Relay Point-on-Wave Switching With Automatic Coil Timing Control
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Solution Overview
Problem
Existing switching devices face challenges in consistently and efficiently opening and closing electric power connections due to delays and variability in coil inductance, resistance, and temperature, leading to issues like torque oscillations and reduced lifespan of contacts.
Innovation Solution
A control system that uses a processor to determine a switching profile based on datasets related to the load and protection equipment, adjusting the switching profile to control the armature movement with respect to an electrical waveform, and providing a higher voltage than the rated voltage to minimize inductance variability, along with a constant current source to ensure consistent operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switching device is used to open and close electric power connections, then power control is achieved, but delays and variability in coil inductance and resistance cause inconsistent switching timing
Solution Approach 1:
The patent applies parameter changes by providing a higher voltage than the rated voltage to the coil to minimize the effect of inductance variability. This voltage override technique compensates for variations in coil inductance and resistance, ensuring consistent switching timing despite manufacturing tolerances and temperature changes.
Solution Approach 2:
The control system uses feedback by monitoring the actual switching timing and adjusting the voltage applied to the coil accordingly. This closed-loop control ensures that switching occurs at the desired point on the waveform despite variations in coil parameters.
2Object-generated harmful factors
If point-on-wave switching is implemented to reduce torque oscillations, then load operation smoothness is improved, but switching device coordination becomes more difficult
Solution Approach 1:
The control system implements feedback control to monitor the switching timing of multiple switching devices and adjust their operation to achieve coordinated point-on-wave switching. This ensures that switching occurs at optimal moments to minimize torque oscillations while maintaining proper coordination between devices.
Solution Approach 2:
The system dynamically adjusts switching timing based on real-time conditions, allowing the switching devices to adapt their operation to achieve coordinated point-on-wave switching that minimizes torque oscillations under varying load conditions.
3Productivity
If manual configuration of relay settings is used, then device simplicity is maintained, but configuration time and potential for error increase
Solution Approach 1:
The control system implements self-service by automatically detecting the characteristics of connected switching devices and configuring relay settings without manual intervention. The system self-identifies device parameters and optimizes switching profiles, eliminating the need for manual configuration while improving accuracy and speed.
Solution Approach 2:
The automatic configuration uses feedback from device detection to dynamically adjust relay settings. The control system monitors device characteristics and automatically configures optimal switching profiles, reducing configuration time and eliminating human error.
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 more consistent and efficient POW switching operations across various coil resistances and temperatures, reducing torque oscillations and extending the lifespan of switching device components.
Implementation Method 1
A control system may be used to control a current provided to a coil of the switching device based on the switching profile
Implementation Method 2
providing a higher voltage than the rated voltage to minimize inductance variability
Data Source
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AI summary
A control system may include a processor that may receive a first dataset associated with a type of load device coupled to a relay device. The processor may then receive a second dataset associated with one or more operations of the load device over a period of time. The processor may also determine a switching profile to control moving an armature of the relay device between a first position and a second position based on the first dataset and the second dataset, such that the switching profile comprises a firing angle for moving the armature with respect to an electrical waveform. The processor may then control a current provided to a relay coil of the relay device based on the switching profile.