Diesel generators must be grounded. There must be a suitable ground wire. Once a leak occurs, a loop will occur with the earth, seriously affecting human safety.
Protective earthing of diesel generators is used in three-phase power supply neutral point ungrounded systems. Its function is that once the insulation of electrical equipment is damaged and leakage occurs, the human body comes into contact with the energized shell. At this time, the resistance of the human body is much greater than the resistance of the body to the ground (40). , and a large amount of point current escapes to the ground through the metal shell, and the ground voltage may drop below the safety voltage of 36V.
Its function is the following: When the insulation structure of a certain motor winding has been damaged and the shell is loaded, if it is nots grounding and the human body touches the shell, it is equivalent to a single-phase electric shock, and a risk of electric shock may occur.
If protective grounding is used, when the human body touches the hull, the resistance of the human body is connected in parallel with the resistance of the earth since the resistance of the human body is much higher to the resistance of the earth. , the current passing through the human body will be very small and no danger of electric shock will occur.
Detailed Information
The following points should be noted when wiring the diesel generator set:
1. The ground wire connection point. is usually at The chassis end of the diesel generator set should be connected to a suitable ground wire location when installing the ground wire.
2. The connection of the neutral ground wire of the alternator is generally determinedby the user during installation. When the diesel generator set is used as the sole power source, the neutral wire must be directly connected to the factory ground. thread.
3. For more complex installations, the grounding midpoint should be selected to ensure proper operation of the diesel generator set or protective equipment, such as earth fault detection and minimization of circulating current at the earth.
4. The ground wire must be arranged in accordance with the recommendations of the user and local authorities.
5. Ensure equipment wiring is effectively maintained at all times. Maintenance of the wiring system must be carried out in strict accordance with the instructions.
Baidu Encyclopedia - Diesel generator
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