Relay Point-on-Wave Switching Using Harmonic-Based Firing Angles
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Solution Overview
Problem
Existing switching devices face challenges in consistently and efficiently opening and closing to manage electric power, leading to issues like electric arcing, current oscillations, and torque oscillations, particularly when switching three-phase electric power.
Innovation Solution
A control system that includes a processor to determine harmonics data and create a switching profile to control the movement of armatures in a relay device, ensuring precise timing with respect to the electrical waveform, and using a higher voltage source and constant current source to drive the relay coil for consistent operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional switching devices are used to open and close electrical connections, then the basic switching function is achieved, but electric arcing and current oscillations occur leading to reduced reliability
Solution Approach 1:
The control system determines harmonics data and creates a switching profile before the actual switching operation occurs. This preliminary analysis of the electrical waveform allows the system to predict the optimal switching moment and prepare the armature movement timing in advance, preventing electric arcing and current oscillations before they can occur.
Solution Approach 2:
The system continuously monitors the electrical waveform and harmonics data, using this feedback to dynamically adjust the switching profile and armature control signals. This closed-loop control ensures that switching operations account for real-time variations in electrical conditions, maintaining reliability while minimizing harmful effects like arcing and oscillations.
2Object-affected harmful factors
If point-on-wave switching is implemented to reduce electric arcing, then harmful effects are minimized, but precise timing control and consistent armature movement become difficult due to inductance variability
Solution Approach 1:
The control system dynamically adjusts control parameters including voltage level, current level, and timing based on the determined harmonics data and electrical waveform analysis. By changing these parameters in real-time, the system compensates for inductance variability and maintains precise switching timing while minimizing electric arcing and current oscillations.
Solution Approach 2:
The switching profile is not fixed but dynamically generated based on real-time harmonics data and waveform analysis. The armature control signals are continuously adjusted to account for variations in electrical conditions and inductance, enabling the system to maintain precise timing control while adapting to changing operational conditions.
3Productivity
If manual configuration of switching parameters is used, then device complexity is reduced, but switching operations are inefficient and inconsistent
Solution Approach 1:
The control system automatically determines harmonics data, analyzes electrical waveforms, generates switching profiles, and adjusts control parameters without requiring manual configuration. The system serves itself by autonomously optimizing switching operations based on real-time conditions, dramatically improving efficiency despite the increased complexity of the automated control mechanisms.
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 enables more consistent and efficient POW switching operations, reducing the likelihood and magnitude of electric arcing and current oscillations, and minimizing the effect of inductance variability on switching device performance.
Implementation Method 1
control a current provided to a relay coil of the relay device based on the switching profile, such that the relay coil causes the first armature to move
Data Source
AI summary
A control system may include a processor that may receive a first dataset associated with a current received at a load device coupled to a relay device. The processor may also determine harmonics data associated with the current and determine a switching profile to control moving a first armature of three armatures in the relay device based on the harmonics data. The switching profile is configured to control movement of the first armature between a first position and a second position, and wherein the switching profile comprises a firing angle for moving the first armature with respect to an electrical waveform, a second armature, and a third armature. The processor may then control a current provided to a relay coil of the relay device based on the switching profile, such that the relay coil causes the first armature to move.