Transformer neutral point overvoltage relaying protection main includs nod gap and arrestor protection. In this paper, principle of parameter choice and different function of above-mentioned protection are analysed.

• 摘要变压器中性点过电压保护装置主要有棒间隙保护和避雷器保护两种，文中分析了这两种保护装置的不同作用和参数选择的原则。