电器(GIS)内部缺陷检测方法进行了研究, 通过沈阳市某区电力局GIS设备运行情况的分析、局部放电的特点、局部放电产生原因的对比及激光超声转换技术特点的分析, 对GIS设备内部缺陷局部放电检测中的传感器布置、检测流程、诊断依据及原则进行分析, 并对该电力局基于超声转换技术诊断GIS内部局放的诊断过程进行了实例分析。结果表明, 采用超声波诊断该间隔开关罐体, 确定信号最大点位置为断路器上法兰以下1/4高度, 此时基于断路器罐体一圈, 稳定局放信号能被诊断到, 信号具有较小幅值, 为5.5 mV, 以此处为基准, 向下的信号和向上信号的幅值衰减趋势明显。在罐体一圈, 稳定局放信号均能诊断, 因此可推断放电源位置不在壳体而是处于中心导体。最后提出了GIS局部放电检测和诊断建议, 为设备检修策略提供参考依据。
Abstract
In this paper, based on laser-ultrasonic conversion technology, the internal defect detection method of SF6 gas-insulated enclosed combined electrical appliances (GIS) is studied. Through the analysis of the operation of GIS equipment in Shenyang Electric Power Bureau, the characteristics of partial discharge, the comparison of the causes of partial discharge and the analysis of the characteristics of laser-ultrasonic conversion technology, the sensor layout, detection process, diagnostic basis and characteristics of partial discharge detection of internal defects in GIS equipment are discussed. The principle is analyzed, and the diagnosis process of partial discharge in GIS based on ultrasonic conversion technology is analyzed. The results show that the maximum position of the signal is 1/4 of the height below the upper flange of the circuit breaker. Based on one circle of the circuit breaker tank, the stable partial discharge signal can be diagnosed. The signal has a small amplitude of 5.5 mV. Based on this position, the amplitude attenuation trend of the downward signal and the upward signal is obvious. In one circle of the tank, the stable partial discharge signal can be diagnosed, so it can be inferred that the discharge source is not in the shell but in the central conductor. Finally, some suggestions for partial discharge detection and diagnosis in GIS are put forward to provide reference for equipment maintenance strategy.

王谦, 谭华勇, 胡可. 检测方法; 激光超声转换技术; GIS; 内部缺陷[J]. 应用激光, 2019, 39(4): 666. Wang Qian, Tan Huayong, Hu Ke. GIS Internal Defect Detection Method Based on Laser Ultrasonic Conversion Technology[J]. APPLIED LASER, 2019, 39(4): 666.

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