Multi-Coil Line Protection for Compact Fault and Arc Detection
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Solution Overview
Problem
Existing electrical line protection devices face issues with bulkiness and overheating, and struggle to integrate protection functions such as electric arc detection and overload protection without increasing size, particularly for ratings up to 45A.
Innovation Solution
The proposed electrical line protection device incorporates a housing with multiple coils and a movable actuating element, including a first coil for differential faults, a second coil for short-circuits, and a third coil with an electronic processing unit to measure current and determine trigger thresholds, allowing for compact integration of multiple protection functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple protection functions (differential, short-circuit, overload, arc detection) are integrated into a single device, then comprehensive protection capability is improved, but device bulkiness increases
Solution Approach 1:
The patent combines multiple protection functions (differential protection via first coil, short-circuit protection via second coil, overload protection via current measurement, and arc detection via electronic processing) into a single integrated device with shared housing and actuating mechanism, eliminating the need for separate protection devices and reducing overall bulkiness
Solution Approach 2:
The device employs a universal actuating element and trip lock mechanism that responds to multiple types of faults through different sensing methods, allowing a single device structure to perform multiple protection functions simultaneously without requiring separate dedicated mechanisms for each function type
2Adaptability or versatility
If traditional bimetallic system is used for overload protection, then overload protection function is provided, but heating problem occurs
Solution Approach 1:
The patent replaces the traditional bimetallic mechanical system with an electronic processing unit that measures current through the third coil and compares it with predetermined thresholds, substituting thermal-mechanical action with electronic sensing and processing to eliminate heating issues while maintaining overload protection capability
3Measurement precision
If Rogowski or torus type sensors are used for current measurement, then current detection is achieved, but device bulkiness increases
Solution Approach 1:
The patent nests the third coil within the same housing and spatial arrangement as the first and second coils, utilizing the existing magnetic circuit space efficiently. The coil assembly is integrated into the same actuating element structure, eliminating the need for separate external sensor housings and reducing overall device volume while maintaining measurement capability
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 solution enables comprehensive protection against short circuits, leakage currents, and overloads while maintaining a reduced footprint, effectively addressing the bulkiness and overheating issues, and facilitating the addition of electric arc detection without size increase.
Implementation Method 1
a first coil forming an actuator capable and intended to generate said magnetic field in response to a differential type fault occurring in said line
Implementation Method 2
a second coil capable and intended to generate said magnetic field in response to a short-circuit type fault occurring in said line
Implementation Method 3
a movable actuating element configured to be moved, under the effect of a magnetic field, from a rest position to an actuating position
Data Source
Figure 1
AI summary
The present invention relates to an electric line protection device (L), the device comprising, in a housing that it comprises, on the one hand, a plurality of coils (1, 2, 3) and a movable actuating element configured to be moved, under the effect of a magnetic field, from a rest position to an actuation position, namely a first coil (1) forming an actuator able and intended to generate the magnetic field in response to a differential fault occurring in the line (L), a second coil (2) able and intended to generate the magnetic field in response to a circuit breaker fault occurring in the line (L) and a third coil (3) and, on the other hand, a trip lock (4) and a control unit (5). An electric current proportional to that passing through the second coil (1) passes through the third coil (3), which forms a sensor for measuring the proportional current. The device further comprises an electronic processing unit (6) operatively connected to the third coil (3) and configured to control, via the control unit (5), the first coil (1) according to the result of the processing of the signals representing the measurement value of the proportional current.