Fiber optic temperature measurement system for oil immersed transformers

The fiber optic temperature measurement system for monitoring the hot spot temperature of transformer windings has been widely used in thousands of transformers worldwide in recent years and has passed industrial design certification. There is already considerable experience in applying fiber optic buried winding temperature measurement technology to transformer temperature monitoring. The entire system mainly includes fiber optic temperature controllers, fiber optic probes, fuel tank wall penetrators, fuel tank wall junction plates, external extension fibers, and optional fuel tank wall protective covers.

The transformer manufacturer has installed a fiber optic temperature measurement system for the intelligent main transformer and has officially put it into operation. The main transformer winding hot spot fiber optic temperature measurement system includes data sampling and analysis alarm functions, and can be connected to the communication components of intelligent components. Using a self-developed fiber optic temperature measurement controller, the installation position of the fiber optic temperature measurement for the hot spot of the main transformer winding is determined based on operational requirements and combined with the technical characteristics of the temperature measurement equipment. It covers all important areas of the main transformer, reducing the probability of damage to the main transformer winding and extending its service life.

The online temperature monitoring system for transformers using fluorescence fiber optic temperature measurement technology can monitor the temperature of various components inside the transformer in real time and accurately. Because it is a direct contact measurement, it has more reference significance than theoretical calculations. In addition, through long-term operation, it has been proven that the monitoring system is safe, reliable, and stable. It can replace winding thermometers and oil thermometers, and can also replace manual inspections. At the same time, by detecting temperature, the lifespan loss of transformers can be evaluated, which has a good reference value for the health status and lifespan evaluation of transformers, and provides an effective technical means for online temperature detection of transformers.

The Function of Fiber Optic Temperature Measurement System for Main Transformer Oil Immersed Transformer

1) Fiber optic temperature measurement technology, as a necessary monitoring technology for smart transformers, can not only provide early warning and fault analysis for transformers, but also enhance the conveying capacity of smart transformers;

(2) When arranging points for fiber optic temperature measurement, the distribution pattern of the hottest point of the coil should be considered, so as to obtain better measurement points and ensure the accuracy of transformer hot spot temperature measurement;

(3) When applying fiber optic temperature measurement technology to smart transformers, corresponding technical parameters should be determined according to different regions and special technical requirements. Power transformers are the core equipment of the power system, and the hot spot temperature of the winding affects the insulation life of the transformer. Therefore, it is necessary to monitor the hot spot temperature of the transformer winding online. By comparing several hot spot temperature measurement methods for transformer windings, it was found that the method of using fluorescent fiber optic sensors to measure transformer windings not only measured the true temperature of the transformer winding, but also had high measurement accuracy and good system stability.

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