Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 2009.07a
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- Pages.239_240
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- 2009
An analytical study on the Effect of High impedance Transformer to reduce Distribution Fault Current
변압기 임피던스 증가에 의한 배전계통의 고장전류 저감방안의 영향분석
- Lee, Hyun-Chul (Green Net Power Co) ;
- Lee, Geun-Joon (Chung-Buk Provincial Collage) ;
- Hyun, Ok-Bae (KEPRI) ;
- Hwang, Si-Dol (KEPRI)
- Published : 2009.07.14
Abstract
This paper presents the brief analytical study on 돋 effects of higher impedance transformer(HIT) to reduce distribution system fault current. With the increase of source and load capacity of power system, fault current of D/L is much more increased and, conventional protection equipment-such as sectionalizer and recloser, have to be replaced higher switching capacity. However, this replacements needs a lot of budget to utility. Increase of transformer impedance is can be a countermeasure in practical basis. This paper compares the voltage and fault current magnitude of both cases -%Zt=20% and %Zt2=33.3%(transformer capacity is 75/100MVA). The simulation results show that the steady state voltage of HIT is dropped 5~6% more in peak load, and fault current was decreased about 5kA by high impedance on transformer.
Keywords