Circuit Breaker Anti-Rebound Locking for Contact Rebound Control
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Solution Overview
Problem
Existing circuit breakers face issues with moving contact rebound during opening operations due to high gas pressure, leading to potential secondary electric breakdowns, which can compromise their performance.
Innovation Solution
An anti-rebound protection device with a control cam, control lever, and locking mechanism limits the rebound of the moving contact using mechanical means, comprising a locking member and stoppers to control the rotation of the output lever.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the release flow of high-pressure gas is increased to prevent rebound, then the anti-rebound performance is improved, but other performances of the circuit breaker are sacrificed
Solution Approach 1:
A control lever is introduced as an intermediary mechanical component that mediates between the gas pressure force and the output lever. The control lever with its stoppers provides a mechanical constraint that prevents the output lever from rotating beyond a predetermined angle, thereby preventing contact rebound without requiring excessive gas release flow that would compromise other circuit breaker performances.
2Reliability
If a locking mechanism is added to prevent output lever rotation in the second direction, then the anti-rebound performance is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is merged with the control lever assembly. The control lever itself serves dual purposes: it acts as a control element during normal operation and as a locking mechanism during opening operation. The stoppers on the control lever combine with the housing structure to form the locking function, eliminating the need for separate locking components and reducing overall device complexity.
Solution Approach 2:
The control lever performs multiple functions: it controls the opening operation by interacting with the control cam, it provides mechanical constraint through its stoppers, and it forms part of the locking mechanism that prevents excessive rotation. This multi-functionality reduces the number of separate components needed, thereby limiting device complexity while maintaining effective anti-rebound performance.
Data Source
AI summary
An anti-rebound protection device and a circuit breaker comprising the same is disclosed. The anti-rebound protection device for the circuit breaker includes an operating mechanism. The operating mechanism of the circuit breaker includes a housing, a main shaft arranged in the housing, and an output lever connected to the main shaft. The anti-rebound protection device includes a control cam; a control lever being rotatable relative to the housing, and provided with a first stopper for abutting against the control cam; and a locking mechanism comprising a locking member rotatably connected to the output lever and a second stopper provided on the control lever.