Method and device for determining core temperature of cable group and installation method of the device

Abstract

The invention discloses a method and device for determining the core temperature of a cable group based on distributed optical fiber temperature measurement, and an installation method for the distributed optical fiber temperature measurement device. The method for determining the temperature of the cable group includes: measuring the environmental parameters of the cable group and the cable The cable parameters in the group; and the cable group model established according to the environmental parameters and cable parameters; read the current of the cable group conductor, perform the simulation calculation of the estimated temperature of the cable skin according to the cable group model, and obtain the first cable in the cable group Estimated skin temperature Tc; measure the actual skin temperature Tb of the first cable in the cable group in the axial direction; calculate the conversion coefficient α through the estimated skin temperature Tc and the actual skin temperature Tb; Correct the estimated temperature and calculate the actual temperature of the skin of each cable in the cable group. The method and device provided by the invention can improve the calculation accuracy of the cable group temperature and increase the calculation range of the cable group temperature.

Description

technical field [0001] The invention belongs to the field of cable temperature evaluation of power cable equipment, and in particular relates to a method and device for determining the core temperature of a cable group based on distributed optical fiber temperature measurement, and an installation method for the distributed optical fiber temperature measurement device. Background technique [0002] With the development of society and economy, the power load in urban centers is increasing, and the requirements for power supply reliability are also getting higher and higher. In addition, overhead cables will cause visual pollution and electromagnetic pollution, so underground cable power supply is an inevitable trend in the development of modern cities. [0003] In recent years, there have been many accidents at home and abroad that caused the thermal collapse of the cable due to the load exceeding its actual current-carrying capacity, which proves the urgency and importance o...

AI Technical Summary

Problems solved by technology

[0004] However, in the actual field, the laying conditions of the cable group are complex and the environmental conditions are changeable. The existing methods of calculating the cable temperature using IEC standards in the prior art are mainly aimed at a single cable, and for multiple cables running at the same time. Accuracy needs to be improved

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