| Title |
A Modelling Method of a High Impedance Fault in a Distribution System as a Voltage Source using EMTP |
| Authors |
강용철(Kang, Yong-Choel) ; 남순열(Nam, Soon-Ryul) ; 박종근(Park, Jong-Keun) ; 장성일(Jang, Sung-Il) |
| Keywords |
High impedance fault ; Voltage-current characteristics ; Voltage source ; Nonlinearity ; Asymmetry |
| Abstract |
A more reliable algorithm for detecting a high impedance fault (HIF) requires fault currents at the relaying point containing information of load condition as well as HIF characteristics. This paper presents a modeling method of an HIF in a distribution system using EMTP. From the voltage and current waveforms of HIF experiment, the voltage-current characteristic is obtained and then piecewise linearized. The proposed method gets several points on the linearized voltage-current curve and then represents nonlinearity as piecewise linear resistances using Transient Analysis of Control Systems (TACS) in EMTP. Thus, an HIF is represented as a voltage source in the first and third quadrants of voltage-current plane. The method is implemented in EMTP and thus the voltage and current at the relaying point can be obtained when an HIF occurs. In this paper, an HIF was simulated on various load conditions and fault conditions in 22.9 [kV] distribution systems. |