Circuit Breaker Coordination for Downstream Failure Detection
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Solution Overview
Problem
Existing circuit breaker systems face safety issues due to single failures in downstream circuit breakers, leading to potential damage to surrounding components and reduced system uptime, as they require higher failure levels to trip upstream breakers, and existing solutions do not effectively detect and prevent internal device failures.
Innovation Solution
A circuit breaker system with a first control unit that monitors a second circuit breaker via communication means, changing its tripping characteristics to emergency mode upon detection of internal device failures, thereby preventing damage and maintaining system safety and uptime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upstream circuit breaker uses standard tripping characteristics, then normal operation is maintained, but system safety is reduced when downstream breaker fails
Solution Approach 1:
The trip unit dynamically changes its tripping characteristics based on the operational status of downstream circuit breakers. When a downstream breaker is detected as failed or offline, the upstream trip unit automatically switches from standard tripping characteristics to emergency tripping characteristics, enabling adaptive protection without requiring multiple physical trip units
Solution Approach 2:
The invention changes the tripping parameters (current thresholds, time delays) of the upstream circuit breaker based on the status of downstream breakers. By modifying these electrical parameters dynamically, the system achieves enhanced safety while using the same physical trip unit hardware
2Object-affected harmful factors
If the upstream circuit breaker requires higher failure levels to trip, then downstream component damage is prevented, but system uptime is reduced
Solution Approach 1:
The system performs preliminary detection of downstream breaker status and proactively adjusts tripping characteristics before a failure occurs. By detecting offline breakers in advance and switching to emergency mode beforehand, the system prevents component damage while maintaining optimal protection, avoiding unnecessary trips that would reduce uptime
Solution Approach 2:
The trip unit continuously monitors the status of downstream circuit breakers through communication means and uses this feedback to adjust its tripping behavior. This closed-loop control ensures the upstream breaker trips only when necessary for actual protection, preventing both component damage and unnecessary outages
3Measurement precision
If communication means are added between control units, then failure detection is improved, but device complexity increases
Solution Approach 1:
The communication means between control units serve multiple functions: detecting offline breakers, transmitting status information, and enabling coordinated tripping decisions. By making the communication system multi-functional, the invention achieves precise failure detection without proportionally increasing complexity
Solution Approach 2:
The communication means act as an intermediary that enables information exchange between upstream and downstream control units. This mediator allows the upstream trip unit to detect downstream failures accurately without requiring direct monitoring of each downstream component, simplifying the overall detection architecture
Data Source
Figure 1
AI summary
For a circuit breaker system (3) comprising a first circuit breaker (1) and a second circuit breaker (2), the first circuit breaker (1) having a first trip unit, a first control unit and a first electrical sensor, said first control unit controlling said first trip unit, the second circuit breaker (2) having a second trip unit, a second control unit and a second electrical sensor, said second control unit controlling said second trip unit, the circuit breaker system (3) further comprising means for the communication of the first control unit with the second control unit, it is suggested, that the first control unit monitors via said means for communication if there is an internal device failure in the second circuit breaker (2), wherein the first control unit is adapted to change its standard tripping characteristics to emergency tripping characteristics when the internal device failure of the second circuit breaker (2) is detected.