The international electrical testing association neta specification maintenance testing specifications for electrical power distribution equipment and.
Motor insulation resistance test report format.
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.
The measurement of insulation resistance is carried out by means of a megohmmeter high resistance range ohmmeter this is how the test works.
Figure 4 typical record of insulation resistance of a mill motor.
Curve b shows same values corrected to 20 c see page 22 giving a definite downward trend toward an unsafe condition.
It is important to guard against electric shocks and avoid equipment damage from accidental discharges.
At a the insulation resistance decreases due to aging and dust accumulation.
Templates test reports forms tags.
Curve a shows test values as measured.
Also acceptable values of insulation resistance depend upon the equipment you re testing.
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The test measures the insu lation resistance between the phases and or between phase and ground.
The insulation resistance is the resistance in ohms of wires cables and electrical equipment.
Insulation resistance quality of an electrical system degrades with time environment condition i e.
During the measurement and immediately afterwards some of the terminals carry dangerous voltages and must not be touched.
Insulation resistance testing purpose.
Temperature humidity moisture and dust particles.
Insulation resistance testing is a non destructive test procedure.
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.
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Historically many field electricians use the somewhat arbitrary standard of 1 megohm per kv.
It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs.
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.
Figure 3 typical scale on the megger insulation tester.
Ground insulation test of a motor.
The method of measuring the insulation resistance is to test and assess the state of the isolation head and body.
