How to measure the insulation resistance of the motor? What are the eligibility criteria? -Solutions - Huaqiang Electronic Network

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When it comes to testing the insulation resistance of a motor, a megohmmeter is typically used. This device helps measure the resistance between each pair of windings as well as between each winding and the motor casing, which is essential for determining the overall insulation performance.

For motors operating below 500 volts, a 500-volt megohmmeter is standard. If the motor operates between 500 and 1000 volts, a 1000-volt megohmmeter is required. For high-voltage motors above 1000 volts, a 2500-volt megohmmeter should be used to ensure accurate readings.

In a hot state (around 75°C), small and medium-sized low-voltage motors should have an insulation resistance of at least 0.5 megohms. For high-voltage motors, the stator insulation per kilovolt of working voltage should be no less than 1 megohm, while the wound rotor should have at least 0.5 megohms per kilovolt. Additionally, the secondary circuit of the motor must maintain a minimum insulation resistance of 1 megohm.

These measurements are crucial for ensuring the motor's safety and longevity. Regular checks help identify potential issues early on, preventing costly repairs or failures down the line.