New accurate transmission line fault location equipment

The use of longer distance transmission lines coupled with demands for reduced circuit outage times is stimulating a requirement for reliable and accurate fault location methods. The need for very high accuracy is generally becoming more important since, in EHV power systems, there is often little visual evidence of a fault, and post-fault clearance tests performed at reduced system voltage can be inconclusive. In this paper, the results of simulation studies to determine the basic accuracy of new fault location methods are given. The authors conclude with a description of the hardware implementation of the fault location equipment that is currently under development