Copper-Beryllium Test Probe for Transformer Winding Resistance
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Solution Overview
Problem
Transformer winding resistance testers face challenges in obtaining accurate and consistent results due to the introduction of unknown resistance errors from conductive rods used in loadbreak bushings, as different materials like copper, steel, or aluminum introduce varying resistivity factors.
Innovation Solution
A test probe with two conductive halves secured by an electrically insulating material, designed to match the diameter of loadbreak bushing connectors, featuring a 'T' shape with 'L' shaped portions for current and voltage sense lead attachments, made from copper-beryllium to minimize probe resistance and error, and a method involving a rod-shaped probe portion that is inserted into the bushing, with a current source and voltage sense lead coupled to a resistance tester.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conductive rod is inserted into the loadbreak bushing to measure winding resistance, then the measurement can be obtained, but the resistance of the test probe introduces unknown error due to different resistivity of materials
Solution Approach 1:
The patent changes the material parameter of the conductive rod from conventional materials (copper, steel, aluminum) to copper-beryllium alloy, which has superior electrical conductivity and mechanical properties. This parameter change reduces the resistivity of the probe, thereby minimizing the error introduced by the test probe and improving measurement accuracy and consistency.
Solution Approach 2:
The patent uses copper-beryllium composite material for the conductive rod, combining the high electrical conductivity of copper with the strength and stiffness of beryllium. This composite material provides both low resistivity for accurate measurements and mechanical strength for reliable operation, resolving the contradiction between measurement precision and reliability.
2Measurement precision
If the test probe resistance is minimized by changing material, then measurement accuracy improves, but the complexity of the probe structure increases
Solution Approach 1:
The test probe is segmented into two separate conductive halves that can be inserted into the loadbreak bushing from opposite directions. This segmentation allows each half to be simpler in structure while collectively achieving the function of minimizing probe resistance through the copper-beryllium material, without requiring a complex monolithic structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively minimizes the error introduced by the test probe, providing more accurate and consistent transformer winding resistance measurements by using copper-beryllium conductive halves and an insulating material to isolate them, ensuring precise resistance readings.
Implementation Method 1
an electrically insulating material disposed between the halves electrically insulating them from each other
Implementation Method 2
The test probe includes two conductive halves secured together... Each of these materials has different resistivity and will therefore introduce an unknown amount of error to the winding resistance measurement
Data Source
AI summary
A test probe has a probe portion, a current source lead attachment portion and a voltage sense lead attachment portion. The test probe includes two conductive halves secured together with an electrically insulating material disposed between the halves electrically insulating them from each other. Each half has an “L” shape including a probe portion and a test lead attachment portion extending perpendicularly outwardly from the probe portion, and provides the test probe with an overall “T” shape. The conductive halves can be made of copper-beryllium. Methods of providing and using the test probe can include uncoupling a male coupling member of a power cable connector of a loadbreak bushing assembly from a female coupling member of the loadbreak bushing and inserting the rod-shaped probe portion into the female coupling member.