| Title |
A New Protective Relaying Algorithm for Power Transformer Based on Three Phase Voltage and Current |
| Authors |
김상태(Kim, Sang-Tae) ; 이승재(Lee, Seung-Jae) ; 강상희(Kang, Sang-Hee) ; 진보건(Jin, Bo-Gun) ; 윤상현(Yoon, Sang-Hyun) ; 이태성(Lee, Tae-Sung) |
| Keywords |
Protective relay ; Power transformer Protection ; Differential relay |
| Abstract |
The two criteria to identify the disturbances of the power transformer has been reported in this paper. They have been derived through EMTP simulations of internal faults, inrush and overexcitation for the model of 154/22.9[kV], 40[MVA], Y-Y three-phase power transformer. We propose the crisp algorithm which uses two criteria. A series of test results clearly indicate that the method can identify not only an internal fault but also the other transients. The average of relay operation times is about 7.2[ms]. The proposed algorithm immunes to the transient state. |