Influence of Poor Power Factor on the Cost of Electrical Energy Consumption and its Correction

  • M K Kawira
  • Ali Wako


The cost of power in a utility is increased by low power factor which reduces the efficiency of a system. The line losses cause low efficiency of the system. The cosine of cos angle ­Łťâ┬áwhich is between the voltage and the current gives power factor. Low power factor points to an inefficient load source that draws or non-working power which does not produce work. The power and energy logger, Power Energy Logger model (PEL) 103 was used to measure voltage, current, phase angles, harmonic distortions and power factor for various facilities. A fluke temperature gun was used for monitoring the power factor. The trend in power factor for buildings under construction was lower and nonsteady compared to buildings already under a predictable power load.┬áMonitoring of the power factor and its parameters was done for a period of six months.Analysis of cost of power consumed when power factor was low, showed that the efficiency of usage of electrical energy decreased. During a twenty-four period and a twelve-hour period a load factor of 0.4 and 0.31 respectively were obtained. The electrical power average cost was economical at 49.19 Ksh /k Wh compared to the marketprice of power consumed at a cost of 22.4 Ksh/k Wh. The high cost of power was due to the surcharges on low power factor.┬áThe passive power factor correction involving linear inductors and capacitors were used to improve the power factor from an average of 0.6 to 0.954.┬áThe improvement in efficiency of a system and devices when powerfactor was corrected led to energy saving, increase in available energy and savings on power bills.
Feb 19, 2020
How to Cite
KAWIRA, M K; WAKO, Ali. Influence of Poor Power Factor on the Cost of Electrical Energy Consumption and its Correction. Proceedings of Sustainable Research and Innovation Conference, [S.l.], p. 121-125, feb. 2020. ISSN 2079-6226. Available at: <>. Date accessed: 05 july 2020.