Breaker Damage Diagnosis Using Short-Circuit Current Phases
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Solution Overview
Problem
Existing technologies fail to diagnose damage to breakers caused by external short circuits, leading to potential continued use of damaged breakers which can result in safety issues and equipment failure.
Innovation Solution
A diagnostic device that assesses damage to breakers based on short-circuit current characteristics during the detection to interruption phase and the interruption to convergence phase, incorporating elements such as short-circuit current magnitude, number of occurrences, and time, to determine the extent of damage and safety for continued use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a breaker is used to interrupt short-circuit current, then the battery is protected from damage, but the breaker itself suffers damage from the short-circuit current
Solution Approach 1:
The diagnostic device performs preliminary diagnosis of breaker damage by analyzing short-circuit current characteristics before the breaker fails completely. This allows proactive detection of damage accumulation from external short circuits, enabling maintenance before catastrophic failure occurs.
Solution Approach 2:
The system establishes a feedback mechanism where the diagnostic device continuously monitors short-circuit current parameters (magnitude, duration, number of occurrences) and uses this information to assess breaker health status, providing ongoing feedback on breaker condition after each short-circuit event.
2Productivity
If breaker damage is not diagnosed, then the system operates continuously, but damaged breakers may fail leading to safety issues
Solution Approach 1:
The diagnostic device performs preliminary assessment of breaker damage by analyzing short-circuit current characteristics before the breaker fails completely. This allows proactive detection of damage accumulation, enabling maintenance scheduling that maintains continuous operation while preventing safety failures.
Solution Approach 2:
The system establishes a feedback mechanism where diagnostic results from short-circuit current analysis are used to determine breaker health status and operational safety, providing ongoing monitoring that enables continuous operation with confidence in system reliability.
3Reliability
If the breaker is replaced after every short circuit, then safety is ensured, but operational efficiency decreases due to frequent maintenance
Solution Approach 1:
The diagnostic device changes the approach from binary replacement decisions to nuanced assessment based on multiple parameters including short-circuit current magnitude, duration, and number of occurrences. This allows differentiated maintenance strategies where breakers are only replaced when diagnostic parameters indicate actual damage, improving operational efficiency while maintaining safety.
Solution Approach 2:
The system provides feedback on actual breaker condition based on short-circuit current analysis, enabling maintenance decisions based on real data rather than conservative replacement schedules. This feedback-driven approach optimizes the balance between safety and operational efficiency.
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
The diagnostic device accurately determines the extent of breaker damage, preventing the reuse of severely damaged breakers and reducing the risk of equipment failure by performing recovery operations and ensuring the breaker's contacts do not stick due to heat generation.
Implementation Method 1
when the external short circuit is detected, the current is interrupted by using a breaker such as a relay
Implementation Method 2
The short-circuit current due to the external short circuit damages the breaker
Data Source
AI summary
A diagnostic device and method diagnoses damage to a breaker that interrupts a current of an energy storage device. The damage to the breaker is diagnosed on the basis of a short-circuit current at a time of an external short circuit. The damage to the breaker can also be diagnosed on a basis of a short-circuit current during a first time from detection to interruption of a short circuit, and a short-circuit current during a second time from the interruption to convergence of the short-circuit current. An energy storage apparatus can include the diagnostic device.