The necessity of grounding three-phase motors_Wolong Nanyang Explosion-proof Motor, China Motor Manufacturer

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The necessity of grounding three-phase motors

source：ChinaZ time：2024-12-13 09:07nbsp; click：

1. Necessity of grounding three-phase motors

Three-phase motors are motors that use AC power and require three power cords for operation. Under normal circumstances, there will be no contact between the metal casing of the three-phase motor and the power cord. However, if there is a fault inside the motor, such as insulation damage, it is possible that the motor casing and the power cord will come into contact, causing the metal casing of the motor to be charged. If someone touches the metal casing of the motor at this time, an electric shock accident will occur, which may endanger human life in serious cases.

In order to avoid this situation, the three-phase motor must be grounded. Grounding is to connect the metal casing of the motor to the ground so that the metal casing of the motor is charged, thereby ensuring human safety. Therefore, for places where three-phase motors are used, such as factories, hospitals, schools, etc., the three-phase motors must be grounded.

2. The role of grounding three-phase motors

1. Protect human safety

As mentioned above, the main role of grounding three-phase motors is to protect human safety. Through grounding, when the metal casing of the motor is charged, the current is prevented from passing through the human body and causing electric shock accidents.

2. Protect the safety of motors and other equipment

In addition to protecting human safety, three-phase motor grounding can also protect the safety of motors and other equipment. When a fault occurs inside the motor, such as insulation damage, the metal shell of the motor is easily charged. If it is not grounded, it will damage the motor and other equipment. After grounding, the safety of the motor and other equipment is protected.

3. Improve the operating efficiency of the motor

Three-phase motor grounding can also improve the operating efficiency of the motor. When a fault occurs inside the motor, such as insulation damage, if it is not grounded, it will affect the operating efficiency of the motor. After grounding, the operating efficiency of the motor is guaranteed.

3. Precautions for grounding three-phase motors

1. The grounding wire should comply with national standards

When grounding a three-phase motor, the grounding wire should comply with national standards and the grounding resistance should comply with regulations. Otherwise, if the resistance of the grounding wire is too large or too small, it will affect the grounding effect, thereby reducing the safety of grounding.

2. The grounding wire should be tightly connected to the metal shell of the motor

The grounding wire should be tightly connected to the metal shell of the motor, the grounding point should be located on the metal shell of the motor, and the grounding wire should not be less than 2.5mm2. Otherwise, the grounding effect will be affected, thereby reducing the safety of grounding.

3. Regularly check the grounding of three-phase motors

The grounding of three-phase motors should be checked regularly to promptly discover and eliminate safety hazards.

Through the introduction of this article, we can know the necessity and role of grounding of three-phase motors. When using three-phase motors, we must pay attention to grounding issues to ensure the safety of human body and equipment. At the same time, we must also pay attention to the methods and precautions of grounding to avoid accidents caused by improper grounding.
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