| Title |
A Digital Distance Relaying Algorithm using a Wavelet Transformation |
| Authors |
강상희(Kang, Sang-Hee) ; 이주훈(Lee, Joo-Hun) ; 남순열(Nam, Soon-Ryul) ; 박종근(Park, Jong-Keun) |
| Keywords |
Digital Relay ; Distance Relay ; High Speed Relay ; Wavelet Transformation |
| Abstract |
A high speed digital distance relaying algorithm based on a Wavelet Transformation is proposed. To obtain stable phasor values very quickly, first, a lowpass filter which has low cutoff frequency is used. Secondly, db2(Daubechies 2) Wavelet which has the data window of 4 samples is used. A FIR filter which removes the DC-offset component in current relaying signals is applied. In accordance with a series of tests, the operation time of the relaying algorithm is less than 3/4 cycles after faults in a 80 [km], 154[kV], 60[Hz] over-head transmission line system. |