保护接零与零线带电李雅轩（天津职业大学，３００４０２）我国大部分低压电网都采用变压器中性点直接接地的三相四线制电网。在这种电网中，保护接零防止人身触电事故应用的十分普遍。然而，在某些情况下，零线是可能带电的，这就使得与保护零线相连的电气设备金属外壳等... Protection of zero and neutral livelines Li Yaxuan (Tianjin Polytechnic University, 300402) Most of China’s low-voltage power grids use three-phase four-wire grids with transformer neutrals directly grounded. In such a power grid, the protection of zeros to prevent personal electric shock accidents is very common. However, in some cases, the neutral wire may be charged, which makes the metal housing of the electrical equipment connected to the protection neutral wire, etc...