The megger test is a method of testing making use of an insulation tester resistance meter that will help to verify the condition of electrical insulation.
Motor insulation resistance test report format.
A if the insulation resistance of a new cleaned or repaired motor that has been stored for some time is less then 10 mω the reason might be that the windings are humid and.
Historically many field electricians use the somewhat arbitrary standard of 1 megohm per kv.
Figure 3 typical scale on the megger insulation tester.
Reverse side of card at right is used to record the test data.
Also acceptable values of insulation resistance depend upon the equipment you re testing.
Regular checks of motor insulation resistance the key to prolonging the life of any electrical device is periodic checks maintenance the insulation resistance of stored and active motors should be checked regularly.
Insulation resistance quality of an electrical system degrades with time environment condition i e.
Insulation resistance testing purpose.
Figure 4 typical record of insulation resistance of a mill motor.
The insulation resistance is the resistance in ohms of wires cables and electrical equipment.
During the measurement and immediately afterwards some of the terminals carry dangerous voltages and must not be touched.
Continuity test report insulation resistance test form ir test sheet test sheets post navigation battery autonomy test report for fire alarm system testing commissioning report smdb.
The international electrical testing association neta specification maintenance testing specifications for electrical power distribution equipment and.
Curve a shows test values as measured.
The test measures the insu lation resistance between the phases and or between phase and ground.
Temperature humidity moisture and dust particles.
Power distribution equipment testing circuit tracing electrical survey panel schedules digital and affixed color coded labels affixed to.
Z 5 date of test r eading in megohms the graph below shows an example of the insulation resistance readings on an electric motor.
It is important to guard against electric shocks and avoid equipment damage from accidental discharges.
Dc voltage of 500 or 1000 v is applied between the windings and the ground of the motor.
Insulation resistance testing is a non destructive test procedure.
It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs.
At a the insulation resistance decreases due to aging and dust accumulation.
Ground insulation test of a motor.
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The measurement of insulation resistance is carried out by means of a megohmmeter high resistance range ohmmeter this is how the test works.
