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Ground wire and pre-twisted wire contact port contact resistance bridge experimental measurement method

A measurement method and contact resistance technology, applied in the direction of measuring resistance/reactance/impedance, measuring device, measuring electrical variables, etc., can solve problems such as measurement result error, achieve the effect of less measurement data and avoid magnetic interference

Active Publication Date: 2018-08-10
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the contact resistance of the contact port between the ground wire and the pre-twisted wire, if the direct current bridge is used for measurement, the influence of the skin effect will be ignored, which will cause a large error in the measurement result

Method used

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  • Ground wire and pre-twisted wire contact port contact resistance bridge experimental measurement method
  • Ground wire and pre-twisted wire contact port contact resistance bridge experimental measurement method
  • Ground wire and pre-twisted wire contact port contact resistance bridge experimental measurement method

Examples

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Embodiment 1

[0026] An experimental measurement method for the contact resistance of the ground wire and the pre-twisted wire contact port based on a DC bridge, the flow chart is as follows figure 1 As shown, it mainly includes the following steps:

[0027] S1, first, sand the both sides of the ground wire and the pre-twisted wire contact port with sandpaper to remove the oxide film on the surface;

[0028] S2, use braided annealed copper wire to wrap the ground wire and pre-twisted wire on both sides of the contact port for a circle to avoid too much concentration when measuring current injection; connect the terminal at the same end of the current and voltage of the DC bridge to the braided annealed copper wire of the measured line section connected;

[0029] S3, before using the DC bridge for measurement, perform zero calibration on the bridge and adjust the potential balance of the circuit;

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Abstract

The invention discloses a ground wire and pre-twisted wire contact port contact resistance bridge experimental measurement method. Firstly the surface oxide film of the ground wire and pre-twisted wire contact port is removed; the braided soft copper wire is applied to wind a circle of the ground wire and the pre-twisted wire of the two sides of the contact port; zero calibration and loop potential balance adjustment are performed on the bridge before performing measurement through the DC bridge; and two times of measurement of positive and negative current is performed on the measured object,there are at least three measurement sets, and finally multiple sets of data are averaged so as to obtain the measured contact resistance of the ground wire and pre-twisted wire contact port. The DCbridge measurement method is adopted, and the contact resistance of the contact port can be accurately measured through specific setting without considering the skin effect so as to have the meaning of wide popularization and application.

Description

technical field [0001] The invention relates to the technical field of experimental measurement of contact resistance, in particular to a bridge experimental measurement method for the contact resistance of a ground wire and a pre-twisted wire contact port. Background technique [0002] When factors such as lightning strikes cause the tower to flashover, the power frequency short-circuit current flows from the tower to the ground wire, and the skin effect causes the current to spread at the contact port between the ground wire and the pre-twisted wire in the suspension string of the ground wire, and the contact resistance of the contact port is generated. The thermal effect will eventually cause the temperature to be too high or even cause a disconnection accident. That is to say, the combined effect of power frequency short-circuit current and contact resistance is the main reason for severe heating or even disconnection of the contact port. Therefore, it is necessary to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/08
Inventor 刘刚郭德明
Owner SOUTH CHINA UNIV OF TECH
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