The transformer is an important electrical equipment. During the long-term operation of the equipment, the internal connecting rod, fixed part, coil, iron core and other parts of the transformer are heated due to the influence of resistance, magnetic leakage and other factors. This kind of heating will cause the rise of oil temperature, lead to the decomposition of the insulating oil of the transformer, affect the oil quality, increase the internal pressure of the transformer, reduce the insulation performance of the insulating oil, and cause the transformer explosion The explosion burned down, causing accidents and large-scale blackout.

    At present, the main method of transformer safety monitoring is to avoid accidents by real-time monitoring of temperature by optical fiber sensor.。

System interface diagram

Advantages of the system:
1. Anti electromagnetic interference, anti-corrosion, safe and stable;
2. The monitoring site has no electric signal and high reliability;
3. Long life;
4. Real time, 24-hour monitoring;
5. Simple and reliable alarm modes;
6. Good compatibility and expansibility. In this scheme, fiber Bragg grating temperature detection technology is used to overcome the defects of traditional temperature monitoring, and directly measure the temperature of the possible hot spot of transformer.

Technical features:
1. Continuous monitoring of the temperature of the inner winding, iron core, low-voltage bus bar, electrical contact, pull rod, transformer oil and the position to be measured by the user, accurate positioning of the location and temperature of the fault point, providing the basis for decision-making of transformer operation, and knowing the maintenance of the transformer;
2. Temperature measurement accuracy ± 1 ℃, resolution - 0.1 ℃, temperature measurement range - 50 ~ 300 ℃;
3. The temperature monitoring is free from electromagnetic interference and potential safety hazards of the transformer, and the sensor has a service life of 20 years

Performance index:
1、Wavelength range nm 1510~1590
2、Temperature resolution ℃ 0.1
3、Temperature accuracy  ℃ 1
4、Temperature range ℃ -20~120
5、 Packaging material --- Metal
6、Connector type --- FC/APC or Customized
7、Boundary dimension mm Φ8×100
8、Pigtail type mm Φ3 or amored cable