Power Factor Improvement.doc (Size: 1.04 MB / Downloads: 257)
This article is presented by:
SHABEER ALI O.V MOHAMMED BISHRU N
Power Factor Improvement
The aim of this technical report is to introduce a summary for a study done for Al-Ameen Engineering College for power factor improvement. This report includes an electrical engineering background about the problem of power factor, including: the causes, the consequences, the economical importance for the energy saving for our college and for the Kerala State Electricity Board as well, and the theoretical solution for solving that problem.
The report links the theoretical solution with the real applicable solution through the study done by our project team for energy planning. This study includes a six months research done by our team, which represents an ideal methodology for solving this problem starting from defining the magnitude of the power factor problem until designing the equipment that can solve that problem.
The report represents all the points in simple terminology, according to the objectives of the electrical engineering degree course.
1.1 What Is Power Factor
Power Factor is the ratio between the real (kW) and apparent power (kVA) drawn by an electrical load. It is a measure of how effectively the current is being converted in to useful work output and a good indicator of the effect of the load current on the efficiency of supply system. Poor power factor results in increase load current draw that causes additional losses in the supply and distribution systems.
Power Factor (pf) =
Resistive devices, like electric resistance heaters and incandescent lights transform all the power supplied to the device into heat or useful energy. Inductive devices, like motors, use some of the power supplied to the device to energize the inductive windings and create a magnetic field. This power, called reactive power, is alternately stored and given up by the windings, but is not used to do actual work. When this happens, the line supplying power to the device now carries the actual power used by the device and the reactive power created by the device.
Actual power used by the device is measured in kW, reactive power created by induction devices is measured in kVAR, and the apparent power in the supply lines is measured in kVA.