| Title |
A Study on the Reverse-Power-Flow Phenomenon due to Transformer Wiring Types in Distribution System |
| Authors |
Dong-Yeol Shin ; Bok-Nam Ha ; Won-Wook Jung ; Han-Ju Cha |
| Keywords |
Distributed Generation System ; OCGR Trip ; Metering Errors ; Fault Event |
| Abstract |
As the penetration of distributed generation systems is recently high, there have been metering errors, trips of protective devices in KEPCO distribution systems including an occurrence of false fault-indicator in distribution automation system. The cause of malfunctions was the reverse-tower-flow phenomenon due to transformer wiring types. By the effect of the reverse-power-flow, each of phase"s fundamental currents was added by about 3 times on the neutral line. A new method based on the analysis of the reverse-power-flow is proposed in this paper. Fault currents on each section were analyzed by the proposed method, and the effect of types of transformer wiring was examined experimentally. In order to reduce the malfunctions due to the reverse-power-flow, controlling the zero-sequence impedance of transformer was designed and verified by using PSCAD/EMTDC software. |