Chongqing's first fiber optic temperature transformer successfully put into operation

In the early morning of December 23, Chongqing's first optical fiber temperature measurement transformer was put into operation. The transformer was installed with Chongqing's first direct-buried optical fiber temperature measurement system. After the transformer was put into operation, the optical fiber temperature measurement system was operating normally.

The transformer is a No. 2 main transformer in the 110-kilovolt substation of Liangping Gold Belt. The installed optical fiber temperature measurement system has 14 channels of temperature measurement function, which can monitor the change of the hot spot temperature inside the transformer winding in real time.

It is reported that the traditional transformer temperature monitoring mainly includes two items: oil surface temperature and winding temperature. The oil surface thermometer uses a thermocouple method to measure the transformer oil surface temperature, and the winding thermometer is obtained by simulating the top oil temperature of the transformer and the average temperature rise of the winding to the oil. The superimposed temperature is a simulation calculation. The biggest drawback of the traditional temperature test lies in the fact that the hot spot temperature of the transformer winding cannot be accurately and accurately measured, and the temperature response of the oil level thermometer is slow. The optical fiber temperature measurement system has the advantages of rapid temperature response and accurate measurement. It solves the problem that the temperature of the transformer winding thermometer is not accurate for a long time, and it can not truly reflect the problem of the hot spot temperature of the winding. It is also used for load forecasting, life assessment and condition evaluation of the transformer. Provides empirical data.

It is understood that fiber optic buried winding temperature measurement technology has been applied in transformer temperature monitoring has more experience in foreign countries, domestic manufacturers have also been piloted before, but because the fiber optic probe is directly buried in the transformer high voltage winding, taking into account the safety and reliability factors have not been large Expanded area.

This is the first time that Chongqing has attempted to apply optical fiber temperature measurement technology to monitor the hot spot temperature of transformers. It is designed, installed, and tested by the Electric Scientific Research Institute. In order to ensure complete security, the Electric Scientific Research Institute has conducted a number of investigations and inspections before, and cooperated with Hebei University of Technology and Canada's NOPTIX Corporation to develop a plan to calculate the temperature from the high temperature inside the transformer to the installation of the optical fiber, drying, temperature rise test, on-site masking, etc. The process has been strictly controlled to ensure that the transformer is finally put into operation safely. It has accumulated valuable experience for the large-scale application of transformer optical fiber temperature measurement technology in the future.