Locating faults in power cables

Power cable fault locating is at times difficult due to a high initial fault resistance or an increase of resistance during the time locating is in progress. A method using a constant current transformer for reducing high initial resistance and preventing its increase, in connection with a short circuiting switch to generate signals for locating the fault, is discussed in this article. A practical assembly of this type of apparatus for cable fault locating is described and operating directions are included.