变流器二次侧开路过电压保护器的研制和应用

Development and Application of Protective Device for Prevention of Overvoltage Caused by Open Circiut at Secondary Side of CT

本文简明地介绍国内首次开发研制的变流器二次侧开路限幅限压装置的原理结构,过电压保护器核心部件氧化锌片的保护特性与技术指标,在实验室内测试和在现场模拟开路考核试验及试验结果分析,最后并提出该保护器的应用及规范选择原则。

The principle of the overvoltage protection device is a Special ZnO resistance element shunted across the secondary terminals of CT. The technical characteristics of the special ZnO element are introduced. The laboratory and field tests of the device are described and the results analyzed. Finally the application and the guiding principle for specification selection of the protecting device are recommended.