压敏电压相近的限压型SPD能量配合分析

摘要

通过不同冲击电压、 SPD级间用不同长度的导线及与其等值的电感连接时的能量配合试验，分析压敏电压相近的限压型SPD间能量的合理配合。分析试验数据，得出结论：两压敏电压相近的SPD并联时，当连接导线自身的分布电感和空心电感的电感值相等时，二者可等效；但当出现磁饱和时，一级SPD通流量明显降低，二级SPD的通流量明显增高，后级残压明显增大；在冲击电压相同的情况下， SPD间连接导线越长，保护效果越好。%The two voltage limiting type SPD energy coordination relevant to similar varistor voltage is analyzed for rationality through testing on energy coordination in several situations, including applying different impulse voltage and SPD interstage conductor of different lengths and equivalent inductance connection of the conductor. The data analysis indicates that: for two SPD of similar varistor voltage in parallel connection, if the distributed inductance of the connecting wire shares the same value with air core inductance, they are equivalent; but if magnetic saturation occurs, the discharge current capacity of first-stage SPD decreases significantly, whereas that of the second-stage SPD increases significantly, and the residual voltage of the latter stage also rises significantly; in case of similar impulse voltage , it shows that: the longer length of the SPD connecting wire, the better protetive effect.