Method and device for determining current-carrying capacity of cable

Abstract

The invention discloses a method and device for determining the current-carrying capacity of a cable. The method comprises the following steps of: measuring the skin temperature of the cable and the environmental temperature at a preset distance away from the cable; according to the skin temperature and the environmental temperature, determining the current-carrying capacity of the cable. According to the scheme of the invention, through measuring the skin temperature of the cable and the environmental temperature at a preset distance away from the cable, and based on the measured skin temperature and the environmental temperature, the current-carrying capacity of the cable is determined, and the current-carrying capacity of the cable is estimated through fully considering the surrounding environment temperature of the cable, therefore, the error influence of environment changes on the current-carrying capacity of the cable is avoided, so that the obtained current-carrying capacity of the cable is smaller in error and more accurate.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for determining the ampacity of a cable and a device for the ampacity of a cable. Background technique [0002] The 100% load factor ampacity of the cable (referred to as the cable ampacity) is one of the most important parameters in the cable line. The accurate calculation of the cable ampacity is important for both the design of the power cable and the operation of the power system. Significance, which is usually reflected in: the power design department selects the cable type and cable line design according to the cable ampacity, while the power operation department controls the load of the cable line according to the cable ampacity, so the calculation of the cable ampacity The determination method plays an important role in the operation of the entire power system. [0003] At present, the determination of ampacity is generally carried out using the methods ...

AI Technical Summary

Problems solved by technology

[0003] At present, the determination of ampacity is generally carried out using the methods in the IEC60287 standard or the IEC60853 standard. However, the methods in these two standards have the problem of excessive cable design margins, and the error is large, and it is impossible to obtain accurate data. cable ampacity

Taking the IEC60287 standard as an example, in the IEC60287 standard, the calculation of the ampacity is obtained by solving the thermophysical temperature field differential equation formed during the steady-state operation of the cable, and the environment is simplified to a single uniform heat transfer medium for calculation , but in fact, the heating of the cable during operation will cause changes in the surrounding environment, resulting in a large error in the calculation results obtained, which cannot accurately reflect the actual cable ampacity

Images