Difference between protective grounding and protection zero-solution-华强电子网

PESD1CAN electrostatic protection SOT23-3 24V two-way

5V, 35pF, bidirectional ESD protection diode

The main differences between protective grounding and protective zeroing are:
(1) Protection principle Different protection grounding is to limit the ground voltage after leakage of equipment so that it does not exceed the safe range. In the high-voltage system, in addition to limiting the ground voltage, in some cases, there is also the role of causing the grid protection device to operate; the protection of the zero is to make the equipment leakage by means of the zero-connected line to form a single-phase short circuit, which promotes the line The protection device operates and the power to the faulty device is turned off. In addition, in the protected zero grid, the protection neutral and repeated grounding can also limit the ground voltage when the device is leaking.
(2) Scope of application Different protective earthings are applicable to high and low voltage power grids that are generally not grounded, and also to low voltage power grids that have adopted other safety measures (such as installing leakage protectors); protection zero is only applicable to neutral points directly Grounded low voltage grid.
(3) Different circuit structure If protective grounding measures are taken, there may be no working zero line in the power grid, only the protective grounding wire; if the protective zeroing measures are taken, the working zero line must be set, and the working zero line is used for zero protection. The protective zero line should not be connected to switches or fuses. When installing a disconnector such as a fuse on the working zero line, a protective ground wire or a zero wire must be additionally installed.