关键词：逆变器；刀熔开关；熔断器；电解电容；充电电阻

Abstract: Decrease the electrolytic DC capacitors’ insulativity、capacitance、withstand voltage when ACS800 converters aren’t used for a long time。DC fuses and charging resistors are burn out because of over current，and capacitors are broken down because of over voltage. These make convert