Transformer oil temperature online monitoring device

Abstract

The invention relates to a transformer oil temperature online monitoring device, and belongs to the technical field of transformer oil online monitoring. The device comprises a temperature measurement host, an optical cable, a fiber Bragg grating temperature sensor and a microcomputer. The optical cable is connected with the fiber Bragg grating temperature sensor and the temperature measurement host. The temperature measurement host is connected with the microcomputer. Transformer oil temperature and environment temperature are detected by the fiber Bragg grating temperature sensor. The optical cable is mainly used for transmitting an optical signal. The temperature measurement host is mainly used for analyzing optical data transmitted by the optical cable and providing concrete temperature data to the microcomputer according to an electric power industry communication protocol standard (CDT stipulations) so that a fiber grating temperature measurement technology is integrated into transformer oil temperature online monitoring. A fiber grating demodulation technology is utilized so that the device has advantages of being high in insulation degree without influence of electromagnetic environment, suitable for transmission of long-distance and high-quality signals, high in measurement precision, etc.

Description

technical field [0001] The invention belongs to the technical field of transformer oil online monitoring, and in particular relates to an online transformer oil temperature monitoring device. Background technique [0002] The power transformer is an important equipment in the power supply system, and its safe operation status directly determines the safe operation level of the entire power system. In the research of transformer on-line monitoring technology, the on-line monitoring of transformer oil chromatography is currently the most popular and on-site application in the domestic power sector. One of the transformer online monitoring methods with the largest number of products. By monitoring the type, content and change trend of the dissolved gas in the oil, it is possible to analyze and judge the latent faults existing in the equipment and grasp the development of the fault at any time, so as to realize the condition maintenance of the transformer. However, because the ...

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Problems solved by technology

However, because the transformer adopts a closed structure, the heat dissipation effect is poor, the heat accumulation is large, and it is in the state of high voltage, high current and full load operation for a long time, which directly leads to heat accumulation and temperature rise, which threatens the electrical insulation performance. Therefore, real-time monitoring of the transformer The operating temperature is very important to the grid system

[0003] The current transformer temperature detection equipment is mostly based on electrical sensors such as thermocouples and thermal resistances. This temperature measurement method is easily affected by factors such as electromagnetic interference, transmission distance, and wire resistance, which will cause errors in measurement, especially long-distance transmission. The measurement produces an error of 10-20°C. Like the existing online monitoring of transformer oil chromatography to measure oil temperature, the oil chromatography device takes oil from the oil inlet of the transformer, passes through a section of pipeline, reaches the inside of the equipment, and then measures it through thermal resistance. Obviously, it is Can not play a role in ensuring the safety of the transformer

[0004] The Chinese patent application number is: 201020518443.7 Provides a transformer internal temperature detection system based on fiber Bragg grating, real-time measurement of multi-point temperature inside the transformer through fiber Bragg grating sensor, the measurement range is 0°C-200°C, and the measurement accuracy is better than 1°C , the positioning accuracy of temperature measurement is better than 0.1 meters, but it has not been applied to the online monitoring of transformer oil chromatography

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