Condition assessment of porcelain and toughened glass insulators from residual strength tests

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2006-10-01 DOI:10.1109/CEIDP.2006.311957

A.P. Mishra, R. Gorur, S. Venkataraman, D. Kingsbury

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引用次数: 10

Abstract

Transmission and distribution networks of most utilities worldwide have a substantial quantity of porcelain and toughened glass insulators that have been in service for over 30 years; a number that has been traditionally considered as useful life for planning purposes. Many utilities are implementing programs to replace older or defective insulators for improving reliability and also for upgrading their lines. In order to help prioritize line maintenance it is important to identify the condition of insulators and replace those insulators whose performance has reduced significantly from their new condition, hence threatening reliability. In this project, porcelain and toughened glass insulators that were in service for periods ranging from 10-30 years were removed from several locations. Electrical (puncture strength, flashover voltage) and mechanical (tensile strength) tests were performed to assess any reduction in performance. Diagnostic tests such as analysis of bonding agents, identification of internal failure paths were performed to understand failure causes. A sufficiently large number of samples were evaluated and this permitted condition assessment with statistically significant confidence limits

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瓷绝缘子和钢化玻璃绝缘子残余强度试验的状态评定

世界上大多数公用事业的输配电网络都有大量的瓷和钢化玻璃绝缘子，这些绝缘子已经使用了30多年;一个传统上被认为是用于规划目的的有效寿命的数字。许多公用事业公司正在实施更换旧的或有缺陷的绝缘体的计划，以提高可靠性和升级他们的线路。为了帮助确定线路维护的优先顺序，重要的是要识别绝缘子的状态，并更换那些性能比新状态明显下降，从而威胁到可靠性的绝缘子。在这个项目中，使用了10-30年的瓷和钢化玻璃绝缘体从几个地方移走。进行电气(穿刺强度、闪络电压)和机械(拉伸强度)测试，以评估性能的任何降低。进行了诸如粘结剂分析、内部失效路径识别等诊断测试，以了解失效原因。评估了足够多的样本，这使得条件评估具有统计上显著的置信限

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2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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