| MVG 5: Sheath Fault Prelocation |
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A pre-location of sheath faults in power and communication cables helps to reduce both the total fault location time and the thermal stress on the cable. Here, TDRs (Time Domain Reflectometer) cannot be applied, since the pulses are largely dampened by the ground. These faults can best be pre-located employing bridge methods. Conventional bridge testers, however, are not suitable since on one hand a test voltage up to 5 kV DC is required and on the other hand a balance bridge circuit is not available. The high voltage bridge tester MVG 5 has a test voltage of up to 5 kV and is fitted with special components for bridge balancing. The components available for the pinpoint location as the burn down unit BT 500-IS-1 or MMG 5 and the earth fault locator ESG 80-2 have dual use, making this combination extremely cost-effective. The ESG 80-2 is used as a highly sensitive galvanometer and can be conveniently stored in the housing of the MVG 5. A protective flap with micro switch avoids contact with parts under high voltage. The following units can be used as high voltage source for the MVG 5:
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