Temperature Inversion and Dynamic Capacity Enhancement of High-voltage Cable Conductor Under Horizontal Pipe Jacking Laying
Horizontal pipe jacking is generally used in situations where cable lines cross rivers,streets,and so on.Due to its special structure,the cable temperature measurement optical fiber is difficult to lay close to the cable skin,resulting in poor real-time and accuracy of temperature measurement when using optical fiber alone.In this point of view,a temperature measurement scheme combining a cable end skin thermometer and an optical fiber thermometer placed in an adjacent PVC empty pipe is proposed,and the corresponding core conductor temperature inversion and dynamic capacity enhancement methods are proposed.The cable core and cable skin are modeled as equivalent heat sources and heat sinks respectively,and the other parts in the cable are modeled using equivalent thermal circuits.The thermal circuit parameters are inverted based on the temperature measurements of the optical fiber and skin.The Laplace transform method is used to solve the thermal circuit model,inverse the real-time temperature of each phase cable core and predict the allowable duration of emergency loads for dynamic capacity enhancement.By comparative comparisons with the finite element results,the accuracy and fast convergence speed of the proposed model and method in predicting the emergency load duration are confirmed.
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