Fault location based on travelling waves

Travelling wave methods of fault location for both underground power cables and overhead power lines have been reported since 1931. Currently few, if any, of the travelling wave overhead line fault location methods which have been reported over the last 60 years are still in service, with only one Type C instrument being available commercially. The authors present results obtained using Type A and D methods from which it is concluded that simple, reliable and accurate fault locators can now be produced using modern micro-electronic technology. The new fault locators can function simultaneously as Type A and D systems. Furthermore the prohibitively high costs of previous implementations have been reduced for both the hardware and, especially, the installation and maintenance