Power Factor Calculations SoftwareThe Electrical Calculations software provides two methods of calculating the correct value of KVAR correction to apply to a motor. The first method requires the magnetizing current of the motor. Where this figure is available, then this is the preferred method. Where the magnetizing current is not available, the second method is employed and is based on the half load power factor and efficiency of that motor. These figures are available from the motor data sheets.
Motor A is a 200 KW 6 pole motor with a magnetizing current of 124A. From tables, the correction applied would be 37KVAR. From the calculations, this would require a correction of 68.7 KVAR
Motor B is a 375KW 2 pole motor with a half load efficiency of 93.9% and a half load power factor of 0.805, the correction recommended by the tables is 44 KVAR while the calculations reveal that the correction should be 81.3KVAR
Electrical Calculations is a shareware program which means that you can try it before you buy it. You can freely distribute copies to anyone you please, but if you find it to be useful, as I'm sure you will, then you must purchase it at $NZ35.00 Registered copies of Busbar will be eligible for continued updates, and registered users will be advised of all major upgrades as they become available.
Static Power factor correction can be calculated from known
motor characteristics for any given motor, either the magnetizing current
and supply voltage (method 1) or half load efficiency and half load power
factor(method 2), or, as a last resort, table values can be used. These
will almost always result in under correction.
Bulk PFC can be calculated from known existing power factor, required new powerfactor, line voltage and line current.
Click here to download Electrical Calculations including the power factor calculations.
The Purchase Price for Electrical Calculations is $NZ35 or $US22.
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