Coil Actuator Optical Arc Fault Detection
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Solution Overview
Problem
Traditional arc fault suppression devices for low and medium voltage electrical systems are expensive, complex, and difficult to install, especially in existing systems, limiting their adoption and retrofitting capabilities.
Innovation Solution
A coil actuator with a coil electromagnet and a power and control unit that uses optical detection signals to rapidly trip and interrupt current flow, integrating arc fault suppression functionality into low and medium voltage switching apparatuses, simplifying installation and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional arc suppression devices are used, then arc fault suppression capability is achieved, but device complexity and installation difficulty increase
Solution Approach 1:
The patent combines the arc detection unit, control unit, and coil actuator into an integrated system where the detection unit is positioned to directly detect arcs near the switching apparatus, and the control unit is integrated within the actuator housing. This merging of functions reduces device complexity while maintaining arc fault suppression capability.
Solution Approach 2:
The patent introduces an optical fiber cable as an intermediary to transmit light signals from the detection unit to external processing systems. This intermediary approach allows the detection function to be separated physically while maintaining functional integration, reducing installation complexity in existing electrical systems.
2Reliability
If traditional arc suppression devices are used, then arc fault suppression capability is achieved, but installation cost and difficulty increase
Solution Approach 1:
The patent segments the arc suppression system into modular components: a coil actuator with integrated detection unit, optical fiber cable, and external processing unit. This segmentation allows for easier manufacturing and installation, as components can be installed independently and retrofitted into existing electrical systems without complete system replacement.
Solution Approach 2:
The optical fiber cable serves as a flexible intermediary that enables connection between the detection unit and external systems without requiring complex electrical wiring modifications. This significantly reduces installation cost and difficulty, especially for retrofitting existing electrical systems.
3Loss of energy
If fast intervention time is achieved, then energy release during arc faults is reduced, but device complexity increases
Solution Approach 1:
The detection unit is positioned to continuously monitor for arc faults in advance, and the control unit is pre-configured with processing circuits that can immediately trigger the coil actuator upon detecting an arc condition. This preliminary positioning and preconfiguration enable fast intervention time without requiring complex real-time processing algorithms.
Solution Approach 2:
The patent replaces complex electronic control systems with a simplified optical detection and direct-control mechanism. The detection unit uses optical fibers to detect arc light, and the control unit directly actuates the coil without complex intermediate processing, achieving fast intervention through mechanical-direct control rather than complex electronic control.
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 coil actuator provides fast intervention times, reducing energy release during arc faults and simplifying installation, making it cost-effective and adaptable for a wide range of electrical systems, including those with lower market prices and existing infrastructure.
Implementation Method 1
a coil electromagnet (2) housed in a casing, which comprises a coil (2B) operatively associated with a movable plunger (2A)
Implementation Method 2
the coil (2B) is energized by an excitation current (IE) so as to move the plunger (2A) which is normally in a rest position
Implementation Method 3
detection of the arc flash thanks to suitable optical detection means that are positioned in the installation compartments to be observed
Data Source
AI summary
A coil actuator for a low and medium voltage switching apparatus comprising a coil electromagnet (2), a power and control unit (3), which comprises a power circuit (31) operatively connected to said coil electromagnet (2) and a processing unit (32) operatively connected to said power circuit and controlling the trip of said coil electromagnet (2) through said power circuit (31). The power and control unit (3) comprises an optical port (30), which is suitable to be operatively connected to an optical fiber cable (112), and a first detection unit (33), which is operatively connected to said optical port and to said processing unit. The first detection unit (33) is suitable to receive a light signal (L) from said optical port and to output a first detection signal (D1) indicative of the presence of an arc fault, depending on said light signal. The processing unit (32) is suitable to receive said first detection signal (D1) from said first detection unit and to control the trip of said coil electromagnet (2), depending on said first detection signal. In a further aspect, the invention relates to an arc fault coil suppression device including said coil actuator.