What are the functions of the fiber optic temperature controller for transformer winding and the fiber optic temperature measurement system

With the development of optoelectronic technology, fluorescent fiber optic temperature sensors have many advantages such as small size, high temperature resistance, ultra-high voltage resistance, corrosion resistance, good insulation performance, high cost-effectiveness, and no stress vibration interference. They can break through the limitations of other fiber optic temperature measurement technologies and are very suitable for measuring the hot spot temperature of the internal winding of oil immersed transformers.

Temperature measurement device of oil immersed transformer winding temperature controller

In response to the design requirements of high-grade transformers, a fiber optic temperature probe that can withstand high-grade voltage was designed, and after power frequency withstand voltage and lightning impulse tests, it fully meets the installation requirements of high-grade voltage inside the transformer.

The fluorescence fiber optic temperature monitoring system mainly consists of a fluorescence fiber optic temperature sensor, a connector, a fiber optic jumper, a fluorescence fiber optic demodulation host, and monitoring software. The fluorescent fiber optic temperature sensor is the temperature sensing part of the system and the only component installed inside the transformer. The penetrating device is installed on the wall of the transformer and is used to connect the internal fluorescent fiber temperature sensor and the external fiber optic jumper, which plays an optical connection and can achieve oil separation and sealing, and can withstand pressure. The fluorescence demodulation host is used to demodulate the optical signal transmitted by the fluorescence fiber temperature sensor and analyze the temperature. The temperature signal is then output to the upper computer monitoring software through the 485 bus, and the temperature data is read, saved, and analyzed in real time.

The temperature sensing part of the fluorescent fiber optic temperature sensor needs to be installed on the internal hot spot of the detected transformer, and the connector end is connected to the temperature measurement host through a connector to analyze the fluorescent signal and display the temperature value in real time. The data is transmitted to the monitoring upper computer through the 485 bus, which can display real-time temperature curves and save the temperature in the backend database. Realize the operation of the entire temperature monitoring system.

Fluorescent fiber optic sensors have successfully applied passive temperature measurement methods to high voltage level oil immersed transformers, solving the problem of real-time temperature monitoring inside transformers due to the limitations of high-voltage environments, and overcoming the shortcomings of traditional temperature measurement techniques in power system applications.

liquid crystal display

The fluorescence fiber optic temperature monitoring system can provide dynamic, real-time, safe and reliable temperature information of the high-voltage internal environment, effectively evaluate the operating status of transformers, and provide data support for the design level and manufacturing quality of transformers.

Principle of Fluorescent Fiber Temperature Measurement

The luminescence of fluorescent substances is caused by high-energy light irradiation, which excites fluorescence with lower energy. The intensity of the excited fluorescence decreases exponentially with time.

According to the measurement verification report, the temperature measurement accuracy of the fluorescent fiber optic temperature sensor can reach ± 1 ℃, which can meet the temperature measurement requirements in the power system. The temperature range covers the range of temperature changes inside the transformer, and the temperature accuracy analyzed by the fluorescent fiber optic temperature sensor can fully meet the detection of internal temperature in the transformer.

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