无源无线测温装置在变压器中的应用

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Abstract Temperature is the key parameter of the operating state of the transformer. Real-time monitoring of the transformer temperature can effectively prevent accidents and ensure the safe and stable operation of the transformer equipment. In this paper, the theoretical basis of the device is described, including the theory of thermoelectricity generation and the derivation of impedance matching, and the reliability of the wireless signal transmitter is tested. Then the working principle of the device is introduced. Finally, the device is applied to a 220kV transformer in a substation in Henan province for verification. The results show that: The device's antenna performs well at 433MHz operating frequency. The temperature measuring device can monitor the temperature change of the transformer for a long time, safely and effectively, avoiding the safety hazard of the transformer caused by the excessive operating temperature of the transformer, and providing technical guarantee for the safe operation of the transformer. The practicability of the device is verified.

Key words： passive wireless temperature measuring device transformer thermoelectric power generation impedance matching signal transmitter

Received: 03 September 2019 Published: 18 January 2020

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	Articles by authors
	Zhu Jianhua
	Liang Dong
	Li Fang
	Zhai Haiwen
	Feng Linna

Cite this article:

Zhu Jianhua,Liang Dong,Li Fang等. Application of passive wireless temperature measuring device in transformer[J]. Electrical Engineering, 2020, 21(1): 72-77.

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http://dqjs.cesmedia.cn/EN/Y2020/V21/I1/72

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