脉冲电抗器结构应力测量

为了对高压脉冲放电时电抗器结构受力及电流密度分布规律进行分析,使用电阻应变片对电抗器铜带进行应力测量。利用厚壁筒受压模型对应力测量系统的结果进行计算,设计内置气囊增压法来等效铜带上的应力对测量系统进行标定,并对标定实验数据进行验证。使用半桥补偿电路、屏蔽线及电桥盒共地的方法来减小脉冲电磁干扰及测量回路中寄生电阻和电容带来的电气干扰。实验结果表明:同一测量点处的环向应变峰值比轴向应变峰值大,边缘处的应变大于中心处的,需要在电抗器铜带边缘处加强外包约束。根据应力测量结果推断:铜带边缘处电流密度约为中心处电流密度的1.2倍。

Measurement of stress in pulsed reactor structure

In order to analyze the structure stress and the current density distribution on the pulsed reactor in the course of working, the test on the stress is designed. The hoop stress on both the edge and the center of copper belt is obtained by the resistance transducer. The stress result has been validated by calculating the thick wall cylinder model with the inflation pressure. To calibrate the stress value, the copper belt coil with a ballonet inside is designed. The half-bridge circuit, electrical grounding of the bridge cases and shielding wires are designed and put in practice to reduce the pulsed electromagnetic interference. The disturbance generated by the parasitic resistance and the stray capacitance is reduced by electrical grounding of the bridge cases. The experiment results show that the hoop strain is larger than the axial strain, the strain on the edge is larger than the strain in the center. And the current density on the edge is about 1.2 times near the center. Reinforcement should be applied on the edge of the copper belt.