Fault location by one-quarter wave length resonant method

摘要

Standard methods of locating faults in insulated cables are very well-known, particularly the use of the loop tests, Murray Loop and Varley Loop, etc., also comparative capacity tests for opens and comparative inductance tests for shorts. The above methods are very common, and wherever the faulty cable is paralleled by a good cable, such methods are the most accurate where tests are made from the ends of the cable and the distance to the fault must be computed. Wherever possible, of course, it is desirable to locate a cable fault to an exact spot by a test on the cable itself, but in many cases this is impossible for one reason or another. Where faulty cables are not paralleled by good ones, the testing has always been of a more complicated nature, and numerous methods have been proposed to accomplish the desired result.