Title :
Assessment of underground cable ratings based on distributed temperature sensing
Author :
Li, H.J. ; Tan, K.C. ; Su, Qi
Author_Institution :
SP PowerGrid Ltd, Singapore
Abstract :
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
Keywords :
distributed sensors; finite element analysis; gradient methods; power cables; temperature sensors; underground cables; distributed temperature sensing systems; finite-element method; gradient-based optimization; hot spots identification; hot spots location; power utilities; soil thermal parameters; underground cable ratings; Circuits; Communication cables; Finite element methods; Parameter estimation; Power measurement; Soil measurements; Temperature measurement; Temperature sensors; Thermal loading; Underground power cables; Cable rating; distributed temperature sensing; finite-element method (FEM); hot spot; optimization method;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2006.874668
