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Case Studies

An Off-Line CableCARE® study of a 34.5 kV cable in a 20 year old petrochemical plant showed high tan delta for one phase. Partial Discharge testing showed a severe defect at 670 metres. When excavated, a joint was seen to be overheated & distorted, along with indications of water ingress. This cable was on the verge of failure & would have led to a complete plant shutdown.

One phase of a freshly laid 33 kV cable in a refinery failed during commissioning. Regular tests were unable to determine the location. Off-Line CableCARE® showed the fault to be at 1.59 kms. Based on this, the cable was excavated and the fault confirmed.

An Off-Line CableCARE® study of a 11 kV cable in a 30 year old fertilizer plant showed high tan delta for one phase. TDR testing showed a severe defect at 450 metres. When excavated, it was seen that the jacket & armour were both damaged and the underlying screen & insulation were exposed. Failure of this cable would have stopped a critical plant section.

One phase of a sub-sea cable failed during operation, leading to loss of redundancy at a critical oil drilling platform. Due to the long length, all tests failed to determine the location. Off-Line CableCARE® showed the fault to be at 3.77 kms. Based on this, the cable was excavated and the fault confirmed.

Off-Line CableCARE® had detected weak joints (high PD) during a new plant installation. Due to paucity of time, these could not be replaced. On-Line CableCARE® showed that the partial discharge in these joints could be easily detected & monitored. This is allowing the plant to continue plant operation without any worry for unexpected failure.
During a routine On-Line CableCARE® survey in a power plant, high local PD levels in the terminations were encountered. The levels were high enough to be considered alarming. Physical inspection did not indicate any problems. Four months later; the cable termination failed leading to a plant breakdown. Close trending of the PD levels would have prevented such a failure.