Heat Run Test Induction Motor Testing
In this test, the machine is coupled with an appropriate rotating equipment such as the pump, fan, compressor, etc. then the load is applied to the rotor.
All variable such as current, voltage, power, stator temperature, bearing temperature are measured at the start and also in each 30min based on the test procedure. A power analyzer and temperature device are used for measurements.
After thermal stabilization (bearing temperatures), the motor is stopped, and hot stator resistances is measured, and temperature rise is calculated based on following parameters:
- Cold state winding temperature
- Winding temperature at test end
- Coolant temperature at test end
- Cold state stator resistance between phases
- Stator resistance between phases at the end of the test
The stator temperature rise level shall be verified based on acceptance criteria addressed in the induction motor routine testing protocol /test procedure. This test is a key test in the induction motor testing.
EQUIPMENT:- Voltmeter, Clamp meter, 2 thermometer, 2 thermocouple etc
EQUIPMENT:- Voltmeter, Clamp meter, 2 thermometer, 2 thermocouple etc
FORMULA
winding temperature rise
=R1/R2(234.5+T1)-(234.5+T2)
Where
R1- Resistance before starting
R2- Resistance end of testing
T1- room temperature before starting
T2- room temperature end of testing
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Milan Tomic
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Very useful post for maintenance engineer👍🏻
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