Overview of the Nondestructive Evaluation Methods for Substation Grounding Grids Fault Diagnosis

Abstract

Abstract:

The nondestructive evaluation methods for defect diagnosis for substation grounding grids are summarized, including the DL/T standard detection method, resistive network method, network node magnetic induction method, electrochemical analysis and ultrasonic guided wave detection method, which belongs to five commonly used methods nowadays. The nondestructive evaluation method for diagnosis of various defects of the substation grounding grids are classified and compared, and the their situation is also introduced. Based on those works, the development of nondestructive evaluation methods for substation grounding grids fault diagnosis are discussed, then it is pointed out that detection method based on the substation grounding state response of the input and output signals is a research topic worthy of future development.

Key words: Grounding grid, fault diagnosis, nondestructive evaluation, state response, detection method

CLC Number:

TM77

Si Wenrong,Fu Chenzhao,Bian Xiaoliang,Shi Chunbo,Xu Zhibin. Overview of the Nondestructive Evaluation Methods for Substation Grounding Grids Fault Diagnosis[J]. Journal of Electrical Engineering, 2015, 10(8): 14-21.

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方法	原理	优点	缺点
DL/T 标准检测	电路	原理概念清楚,方法成熟	测量工作量大,无法反映腐蚀程度和断点情况
电阻网络节点	电路、数值计算	原理概念清楚,测试简单	测试精度难以保证,结果受图样不全或施工改造影响大
磁感应强度	电磁	原理概念清楚,测试工作量大	结果受图样不全或施工改造影响大,计算工作量大
电化学分析	腐蚀电化学	方法相对成熟,测试简单	只能获得局部腐蚀数据,全站检测工作量大
超声导波检测	无损检测、波动理论	方法相对成熟、结果清楚直接	检测结果局限性较大,全站检测工作量大