Selective Outlet Isolation in Thyristor-Controlled Power Distribution
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Solution Overview
Problem
Existing low-voltage electrical distribution systems fail to isolate faulty outlets during electrical faults, leading to power supply loss in unaffected outlets.
Innovation Solution
An electrical distribution system with a controlled circuit breaker, cut-off devices, and an electronic control unit that manages the opening and closure of these components to isolate faulty outlets while maintaining power to unaffected circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a controlled cut-off device is used to protect against electrical faults, then safety is improved, but all outlets lose power supply when a fault occurs
Solution Approach 1:
The electrical distribution system is segmented into multiple independent zones, each controlled by its own cut-off device. When a fault is detected in one zone, only the cut-off device for that specific zone opens, while other zones remain powered. This segmentation allows selective isolation of faulty outlets without affecting the entire distribution system.
2Reliability
If multiple protection devices are installed in each outlet, then protection capability is improved, but device complexity increases
Solution Approach 1:
Each cut-off device is designed as a multi-functional unit that combines multiple protection capabilities (overcurrent protection, short-circuit protection, and selective isolation) into a single device. The electronic control unit coordinates these devices to provide comprehensive protection across the entire distribution system, eliminating the need for multiple separate protection devices at each outlet.
Solution Approach 2:
An electronic control unit is introduced as an intermediary that centralizes the control and coordination of all cut-off devices. This control unit receives signals from current sensors, determines fault locations, and selectively actuates appropriate cut-off devices, thereby simplifying the overall system architecture while maintaining high protection capabilities.
3Ease of operation
If autonomous protection devices are used, then operational simplicity is improved, but selective isolation capability is reduced
Solution Approach 1:
The system incorporates current sensors that continuously monitor electrical parameters and provide feedback to the electronic control unit. When a fault is detected, the control unit processes this information and selectively actuates the appropriate cut-off device. This feedback mechanism enables autonomous operation with sophisticated selective isolation capabilities, combining operational simplicity with adaptability.
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 system effectively isolates faulty outlets, minimizing power loss and ensuring continuous power supply to non-faulty circuits by rapidly controlling the circuit breaker and cut-off devices.
Implementation Method 1
The system comprises a controlled switch comprising two thyristors mounted in a head-to-tail fashion, the switch being coupled to the input and output terminals of the circuit breaker
Data Source
AI summary
An electrical distribution system having a connection input coupled to a power supply line, an electrical distribution line, a controlled circuit breaker having an input terminal coupled to the connection input and an output terminal coupled to the electrical distribution line, controlled cut-off devices coupled to the electrical distribution line, electrical distribution outlets configured to power electrical circuits, and an electronic control unit configured to control the opening and closure of the cut-off devices. The system includes a controlled switch including two thyristors mounted in a head-to-tail fashion. The switch is coupled to the input and output terminals of the circuit breaker. The electronic control unit is configured to control the opening and closure of the switch and of the circuit breaker.