20 megohms. The one-minute insulation resistance standard for wind turbines is 20 megohms. For motors with a voltage rating of 380 V, use a 500 V or 1000 V megger to measure the ground resistance. A wind turbine is a device that converts wind energy into electrical energy and is mainly composed of blades, generators, mechanical components and electrical components. According to the axis of rotation, wind turbines are mainly divided into two categories: horizontal axis wind turbines and vertical axis wind turbines. Currently, horizontal axis wind turbines occupy the dominant position in the market.
The insulation resistance of the motor is considered qualified as long as it is greater than 1 megohm per kV.
For generally used motors, whether it is a three-phase or single-phase motor, as long as the insulation resistance is greater than 0.4 --- 0.5 megohms, it is qualified. Of course,the higher the motor insulation resistance, the better.
Motor insulation resistance refers to: between windings and windings (i.e. between phases), between windings and shell (i.e. between phases and earth). For general motors, a 500V megometer can be used for testing.
Insulation Resistance
The DC resistance of the insulation under specified conditions.
Insulation resistance is the most basic insulation indicator for electrical equipment and electrical circuits. For transfer testing of low-voltage electrical appliances, 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). The insulation resistance of electrical applianceslow voltage electrical devices and their connection cables and secondary circuits must generally not be less than 1 MΩ; in relatively humid environments, it should not be less than 0.5 MΩ; than 10 MΩ. The insulation resistance of Class I portable electric tools must not be less than 2 MΩ.
Insulation resistance: When a direct voltage is applied to a dielectric and after a certain time the biasing process is completed, the resistance corresponding to the leakage current flowing through the dielectric is called insulation resistance.
Correct Insulation Resistance Measuring Method Modern life is changing with each passing day and people cannot live a single moment without electricity. Electrical safety problems exist in the process of using electricity, in electrical equipment, such as motors, cables, household appliances, etc.
Reference material - Insulation resistance from Baidu Encyclopedia