The electrical high-pressure testing of cables and the localization of faults

The electrical high-pressure testing of cables immediately after the installation is completed, is discussed. The author concludes that a high-pressure direct-current test is useful and fulfils ordinary requirements. Routine testing with the view of ascertaining the condition of the installation by means of dielectric loss tests and high-tension direct-current insulation tests is shown to be of little value. It is thought that a high-tension direct-current pressure test might be useful in exposing incipient faults. A new connection for a high-pressure direct-current testing set is described. Methods of localization of the more difficult kinds of faults are given. These show that there are very few faults which cannot be fairly accurately located.