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在我国380/220伏电力网络中,广泛采用三相四线制架空线作为配电干线。本文主要探讨三相四线制架空干线引起触电及损坏电子仪器的原因,提出解决的措施。同时指出我院各实验室接地接零中的错误做法。文中提出的解决措施是:改用带重复接地的三相五线制架空线作为配电干线。这样可消除某些电气设备外壳带电现象,消除或减轻某些内过电压的破坏作用。
In China’s 380/220 volt power network, widely used three-phase four-wire overhead lines as the distribution trunk. This article mainly discusses the three-phase four-wire overhead lines cause electric shock and damage to electronic equipment reasons, propose solutions. At the same time pointed out that our laboratory ground access to zero in the wrong practice. The solution proposed in the paper is to use a three-phase five-wire overhead line with repeated ground as the distribution trunk. This can eliminate the phenomenon of some electrical equipment shell charged to eliminate or reduce the damage caused by some of the internal over-voltage.