Power Factors

A power factor determines the amount of line current drawn by the motor. A high power factor is desirable because it is important in reducing line losses and minimizing power costs. A lower power factor means that the unit is not operating as efficiently as it should. Oversized motors tend to have low power factors. Typically, a NEMA D has a power factor of 0.87 when fully loaded, but decreases to 0.76 at half load. Usually, units must operate at a power factor of greater than 0.80 to avoid penalties from the power companies; thus, optimization of the pumping unit’s size and motor needs to be considered as the well-fluid volume changes.

Using capacitors can increase power factors. To determine if and how much capacitance is needed, determine the power factor of an installation upon initial startup and then decide if a correction is justified. If a pumping-unit motor has a low power factor, a capacitor can be placed between the motor and disconnect.

JBK Electric, will only install KVAR EC on the load side of the motor starter and before the thermal overloads will not be modified to avoid any motor warranty issues.

As an additional benefit, we will perform an electrical safety infrared scan on the panel where your KVAR unit is installed.  This will help detect any faulty wiring, breakers, or mechanical failures that have occurred.  For more information on our scans please click here.