Method and system for predicting the temperature of high voltage cable conductor

Abstract

The invention relates to a method and system for predicting temperature of a high voltage cable conductor. The method includes that a coefficient matrix model for predicting the temperature of cable conductors is established through utilizing the given cable structure data and a transient thermal path model; the matrix is assigned by cyclic assignment when forming a coefficient matrix, and then the eigenvalues and eigenvectors of the matrix are evaluated after forming the coefficient matrix; an integral function model is established according to the eigenvalues and eigenvectors, and then the integral function model is integrated to obtain a conductor temperature prediction model; the current value of the high voltage cable conductor is tested, and then the predicted temperature of the conductor is obtained through integrating by utilizing the conductor temperature prediction model and the predict moments and the electric current. The technology of the method and system for predicting the temperature of the high voltage cable conductor have important guide function in improving the cable carrying capacity, which have the advantages of improving load rate, achieving the purpose of cable capacity increase on the premise of ensuring the life of the cable.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method and system for predicting the temperature of a high-voltage cable conductor. Background technique [0002] With the rapid development of the urban economy, the demand for loads increases rapidly, and even power rationing measures are required during peak loads. The urban power supply network is already facing a transmission bottleneck, but at the same time, the power supply capacity of high-voltage cables has not been fully utilized. [0003] In practical applications, the load rate of high-voltage cable transmission lines is very low. For example, after investigation, it is found that the load rate of cables with voltage levels of 110kV and above in some areas is less than 30%, and some are even lower than 10%. The load factor is close to 50%. With the demand for electricity is growing at a rate of 10% per year. At the same time, overhead transmission lines wi...

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Problems solved by technology

[0006] Based on this, it is necessary to provide a high-voltage cable conductor temperature prediction method and system for the problem that it is difficult to accurately predict the temperature of the cable conductor, so as to achieve the purpose of increasing the load rate and realizing cable capacity increase under the premise of ensuring the cable life

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