Threaded Contact Device for Resistance Measurement
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Solution Overview
Problem
Existing resistance measurement techniques face challenges in reliably and simply making electrical contact with test objects that have threaded holes, particularly in high-voltage or medium-voltage networks, where precise separation of current and voltage path contacts is crucial but difficult due to small dimensions and internal threads.
Innovation Solution
A contacting device with a first and second contact, designed for mechanical coupling to the internal thread of a test object, where the contacts are electrically insulated and arranged to make contact at different positions, allowing for secure and easy installation, and can be configured as a clamp or connector with a screw section for threaded engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate measurement contacts are used to inject current and record voltage on a threaded connection point, then measurement precision is improved, but device complexity and difficulty of operation increase due to the small dimensions and internal thread structure
Solution Approach 1:
The patent combines multiple measurement contacts (current injection contacts and voltage measurement contacts) into a single integrated contacting device that can be attached to the threaded connection point. This merging eliminates the need for separate contacts, reducing device complexity while maintaining the four-point measurement capability and precision.
Solution Approach 2:
The contacting device is designed to perform multiple functions simultaneously: it provides both current injection paths and voltage measurement paths through its integrated structure. The device universally handles both current-carrying and voltage-sensing functions within a single component, simplifying the measurement setup while preserving measurement precision.
2Measurement precision
If separate measurement contacts are used for current and voltage paths, then measurement precision is improved, but ease of operation deteriorates due to difficulty in cleanly separating contacts on small connection points
Solution Approach 1:
The patent merges the separate current and voltage measurement contacts into a single integrated contacting device with a unified attachment mechanism for the threaded connection point. This eliminates the operational difficulty of separately positioning and attaching multiple contacts to small connection points, while maintaining clean separation of current and voltage paths internally within the device.
3Reliability
If a contacting device is mechanically coupled to an internal thread, then reliability of electrical contact is improved, but the complexity of the contacting device increases due to threaded engagement requirements
Solution Approach 1:
The patent integrates the threaded engagement mechanism directly into the contacting device structure, combining the mechanical coupling function with the electrical contact function in a single unified design. This approach improves reliability through secure threaded attachment while avoiding the complexity of adding separate coupling mechanisms to an otherwise simple contacting device.
Data Source
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AI summary
A contact-making device (10) is used for resistance measurement on a test object (30). The test object (30) comprises a threaded hole (31) which has an internal thread (32). The contact-making device (10) is designed to be mechanically coupled to the internal thread (32) of the threaded hole (31). The contact-making device (10) comprises a first contact (11) and a second contact (12) in order to make electrical contact with the test object (30) at at least two points when the contact-making device (10) is mechanically coupled to the internal thread (32). The first contact (11) and the second contact (12) are electrically insulated from one another by an insulating material (15-17) in the contact-making device (10).