Current Limiting Device Dynamic Phase Load Balancing
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Solution Overview
Problem
Existing current limiting devices for electrical installations face challenges such as disconnecting loads during peak conditions, inability to handle single phase loads, and energy inefficiencies due to continuous energy transfer, especially in systems with many portable loads and transient issues.
Innovation Solution
A device that transfers electrical energy between conductors by injecting current when a threshold is reached, allowing for dynamic load management without disconnecting loads, improving energy efficiency by only transferring energy when needed and accommodating both single and multi-phase loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high mains fuse rating is selected to prevent blowing during peak load conditions, then the reliability is improved, but the cost increases due to higher fees and larger conductor area requirements
Solution Approach 1:
The patent implements dynamic load management by continuously monitoring phase currents and automatically transferring loads between phases using controllable switches (thyristors or IGBTs). This dynamic adjustment allows the system to adapt to varying load conditions in real-time, preventing any single phase from exceeding the fuse rating while maintaining overall system reliability without requiring a higher rated fuse.
Solution Approach 2:
The system changes the distribution parameter of electrical load across phases by detecting when a phase current approaches the fuse rating and automatically redistributing the load to other phases. This parameter adjustment (current distribution) allows the system to operate reliably within the existing fuse rating constraints without incurring costs associated with higher ratings.
2Productivity
If traditional load shedding switches are used, then the current limiting is improved, but the adaptability decreases due to inability to handle portable single phase loads
Solution Approach 1:
The patent creates a universal current management system that can handle both permanently installed three-phase loads and portable single-phase loads through a common control mechanism. The system monitors all phase currents and automatically transfers any load (regardless of type or mobility) to balance the electrical system. This multi-functional approach provides adaptability to various load types while maintaining current limiting effectiveness.
Solution Approach 2:
The system continuously monitors phase currents and uses this feedback to dynamically adjust load distribution. When a portable load is detected or when phase imbalance occurs, the control unit responds by transferring appropriate loads to restore balance. This feedback mechanism ensures the system adapts to changing load conditions including portable equipment usage, maintaining current limiting capability across diverse scenarios.
3Adaptability or versatility
If energy is continuously transferred between phases to balance loads, then the adaptability is improved, but the energy efficiency worsens due to continuous energy transfer losses
Solution Approach 1:
The system implements periodic monitoring and selective energy transfer between phases based on actual load conditions. Rather than continuous transfer, the control unit periodically assesses phase current imbalances and activates energy transfer only when necessary to restore balance. This periodic action maintains adaptability and load balancing capability while minimizing energy losses by avoiding unnecessary continuous transfer operations.
Solution Approach 2:
The system uses the existing electrical infrastructure and natural load variations to achieve balancing with minimal external energy input. By leveraging the inherent fluctuations in load demand and using the electrical system's own resources for transfer, the system maintains adaptability while reducing energy losses. The self-service approach allows the system to adapt to changing conditions using available resources rather than requiring continuous external energy input for transfer operations.
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 approach ensures continuous utilization of available power, reduces energy losses, and eliminates the need for laborious load planning, as it automatically adjusts to varying load conditions, enhancing the efficiency and reliability of current limiting in electrical installations.
Implementation Method 1
a limiting unit, adapted to limit said electrical current when the measured (first) electrical current reaches a (first) threshold, wherein the limiting unit is adapted to transfer electrical energy from a second electrical conductor to the first electrical conductor by injecting electrical current
Data Source
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AI summary
The invention relates to a device (50) for limiting an electrical current in an electrical conductor of an electrical installation The device (50) comprises a receiving unit adapted to receive a measurement of the electrical current in the electrical conductor, and further comprising a limiting unit adapted to limit said electrical current when the measured electrical current reaches a threshold. The device (50) is distinguished by comprising an obtaining unit adapted to obtain electrical energy from a second electrical conductor, wherein the limiting unit is adapted to inject said obtained electrical energy as an electrical current into the first electrical conductor, whereby the injected electrical current constitutes a replacement for at least a part of the first electrical current, which first electrical current is thereby limited. The invention also relates to an electrical system and a method for limiting an electrical current in an electrical conductor of an electrical installation.