Parallel Coil Assembly Monitoring for Early Short-Circuit Detection
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Solution Overview
Problem
Existing methods for detecting winding short-circuits in parallel-connected coils are unreliable, costly, and prone to faults, leading to potential burn-outs and fire risks, with current wireless and optical signal transmission methods being less reliable and costly.
Innovation Solution
A method involving off-power voltage detection at coil taps, determining AC components, applying weighting, and generating signals for deviations from mean values, with redundant signal transmission paths using optical, acoustic, and radio signals, and energy recovery from induction coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wireless signal transmission is used for monitoring coils, then installation cost and complexity are reduced, but reliability of signal transmission deteriorates
Solution Approach 1:
The patent applies local quality by using different transmission media (acoustic, optical, radio) for different signal transmission needs. Acoustic signals are used for immediate local alerts, optical signals for reliable data transmission, and radio signals for remote communication, optimizing the reliability-cost tradeoff at different locations and levels of the monitoring system.
Solution Approach 2:
The monitoring system uses a composite approach by combining multiple signal transmission methods (acoustic, optical, radio) into a unified system. This composite strategy ensures that no single transmission failure compromises overall system reliability, while maintaining cost-effectiveness through selective use of each transmission type.
2Reliability
If hard-wired signal transmission is used for monitoring coils, then reliability of signal transmission is improved, but installation cost and complexity increase
Solution Approach 1:
The patent applies local quality by using different transmission media (acoustic, optical, radio) for different signal transmission needs. Acoustic signals are used for immediate local alerts, optical signals for reliable data transmission, and radio signals for remote communication, optimizing the reliability-cost tradeoff at different locations and levels of the monitoring system.
Solution Approach 2:
The monitoring system uses a composite approach by combining multiple signal transmission methods (acoustic, optical, radio) into a unified system. This composite strategy ensures that no single transmission failure compromises overall system reliability, while maintaining cost-effectiveness through selective use of each transmission type.
3Object-affected harmful factors
If UV light detection is used for fire detection in reactance coils, then fire detection capability is provided, but response time deteriorates due to smoke generation delay
Solution Approach 1:
The patent applies preliminary action by detecting acoustic signals (ultrasonic emissions) from the winding before visible smoke is generated. This early detection of the incipient fault condition allows the system to alert operators and initiate protective measures before the fire fully develops and smoke obscures UV detection, thereby overcoming the response time limitation of traditional UV-based fire detection.
4Ease of operation
If battery-powered radio sensors are used for signal transmission, then wireless transmission capability is provided, but reliability deteriorates due to battery failure risk
Solution Approach 1:
The patent applies self-service by enabling the radio sensor node to harvest energy from the electromagnetic field of the reactance coil itself. This self-powering mechanism eliminates the need for external batteries, removing the reliability concern of battery failure while maintaining wireless transmission capability. The sensor node serves itself by drawing power from the operational coil's magnetic field.
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
Enables early detection of winding short-circuits, preventing burn-outs and reducing costs by eliminating the need for additional wiring and batteries, ensuring reliable and efficient fault detection.
Implementation Method 1
energy recovery from induction coils
Data Source
AI summary
A method for monitoring the operation of an electrical assembly having a plurality of coils disposed electrically in a parallel circuit, includes detecting, off-power, the voltage at each coil by using a tap on a winding, determining the AC component of the detected voltage for each coil, determining the mean value of the voltage at the coils, evaluating the determined AC component for each coil with respect to the determined mean voltage, while applying a weighting, and generating a signal if a weighted deviation of a value describing the AC component of a detected voltage in a coil from a value describing the mean voltage exceeds a specified limiting value. An electrical assembly and a method for operating the assembly are also provided.