Diesel generators must be grounded. In order to ensure the safety of people and meet the operating needs of the electrical system, the generator set must be grounded and meet strict requirements. There are three types of grounding methods: working grounding, protective grounding, and protective zero connection. The purpose of grounding a diesel generator is:
1. to ground the neutral point, its purpose is:
1) Reduce the electric shock voltage. For a system with an ungrounded neutral point, when one phase is grounded and the human body touches one of the other two phases, the electric shock voltage is more than 1.7 times the voltage phase while for a system with a grounded neutral point, the voltage is greater than 1.7 times the phase voltage. the electric shock voltage drops to a level close to or equal to tphase ension.
2) Promptly switch off defective equipment. For systems where the neutral point is not grounded, when one phase is grounded, the capacitance and insulation resistance between the conductors and ground can form a current path. The grounding current is very low, which is not sufficient to trigger the protection device. operate and cut off the power supply, which cannot ensure the safety of people. For systems with a grounded neutral point, when a phase is grounded and the earth current is large, the protective device will act quickly to disconnect the fault point.
3) Reduce the level of insulation of electrical equipment to earth. In a system with an ungrounded neutral point, when one phase is grounded, the ground voltage of the other two phases rises to the line voltage. PoOn systems with a grounded neutral point, when one phase is grounded, the voltage to ground of the other two phases is only close to the phase voltage, so the insulation level electrical equipment and transmission lines can be reduced.
2. Protective Earthing
Protective earthing is often used in low voltage systems where the neutral point is not earthed. Its function is: when the insulation structure of a certain winding of the. The motor has been destroyed, the outer casing becomes electrified if it is not grounded and the human body touches the shell, it is equivalent to single-phase electric shock and there may be a risk of electric shock. If protective grounding is used, when the human body touches the shell, the resistance of the human body is connected in parallel with the resistance of the earth. Since the resistance of the human body is very highless than the resistance of the earth, the current passing through the human. the body will be very small and there will be no risk of electric shock.
3. Protective zero connection
The protective zero connection is often used in low voltage systems with a grounded neutral point. Its function is: when the insulation structure of a certain winding of the. The motor has been damaged and when the shells are connected to each other, a single-phase short circuit is formed due to the zero protection connection. The fuse in this phase is quickly blown and the hull is no longer charged. Even when the human body touches the box before the fuse blows, because the resistance of the human body is much higher than the resistance of the circuit, the current passing through the human body is very small and there is no risk of electric shock.
Therefore, when assembling the diesel generator, it is necessary to configure a wireearthen. When using a diesel generator set, the diesel generator set must also be used in accordance with the rules of use.
Pull a wire and connect it to the tower, and if there is a transformer, connect it to the transformer ground. It is not easy to set up a separate ground wire. Since you are mobile, you. must move frequently, and it is impossible to do so every time. You have to dig a ground wire somewhere Even if the project is large, others may not let you dig it. There is no need for a ground wire. Regarding grounding requirements: Standard grounding piles should be buried deep in wet areas underground so that the earth can have sufficient discharge conditions.It is not a big deal if the resistance of the pile does not exceed 4 ohms. It is best to use 10 square meters of wire fora 10 kilowatt generator. Otherwise, you can also use 6 square meters of wire.
< p>I hope to adopt it!!