| Title |
Actual Conditions of Voltage and Current Harmonics on Low-voltage Power Systems Supplying Various Facilities |
| Authors |
Bok-Hee Lee ; Young-Hwan Baek |
| Keywords |
Voltage harmonic ; Current harmonics ; Series reactor ; THD ; TDD ; Harmonics compensation |
| Abstract |
This paper presents the actual conditions and reform measures of voltage and current harmonics being made in low-voltage power systems supplying various loads. The measurements were carried out at the secondary output terminals of 22.9[㎸]/380[V]/220[V] customer"s transformers, and the results were discussed on the basis of the comparison with IEEE and IEC harmonics control standards. The voltage THDs of the power systems employed in this survey were less than 5[%] that is considered to be acceptable. On the contrary, the current distortions were significantly greater than the voltage distortions, and the current THDs were distributed over the wide-range from 15.7 to 60.4[%]. In particular, the current distortion on the low voltage power lines of office buildings in which many PC and fluorescent lamps are used is remarkably more serious than that of factory facilities. As a result, the voltage distortion factors are observed within the range of its allowable level or less than the limits, but the current distortion factors are significantly greater than the limits of IEEE and IEC standards. |