Wireless passive temperature sensing system for main transformer cabinet of electric locomotive

Abstract

The invention discloses a wireless passive temperature sensing system for a main transformer cabinet of an electric locomotive. The wireless passive temperature sensing system comprises a surface acoustic wave temperature sensing unit, an antenna unit and an acquisition unit, the surface acoustic wave temperature sensing unit is mounted at a to-be-measured temperature in a main transformer cabinetof the electric locomotive, and is connected with the acquisition unit through the antenna unit; and the surface acoustic wave temperature sensing unit comprises a substrate, a piezoelectric substrate, an antenna module, an interdigital transducer and a reflecting grating. The piezoelectric substrate comprises a sound wave conduction substrate and a piezoelectric film positioned on the sound waveconduction substrate; the sound wave conduction substrate is located on the substrate, and the antenna module, the interdigital transducer and the reflecting grating are located on the piezoelectricfilm; and a sound absorption layer is laid on the surface of the piezoelectric film and used for absorbing bulk acoustic wave signals in the acoustic surface waves. The system has the advantages of high frequency, low time delay, high sound velocity, high reliability, high adaptability and the like.

Description

technical field [0001] The invention mainly relates to the technical field of temperature sensing, in particular to a wireless passive temperature sensing system for a main transformer cabinet of an electric locomotive. Background technique [0002] The traction power of electrified railways is electric locomotives. The safety of power supply has always been the guarantee of fire safety and reliable operation of locomotives. It is of great practical significance to ensure the safety of power supply and thus the safe and stable operation of trains. The power supply voltage of the locomotive is usually above 25KV, and the required energy is provided by the electric traction power supply system. The energy supply method uses the pantograph to obtain electric energy from the catenary, and then transmits it to the electrical system to drive the train. The electric locomotive electrical system is composed of the main drive system, auxiliary electrical control system and control ci...

AI Technical Summary

Problems solved by technology

[0004] At present, there are mainly the following detection methods for temperature monitoring at home and abroad: the more traditional methods are temperature display stickers and manual temperature measurement, but this traditional method is inefficient and cannot realize online temperature monitoring; in addition, infrared thermal imaging temperature measurement uses thermal The imaging principle is used for temperature measurement, but the detection area is limited, so it can only monitor the temperature in the unobstructed and visible range; the fiber grating sensor temperature measurement uses the principle of thermal expansion and contraction of the grating structure for mounting temperature measurement, but it needs Wired connection, wiring is complicated, and the optical fiber is easy to break; active wireless temperature measurement uses a battery to supply power to the sensor for wireless temperature measurement, but the battery life is limited, the battery must be replaced regularly, and there may be leakage, fire or even explosion in a high-voltage environment Hidden danger

From the summary, it can be seen that the current popular temperature measurement methods at home and abroad are difficult to adapt to the strong electromagnetic, severe vibration and closed environment of the main transformer cabinet during the high-speed operation of electric locomotives. This research is a blank in China.

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