Do single phase diesel generators need grounding wires?
Usually single phase diesel generator sets have three kinds of grounding: working grounding, protection grounding and protection zero three.
Working grounding is the neutral point of the transformer grounding, protection grounding is the metal shell of the equipment through the grounding wire is connected to the grounding body, protection zero is the metal shell is connected to the protection zero line, repeated grounding is the protection zero line (is led by the neutral point from the metal shell zero line) separated by a distance grounding.
Protective grounding for ungrounded power neutral systems of three phase generator for sale. Its role is once the electrical equipment insulation damage leakage, the human body contact charged shell, at this time, the human body resistance is much greater than the resistance of the grounding body, a large number of points through the metal shell leakage, the voltage to earth can be reduced to the safety voltage of 36V below, its role is: When the insulation structure of a winding of the motor has been damaged so that the shell is charged, if the human body touches the shell without grounding, which is equivalent to single-phase electric shock, the danger of electric shock may occur. And if the protective grounding is used, the human body touches the shell, due to the resistance of the human body and grounding resistance in parallel, due to the resistance of the human body; Much greater than the ground resistance, the current through the body is small, there is no danger of electric shock.
Protection zero is often used for neutral ground in the low-voltage system, its role is: when the insulation structure of a winding of the motor has been destroyed and connected with the shell, because of the use of protection zero, the formation of single-phase short circuit, the fuse in this phase will be quickly broken, the shell will no longer charged. Even when the human body touches the shell before the fuse is broken, the current passing through the human body is very small because the resistance of the human body is much greater than the resistance of the line, and there is no danger of electric shock.
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