Diesel generator belongs to a kind of power supply equipment, since it is the power supply equipment when use will produce voltage or current, so to be on the safe side in diesel generator grounding wire must let it, but also in accordance with the requirements of the diesel generator grounding line to operate, so it can protect the one who is, won’t easily use diesel generator to get an electric shock, So what are the ground wire requirements for diesel generators? How many ways?
Ground cable requirements for diesel generators
1. For personal safety, the generator and switch screen must have another ground wire, the ground wire area is not less than the cross-sectional area of the generator output wire. The ground cable can be connected to an underground water pipe or a steel plate buried deep underground. Ensure that the ground resistance is not greater than 50 ohms.
2. The shell is a protective grounding line to prevent the shell from being charged. The line of the neutral point is the working midline, which is a 4-wire midline.
3.If the mobile generator work zero line is not used, it does not need to be connected, if it is used, it is connected to the distribution box, and the protection of the zero line in the vicinity of the generator can play a pile.
4.Whether single-phase generator or three-phase generator, or to ground for safety. Leakage protector will generally work, but there is a response time, so the safety or ground first.
5. The grounding point is arranged at the end of the chassis of the diesel generator set and must be connected to the appropriate grounding position.
6. Alternator grounding line connection is usually determined by the user installation, when the diesel generator set as the only power supply, the center line must be directly connected to the factory grounding line.
Diesel generators can be grounded in several ways
1. Working grounding
In A SYSTEM WHERE THE neutral POINT is not grounded, THE grounding OF ONE phase will raise the ground voltage OF the other TWO phases to the line voltage. In the neutral ground system, it is close to the phase voltage, so the insulation level of electrical equipment and transmission lines can be reduced, saving investment.
2. Protection grounding
Protective grounding refers to grounding the metal shell of electrical equipment. It is suitable for low-voltage systems where the neutral point is not grounded. When the insulation of a phase winding of the motor is damaged so that the shell is charged and not grounded, the human body touches the shell, which is equivalent to a single-phase electric shock. At this time, the size of the grounding current depends on the resistance of the body and insulation resistance. When the insulation of the system decreases, there is a danger of electric shock.
3. Protection zero
Zero protection is to connect the metal shell of electrical equipment to the zero line, which is suitable for low voltage systems with neutral ground. Take the motor as an example, when the insulation of a phase winding of the motor is damaged and connected with the shell, it will form a single-phase short circuit, which will quickly fuse the fuse in this phase, and the shell will no longer be charged.
Jiangsu Meiao Power Technology Co., Ltd. is an important manufacturer of diesel generators. The company mainly manufactures and sells diesel generator sets with power of 3-3000kW, mobile power station of 24-600kW, Marine emergency diesel generator set of 24-800kW, gas generator set, heavy oil generator set and all kinds of imported series, special series (trailer, static speaker, mobile lighthouse, container, etc.) diesel generator At the same time, we are engaged in generator set maintenance and after-sale service of generator set accessories.
