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http://dx.doi.org/10.5370/KIEE.2011.60.9.1651

A Study on the Calculation of Reference Impedances in Domestic Low-Voltage Power System  

Kang, Moon-Ho (한국전력공사 전력연구원)
Song, Yang-Hoe (지식경제부 기술표준원 정보통신표준과)
Lee, Heung-Ho (충남대학교 전기공학과)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.60, no.9, 2011 , pp. 1651-1655 More about this Journal
Abstract
The reference impedances which is about 95% supply impedance value of residential consumers' supply impedances was published by IEC in 1980. The reference impedances are the standard values for use in determining the voltage disturbance characteristics of electrical equipment like the flicker. In IEC 60725, the reference impedances for premises having service current capacities less than 100A per phase and for service current capacities more than 100A per phase are recommended. And these reference impedances are targeted for the countries using 50Hz power frequency. Because of the frequency difference, the reactance values of the reference impedances will be increased in 60Hz power system like Korea, And also the reference impedances are different significantly each other according to declared voltage variation, power consumption and service wire length etc. Therefore It is needed to calculate the reference impedances suitable for domestic low-voltage power system. In this paper, the reference impedances for service current capacities less than 100A in 220/380V, 60Hz single-phase two wire and three-phase four wire low-voltage system are calculated, And the equations for service current capacities more than 100A to calculate the modulus value of maximum supply impedances are suggested base on IEC 60725 and the reference impedances for those are calculated on service current of 100A per phase.
Keywords
Reference impedance; Supply network impedance; IEC 60725; Flicker;
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  • Reference
1 Yang-Hoi. Song, Moon-Ho Kang, et al., "저압 전기 기기의 고조파 영향 평가 및 방출 한계기준에 관한 연구", 최종보고서, pp. 167-189, 2008.
2 IEC 60725, "Considerations on reference impedances and public supply network impedances for use in determining disturbance characteristics of electrical equipment having a rated current $\leq75A$ per phase", IEC, 2005.
3 IEC 725, "Considerations on reference impedances for use in determining the disturbance characteristics of household appliances and similar electrical equipment", IEC, 1981.