Cable Fault Analysis : 5 Case Studies - Heat Shrink Cable Joints & Cable Terminations

By Chris Dodds on 8th September, 2014

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HV Cable Joints & Cable Terminations - Cable Fault Analysis.

T&D have an obligation to investigate any cable joint or cable termination product failure, but over the years we have been asked more and more to get involved in general cable failure analysis for high voltage HV networks.

T&D undergo un-biased investigations into any failure involving high voltage cable joints and cable terminations regardless of manufacturers or whether heat shrink or cold shrink type.

Below are 5 case studies covering Cable Fault Analysis linked to the cable jointing and terminating of high voltage power cables. Click on the links for more information on each study.

Case 1: An 11kV 3 Core Transition Cable Joint Which Was Audibly Discharging

Cable Joints - 11kV 3 Core Transition Joints

Case 2: High Voltage Cable Joint Failure On 11kV Trifurcating Transition Joint

Case 2: High Voltage Cable Joint Failure On 11kV Trifurcating Transition Joint

Case 3: An 11kV Heat Shrink Transition Cable Joint Failure

Case 3: An 11kV Heat Shrink Transition Cable Joint Failure

Case 4: Problems Of Cable Joint Earth Continuity On Low Voltage Feeder Cable

Case 4: Problems Of Cable Joint Earth Continuity On Low Voltage Feeder Cable

Case 5: "Buzzing" 11kV Cable Box Terminations On XLPE 3 Core Cables

Case 5:

Your Comments

Cable jointing by untrained and unorthodox cable jointers is one of the biggest causes for the failure of the cable joints. In some cases, improper preparation of cables and usage of incorrect materials also causes cable failures. Another cause for the failure of cable joints specially in the case of HV Cables can also be incorrect earthing at the ends and not using cross bonding of the sheath. By Sasikumar Vasudevan Pillai (Raychem Ltd - Business Development & Technical Services).

As is usually the case, these cable faults are basically down to cable jointer error. Is this a lack of training, a lack of understanding of the process and the significance of the various elements, or a lack of supervision (by people who know what they are doing? The difference between a doctor and a cable jointer is that a doctor buries his mistakes - a jointer digs his up! By Chris Tigwell (Scottish Power - 33kV Substation Design Engineer).

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Category:  HV Cable Jointing & Terminating

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