Motor insulation resistance measurements

Generally by megohmmeter measure the insulation resistance of the motor,to measure every two phase winding and insulation resistance between each phase winding and chassis,to judge the insulation performance of the motor.Use of wholesalemotor.blogspot.com measuring

insulation resistance by megger are usually under 500 v voltage of motor using the 500 v megohmmeter measurement;On the 500~1000 v voltage motor in 1000 V megohmmeter measurement.For more than 1000 v voltage motor measured with 2500 v megohmmeter.Motor under the condition of the state of heat (75 ℃),the general small and medium-sized low-voltage motor insulation resistance should not be less than 0.5 ohms,high voltage motor work every kv voltage of stator insulation resistance value shall not be less than 1 megohm,work every kv voltage winding of the rotor winding insulation resistance value, Minimum shall not be less than 0.5 megohm;The secondary loop of the motor insulation resistance should not be less than 1 megohm. Motor insulation resistance measuring steps are as follows:(1) will be Motor vehicle six joint apart for the end of the motor terminal box.The megohm flat (2),the first not wiring,shaking megohmmeter.Whose hands should be pointing to the "up",then "l" on the table (line) and "e" two wire (ground) Column with a line of nipple,slowly shaking the handle,whose hands should be pointing to "0".(3) measure the resistance between one of the three-phase winding motor.Two tests will receive any two phase winding,on both sides of the head,flat table,at rotor balancing machine 120 revolutions per minute Whose hands

steady speed shake megohmmeter a minute later,read the indicated value.(4) with the same method of measurement of each phase in turn around the casing with insulation resistance value.But should pay attention to,it says on the table "e" or "ground" terminal,should be received chassis Where there is

no insulation.