Using instantaneous values for estimating fault locations on series compensated transmission lines

Fault location estimation hitherto is based on using the filtered rms values from both ends of the line. In this paper, a new method for locating faults on series compensated high voltage transmission lines, based on the instantaneous values is proposed. Based on the results achieved with the algorithm previously published, using instantaneous values, the distance to fault location is estimated very accurately. However, the accuracy of the fault location is limited to the ability to capture data samples before the operation of the metal oxide varistor (MOV). The proposed algorithm incorporates special techniques to avoid the limitation caused by the operation of MOV. It is formal that although the accuracy of fault location using the algorithm proposed is slightly reduced, but still acceptable. This paper describes the new algorithm and examines its accuracy as compared to the paper previously published by these authors. (C) 2005 Elsevier B.V. All rights reserved.