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Rapid cable temperature calculation method based on parameter fitting

A technology of parameter fitting and fast calculation, applied in calculation, complex mathematical operation, computer-aided design, etc. It can solve problems such as long solution time, and achieve the effect of simplifying fitting, reducing the amount of calculation, and facilitating calculation.

Active Publication Date: 2016-07-20
CHINA THREE GORGES UNIV
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Problems solved by technology

At this time, the numerical method of the temperature field is used to fit the thermal parameters of the cable, and there is a problem that the solution time is long

Method used

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  • Rapid cable temperature calculation method based on parameter fitting
  • Rapid cable temperature calculation method based on parameter fitting
  • Rapid cable temperature calculation method based on parameter fitting

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Embodiment Construction

[0026] A fast calculation method of cable temperature based on parameter fitting, including the following steps:

[0027] Step 1: Take the direct burial of the cable as an example, and establish the equivalent thermal circuit model of the traditional cable according to the thermal circuit parameters of each insulation layer of the cable and the soil. Ignoring the loss of the cable insulation layer, according to the dual-port theory, the cable equivalent thermal circuit model is simplified into a three-node thermal circuit model, and the heat generation, thermal resistance, heat capacity and other parameters in the model are equivalent by using converted values. For the three-node thermal circuit model, list the cable temperature differential equation.

[0028] Step 2: The cable starts to be in a zero initial state, that is, the cable temperature is equal to the ambient temperature and the applied current is zero. Apply a rated current to the cable, and record the temperature of th...

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Abstract

The invention provides a rapid cable temperature calculation method based on parameter fitting.The method includes the steps that firstly, according to cable laying characteristics, a heat circuit method is adopted, a transient cable temperature heat circuit model for parameter fitting is established, and a cable temperature differential equation is listed and written; aiming at a certain specific working condition of a cable, the cable gets into a zero initial state, rated currents are applied to the cable, and the cable core and surface temperatures of the cable generated when the cable temperature reaches a stable state are measured; according to the actually-measured cable core and surface temperatures of the cable, heat capacity and heat resistance heat parameters in the cable differential equation are fit through a trust region algorithm; finally according to the fit heat parameters, a cable temperature transient heat circuit is solved, the cable temperature is obtained, and a calculation equation is simplified.According to the rapid cable temperature calculation method based on parameter fitting, transient heat parameters of a conversion model can be rapidly acquired in combination with the actually-measured temperatures under the rated transmission capacity of the cable, the simplified calculation equation of the cable core and surface temperatures of the cable is obtained, and the purpose of rapidly calculating the cable temperature is achieved.

Description

Technical field [0001] The invention provides a method for quickly calculating cable temperature based on parameter fitting, and relates to the field of cable temperature calculation. Background technique [0002] Calculating the temperature of the cable to determine whether the transmission capacity is reasonable is of great significance to the economic and safe operation of the cable. At present, the main methods of direct buried cable temperature calculation are: numerical calculation methods mainly based on finite element method, finite volume method, and boundary element method, and thermal circuit method based on IEC60287 and IEC60853 standards. However, the above methods all use the thermal parameters of the cable insulation material and the laying soil as known values ​​when calculating the cable temperature. However, when calculating the temperature of a directly buried cable, the thermal parameters of the cable insulation layer and the soil are not easy to obtain, and ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06F17/13G06F17/12
CPCG06F17/12G06F17/13G06F30/367G06F2119/08
Inventor 张宇娇徐彬昭
Owner CHINA THREE GORGES UNIV
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