Wireless Conductor Temperature Sensing in Dry-Type Transformers
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Solution Overview
Problem
Traditional methods for measuring the temperature of dry-type transformers are inaccurate, inefficient, and costly, particularly due to the use of wired thermal couples which are inconvenient and fail to provide precise readings.
Innovation Solution
A passive wireless measuring apparatus comprising a temperature sensor and a passive wireless communication module, such as a RFID or SAW tag, is arranged on or near the conductor of the dry-type transformer, using an insulating layer like epoxy resin for protection, and powered by wireless radio frequency energy, allowing for accurate and flexible temperature measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wired thermal couple is used to measure temperature, then the measurement can be obtained, but the method is inconvenient, inaccurate, and costly
Solution Approach 1:
The patent replaces the wired thermal couple (mechanical/electrical connection system) with a wireless temperature sensor that communicates via radio frequency. The sensor is embedded in the insulating layer and transmits temperature data wirelessly to a reader, eliminating the need for physical wiring while maintaining measurement accuracy and improving operational convenience.
Solution Approach 2:
The patent introduces an insulating layer as an intermediary medium that serves dual purposes: it provides electrical insulation for the conductor and simultaneously embeds the temperature sensor within it. This intermediary structure allows the sensor to be positioned close to the conductor for accurate temperature measurement while maintaining electrical isolation, resolving the contradiction between measurement accuracy and operational safety.
2Reliability
If traditional wired thermal couples are used, then temperature measurement is possible, but the system becomes complex and costly
Solution Approach 1:
The patent merges the temperature sensor, the insulating layer, and the wireless communication module into a single integrated unit. The sensor is embedded within the insulating layer material itself, and the wireless module is incorporated into the same structure, eliminating the need for separate wiring harnesses, connection points, and external sensor mounts, thereby reducing system complexity while maintaining reliability.
Solution Approach 2:
The insulating layer serves multiple functions simultaneously: it provides electrical insulation for the conductor, embeds and protects the temperature sensor, and integrates the wireless communication module. This multi-functional design eliminates the need for separate components for each function, reducing overall system complexity while ensuring reliable temperature monitoring.
3Measurement precision
If a temperature sensor is placed close to the conductor for accurate measurement, then measurement precision improves, but insulation requirements become more stringent
Solution Approach 1:
The insulating layer acts as an intermediary between the conductor and the temperature sensor, allowing the sensor to be embedded within or adjacent to the conductor while maintaining adequate electrical insulation. The sensor is positioned close enough to the conductor for accurate temperature measurement but isolated by the insulating material, thus resolving the contradiction between measurement precision and insulation safety.
Solution Approach 2:
The insulating layer is formulated as a composite material that combines electrical insulation properties with thermal conductivity characteristics suitable for temperature sensing. By embedding the temperature sensor within this composite insulating layer, the system achieves both close proximity to the conductor for accurate measurement and sufficient electrical insulation for safety.
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 accurate and efficient temperature measurement of dry-type transformers, improving reliability and safety while reducing costs, as the apparatus is flexible, non-invasive, and does not require batteries or complex wiring.
Implementation Method 1
a passive wireless communication module configured to transmit the measured temperature to a reader
Implementation Method 2
the temperature sensor is arranged on or approximate to a conductor of the dry-type transformer and is covered by an insulating layer of the conductor
Data Source
AI summary
An apparatus includes a temperature sensor configured to measure a temperature of a dry-type transformer, and the temperature sensor is arranged on or proximate a conductor of the dry-type transformer and is covered by an insulating layer of the conductor. The apparatus further includes a passive wireless communication module configured to transmit the measured temperature to a reader. The temperature of the dry-type transformer can be measured accurately, thereby improving the reliability and safety of the dry-type transformer. Accordingly, temperature measurement for the dry-type transformer can work appropriately in a cost-effective and efficient way.