雷电冲击试验中的压敏电阻性能

Performance of MOV in impulsive test

为研究在雷电冲击下的压敏电阻的性能,利用冲击试验分析了压敏电阻主动能量配合的残压变化,对于各种能量配合方式做出了分析,发现当压敏电阻在暂态过程中吸收的能量过大时,实际损坏形式以雪崩击穿为主.压敏电阻主动能量配合的一组串并联试验结果表明:与单个压敏电阻相比,多个压敏电阻并联可以给出较低的箝位电压,提高泄放暂态过电流的能力,还可以减缓各压敏电阻的性能退化;压敏电阻的串联都是不可取的.

Advanced impact testing device was employed to study the performance of the MOV under the lightning impulsion.Residual voltage change of the MOV active energy coordination,along with the coordination forms,were comprehensively analyzed in impact testing.Testing results showed that avalanche breakdown was the main damage form when the MOV absorbs more energy in the transient process.The test of MOV＇s AEC in serial and parallel connection indicated that compared with a single MOV,several MOV＇s parallel connection can provide a lower suppress voltage,increase the capability of discharging transient current,and slow down the performance degradation of the MOV.The result also showed that MOV＇s serial connections should always be avoided.