直流局部放电试验系统的研制及应用

doi:10.11930/j.issn.10.11930.2015.4.76

中国电力 ›› 2015, Vol. 48 ›› Issue (4): 76-82.DOI: 10.11930/j.issn.10.11930.2015.4.76

直流局部放电试验系统的研制及应用

沙彦超¹，周远翔²，聂德鑫³，邓建钢³，刘泽洪⁴，卢理成⁴

1．华北电力科学研究院，北京 100045；
2. 清华大学电机系电力系统及发电设备控制和仿真国家重点实验室，北京 100084；
3. 国网电力科学研究院，湖北武汉 430074；
4. 国家电网公司，北京 100031

收稿日期:2015-02-28 发布日期:2015-12-03 出版日期:2015-04-25
作者简介:沙彦超（1985—），男，河北南宫人，博士，从事电介质绝缘理论和变压器绝缘结构研究。E-mail: shayc09@gmail.com
基金资助:
This work is supported by National Basic Research Program of China(973 Program)(2011CB209400); State Key Lab of Power Systems (SKLD10-M09); Program for ±1 100 kV UHVDC Technology of State Grid Corporation of China (20122000548).

Development and Application of Measurement Device for DC Partial Discharge

SHA Yanchao¹, ZHOU Yuanxiang², NIE Dexin³, DENG Jiangang³, LIU Zehong⁴, LU Licheng⁴

1. North China Electric Power Research Institute, Beijing 100045, China;
2. State Key Lab of Control and Simulation of Power Systems and Generation Equipments, Dept. of Electrical Engineering, Tsinghua University, Beijing 100084, China;
3. State Grid Electric Power Research Institute, Wuhan 430074, China;
4. State Grid Corporation of China, Beijing 100031, China

Received:2015-02-28 Online:2015-12-03 Published:2015-04-25
Contact: 国家重点基础研究发展计划（973计划）资助项目（2011CB209400）；电力系统国家重点实验室基金（SKLD10-M09）资助项目；国家电网重大科技资助项目《±1 100 kV特高压直流技术研究》（20122000548）

摘要/Abstract

摘要： 随着中国特高压直流输电工程的发展，换流变压器等电力设备的安全可靠性问题显得尤为重要。由于直流局部放电试验能够提早发现绝缘缺陷、有效预防直流输电设备绝缘击穿事故的发生，根据直流局部放电机理，研制出一套可用于换流变压器直流耐压过程的局部放电检测的试验系统。该系统具有抗干扰能力强，高速、持续、实时采集的特点，能够保证系统检测的直流局部放电信号的有效性和完整性，并通过典型油纸复合绝缘模型验证了其性能。实践结果表明，它能有效、便捷地测量油纸绝缘直流局部放电的时域信号。对时域信号进行的时频分析和统计分析结果表明：同一电极模型中，统计特征参量的数值上随加压时间变化明显，可实现局部放电发展严重程度的预测；不同电极模型中，统计特征参量分布规律一致，可有效判断缺陷类型，该系统有望广泛地应用于直流输电设备检测。

关键词: 直流局部放电, 抗干扰能力, 软硬件设计, 油纸绝缘, 时频分析, 统计分析, 缺陷类型, 严重程度

Abstract: With the development of UHVDC transmission engineering in China, the safety and reliability of such electrical equipment as converter transformer is particularly important. DC partial discharge is a prominent indicator of insulation defects, and its test can help prevent dielectric breakdown of DC power transmission equipment. Based on the DC partial discharge principle, a DC partial discharge test system was established to monitor the insulation status of converter transformers. Characterized by strong anti-interference ability, and high-speed, persistent and real-time capability in data acquisition, the proposed system can record the DC partial discharge signal efficiently and entirely. The system’s performance was verified through a typical oil-paper compound insulation model. The practical results show that the proposed system can effectively and conveniently measure the DC partial discharge time-domain signal of oil-paper insulation. Time-frequency analysis and statistical analysis of DC partial discharge signal indicates that the statistical characteristic parameters in the model of same electrodes varies significantly with time and can be used to forecast the severity caused by partial discharge, and the the statistical characteristic parameters in the model of different electrodes have the similar distribution tendency and can be used to estimate the defect types. The measuring systemt is expected to be implemented widely in testing DC power transmission devices in China.

Key words: DC partial discharge, anti-interferenc capability, software and hardware design, oil-paper insulation, time-frequency analysis, statistical analysis, defect type, severity

中图分类号:

TM214

沙彦超，周远翔，聂德鑫，邓建钢，刘泽洪，卢理成. 直流局部放电试验系统的研制及应用[J]. 中国电力, 2015, 48(4): 76-82.

SHA Yanchao, ZHOU Yuanxiang, NIE Dexin, DENG Jiangang, LIU Zehong, LU Licheng. Development and Application of Measurement Device for DC Partial Discharge[J]. Electric Power, 2015, 48(4): 76-82.

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直流局部放电试验系统的研制及应用

Development and Application of Measurement Device for DC Partial Discharge

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Development and Application of Measurement Device for DC Partial Discharge

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