CABLE TROUBLESHOOTING WITH REFLECTO-METERS:DIAGNOSIS AND PRECISE PINPOINTING OF DEFECTS AND FAULTS IN LAID CABLES AND CONDUCTORS
■An underground cable is an electric line laid in the ground with particularly durable insulation on the outside, i.e. the cable sheath, which prevents its destruction due to chemical influences in the soil or small animals (rodents) living in the ground.
Underground cables have several advantages in comparison to overhead lines. They're protected against damage - including weathering - and they don't visually disrupt the landscape. Disadvantages include higher maintenance costs and greater difficulty in localizing faults, such as those caused by construction work and unintentional damage to cables laid underground. The higher costs associated with these factors are disadvantageous in power engineering applications in the high-voltage range.
■In the telecommunications sector, local connection cables are pressurized to a level of 10 mbar.
■As a result of this overpressure, air is blown against any infiltrating moisture in the event of minor leaks in the cable sheath, so that no moisture can penetrate. In the event of a pressure drop, a sensor indicates that air is escaping from the system. The cable is then pumped up with a special gas, making it possible to pinpoint the leak with the help of detection equipment.
●FAULT SOURCE DETECTION
■The goal of fault source detection is to identify broken or pinched cables and pinpoint fault location. The properties of time domain reflectometry are taken advantage of to this end, in order to detect any changes which take place within the medium. TDR can be used to localize the end of the cable, a cable break or a short-circuit between the inner and outer conductors.
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Technical Documentation |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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