How many megohms should the generator insulation be?

The insulation resistance of the generator should not be less than 0.5 MΩ.

Insulation resistance is the most basic insulation indicator for electrical equipment and electrical circuits. For transfer testing of low-voltage electrical equipment, the insulation resistance of motors, distribution equipment and distribution lines at normal temperature should not be less than 0.5MΩ (for equipment and lines in operation , the insulation resistance should not be less than 1 MΩ/kV).

As long as the insulation resistance of the generator rotor winding is not less than 0.5MΩ, it can be considered qualified.

The insulation resistance of the generator stator is not less than 1MΩ per kV and can be considered qualified.

Detailed information:

< p>Insulation resistanceof the generator stator winding is greatly affected by dirt, humidity, temperature, etc., so the current relevant regulations do not establish rigid regulations, but can only be compared with the results of previous measurements to judge the insulation quality of the stator winding.

Since insulation resistance is greatly affected by temperature, insulation resistance will decrease by half for every 10°C increase in temperature. Therefore, for ease of comparison, the insulation resistance at different temperatures is usually converted into a value. insulation at 75°C.

Factors affecting insulation resistance

1. Ambient temperature and humidity:

The insulation resistance value of general materials decreases with increasing ambient temperature and humidity. Relatively speaking, the surface resistance (rate) is more sensitiveble to ambient humidity, while volume resistance (rate) is more sensitive to temperature. Therefore, when measuring insulation resistance, it is necessary to specify the temperature and humidity at which the sample and the environment are in equilibrium.

2. Cable Specific Factors: When the cable is heated and wet, the insulation material ages. Its insulation resistance is reduced.

Baidu Encyclopedia - Generator Test

Baidu Encyclopedia - Insulation Resistance

1. Be sure before using the water cooled generator insulation resistance tester. read this manual carefully.

2. The water-cooled generator insulation resistance tester should avoid serious vibration.

3. The operator of the water-cooled generator insulation resistance tester should exercise common sense in the use of general electrical equipment or instruments.

4. The youwater cooled generator insulation resistance tester can be used indoors and outdoors, but it should be used away from rain, corrosive gases, excessive dust, high temperatures high temperatures, direct sunlight and other places.

5. Maintenance, maintenance and adjustment of the instrument must be carried out by professionals.

6. Strictly adhere to safe operating procedures.

7. Non-testers should stay away from the high voltage testing area. The testing area should be clearly marked with fences, ropes, warning signs, etc.

8. Touching the test leads during testing is strictly prohibited!

9. After the test is completed, the test terminal must be short-circuited and discharged manually!