A comparative study of high impedance fault in transmission line using distance relay

摘要

Current and voltage behaves like a fault during power swing condition. Distance relay which sense to operate due to change in impedance may be falsely operated in power swing. Therefore a power swing block is necessarily used in distance relay for security purpose to avoid mal-operation during power swing. During power swing all types of fault such as symmetrical, unsymmetrical and high resistance fault are simulated through PSCAD software to test this technique. This method is tested accurate and fast.