Method for measuring power connector contact temperature rise based on finite element analysis of three-dimensional thermal field

Abstract

The invention provides a method for measuring power connector contact temperature rise based on finite element analysis of a three-dimensional thermal field. The method is used for displaying the measuring result and the room temperature in real time, is convenient for computing the contact temperature rise and is used for judging whether the connector is qualified or not with the testing standard. The method comprises the following steps: establishing a three-dimensional thermal field model of the power connector by utilizing finite element simulation analysis software (ANSYS), establishing a contact resistance equivalent phantom model through computation of the contact resistance and the contact area; carrying out data processing on the temperature of all the nodes on the end face of the connector contact and the temperature of all the nodes at the end of the contact wiring, wherein the temperature is obtained by simulation; verifying the correctness of the model by comparing the above temperature with the instantaneous value, which is measured in test, of the temperature at the end of the connector contact wiring; and an upper computer selecting one phase for measuring. The method can be used for displaying the measuring result and the room temperature in real time, is convenient for computing the contact temperature rise and can be used for judging whether the connector is qualified or not.

Description

(1) Technical field [0001] The invention relates to measurement technology, in particular to a method for measuring temperature rise of electric connector contacts based on three-dimensional thermal field finite element analysis. (2) Background technology [0002] Power connectors are electrical connection devices specially used in railway vehicles, urban rail vehicles and industrial electrical systems. The railway passenger car power connector is a key electrical appliance for train power supply, and its performance directly affects the service quality and operation safety of the train. According to the railway industry standard TB / T 2408-93, the contact resistance of the power connector should be within the range of 0-0.8mΩ. However, when the power connector fails, as the contact resistance increases, the Joule heat generated by the contact resistance is enough to make the temperature of the contact surface rise sharply, and even exceed the temperature resistance range of...

AI Technical Summary

Problems solved by technology

However, since there is only a qualitative relationship between the contact resistance value and the temperature rise of the contact, and it is difficult to reflect the growth trend of the contact temperature rise in real time through the test of the contact resistance value, this method has certain limitations. , and it is impossible to obtain accurate data on the temperature rise of the contacts and effectively judge the reliability of the connector work

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