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Finite element thermal analysis equivalent method for contact resistance of ground wire and pre-twisted wire contact port

A technology of contact resistance and pre-twisted wire, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as disconnection of overhead ground wires, affecting the safe and stable operation of the power grid, and power outages in the power grid, so as to reduce the required the effect of time

Inactive Publication Date: 2018-08-17
SOUTH CHINA UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0002] Accidents of disconnection of overhead ground wires due to overheating occur from time to time, resulting in power outages in large areas of the power grid, seriously affecting the safe and stable operation of the power grid

Method used

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  • Finite element thermal analysis equivalent method for contact resistance of ground wire and pre-twisted wire contact port
  • Finite element thermal analysis equivalent method for contact resistance of ground wire and pre-twisted wire contact port
  • Finite element thermal analysis equivalent method for contact resistance of ground wire and pre-twisted wire contact port

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Embodiment 1

[0034] A kind of contact resistance finite element thermal analysis equivalent method of ground wire and pre-twisted wire contact port, the step flow chart is as follows figure 1 As shown, it mainly includes the following steps:

[0035] Step 1, obtain the resistance value of the contact resistance of the contact port of the overhead ground wire and the pre-twisted wire through experiments;

[0036] Step 2, at the contact port between the ground wire and the pre-twisted wire, the thermal effect generated by the contact resistance is caused by the diffusion of current here, and the contact area corresponding to the contact resistance is obtained by using finite element electromagnetic simulation or analytical calculation;

[0037] Step 3, calculate the heat flux according to the contact resistance obtained by the experiment and the contact area obtained by calculation;

[0038] Step 4, use the finite element simulation software ANSYS or comsol to establish a three-dimensional ...

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Abstract

The invention discloses a finite element thermal analysis equivalent method for contact resistance of a ground wire and pre-twisted wire contact port. The method comprises the steps of firstly obtaining a resistance value of the contact resistance of the overhead ground wire and pre-twisted wire contact port through an experiment; performing calculation to obtain a contact area corresponding to the contact resistance; according to the contact resistance and the contact area, calculating out thermal flow density; building three-dimensional models of a ground wire and a pre-twisted wire, and loading the calculated thermal flow density at the contact area of the contact port; and finally, designing a large-current temperature rise experiment, and verifying a finite element simulation result.The method avoids modeling requirements on a complex contact interface in finite element simulation, and has significance of general popularization and use.

Description

technical field [0001] The invention relates to the technical field of power grid and overheating analysis research, in particular to a contact resistance finite element thermal analysis equivalent method of a ground wire and a pre-twisted wire contact port. Background technique [0002] Accidents of disconnection of overhead ground wires due to overheating occur from time to time, resulting in power outages in large areas of the power grid, seriously affecting the safe and stable operation of the power grid. The existing research shows that when the power frequency short-circuit current flows through the ground wire, at the contact port between the ground wire and the pre-twisted wire, the current diffuses to the pre-twisted wire due to the skin effect, and the contact resistance of the ground wire and the pre-twisted wire contact port is An important factor leading to overheating and disconnection of the ground wire. Therefore, it is an indispensable link to consider the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 刘刚郭德明陈星宇
Owner SOUTH CHINA UNIV OF TECH
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