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

A technology of skin temperature and acquisition method, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of increasing the one-time investment of the device/system, relying on the health status of the temperature measuring device, and the workload of operation and maintenance. Achieve the effect of convenient calculation, advanced method and good time-varying characteristics

Active Publication Date: 2017-01-04
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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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

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

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Embodiment

[0033] 1. The principle of this method is:

[0034] The heating of a single-circuit cable mainly depends on the cable loss and the thermal characteristics of the section where it is located. The former has a clear correspondence with the operating current and operating temperature and can be directly applied; while the latter mainly depends on the geometric parameters of the section and the physical parameters of each part. , it can be considered that the physical parameters remain unchanged in the operating temperature range, which provides a theoretical basis for the establishment of the model.

[0035] and figure 1 The transient model shown depends on the skin temperature measurement is different, the temperature reference point of the model proposed in the present invention is the ambient temperature, the model is as follows figure 2 shown.

[0036] Among them, C 1 is the heat capacity of the cable itself, C 2 is the equivalent heat capacity of the section, R 1 Equil...

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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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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/08
Inventor 傅晨钊司文荣李红雷姚周飞
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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