动作负载试验中限压型SPD的劣化

Degradation of Pressure Limiting SPD in Action Load Test

通过对U_c分别为385 V和420 V,I_n为20 k A和40 k A的限压型SPD进行冲击相角为0°、180°和90°、270°进行动作负载的比较试验。试验结果表示:相同U_c和I_n下,冲击相角为90°、270°的劣化程度更为严重;同等冲击相角和U_c下,I_n越大劣化程度越明显;同等冲击相角和I_n下,U_c越大劣化程度越严重。

According to the provisions of 7.6.4 in GB18802.1, the preliminary test of the size of the fi＇eewheeling and the phenomenon of the pretreatment test are carried out in the action load test of the surge protector Ⅰ and Ⅱ .In this paper, the comparative tests of the working loads with 0° , 180 ° and 90 ° , 270 ° for the limit phase angles of 385V and 420V, respectively, for 20kA and 40kA, results show： （1） the same Uc and In, the impact phase angle of 90 ° , 270 ° degree of deterioration is more serious;（2） the same impact phase angle and Uc, In greater the greater the degree of deterioration;（3） the same impact phase angle and In, Uc greater the greater the degree of deterioration.