Temperature calculation method and device

Abstract

The invention provides a temperature calculation method and device, and relates to the technical field of electric power, and the method comprises the steps of carrying out the calculation based on the thermal expansion coefficient of a conductor, and obtaining the radius variation of the contact radius of the conductor; determining the actual contact radius of the conductor according to the initial contact radius and the radius variation of the conductor; and calculating the temperature of the contact area according to the actual contact radius and a temperature model preset for the contact area, the temperature model being used for indicating the temperature characteristic of the contact area; calculating the radius variation of the contact radius of the conductor based on the thermal expansion coefficient of the conductor; and using the radius variation for the temperature calculation of the contact area of the conductor, so that the influence of the thermal expansion factor of thecontact area is introduced into the temperature calculation result, the temperature of the contact area can be calculated more accurately under the condition that the temperature of the contact area is changed, and the accuracy of determining the temperature of the contact area is improved.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a temperature calculation method and device. Background technique [0002] In some power electronic devices, there are often contact areas for conductors. Due to the contact resistance, when the current flows through the contact area, additional heat will be generated, so under the same conditions, the temperature of the contact area will be higher than other parts of the conductor. [0003] In related technologies, the temperature distribution in the contact area can be calculated through the research and analysis of the transient temperature. For example, the temperature model of the contact area can be established by using the conductive bridge model and the heat balance equation, and the established temperature model can be calculated by using software tools according to the obtained parameters, so as to obtain the temperature distribution of the contact area of ​​th...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a temperature calculation method and device to solve the problem of inaccurate temperature in the contact area calculated when the temperature of the contact area changes.

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