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MVG 5

Bridge tester for sheath fault location in cables

Description
A prelocation of sheath faults in power and telecommunication cables prevents ageing, faults and the stress from faults that are a consequence of water ingress. Here the common TDR methods are not usable, since a conductive return via the earth is not existing. These faults can only be prelocated by using bridge technology. Conventional bridge testers, however, are not suitable since, since a test voltage up to 5 kV DC is required.

The high voltage bridge tester MVG 5-E has an input test voltage capability of up to 5 kV and is fi tted with the circuits for bridge balancing. The components available for the HV supply as listed below, and the earth fault locator ESG 80-2 have a dual use, making this combination effi cient and extremely costeffective. The ESG 80-2 is used together with the external HV supply as galvanometer part of the prelocation bridge and with the pulsed HV as step voltage probe for the pinpointing procedure. A protective cover prevents contact with high voltage carrying parts.