Outlet-Level Short-Circuit Protection via Data Link Control
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Solution Overview
Problem
Existing electrical installations do not provide optimal protection against short circuits, and the selection of magnetic detection means for such systems can be challenging.
Innovation Solution
A protection system that includes multiple short-circuit detection devices, each associated with one or more electrical outlets, connected to an electrical circuit breaker via a data link to send trip signals and control signals, with each outlet having a switching device that can be controlled to open or close based on current flow, and a data link capable of transmitting both trip and control signals to ensure effective isolation during short-circuit detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single main differential circuit breaker with magnetic detection means is used for short-circuit protection, then the system structure is simple, but the protection against short-circuits is not optimal and the choice of caliber is tricky
Solution Approach 1:
The patent divides the electrical installation into multiple independent zones, each protected by its own detection device and switching mechanism. Instead of using a single main differential circuit breaker for all outlets, the system segments protection into individual outlet-level units with local short-circuit detection devices that can independently detect and respond to faults in their respective zones.
Solution Approach 2:
The patent introduces a data link as an intermediary communication channel between the detection devices and the circuit breaker. This data link transmits trip signals from detection devices to the circuit breaker and control signals from the circuit breaker to switching devices, enabling coordinated protection without requiring complex direct wiring between all components.
2Reliability
If multiple short-circuit detection devices are installed at each outlet, then the protection coverage is improved, but the device complexity and number of components increase
Solution Approach 1:
The circuit breaker is designed with multi-functionality, serving both as the main protective device and as a control center that receives trip signals from multiple detection devices via the data link. The circuit breaker integrates both protection and control functions, reducing the need for separate dedicated components for each function.
Solution Approach 2:
The system implements feedback through the data link, which continuously monitors the status of detection devices and transmits trip signals to the circuit breaker when short-circuits are detected. The circuit breaker also sends control signals back through the same data link to switching devices, creating a closed-loop feedback system that improves reliability without proportionally increasing component count.
3Device complexity
If the data link transmits both trip signals and control signals, then the wiring complexity is reduced, but the signal transmission reliability may be affected
Solution Approach 1:
The system uses periodic signal transmission over the data link, with distinct time slots or periodic patterns for different signal types. Trip signals and control signals are transmitted at different times or with different temporal characteristics, allowing the single data link to reliably carry multiple signal types without interference by using time-division or periodic transmission schemes.
Data Source
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AI summary
The system (20) has a set of detection elements (28) connected to an electric circuit breaker (26) by a data link (30) to send a triggering signal to the breaker during detection of a short-circuit. An electric switching apparatus (32) is provided for electric feeders (14) and controlled in a position selected among opening and closing positions corresponding to absence of circulation of electrical current in the feeders and flow of the current in the feeder. The data link simultaneously transmits the triggering signal for the circuit breaker and a control signal for switching apparatus. An independent claim is also included for an electric facility.