Withstand Capability Testing and Limitation Measurements on Du/dt and Di/dt of Thyristor Valve of the Controllable Metal Oxide Surge Arrester
Du/dt is voltage rise rate in off-state of thyristor. Di/dt is current rise rate in on-state of thyristor. Du/dt and di/dt are key parameters that determine working security of thyristor valve of the controllable metal oxide surge arrester (CMOA, shortly). Combining with the Jindongnan via Nanyang to Jingmen UHV AC pilot project of China, the maximal values of du/dt and di/dt of thyristor were simulated. Required parameters were put forward. The maximal du/dt was kV/s and the maximal di/dt was 87kA/s. Du/dt and di/dt mustn’t exceed critical value du/dtcrit and di/dtcrit. Though du/dtcrit and di/dtcrit could be provided by factory, they should be tested by actual application condition because actual application condition may be different from the testing condition. So, by testing, the maximal withstand capacity of du/dt and di/dt was tested by actual application condition. Comparing test results with required parameters indicated that the maximal withstand capacity of du/dt of 2.0 to 3.0 inch thyristor was not less than kV/s which was more than required kV/s. Limiting measurement was not needed. The maximal withstand capacity of di/dt was between 865 A/s and 910A/s which was much less than the required 87kA/s. Limiting measures were needed. Study indicated that di/dt could be limited within allowable range by current limited reactor. However reactor may affect limiting switching overvoltage of CMOA. So, appropriate values of reactor should be selected. Study indicated that reactor value might be between 3 and 5 mH. In such range, the current limited reactor has wee influence on CMOA limiting effect on switching overvoltage.
CMOA Thyristor valve Du/dt Di/dt Off-state Onstate
CHEN Xiujuan CHEN Weijiang SHEN Haibin HE Ziming CHEN Lidong LI Guofu
China Electric Power Research Institute Haidian District Beijing 100192 China State Grid Corporation of China Xicheng District Beijing 100031 China
国际会议
三亚
英文
621-623
2012-01-06（万方平台首次上网日期，不代表论文的发表时间）