Multi-Pole Circuit Breaker Contact Resistance Testing
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Solution Overview
Problem
Testing multi-pole electrical circuit breakers earthed on both sides is impractical due to measurement interference, making it difficult to accurately determine contact resistance and identify faults.
Innovation Solution
A method and device that earth only one pole initially and then connect the other poles in parallel, allowing for micro-ohm measurements while maintaining safety, using multiple micro-ohm meters to calculate contact resistances by solving a system of equations based on voltage and current measurements across different poles and earth connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all poles are earthed on both sides for safety, then safety is improved, but measurement precision deteriorates due to earth connection interference
Solution Approach 1:
The earth connection system is segmented into multiple independent earth connections (first earth connection and second earth connection) for different poles. By measuring each pole's earth connection resistance separately and calculating the difference, the system isolates the contact resistance measurement from the interference of other earth connections, enabling accurate measurements while maintaining all poles earthed for safety.
2Ease of operation
If multiple poles are connected in parallel for earth connection, then ease of operation is improved, but device complexity increases due to multiple measurement configurations
Solution Approach 1:
The measurement device is designed with universal functionality to measure multiple poles using the same basic measurement circuit and methodology. The device can sequentially measure different poles and their earth connections using identical hardware components, eliminating the need for different measurement equipment for each pole and simplifying the overall device configuration.
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
Enables safe, accurate, and reliable testing of multi-pole circuit breakers by isolating contact resistance measurements from earth connection effects, allowing for comprehensive evaluation of contact resistances and fault identification.
Implementation Method 1
the resistance occurring at the circuit breaker is measured by means of infeed of a predefined current and a voltage is measured by means of the switch
Data Source
AI summary
The present method relates to a method for checking a multi-pole electrical circuit breaker. The multi-pole electrical circuit breaker comprises a plurality of poles (101-103). Each of the plurality of poles (101-103) comprises a first connection (121-123) and a second connection (131-133). Closing the particular pole (101-103) makes it possible to electrically connect the first connection (121-123) of the particular pole (101-103) to the second connection (131-133) of the particular pole (101-103) via the pole. In the method, a plurality of micro-ohm measurements are carried out at the plurality of poles (101-103), while the plurality of poles (101-103) are earthed on both sides in a P-P-P-E configuration. A contact resistance of one of the plurality of poles (101-103) is determined on the basis of the plurality of micro-ohm measurements.