Shared High Frequency Detector for Arc Fault Detection
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Solution Overview
Problem
Existing arc fault detection systems are inefficient in detecting sporadic arc faults due to the overload capability of conventional circuit breakers being ineffective, and the cost of individual and entire load panels with arc fault circuit interrupters (AFCIs) is a concern.
Innovation Solution
An arc fault detection system that shares a high frequency detector module among multiple AFCIs, utilizing both high and low frequency spectral content to detect arc faults, where the high frequency content is detected centrally and communicated to individual AFCIs, allowing each to trip open and interrupt power flow without the need for individual high frequency detection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic arc fault sensing is added to each circuit breaker, then arc fault detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple AFCI units into a single integrated system where the high frequency detector module is shared among all AFCIs. This merging approach maintains arc fault detection capability while reducing redundancy and overall system complexity.
Solution Approach 2:
The shared high frequency detector module serves multiple AFCI units simultaneously, making it a universal component that performs the same function for multiple circuit breakers. This multi-functionality reduces the need for duplicate components in each AFCI.
2Measurement precision
If individual high frequency detector modules are included in each AFCI, then detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the high frequency detection function into a single shared module that serves multiple AFCIs. This consolidation reduces the total number of high frequency detector modules needed, thereby lowering manufacturing costs while maintaining detection accuracy through centralized monitoring.
Solution Approach 2:
Instead of each AFCI having its own high frequency detector, the system creates a centralized copy that serves all units. The detected high frequency signals are then distributed to individual AFCIs via the communication bus, achieving the same functional result with fewer components.
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
This approach reduces the component cost and complexity of each AFCI, enabling effective arc fault detection and interruption while maintaining system reliability and safety.
Implementation Method 1
a high frequency detector module structured to receive power from a power source and to detect first spectral content of the power having a frequency in a first frequency range
Implementation Method 2
a low frequency detector module structured to detect second spectral content of the power having a frequency in a second frequency range
Implementation Method 3
an arc fault detection unit structured to detect an arc fault based on the detected first and second spectral content of the power
Data Source
AI summary
An arc fault detection system includes a high frequency detector module structured to detect first spectral content of power having a frequency in a first frequency range, a number of arc fault circuit interrupters each having separable contacts, a low frequency detector module structured to detect second spectral content of power having a frequency in a second frequency range, a control unit structured to control the separable contacts to trip open, and an arc fault detection unit structured to detect an arc fault based on the detected first and second spectral content of the power and to cause the control unit to control the separable contacts to trip open in response to detecting the arc fault. A communication bus provides communication between the high frequency detector and the arc fault circuit interrupters and the first frequency range includes frequencies that are higher than frequencies in the second frequency range.