中文摘要：

晶闸管器件的断态（开断状态）电压上升率du/dt和通态（导通状态）电流上升率di/dt是决定可控金属氧化物避雷器（CMOA）晶闸管阀工作安全性的关键参数。以长治—南阳—荆门特高压交流试验示范工程为背景,对晶闸管阀中晶闸管器件需要承受的最大du/dt和di/dt进行了仿真计算,提出了技术要求,并给出了限值要求,即du/dt和di/dt均不允许超过其临界值du/dtcrit和di/dtcrit。根据实际使用条件对所选晶闸管器件的du/dtcrit和di/dtcrit进行了试验测试。测试结果和技术要求对比表明：2.0～3.0英寸晶闸管du/dtcrit不小于45kV/μs,大于技术要求28.3kV/μs,无需限制措施;di/dtcrit为865～910A/μs,远小于技术要求87kA/μs,须采取适当的限制措施。研究表明,采用3～5mH的限流电抗器可以将di/dt限制在容许范围内,且限流电抗器对CMOA限制系统操作过电压的效果影响不大,可以采用限流电抗器限制晶闸管器件的di/dt。

英文摘要：

The du/dt（voltage rise rate in off-state of thyristor） and di/dt（current rise rate in on-state of thyristor） are key parameters that determine working security of thyristor valve of the controllable metal oxide surge arrester（CMOA）.Taking the Changzhi via Nanyang to Jingmen UHV AC experimental project of China as an example,we simulated the maximal values of du/dt and di/dt of thyristor,and put forward technical requirements that du/dt and di/dt values were not allowed to exceed their critical values du/dtcrit and di/dtcrit.The maximal du/dt was 28.3 kV/μs and the maximal di/dt was 87 kA/μs.The du/dtcrit and di/dtcrit were tested by actual application condition.Comparing test results with technical requirements indicates that the maximal withstand capacity of du/dtcrit of 2.0 to 3.0 inch thyristor is not less than 45 kV/μs,and the maximal withstand capacity of di/dtcrit is between 865 A/μs and 910 A/μs which is much less than the required 87 kA/μs.Moreover,the di/dt value is often limited by a current limited reactor,and the reactor may affect limitation effect of CMOA on switching overvoltage,so appropriate values of reactor should be selected.The results indicate that,when the reactor value is between 3 and 5 mH,the current limited reactor has little influence on CMOA limiting effect.