The Application of Travelling Wave Fault Locators in China

At present there are more than 1500 TWFL equipments in operation in China. The fault location accuracy obtained with TWFL equipment in practice has been better than 500 m. The TWFL systems and the methods of detecting the travelling waves used in China are described. Some typical fault location results from high voltage AC and DC transmission lines are presented. The "seamless recording" of transient signals to ensure the capture of fault transients during severe thunderstorm activity is introduced. The application of TWFL to distribution lines is also described.