Leading Power Factor With 6.6 KV Motors

Give description of motor(induction/synchronous etc) and type of starter.

6.6 KV BHEL make Induction motor 175 KW and 250 KW with VCB

check the connections to the meter, if ok, replace the meter.

Are mechanical loads of these motors completely independent from other motors' ? If not, check their actual slip vs rated. You may be surprised by a minus sign. S.M.

Just a thought: 1. Usually 6.6 KV loads for starting or stopping there would surge suppressors connected in parallel which consists of capacitors & Resistors. Check if any changes done recently. 2. The 6.6 KV motors do have capacitors fitted in the motor compartment, in case need to check any changes done. 3. What is the total load in KW, Amperes and actual voltage you would be able to workout your PF just to proof meters are reading correctly. Thanks.

What are the no-load currents and power factors of the motors? In general, in case of SQ. cage induction motor, the no-load current of the motor is restricted upto 40% of the full-load current of the motor.Also please check if capacitor banks are connected across the motor terminal for power factor improvement, the rating of the capacitor bank. Normally the capacitor bank rating would be maximum 90% no-load KVA of the motor. Next, by taking actual readings of KW consumption, Voltage acorss the motor terminal and current drawn by the motor actual power factor on-load can be calculated.

Thanks,

Manindra.