Nonunit protection technique for EHV transmission systems based on fault-generated noise. Part 3: Engineering and HV laboratory testing

The paper describes the various stages involved in the prototype hardware development and implementation of a new protection technique for EHV transmission lines; the fundamental principles, CAD design and performance evaluation using simulated results were described in Parts 1 and 2. The paper includes a description of the experimental setup at the National Grid Company, High Voltage Laboratories, Leatherhead (UK) and illustrates the performance of the prototype hardware when subjected to fault-generated high frequency signals obtained under arcing faults on the experimental rig