Mohsen Ghalei Monfared zanjani - post graduate student ,Iran, Shahid Beheshti University(SBU)
Hosein Kazemi Kargar - Iran Shahid Beheshti University(SBU),
Mina Ghalei Monfared zanjani - Iran,Zanjan University

This paper proposed a new algorithm for High Impedance Fault (HIF) detection using PhasorMeasurement Unit (PMU). This type of faults is difficult to detect by over current protection relays because of lowfault current. In this paper a new method based on PMU is proposed which is sensitive to the change of currentphasor. The phasors are measured PMU to obtain the square summation of errors. Two types of data are used forerror calculation. The first one is sampled data and the second one is estimated data. The estimated data isobtained by phasors which explained in paper in detail. The verification of the proposed method is done by EMTP.

fault detection , high impedance fault, phasor measurement units