Switchgear Contact Measurement for Force-Resistance Mapping
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Solution Overview
Problem
Existing methods for inspecting female contacts in LV switchgears fail to effectively measure parameters such as electrical resistance and contact force, leading to issues like electrical loss, heat generation, and poor contact performance during short circuits due to wear and mechanical factors.
Innovation Solution
A contact measurement system that combines spatial and dynamic measurements of electrical resistance, axial force, and position to determine a position-dependent force characteristic, allowing for integrated assessment of contact quality and condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate measurements of electrical resistance and contact force are performed, then measurement capability is provided, but measurement integration and comprehensive assessment are insufficient
Solution Approach 1:
The patent combines separate measurement devices for electrical resistance, axial force, and position into a single integrated contact measurement system. The control unit receives data from all three measurement devices and processes them together to determine position-dependent force characteristics and contact status, enabling comprehensive contact condition assessment through unified measurement and evaluation.
2Reliability
If peak sliding force measurement is used, then contact condition monitoring is enabled, but detailed position-dependent force characteristics are lost
Solution Approach 1:
The patent transitions from static peak sliding force measurement to dynamic force measurement that captures the entire force-position relationship during contact insertion and withdrawal. The system continuously measures axial force as a function of position, generating force characteristics that show how force varies throughout the contact process, providing detailed information about contact behavior at different positions.
Solution Approach 2:
The patent adds the position dimension to the force measurement, transforming a single peak force value into a position-dependent force characteristic curve. By measuring force across multiple positions during insertion and withdrawal, the system creates a two-dimensional representation (force vs. position) that reveals detailed contact mechanics including friction zones, contact pressure distribution, and lamella deformation behavior.
3Measurement precision
If only electrical resistance measurement is performed, then electrical contact quality is assessed, but mechanical contact performance during short circuits cannot be evaluated
Solution Approach 1:
The patent creates a multi-functional measurement system that simultaneously assesses both electrical and mechanical contact performance. The integrated system measures electrical resistance, axial force, and position, then combines these measurements to evaluate comprehensive contact status including electrical conductivity, mechanical strength during short circuits, and overall contact quality, making the system versatile for multiple assessment types.
Data Source
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AI summary
The present invention relates to a contact measurement system for measuring a parameter of a contact of a switchgear, comprising a first device configured to measure an electrical resistance of the contact and to map the electrical resistance spatially and/or dynamically; a second device configured to measure an axial force of the contact and to map the axial force spatially and/or dynamically; and a third device configured to measure a position of the contact; wherein the contact measurement system is configured to determine a position-depending force characteristic based on the measured axial force of the contact and the position of the contact; wherein the contact measurement system is configured to determine a status of the contact based on a combination of the position-depending force characteristic with the electrical resistance of the contact.