Multi-Pole Circuit Breaker Pole Synchronization
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Solution Overview
Problem
Multi-pole circuit interrupters often experience trip failures due to wear and tear or environmental stress, leading to hazardous conditions where one pole remains energized while the other is not, posing risks to equipment and users.
Innovation Solution
A multi-pole circuit interrupter with electronic solid-state monitoring that detects line voltage variations and controls a solenoid to trip the energized pole, ensuring both poles are either on or off simultaneously, using a tie bar and trip bar mechanism to synchronize operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical trip bar and tie bar mechanisms are used to couple poles, then both poles can be synchronized to turn ON and OFF together, but the mechanical components fail due to wear and tear and environmental stress, leading to trip failures
Solution Approach 1:
The patent replaces the mechanical trip bar coupling system with an electronic monitoring system that uses voltage detection circuits to sense the energized state of each pole and a control circuit to trigger solenoids for tripping the energized pole, eliminating wear and tear associated with mechanical components
Solution Approach 2:
The electronic monitoring system automatically detects when one pole is energized and the other is not, and automatically triggers the tripping mechanism without requiring mechanical wear-based indicators or manual intervention
2Reliability
If electronic solid-state monitoring is implemented to detect line voltage variations, then trip failures can be detected and the energized pole can be tripped, but the device complexity increases
Solution Approach 1:
The voltage detection circuit serves multiple functions: it detects line voltage presence, determines which pole is energized, and provides signals for tripping control, allowing a single circuit to perform what would otherwise require multiple separate systems
Solution Approach 2:
The patent combines the monitoring function and the tripping control function into a single integrated electronic system that shares common circuitry and power sources, reducing overall complexity compared to having separate independent systems
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
Prevents unsafe situations by ensuring synchronized tripping of both poles, enhancing safety and preventing equipment damage from improper energization states.
Implementation Method 1
controls a solenoid to trip the energized pole
Data Source
AI summary
A multi-pole circuit interrupter configured to be coupled between an AC source and an electric load electronically detects a hazardous condition associated with energizing of poles and responds to overcome the hazardous condition using a solenoid. The multi-pole circuit interrupter comprises a first switch to energize a first pole on a phase A conductor of the multi-pole circuit interrupter and a second switch to energize a second pole on a phase B conductor of the multi-pole circuit interrupter. The multi-pole circuit interrupter further comprises an electronic solid-state circuit coupled to the phase A conductor and the phase B conductor to detect a line voltage variation and control a current to a device in response to trip an energized pole among the first pole and the second pole if only one of the first pole and the second pole is energized when a user controls a tie bar to turn ON or turn OFF the multi-pole circuit interrupter or when a trip bar fails to trip one of the first pole and the second pole.