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. Historically many field electricians use the somewhat arbitrary standard of 1 megohm per kv. The insulation resistance is the resistance in ohms of wires cables and electrical equipment.

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Figure 4 typical record of insulation resistance of a mill motor.

Motor insulation resistance test report format.

Temperature humidity moisture and dust particles. 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. 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. The method of measuring the insulation resistance is to test and assess the state of the isolation head and body.

At a the insulation resistance decreases due to aging and dust accumulation. Also acceptable values of insulation resistance depend upon the equipment you re testing. The measurement of insulation resistance is carried out by means of a megohmmeter high resistance range ohmmeter this is how the test works. Curve a shows test values as measured.

Insulation resistance quality of an electrical system degrades with time environment condition i e. 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. During the measurement and immediately afterwards some of the terminals carry dangerous voltages and must not be touched. Curve b shows same values corrected to 20 c see page 22 giving a definite downward trend toward an unsafe condition.

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. Insulation resistance testing purpose. Figure 3 typical scale on the megger insulation tester.

The international electrical testing association neta specification maintenance testing specifications for electrical power distribution equipment and. Templates test reports forms tags. Insulation resistance testing is a non destructive test procedure. The test measures the insu lation resistance between the phases and or between phase and ground.

Ground insulation test of a motor. Power distribution equipment testing circuit tracing electrical survey panel schedules digital and affixed color coded labels affixed to. It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs. Dc voltage of 500 or 1000 v is applied between the windings and the ground of the motor.

Reverse side of card at right is used to record the test data. Skip to content 516 536 2600 215 n main street freeport ny 11520.