Electrical Protection Switching for Fast Fault Isolation
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Solution Overview
Problem
Conventional circuit breakers with electronic breaking devices based on semiconductor components are expensive and have high production costs, despite offering rapid breaking capabilities.
Innovation Solution
A protection device utilizing a control unit to manage semiconductor-based power switches for rapid cut-off and high cut-off capacity, with features like input and output current measurement, differential current detection, and voltage monitoring, allowing for efficient operation and reduced production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional circuit breakers with arc chutes are used, then production costs are lower, but breaking capacity and breaking speed are reduced
Solution Approach 1:
The patent introduces a magnetic field as an intermediary substance to assist the arc chute in extinguishing the arc. The magnetic field, generated by a magnetic generator (permanent magnet or electromagnet), interacts with the arc plasma to increase arc length and improve extinction efficiency, enabling conventional breakers to achieve higher breaking capacity without semiconductor components
Solution Approach 2:
The patent changes the physical parameters of the arc extinction process by introducing magnetic field density as a new parameter. By adjusting magnetic field strength and distribution, the arc characteristics (length, temperature, plasma density) are modified to achieve faster and more reliable arc extinction, improving breaking capacity while maintaining mechanical switch structure
2Reliability
If semiconductor-based electronic breaking devices are used, then breaking speed and breaking capacity are improved, but production costs increase
Solution Approach 1:
The patent replaces the semiconductor-based electronic breaking mechanism with a magnetic field-assisted mechanical arc extinction system. Instead of using solid-state semiconductor switches, the invention uses a combination of mechanical contacts and magnetic field generation to achieve rapid arc extinction, eliminating the need for expensive semiconductor components while maintaining high breaking capacity
Solution Approach 2:
The patent extracts and removes the semiconductor components from the circuit breaker design, retaining only the essential mechanical switching function. By taking out the expensive semiconductor-based electronic breaking device and replacing it with a simplified mechanical system enhanced by magnetic field, the production cost is significantly reduced while maintaining adequate performance
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 solution provides rapid and reliable protection against short circuits, overloads, and differential faults while maintaining low production costs, ensuring minimal disruption to unaffected electrical installations.
Implementation Method 1
a magnetic field generator (37) arranged to generate a magnetic field across the arc when current flows through the arc
Implementation Method 2
an arc chute configured to extinguish an electric arc that appears in the air between the circuit breaker's electrical contacts
Data Source
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AI summary
The present invention relates to a device for protecting an electrical installation, comprising a pair of input terminals (12, 14), an input line (16) provided with two input conductors (16L, 16N) each connected to one of the input terminals (12, 14), at least two output lines (18, 20, 22) connected to the input line (16), provided with two output conductors (18L, 18N, 20L, 20N, 22L, 22N), an output current measuring device (24, 26, 28) and capable of supplying a downstream electrical installation, an electronic disconnection device (40) comprising power switches (42, 44) based on semiconductor components connected in series between the input line (16) and the output line (18, 20, 22), and a unit of control (50) capable of controlling the electronic switching device (40) and capable of receiving a signal representative of an output current from each output line (18, 20,22) measured by the output current measuring device (24, 26, 28).