Power equipment switchgear, ring main unit monitoring system, fluorescent fiber temperature measurement device, fluorescent fiber-INNO

By utilizing the single value correspondence between the afterglow lifetime and temperature of rare earth fluorescent materials, the temperature signal is converted into an optical lifetime signal for measurement. After being irradiated with light of a specific wavelength, fluorescent substances emit fluorescence when electrons transition from a low energy level to an excited state at a high energy level, and then return to a low energy level. After the excitation stops, the fluorescence decays exponentially, and its decay time constant is temperature dependent. By measuring the decay time, i.e. the fluorescence lifetime, the temperature at the measurement point can be obtained.
system composition
Fluorescent fiber optic (including sensing head): converts the temperature information of the monitoring part of the temperature probe into an optical signal and transmits it to the fiber optic temperature transmitter. The probe size is small and can be directly installed on the measured point, with accurate temperature measurement and rapid response. Tail fiber is soft and sturdy, with advantages such as high transmission bandwidth, stable signal, anti electromagnetic interference, anti bending, high impact strength, and fast connection. The tail fiber sheath material is usually polytetrafluoroethylene, which can adapt to harsh environments such as high pressure, high temperature, and strong electromagnetic fields.

Power equipment switchgear, ring main unit monitoring system, fluorescent fiber temperature measurement device, fluorescent fiber
Fiber optic temperature transmitter: Connected to fluorescent fiber optic through an ST connector, it receives real-time optical signals carrying temperature information from fiber optic sensors and demodulates them into temperature values to achieve temperature measurement of the monitored area. Each fiber optic transmitter can be connected to multiple fluorescent fibers.
Communication software and header: Fluorescent fiber optic communication software is used to achieve communication with the upper computer, and can perform functions such as data transmission, storage, and analysis. The head of the fiber optic temperature measurement system collects temperature information transmitted by the transmitter through RS485, and displays the temperature of each probe in real time. It is generally embedded and has a user-friendly human-machine interface interaction.
advantage
Strong anti-interference ability: pure optical sensing, suitable for substations MRI、 The microwave cavity and other strong electromagnetic fields have natural immunity, no zero drift, no false alarms, and can work stably in high voltage and strong electromagnetic environments.
Good high-voltage insulation performance: Quartz fiber optic can withstand voltage>100kV and can be directly tied to the surface of 500kV transformer windings, GIS contacts or busbars to achieve “live zero distance” hot spot monitoring without reducing the insulation level of the equipment.
Calibration free, long-term stability: Temperature is only related to fluorescence lifetime and is not related to light intensity, connector attenuation, or fiber bending. It does not require recalibration after 10-25 years of installation, reducing maintenance costs and workload.
Miniature size, easy to embed: The probe has a small diameter and can be inserted into narrow areas such as switch cabinet plum blossom contact fingers, cable joint gaps, dry-type transformer air ducts, etc. It does not disturb the thermal field of the measured object and can achieve accurate measurement.
Wide range and high precision: The standard range is -40 ℃ -+200 ℃, and special models can reach+260 ℃. The resolution is 0.1 ℃, and the accuracy is ± 0.5 ℃ – ± 1 ℃, which can meet the temperature measurement needs in different scenarios.
Corrosion resistance and long life: Full quartz+PTFE sheath, resistant to oil, acid and alkali, aging, with a lifespan of ≥ 25 years and the lowest total lifecycle cost.
Multi channel and intelligent networking: One host can carry 1-32 fiber optic cables and support communication protocols such as RS-485/Modbus, 4-20mA, dry contacts, IEC-61850, etc. It can seamlessly connect to SCADA, NBIoT, cloud platforms, and achieve 24/7 early warning.
Application scenarios
Switchgear monitoring: Real time temperature monitoring can be performed on the dynamic and static contacts, busbars, knife switches, and other parts inside the switchgear to promptly detect potential overheating hazards and avoid equipment damage and power outages caused by overheating.
Monitoring of ring main unit: used for temperature monitoring of cable joints, switch contacts and other parts inside the ring main unit, ensuring the safe and stable operation of the ring main unit.
Other power equipment monitoring: It can also be applied to temperature monitoring of internal windings, reactors, motor rotors, stators and other power equipment in oil immersed transformers, providing reliable basis for equipment status maintenance and fault prediction.