限流电阻对MOA预防性试验的影响

Effect of Current-limiting Resistance on Preventive Test of MOA

将传统U_(1mA)、I_(0.75)的测试方法与目前使用的便携式直流高压发生器测试U_(1mA)、I_(0.75)的方法进行了比较,指出:微安表(带屏蔽)装于MOA高压端,用阻容分压器测试MOA上的电压时,限流电阻对测试结果不会产生影响,但操作不方便;现场使用便携式直流高压发生器做MOA预防性试验时,可以不使用限流电阻,操作方便;控制箱上显示的电压比避雷器端子上所加电压高出2kV,MOA在测试时一般也不会发生击穿短路现象。

Conventional U1mA and I0.75 measurement method was compared with measurement of mobile HVDC generator. It is pointed out that measurement of voltage at MOA with resistance-capacitance divider and shield milliammeter at HV terminal of MOA has no effect of current-limiting resis- tance on test result, but it is not easy for measurement work. Preventive test on MOA with mobile HVDC generator can be done easily at site, and the voltage value read from the control cabinet without current-limiting is by 2 kV higher than that applied at MOA terminal. No breakdown of MOA occurs at test.