Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for measuring contact resistance on line

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: 2014-09-24
西安兴汇电力科技有限公司
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for measuring contact resistance on line
  • Method for measuring contact resistance on line
  • Method for measuring contact resistance on line

Examples

Experimental program
Comparison scheme
Effect test

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 ∞ ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com