Dynamic temperature estimation and real time emergency rating of transmission cables

Abstract

Abstract--This paper is concerned with the development of a fast computational methodology for dynamical estimation of the temperature in transmission cables solely based on current measurements and an enhanced version of the lumped parameters model, also denoted thermo electric equivalents (TEE). It is found that the calculated temperature estimations are fairly accurate -within 1.5 o C of the finite element method (FEM) simulation to which it is compared -both when looking at the temperature profile (time dependent) and the temperature distribution (geometric dependent). The methodology moreover enables real time emergency ratings, such that the transmission system operator can make well-founded decisions during faults. Hereunder is included the capability of producing high resolution loadability vs. time schedules within few minutes, such that the TSO can safely control the system. IndexTerms--Cables, transmission lines, dynamic temperature control, finite element methods, temperature prediction methods.

Lifetime estimation and performance evaluation for offshore wind farms transmission cables

“…Nowadays, there are mainly three modelling principles for estimation of the cable temperature dynamically: finite elements (FEM), step response (SR) -used by CIGRÉ-and thermoelectric equivalent method (TEE). A comparison between those methods has been done in [7] and [8], where it is remarked that TEE provides results which are within an acceptable range of the FEM simulations (nearly 1℃) with a considerable computation time reduction. TEE models also have proved to exhibit a correct estimation of the temperature as compared to real measured data in experimental tests, with deviations of around 3℃ [9].…”

Evaluation of Demand Response on System Reliability and Cable Aging

“…In order to calculate the temperature of the cable, Thermoelectric Equivalent (TEE) is used for its accuracy and low computational time for a large number of cables [12]. In TEE model, heat flow in the cable is calculated by representing it as current flow in an electric circuit.…”

“…On the other hand, Expected Equivalent Network Ageing is used for evaluating the aging of the network as the sum of each cable Expected Equivalent Cable Ageing (EECA) in the network. EECA is calculated by (12) where ECA is the equivalent cable aging at each interval. While the EENA is calculated by .…”

Optimization of Modular Wiring Harnesses by Means of Regression Models for Temperature Prediction of Wire Bundles

“…Furthermore, worldwide car sales demand extra customization capabilities for car manufactures to offer specific features of their models adapted for each continent. In terms of magnitude, the overall number of possible combinations of features of a car model can reach 10 10 . Different simulators have been developed to predict the temperature of wires or wire bundles in vehicle applications, with the aim of optimization.…”