特高压用大容量优比特性电容器内熔丝熔断特性试验研究

Study on Test of Fusing Characteristic of Internal Fuse of High Power and Superior Ratio Capacitor for UHV Application

对于交流特高压工程中使用的并联电容器单元,一般有多台电容器单元并联连接,当其中一台电容器单元内部元件击穿时,与其并联的电容器单元将有部分能量注入,会对内熔丝的熔断产生一定的影响。为了验证电容器单元在多台并联连接的情况下内熔丝熔断特性,文中采用型号为BAM7.88-668-1W的并联电容器单元,通过增加并联陪试品的方法来模拟实际运行工况。对试品进行人为的机械穿刺来模拟元件击穿,试验结果表明,在有陪试并联电容器单元存在的情况下,熔丝隔离试验的电压下降程度会大幅度减小。测试结果中,常规隔离试验中上限电压时的压降为25.71%,下限电压时的压降为85.39%,在有两台电容器单元并联连接的情况下,隔离试验中上限电压时的压降仅为15.77%,下限电压时的压降仅为49.44%。通过试验研究交流特高压工程中并联电容器内熔丝的熔断特性,为后续产品的使用提供依据,有利于电容器装置的稳定可靠运行。

For parallel capacitor units used in AC UHV engineering,multiple capacitor units are normally in parallel connection. In case of breakdown of internal element in one unit of the capacitors,partial energy of the capacitor units in parallel with it will be injected,which will cause some influence on the fusing of the internal fuse. In order to verify the fusing characteristics of the internal fuse of multiple capacitor units in parallel connection,type BAM7.88-668-1W parallel capacitor unit is adopted in this paper and the actual operation condition is simulated by way of adding parallel samples. Artificial mechanical puncture of the prototype is used to simulate element breakdown. The test results show that in case of existence of prototype parallel capacitor units,the extent of voltage drop for fuse isolation test will be greatly reduced. In the test results,the voltage drop at the upper limit voltage in the normal isolation test is 25.71%and that at the lower limit voltage is 85.39%. In the case of two capacitor units in parallel connection,the voltage drop at the upper limit voltage in the isolation test is only 15.77% and that at the lower limit voltage is only 49.44%. The study of the fusing characteristic of the internal fuse of parallel capacitor for AC HUV engineering by test can provide reference for the use of subsequent product and is beneficial to the stable and reliable operation of capacitor.