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A Method of On-line Measuring Contact Resistance

A technology of contact resistance and contact elements, which is applied in the field of monitoring of power transmission and transformation equipment in power systems, and can solve problems such as narrow application range and difficulty in accurate measurement of resistance

Active Publication Date: 2016-06-01
西安兴汇电力科技有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for online measurement of contact resistance, which solves the problem that the existing technology is difficult to accurately measure the resistance of contact parts such as joints and switch blades, the scope of application is narrow, and it must be operated and measured offline in a laboratory environment. problem

Method used

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  • A Method of On-line Measuring Contact Resistance
  • A Method of On-line Measuring Contact Resistance
  • A Method of On-line Measuring Contact Resistance

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Experimental program
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Embodiment

[0025] Step 1. Taking the copper bus bar as an example, the parameters of the relevant materials are shown in Table 1, and assuming that the ambient temperature of the operating condition is 8°C, the heat source energy transmission proportional coefficient of the contact resistance of the heat source area is p=0.5, and the bus bar connection is as follows: figure 1 For the structure shown in , a large amount of temperature data is obtained by collecting temperature values ​​at a distance of 1 cm from the center of the heat source.

[0026] Table 1 Relevant parameters of copper busbar

[0027]

[0028] Step 2. Based on the results of step 1, use the software Origin to analyze the data and draw a curve fitting like Figure 4 Thermal time constant response curve for the center of the heat zone of the copper bus bar.

[0029] Step 3. Use the first-order heat path model:

[0030] θ xt = θ ∞ ...

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Abstract

The invention discloses a method for measuring contact resistance on line. The method comprises the following steps: firstly, measuring the real-time temperature of a surface point, close to a heat source area, of a contact element to be measured, so as to obtain temperature data, subsequently calculating heat response constant of the contact element according to a temperature response curve drawn according to the temperature data by using an established first-order heat path model equation and Origin software, and finally deriving according to the equation so as to obtain the contact resistance of the contact element. By adopting the method, the contact resistance of electric connectors, such as high voltage switch cabinet busbar connectors, switch connectors and knife switches can be accurately measured on line, and data reference is provided for practical application such as state monitoring, analysis and fault treatment on electric equipment.

Description

technical field [0001] The invention belongs to the technical field of power system power transmission and transformation equipment monitoring, and relates to a method for online measurement of contact resistance. Background technique [0002] In power equipment, electrical connectors such as switch connectors, busbar connectors, and terminal blocks are widely used. Due to the long-term operation of this type of electrical connector, it will cause mechanical wear of the contacts, pressure drop between the contact surfaces, or material oxidation and other adverse consequences, so that the original contact resistance will gradually increase with the increase of the service life, which requires this. Timely and accurate measurement of the contact resistance of electrical connectors to ensure the safe and stable operation of electrical equipment. [0003] At present, the measurement methods for contact resistance mainly include: 1) third harmonic method to measure contact resis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/02
Inventor 段建东张宏光叶兵张青山
Owner 西安兴汇电力科技有限公司
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