To measure the insulation resistance between each two-phase winding of the hydraulic oil pump motor and each group of windings and the casing, it is generally measured using a megohmmeter (shake meter). So how do we know the insulation performance and quality of the motor from the measurement results? Today, the editor of Dalan Motor will take you to get acquainted.
1. When using a megohmmeter to measure the insulation resistance, a 500-volt megohmmeter is usually used for motors with voltages below 500 volts; a 1000-volt megohmmeter is used for motors with 500-1000 volts. For motors with voltages above 1000 volts, measure with a 2500 volt megohmmeter.
2. In the thermal state (75 ° C) of the motor, the insulation resistance value of the general small and medium-sized low-voltage motors should not be less than 0.5 megohms, and the insulation resistance value of the stator per kilovolt working voltage of the high-voltage motors should not be less than 1 megohms. The insulation resistance of the winding rotor winding of 1000 volt working voltage shall not be less than 0.5 megohms; the insulation resistance of the secondary circuit of the motor shall not be less than 1 megohms.
3. The measurement steps of motor insulation are as follows:
(1) Dismantle the six end joints in the motor junction box.
(2) Flatten the megohm, without wiring first, shake the megohm meter. The needle should point to "∞", then short-circuit the two terminals with "l" (line) and "e" ground on the meter with a test clip with wire, slowly shake the handle, and the needle should point to "0".
(3) Measure the resistance between the three-phase windings of the motor. Connect the two test clips to either end of any two-phase winding, lay the watch flat, shake the megohmmeter at a uniform speed of 120 revolutions per minute for one minute, and read the stable indication value of the needle.
(4) In the same way, measure the insulation resistance of each phase winding and casing in turn. However, it should be noted that the terminal marked "e" or "earth" on the table should be connected to the uninsulated place on the cabinet.
----- Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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