Motor Insulation Resistance Test Iec Standard

Cables for rated voltages of 1 kv um 1 2 kv and 3 kv um 3 6 kv reference number iec 60502 1 2004 e international standard iec 60502 1 second edition 2004 04.

Motor insulation resistance test iec standard.

The measurement of insulation resistance is carried out by means of a megohmmeter high resistance range ohmmeter this is how the test works. Curve b shows same values corrected to 20 c see page 22 giving a definite downward trend toward an unsafe condition. The intent of the iec standard is to specify test methods that assure a given stator insulation design can prevent formation of pd in new windings and continue to suppress pd throughout the life of the motor type i insulation. The sharp fall at b indicates there was an insulation fault.

At c the fault has been repaired rewinding of the motor so the insulation resistance has returned to. As per ie rules 1956. See the site fixed equipment for measurement and testing of electrical networks energy management and optimization systems. 1 magnet wire at high stress in air voids b.

Figure 4 typical record of insulation resistance of a mill motor. During the measurement and immediately afterwards some of the terminals carry dangerous voltages and must not be touched. The results obtained from ir test are not intended. Curve a shows test values as measured.

One meg ohm rule for ir value for equipment. The measurement of insulation resistance is a common routine test performed on all types of electrical wires and cables. At a the insulation resistance decreases due to aging and dust accumulation. At a pressure of 1000 v applied between each live conductor and earth for a period of one minute the insulation resistance of hv installations shall be at least 1 mega ohm or as specified by the bureau of indian standards.

1k v 1 mω minimum 1kv 1 mω 1kv. 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. Ground insulation test of a motor. Testing and inspection environmental measurements laboratory instrumentation power and energy.

Based upon equipment rating. Reverse side of card at right is used to record the test data. Figure 3 typical scale on the megger insulation tester. Portable measurement equipment in a wide variety of fields.

The graph below shows an example of the insulation resistance readings on an electric motor. Power cables with extruded insulation and their accessories for rated voltages from 1 kv um 1 2 kv up to 30 kv um 36 kv part 1. 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.