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The advantages of point type fiber optic temperature sensors

The advantages of point type fiber optic temperature sensors

The fiber optic temperature measurement system is mainly completed using fluorescent optical fibers. The sensors are isolated under high voltage and the absorbed optical signals are transmitted for temperature monitoring of the measured object. The consistency and stability of the optical fibers have reached international advanced levels, and the temperature measurement accuracy is high.

Fluorescent fiber optic temperature sensors have the characteristics of intrinsic safety, no electromagnetic interference, stable monitoring, accurate temperature measurement accuracy, fast response speed, high sensitivity, high pressure resistance, corrosion resistance, ability to work in extreme measurement environments, and lower total cost compared to distributed fiber optic temperature measurement and fiber optic gratings.

Fluorescent fiber optic temperature measurement Wireless or infrared temperature measurement
Temperature measurement method Contact temperature measurement Contact or non-contact temperature measurement
Security Non electrified, non-metallic, moisture-proof, explosion-proof, with no inherent safety hazards The probe contains a charged body and battery, which poses a risk of explosion




Easy to electromagnetic interference and poor reliability; RF signals are easily blocked
Accuracy Installed at the contact point, without temperature deviation, optical measurement, high accuracy The installation position is far from the contact, causing temperature deviation and low accuracy
Temperature measurement method Real time, online Real time, online
Alarm positioning Accurate positioning Accurate positioning
Installation and maintenance The temperature measuring probe is very small and can be directly installed on the measured point The probe has a large volume, and it is inconvenient to maintain the power outage when replacing the battery
service life No consumable components, long service life Depends on probe RF power consumption and battery capacity
Economy Economically cost-effective and cost-effective High cost, requires regular maintenance, low cost performance

The application range of point type fluorescent fiber optic temperature sensors is wide, with customers covering various substations and large petroleum and petrochemical enterprises around the world. The online fiber optic temperature monitoring of high-voltage transmission line joints and switchgear circuit breaker contacts can meet the needs of temperature monitoring systems in the large power industry, and develop and customize cost-effective fiber optic temperature monitoring systems for major enterprises nationwide.

By utilizing the excellent insulation and high-voltage isolation performance of point type fiber optic sensors for temperature measurement, FJINNO independently developed fluorescent fiber optic temperature sensor can be used for temperature monitoring during the operation of high-voltage equipment in different environments:

1. Contact and contact measurement of high-voltage switchgear

2. Temperature measurement of dry-type transformers

3. Temperature measurement of oil immersed transformers

4. High voltage busbar joint

5. High voltage cable joints

6. Knife switch

7. Oil and gas pipelines, flammable and explosive tank bodies, etc.

Point type fiber optic temperature measurement system

The point type fiber optic temperature sensor converts the temperature information of the monitored area into optical signals and transmits them to the fluorescence fiber optic thermometer. The probe of the fluorescence fiber optic sensor independently developed by FJINNO is the most advanced fluorescence fiber optic thermometer in China, which can be directly installed on the measured point, with accurate temperature measurement and fast response. The point type fiber optic thermometer receives real-time optical signals carrying temperature information sent by fluorescent fiber optic temperature sensors, and demodulates them into temperature values through the principle of fluorescent fiber optic temperature measurement, achieving temperature measurement of the monitored area. The monitoring system can set an alarm signal when the actual temperature measurement value is greater than the alarm set value, and can set the temperature control device to trip and other device settings. The point type fiber optic thermometer can work independently on a single channel, or can be used in a network with multiple multi-channel fiber optic temperature sensor systems.

The point type fiber optic temperature measurement system is a distributed temperature measurement system consisting of a fluorescent fiber optic temperature sensor probe, a fiber optic temperature sensor (fiber optic temperature transmitter module), a fluorescence transmission fiber optic, a monitoring host display screen, etc. The fiber optic temperature sensor demodulates the optical signal of the temperature information carried by the fiber optic temperature sensor probe, converts it into a temperature value, and then uploads it to the monitoring host through the fluorescence fiber optic demodulator to complete the temperature monitoring of the measured part. The fiber optic device and high-temperature resistant insulation material are used as the fiber optic temperature measurement probe, and single-mode fiber optic is used to achieve long-distance signal transmission. Special signal demodulation and filtering algorithms are used to improve the measurement accuracy and stability of the product. Low product cost, strong anti vibration and anti electromagnetic interference capabilities, high accuracy, fast response speed, high resolution, unrestricted transmission distance, and scalability. It can be used in situations such as difficult power supply, sealing, high voltage, strong magnetic field, microwave field, nuclear radiation, strict explosion-proof, waterproof, anti-corrosion, small spaces or small workpieces.

Application of point type fiber optic temperature sensor in high-voltage switchgear equipment

The fiber optic sensor is installed at the junction of the static contact and the busbar. Special fixtures with high insulation, high thermal conductivity, high elasticity, high temperature resistance, and corrosion resistance are selected for the fixation of the sensing head. The optical fibers are routed along the corners of the cabinet and the weak current cable trough, or tied together with insulation ties with the secondary wires inside the cabinet. This monitoring system has comprehensive monitoring and alarm functions, ensuring that high-voltage equipment is always in a monitored state and completely unaffected by human factors. When an alarm occurs, the system emits corresponding sound and light alarm signals, and the on duty personnel have sufficient time to take corresponding measures. This is particularly important for avoiding accidents or causing fires.

The application of point type fiber optic sensing technology in temperature monitoring of high-voltage switchgear in transmission systems has achieved real-time online temperature detection at key equipment points (contacts, cable joints). At the same time, special optical fibers with high voltage levels are used, as optical fibers have characteristics such as electrical insulation, intrinsic safety, and immunity to electromagnetic interference, meeting the requirements of high-voltage power switchgear equipment for the voltage resistance level of optical fibers.

The application of point type fiber optic temperature measurement system effectively improves the safety and reliability of power supply in the power grid, and has certain promotion value in the same industry as a measurement method.

The point type fiber optic online temperature measurement system for high-voltage switchgear uses online temperature monitoring to monitor the operating temperature of electrical equipment, especially the temperature at hot spots, which is an important means of fault warning and accident prevention. It can detect signs of heating at equipment joints inside the switchgear in advance and prevent fault events caused by temperature rise.



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