Cover Story

Determining Fault Location on Transmission and Distribution Lines

Since fault locating was introduced as an available feature in digital relays in the early 1980's it has grown to become and expected function of line and distribution protection relays. As a matter of fact, if a line protection relay was introduced to the market today without fault locating it would very likely be a total failure. Although we as an industry have accepted and actually expect fault locating to be a useful and accurate function of digital relays, fault locating had a rather rough start when it was first introduced. Early users were very skeptical and sometimes it required a leap of faith to apply and actually believe that the location provided was indeed accurate and useful. Over time, users found fault locating to be not only a useful feature, but one that resulted in cost savings by reducing line patrol time when restoring service to outaged transmission lines. More

Relion advanced protection & control.
BeijingSifang June 2016