AT-YG-KG/QR/BG Intelligent optical fiber temperature measuring device is designed for early prediction of the fault and fire which caused by aging insulation or poor contact on high voltage switch cabinet, knife-switch, cable joint, transformer and other high voltage electric power equipment. Switch cabinet, knife-switch, cable joint and transformer belong to high current, high voltage electrical equipment. The electrical environment is relatively bad (such as electromagnetic field radiation, surge, electric pulse with a high electromagnetic interference). Fiber optical with the characters of electric insulation, intrinsic safety and immune to electromagnetic interference, so the probe of sensor can be directly installed on the measuring point by direct contact method which directly monitoring breaker contact and abnormal temperature of cable joint to predict the fault and prevent electrical fire disaster.

Application Fields:

●Temperature monitoring in strong electromagnetic environment

●High pressure and high temperature components monitoring

●Monitoring of petrochemical production

●Biomedical experiment monitoring

●Constantly temperature monitoring of drugs

●Environment Temperature Monitoring

●Industrial microwave temperature monitoring

Technical Principle:

The principle of intelligent optical fiber temperature measuring device is that after the fluorescent material excited by light with a certain wavelength, the excited radiation gives off fluorescent energy. After incentive withdrawal, the persistence of fluorescence afterglow depends on the properties of fluorescent substances, ambient temperature and other factors. This excited fluorescence is usually attenuated in an exponential fashion, the decay time constant is the fluorescence lifetime or the fluorescence afterglow time (ns). Under different ambient temperatures, fluorescence afterglow attenuation is also different. By measuring the fluorescence afterglow lifespan, the detector can accurately measure the environment temperature where the probe is located to achieve monitoring and alarm.

Features:

●High insulation resistance to voltage 

It is an optical signal measuring device. This sensor can tolerate exceed 140kV power frequency voltage within 30cm creepage distance.Completely meet insulation and voltage requirements of the switchgear.

●Strong anti-fouling flash ability

Intelligent optical fiber temperature measuring device uses different and strong stain resistance silica fiber coat or teflon coat according to different voltage levels to transmit signal. It can ensure the security of the system.

●Temperature sensitive material with high reliability

The temperature sensing material of the temperature sensor is the rare-earth material which is only sensitive to temperature. The long-term stability of the material has been fully validated, and relevant systems have been successfully applied to equipment monitoring for more than 30 years.

●Distributed system structure with high stability

It is a distributed system with flexible configuration, and each temperature measuring unit is independent without influence to each other. So the failure of the whole system caused by one link is avoided. The system has good robustness, reliability and stability.

●Accurately locate the measuring point

Small size of temperature sensing probe (3mm),it is can locate the installation position accurately .

●Small temperature measurement period in real time

The temperature measurement period is less than 1 second which fully ensure the timeliness of alarm.

Technical Parameters:

 System connection diagram：