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Method for calculating real-time conductor temperature of three-core cable

A three-core cable, conductor temperature technology, applied in thermometers, thermometers using electrical/magnetic components directly sensitive to heat, and electrical devices, etc., can solve the problem of inapplicability of refined management of power distribution equipment

Inactive Publication Date: 2014-12-10
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

This is obviously not applicable to today's demand for fine-grained management of power distribution equipment

Method used

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  • Method for calculating real-time conductor temperature of three-core cable
  • Method for calculating real-time conductor temperature of three-core cable
  • Method for calculating real-time conductor temperature of three-core cable

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Embodiment

[0049] According to a method for calculating the real-time conductor temperature of a three-core cable based on the simplest thermal path proposed by the present invention, combined with the calculation of the basic parameters of the three-core cable, a real-time conductor temperature calculation program for the three-core cable is compiled to facilitate the calculation of the real-time conductor temperature calculation value . Taking the XLPE three-core power cable (model YJV22-8.7 / 15-3×240) as an example, a step current is applied under the condition of air laying single circuit, and single circuit is applied under the condition of direct burial, pipe arrangement and cable trench laying. The loop and multi-loop apply a periodic load current, and use thermocouples to measure the cable sheath temperature and conductor temperature during the current application process. A method for calculating real-time conductor temperature of a three-core cable based on the simplest thermal ...

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Abstract

The invention discloses a method for calculating the real-time conductor temperature of a three-core cable. The method comprises the following steps of: (1) simplifying a complete transient-state thermal circuit model of the three-core cable into the simplest transient-state thermal circuit model only containing an equivalent thermal capacitance and an equivalent thermal resistance; (2) only considering current changes and skin temperature changes to obtain the relationship among the temperature of a conductor, a load current and a skin temperature, thus obtaining the temperature rise of the conductor caused by only considering current changes and skin temperature changes due to analogy on a first-order circuit transient response; (3) calculating the generated steady-state temperature rise and a temperature rise caused by medium losses according to a current at an initial time; (4) calculating a temperature rise caused by n times of currents and skin temperature changes in two hours (a cable thermal time constant) from the initial time; (5) summating the skin temperature at the initial time and all the temperature rises above to obtain the conductor temperature of the three-core cable currently.

Description

technical field [0001] The invention relates to a method for calculating the real-time conductor temperature of a three-core cable by using the load current and the sheath temperature, and in particular to a method for directly obtaining the three-core conductor temperature through an analytical algorithm under the simplest thermal circuit model simplified to an equivalent heat capacity and thermal resistance. Calculation method of real-time conductor temperature of core cable. Background technique [0002] The conductor temperature of the cable (the temperature of the insulating material) directly determines its operating state, and it is not conducive to giving full play to the cable's ability if it exceeds or falls below the allowable working temperature of the insulating material for a long time. Therefore, it is of great significance to monitor the temperature of the cable conductor. Since the cable conductor is loaded with high power frequency voltage (such as 10kV), ...

Claims

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Application Information

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IPC IPC(8): G01K7/16
Inventor 牛海清庄小亮叶开发
Owner SOUTH CHINA UNIV OF TECH
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