一种用于强激光系统的高比能脉冲电容器

High energy density capacitors in large capacitor banks for high power solid-state laser applications

摘要: 为了满足“神光-Ⅲ”原型装置能源系统的需要，桂林金属膜电容器厂研制成功一种高比能脉冲电容器，其尺寸为295 mm×138 mm×730(830) mm，额定电压25 kV，额定电容及偏差为55 μF，0~5 %，损耗角正切值(2.5 kV，50 Hz)小于 0.1%，比能达0.56 J/cm3 。对该型电容器进行性能测试，所得电容偏差都在2%~5%范围，损失角正切值小于0.05%；极间耐压试验全部通过，极-地耐压试验全部通过。寿命试验中，放电电流5 kA，1×104次充放电后，电容量下降1.8%。该型电容器目前已投入运行，工作情况良好。

Abstract: The design, research and test of a metallized dielectric capacitor in Guilin Power Capacitor Corporation(GCC) for SGⅢ prototype laser facility began nearly seven years ago. The MKMJ25—55(25 kV,55 μF,0.56 J/cm3) capacitor, made by GCC, has been successfully utilized in SGⅢ prototype. This paper describes the metallized dielectric configuration, performance of the capacitor and testing and explores its lifetime and failure mechanism. Experiments show that it has a capacitance tolerance of 2%~5% and a dissipation factor lower than 0.05%. It has good dielectric strength since it withstood electrode-electrode and electrode-ground voltages. The capacitance dropped 1.8% after 1×104 charge-discharge cycles in lifetime test.