参考避雷器负极性电压有以下优势：
The reference arrester negative voltage has the following advantages:
1、 电力系统中雷电过电压多为负极性；
1. Lightning Overvoltage in power system is mostly negative;
2、 由于水的弱电负性，施加负极性电压时更容易发现被测物受潮的缺陷；
2. Because of the weak electronegativity of water, it is easier to find the moisture defect of the tested object when the negative voltage is applied;
3、 试验过程中，负极性电压易于放电，不易击穿，相反正极性电压不易放电，易于击穿。
3. During the test, the negative voltage is easy to discharge and not easy to breakdown, on the contrary, the positive voltage is not easy to discharge and is easy to breakdown.
在不均匀的电场中，气体的击穿电压与电极所带电荷的极性有很大的关系。在同等试验条件下，带负电的金属物比带正电压的金属物的击穿电压要高一倍多，即负电压放电电压高。
In the inhomogeneous electric field, the breakdown voltage of the gas is closely related to the polarity of the charge on the electrode. Under the same test conditions, the breakdown voltage of the metal with negative voltage is more than twice that of the metal with positive voltage, that is, the discharge voltage of the negative voltage is higher.