Built-in fiber temperature signal transmission device of medium and high pressure system

Abstract

The built-in fiber temperature signal transmission device for medium and high voltage system includes one built-in fiber with one end coupled to the emitting tube of signal treating and converting circuit and the other end coupled to low voltage side receiving tube, and one insulator covering the built-in fiber and its circuit in high voltage breaker or other electric equipment. The device has high measurement precision, high insulation strength and high measuring safety.

Description

Technical field: [0001] The invention relates to a novel medium and high voltage system built-in optical fiber temperature signal transmission device, which belongs to the field of online monitoring of electric power system parameters. Background technique: [0002] The accuracy of signal transmission and the safety and reliability of potential isolation in the online detection of the temperature of the high-voltage circuit breaker contact system are very important. According to the search, the current literature on the signal transmission of the online detection of the temperature parameters of the high-voltage circuit breaker contact system There have been many discussions, basically using the scheme of infrared digital signal space transmission and radio signal transmission, and the discussion of using infrared digital signal space transmission, such as the utility model patent "on-line temperature monitoring device for medium and high voltage systems" invented by Zhang Pe...

AI Technical Summary

Problems solved by technology

[0002] The accuracy of signal transmission and the safety and reliability of potential isolation in the online detection of the temperature of the high-voltage circuit breaker contact system are very important. According to the search, the current literature on the signal transmission of the online detection of the temperature parameters of the high-voltage circuit breaker contact system There have been many discussions, basically using the scheme of infrared digital signal space transmission and radio signal transmission, and the discussion of using infrared digital signal space transmission, such as the utility model patent "on-line temperature monitoring device for medium and high voltage systems" invented by Zhang Peiming and others (Patent No. : ZL 94242976.1), using the non-contact potential isolation method of signal space transmission, but this solution must solve the problem of mutual interference between different phase signals, and once dust or other dirt is stained on the transmitting tube or receiving tube, it will affect the transmission of the signal, thus Affecting the quality of online monitoring, the utility model patent "on-line detection signal transmission device for medium and high voltage systems" (patent number: ZL2004 2 0064929.2) invented by Zhang Peiming and others solves the above problems, and uses a built-in gap in the insulator to ensure accurate signal transmission However, infrared radiation can only be carried out in a straight line. This scheme is limited by space, it is difficult to increase the length of the gap, so it is difficult to improve its insulation strength, and it is affected by the reflection of infrared signals in the gap, which reduces the measurement accuracy. The proposed Discussions on radio signal transmission, such as Chen Haikun and Zhou Xiaowei’s utility model patent "handcart-type high-voltage circuit breaker contact on-line temperature detection device" (application number: 200520074576.9) adopts the principle of radio transmission and reception, and transmits the measured signal through space. It is a good solution to realize the potential isolation of signals through the transmission of obstacles, but this solution is easily interfered by external radio waves, and the signal processing is difficult. Many existing papers introduce the use of optical fiber for signal transmission, such as Ma Aiguo published the article "Application of Optical Fiber Temperature Monitor in Switchgear" in the fifth issue of "Electrical Switches" in 2006, but in the rainy season or climate environment with high humidity, its insulation strength will be greatly reduced.

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