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Assessment of underground cable ratings based on distributed temperature sensing

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3 Author(s)
Li, H.J. ; SP PowerGrid Ltd, Singapore ; Tan, K.C. ; Qi Su

Numerous power utilities have installed advanced distributed temperature sensing (DTS) systems to measure the temperature of underground cables. This paper presents a general procedure for real-time assessment of underground cable ratings based on DTS. After the identification and location of hot spots on a cable, the cable installation data, load, and DTS-recorded temperature over a period of time are used to estimate soil thermal parameters and assess cable ratings under normal and overloading conditions. In order to accurately estimate soil thermal parameters, a combined technique of the finite-element method and gradient-based optimization is used. The technique was validated in the laboratory and applied to a rating assessment of a 230-kV/500-MVA cable circuit. The assessed continuous and emergency ratings are helpful in improving the operation of this circuit

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Power Delivery, IEEE Transactions on  (Volume:21 ,  Issue: 4 )