Study on Transient Characteristics Test Method of Electronic Current Transformer

In EHV and UHV power system,it is necessary to use current transformer for transient protection to ensure the correct operation of the relay protection device. For the lack of detection method and insufficient test ability of detection equipment in testing institutions,the authors presented an "equal ampere-turns"test method for detecting the transient characteristics of electronic current transformer. In this paper, the synthetic test circuit design of transient characteristics is given, and its thermal performance is simulated and calculated. The results show that the test circuit meets the transient characteristics testing requirements of electronic current transformer.