A Study on the Representation of Voltage Unbalance: Part II-Approximations of Voltage Unbalance Factor

전압불평형의 표현방식에 관한 연구(II) - 전압불평형계수의 근사적 표현방식 -

  • 정승기 (광운대 전자정보대 전기공학과)
  • Published : 2003.05.01

Abstract

In field applications, to represent the degree of voltage unbalance, the maximum voltage deviation from the average is preferred to the voltage unbalance factor based on symmetrical component analysis. This paper first clarifies the relationship between the voltage unbalance factor and the maximum deviation factor showing that the maximum deviation factor approximates the voltage unbalance factor under relatively low unbalanced conditions. Several alternative ways of approximation are introduced and examined by comparing with the conventional maximum deviation factor. It appears that these alternatives provide more accurate approximation to the voltage unbalance factor over wider range of voltage unbalance while maintaining simplicity in their formula.

Keywords

References

  1. IEC Standard 61000-4-27: Testing and measurement techniques Unbalance, immunity test, August 2000
  2. 저자, '전압불평형의 표현방식에 관한 연구(I) - 선간전압 크기에 의한 전압불평형계수의 표현', 대한전기학회 논문지 52권 5호, 2003년 5월
  3. IEEE Working Group on Nonsinusoidal Situations, 'Practical definitions for powers in systems with nonsinusoidal wavefprms and unbalanced loads: A discussion,' IEEE Trans. on Power Delivery, vol. 11, no. 1, January 1996