| Title |
Measured Analysis of Leading Power Factor Characteristics Considering Harmonics in Apartment Electrical Systems |
| Authors |
안창환(Chang-Hwan Ahn) ; 이강희(Kang-Hee Lee) |
| DOI |
https://doi.org/10.5370/KIEE.2026.75.7.1648 |
| Keywords |
Leading Power Factor; Harmonic Current; Power Quality; True Power Factor; Displacement Power Factor |
| Abstract |
This paper analyzes the power factor characteristics of apartment building electrical systems under harmonic conditions based on field measurement data. Long-term continuous measurements of voltage, current, power factor, and current harmonics were conducted at the transformer primary and secondary sides, low-voltage distribution panels, and circuit breaker levels to analyze time-dependent characteristics. The results show that excessively leading power factor conditions were continuously observed over a 24-hour period at most measurement points, while current harmonic distortion levels exceeding international standards were simultaneously measured. In particular, as harmonic components increased, a discrepancy between the displacement power factor and the true power factor occurred, indicating that conventional power factor indices based on displacement power factor alone are insufficient to adequately explain the power quality characteristics of apartment building electrical systems. These results indicate that the electrical systems of apartment buildings are facing very high levels of risk, and that the establishment of comprehensive power factor evaluation methods and rational management criteria that consider harmonic effects is urgently required. |