Method for acquiring transient state temperature rise of single circuit cable core without depending on skin temperature

Abstract

The invention relates to a method for acquiring the transient state temperature rise of a single circuit cable core without depending on the skin temperature. The method comprises the following steps: 1) acquiring the heat flow carrying capacity, the boundary temperature, the cable density, the specific heat harmonic heat conductivity coefficient of a cable, as well as the soil density, the soil specific heat and the soil heat transfer coefficient of soil related to the single circuit cable, to obtain a relation of the dissipated heat flow of the single circuit cable and the transient state temperature rise of the core; 2) respectively acquiring the parameters of a transient state temperature rise model, independent of the skin temperature, of the single circuit cable according to the relation of the dissipated heat flow and the transient state temperature rise of the core; 3) constructing the transient state temperature rise model, independent of the skin temperature, of the single circuit cable; 4) acquiring the environment temperature of the single circuit cable, and calculating the transient state temperature rise of the single circuit cable core. Compared with the prior art, the method has the advantages of convenience in computation, simple principle, advanced method and the like.

Description

technical field [0001] The invention relates to the technical field of power cable operation, in particular to a method for obtaining transient temperature rise of a single-circuit cable core independent of skin temperature. Background technique [0002] Due to the particularity of power cable operation, it is generally impossible to obtain the core temperature of the power cable through direct measurement, especially the real-time transient temperature of the core. Therefore, technicians have proposed a variety of methods to calculate the core temperature of the power cable. Engineering formulas or approximate formulas based on numerical solutions and test results. For example, based on the IEC60287 standard, it is a classic calculation method for calculating the core temperature of power cables, and a solution method for ampacity based on numerical calculation. For the cable in actual operation, the numerical method is used to solve the problem. Considering the complexity...

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Problems solved by technology

[0004] However, this type of method has several defects: it depends heavily on the health status of the temperature measurement device, and defects such as temperature measurement deviation and transmission communication will directly restrict the selection of cable equipment operation

Considering that there are several sections of a cable that need to be monitored, it is necessary to install multiple sets of temperature measuring devices, so the reliability of the overall system is extremely low, which is also the fundamental reason why this type of method cannot be directly applied on a large scale; / The overall reliability of the system needs to enhance the redundant design, or even the method of combining multiple sets, which not only increases the initial investment of the device / system, but also brings a huge workload to the subsequent operation and maintenance

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