What is a loopback cable
The detection and localization of cable fault is a major time consuming factor in the regular maintenance aspect. Digging operation by other public utility authorities and individual public.Ħ DETECTION AND LOCALISATION OF CABLE FAULT Natural causes and accidents :- Due to termites, rodents borers etc., & due to earth quack, floods, penetration by tree roots, contact with power lines etc. Faulty materials in manufacturing of the Cable Bad constructional practices like in-efficient, nonstandard and careless work-man ship, specially during the time of laying & jointing of cable. Inter-crystalline fracture :- Sheath is effected due to mechanical stresses, longitudinal, transverse, tensional oscillation or periodical variation of temperature or repeated overheating of the sheath. Foreign potential: The existence of potential, even when the circuit is idle or isolated from the potential of exchange and subscriber premises equipment is foreign potential or contact of the conductor with other circuit having potential.ĥ FAULTS OCCUR DUE TO Corrosion :- Chemical and electro chemical action, which damages the outer sheath and the conductor of the cable. Short Circuit Fault: When the resistance between the wires or between the conductors becomes very low, even without any loop in the circuit on the pairs.
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Disconnection Fault :: When the Conductor is cut then the fault is called break fault or is called High Resistance fault.Ĥ Contd. Low insulation fault:: When the insulation between conductors in the cable or between the pairs or between pair and earth falls below a prescribed limit (normally 0.5 meg ohm) This may be due to entry of moisture or due to failure of wire insulation. One cable fault normally affects a large number of circuits.Įarth fault:: When the insulation between the earth and the conductor in the cable becomes very low. the primary, secondary and distribution cables, cabinets, pillars, DPs etc.
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2 The efficiency of the maintenance of external plant largely depends on the proper planning, execution, constructional practices and maintenance of cable network i.e.