直流叠加高压脉冲的真空灭弧室老炼技术

Conditioning Technology of Vacuum Interrupter with High Voltage Pulse Superimposed on DC Voltage

提高真空灭弧室的老炼均匀度,并有效调控老炼电弧作用区域的能量注入方式和程度,是真空灭弧室老炼技术所要解决的两个核心问题。然而,在单一电源模式下,真空灭弧室触头间隙的击穿条件和放电能量相互制约,其老炼的时间和空间约束条件难以独立调节,所以难以同时满足对老炼均匀度和作用区域能量调控两方面的要求。为此提出了一种直流叠加高压脉冲的真空灭弧室双电源老炼技术方案,通过小能量的高压脉冲实现对触头间隙绝缘弱点的击穿和精确定位,引入大电流对该弱点区域进行老炼处理。与传统老炼方式的实验结果对比表明:该老炼方法可显著提升灭弧室雷电冲击耐压水平,提升幅度在40%左右,为真空灭弧室老炼技术的进一步发展提供了新的思路。

Improving the conditioning uniformity of the vacuum interrupter and effectively regulating the mode and amount of energy injection in the conditioning arc area are two core problems to be solved by the vacuum interrupter conditioning technology.However,in a single power supply mode,the breakdown conditions of the contact gap of the vacuum interrupter and the discharge energy of the arc are mutually restricted,and the time and space constraints of the conditioning are difficult to adjust independently,which is difficult to simultaneously meet the requirements of conditioning for both uniformity and energy regulation in the action area.This paper proposes a dual-power conditioning technology scheme for vacuum interrupters with high voltage pulse superimposed on DC voltage,which achieves breakdown and precise positioning of insulation weaknesses in contact gaps through small-energy high-voltage pulses,and introduces a large current to conditioning the weak areas.Compared with the experimental results of the traditional conditioning method,the conditioning method in this paper can be adopted to significantly improve the lightning impulse withstand voltage level of the vacuum interrupter by about 40%,providing a new idea for the further development of the vacuum interrupter conditioning technology.