In this paper, the internal fuse of shunt capacitor which was BAM6.56-556-1W used in AC UHV project had been designed and calculated.Combined with the method of energy calculation and fuse current density, and the internal fuse model withΦ0.42 ×160mm was chosen.In order to test the performance of the internal fuse, based on the improvement of the internal fuse parameter, the test sample capacitor was designed and tested according to experi-mental plan which was stricter than GB/T 11024.1-2010, GB/T 11024.1-2001, DL/T840-2003, et al.The result indicated that the revised-design internal fuse which was used in BAM6.56-556-1W sample capacitor had passed all verification test items.Compared with the requirement of standard, the short-circuit discharging voltage was increasing by 30%, the upper limit voltage of fuse insulating test was increasing by 30%, the range of lower limit voltage was in-creasing 10%, and the withstanding voltage of the fuse fracture was increasing 30%.The internal fuse which was ver-ified by test was helpful for the safe and reliable operation of the shunt capacitor installation used in AC UHV project.%文中针对交流特高压工程用型号为BAM6.56-556-1W并联电容器的内熔丝进行了设计计算,采用能量计算与熔丝电流密度相结合的方法,筛选出规格为Φ0 .42 ×160 mm的内熔丝型号. 为了测试内熔丝的性能,本文在内熔丝参数改进的基础上设计出了试品电容器并采用高于GB/T 11024.1-2010、GB/T 11024.1-2001、DL/T840-2003等标准要求的试验方法开展了性能测试试验研究,结果表明,改进设计的内熔丝在型号为BAM6 . 56-556-1W试品电容器上通过了全部验证试验项目,与标准要求值相比:短路放电电压提高1.3 倍,熔丝隔离试验上限电压提高1.3 倍、下限电压范围扩大1.1 倍,熔丝断口耐压提高1.3倍. 经试验验证的内熔丝应用到特高压电容器的设计,有利于保证电容器装置的安全可靠运行.
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