Circuit Breaker Linkage Mechanism for Test Position Switching
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Solution Overview
Problem
Conventional circuit breakers lack a test position, necessitating regular disassembly for maintenance, which is inconvenient due to the need to disconnect and reconnect additional test circuits.
Innovation Solution
An adjustment mechanism for a circuit breaker that allows switching between a test position, connection position, and disconnection position through a pin-driven linkage system, enabling separate and controlled movement of terminals for testing and electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional circuit breaker with only connection and disconnection positions is used, then the structure is simple, but maintenance is inconvenient because the circuit breaker must be pulled out for regular maintenance and test circuit terminals must be disconnected and reconnected
Solution Approach 1:
The patent divides the circuit breaker into functionally independent segments: a test circuit system with test terminals and a main circuit system with connection terminals. The test circuit can be actuated independently through a test position, allowing maintenance personnel to access and test the test circuit without disconnecting or moving the entire circuit breaker. This segmentation enables the test circuit to be serviced separately from the main circuit.
Solution Approach 2:
The circuit breaker is designed with multi-functionality by incorporating both test and connection functions within a single device. The test position provides a test terminal that can serve testing purposes while the connection position provides connection terminals for main circuit operation. This allows the circuit breaker to perform multiple functions (testing and connection) without requiring separate devices or complex disassembly procedures.
2Adaptability or versatility
If additional test circuit components are added to enable testing, then testing capability is improved, but the device complexity increases and maintenance becomes more difficult
Solution Approach 1:
The test circuit is segmented as a separate functional unit with its own terminals and actuation mechanism. The test terminal is electrically connected to the actuator through the test circuit, forming an independent testing pathway that does not interfere with the main connection circuit. This segmentation allows the test capability to be added without complicating the main connection function.
3Ease of repair
If the circuit breaker is pulled out for maintenance, then access to internal components is improved, but operational time is lost and test circuit terminals must be disconnected
Solution Approach 1:
The test terminal is preliminarily positioned and configured within the circuit breaker housing, allowing testing to be performed without pulling out the entire device. The test circuit is pre-wired and accessible through the test position, enabling maintenance personnel to perform testing operations in place. This preliminary arrangement of the test circuit eliminates the need for time-consuming disconnection and reconnection of test terminals during maintenance.
Data Source
AI summary
An adjustment mechanism for a circuit breaker and the corresponding circuit breaker. The adjustment mechanism includes a pin adapted to move with respect to a base part of the circuit breaker along a predefined path; a first linkage coupled to the base part and adapted to drive a first terminal of the circuit breaker to move towards or away from the base part; and a second linkage coupled to a second terminal of the circuit breaker and adapted to be actuated by the pin to drive the second terminal to move towards or away from the base part. The groove has a first segment; and the second linkage is actuated by the pin and the first linkage is not actuated by the pin when the pin moves within the first segment in a first direction along the predefined path.