Browse > Article

A Study on the Characteristics for Power Capacitor under the Voltage Unbalance Operation  

Kim, Il-Jung (호서대학교 벤처대학원)
Kim, Jong-Gyeum (강릉대학교 전기정보통신공학부)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers P / v.57, no.1, 2008 , pp. 36-40 More about this Journal
Abstract
Most of the low-voltage feeder are designed with approximately balanced and connected at the three phase four wire systems. However, Most of the power distribution systems' load which is composed of single or three phase are unbalanced by generating load unbalance. Unbalanced current will draw a highly unbalanced voltage. The power factor of an induction motor at rated operation is between 25 and 90%, depending on the size and speed of the motor. However, many induction motors operate below the nominal rating, resulting in poor power factor. This condition needs power factor improvement. Addition of power capacitor at the motor terminal may draw to stress due to voltage unbalance. This paper presents operation characteristics on steady states of a three-phase induction motor under unbalanced voltages with power capacitor. The existence of voltage unbalance have an effect on stress of power capacitor.
Keywords
Voltage unbalance; Power capacitor; Reactive power; p-q theory; Induction motor;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Akagi, H et al., "Instantaneous reactive power compensators comprising switching devices without energy storage components", IEEE Trans on IA, Vol.20, no.3, pp.628-630, 1984
2 Ramasamy Natarajan, "Power Syatem Capacitor", Taylor & Francis, 2005
3 P. Pillay and M. Manyange, "Definitions of voltage unbalance", IEEE Power Eng, Rev. Mag., vol.5, pp.50-51, May 2001
4 H.W. Dommel, "Electromagnetic Transients Program. Reference Manual (EMTP Theory Book)", BPA 1986
5 김종겸 외 3인, "불평형 전압 운전시 유도전동기의 동작특성 해석", 대한전기학회 논문지, 53(B), No.6, pp. 372-379, 2004.06