Non-Destructive Testing & Cable Fault Locating with High-Voltage Direct Current

CIM Bulletin, 1965

Harold N. Miller Vice-President, Engineering, Associated Research, Inc., Chicago, Illinois

Lost time and services caused by electrical equipment breakdown or cable faults can often be substantially reduced by the use of direct-current high-voltage testing as a maintenance tool. This paper discusses the relative merits of alternating-current versus direct-current testing, pointing out the advantages in size and cost of equipment and more definitive results achieved through the use of D.C. General principles of direct-current high-voltage testing, types of testing, methods of performing the actual test and interpreting the results are explained. 'The value of insulation resistance measurements and their relationship to high-voltage testing is discussed. Pinpointing the physical location of a cable defect using a fault locator or thumper is described. Reference is made to several organizations that have effected considerable savings with high-voltage test programs.
Keywords: Cables, circuit breaker, insulation, leakage current, test set, voltage, Equipment, failures, Fault, Faults, Leakage, Resistance, test, Testing, Tests