The Best Way for Fiber Optic Temperature Measurement
There are many types of fiber optic temperature measurement, including point type fiber optic temperature measurement and distributed fiber optic temperature measurement. In many special temperature measurement environments, temperature measurement may encounter some difficulties. Fluorescent fiber optic sensors are increasingly being valued due to their excellent insulation, anti electromagnetic interference, small size, low transmission loss, corrosion resistance, and easy installation. The basic principle of fluorescence fiber optic temperature measurement is to excite fluorescence medium with blue purple light to generate fluorescence, and the lifetime of fluorescence will decrease with the increase of temperature. Therefore, temperature measurement can be achieved by detecting the lifetime of fluorescence.
Comparison between traditional temperature sensors and fiber optic sensors
Traditional sensors are devices that isolate the measured physical quantity of input and convert it into electrical signals in a certain proportion. Its output can directly match the input of remote control devices, recording instruments, and other equipment in the system, forming a data acquisition and monitoring system. It is an important component to ensure the safe, economical, and stable operation of power equipment such as transformers, frequency converter units, and high-voltage switchgear. In practical applications, the above on-site environment is often extremely harsh, and operators often cannot reach the site and must collect these analog signals from a distance of several hundred meters or even several kilometers. In addition to various interferences in industrial sites (such as celestial discharge interference, corona discharge interference, electrical equipment frequency interference, induction interference) that enter the measurement system through different coupling methods, the signal is severely distorted. Due to the common mode voltage of several thousand volts to tens of thousands of volts between the on-site measurement circuit ground wire and the back-end collection circuit ground wire, if connected directly with cables, it will generate a large grounding loop current, posing a great threat to the safety of equipment and operators. Therefore, high-precision measurements must be completed in a state of mutual isolation. In this context, fiber optic sensors were born, which use optical fibers to isolate the voltage of tens of millions of volts between the acquisition end and the device and transmit data signals between them. Fiber optic has excellent electrical insulation characteristics and good resistance to electromagnetic interference, making it widely used in hazardous electrical environments.
What is the best temperature measuring device in the power system
At present, the fiber optic temperature measurement methods used for cable joints and high-voltage switchgear switch contacts mainly include distributed fiber optic temperature sensors, quasi distributed fiber optic grating temperature sensors, and plastic fiber optic fluorescence temperature sensors. The first two are relatively expensive to use, especially for small or scattered temperature measurement points, which require a lot of capital investment and cause many unnecessary waste. At the same time, there are also many inconveniences in the construction process. Although plastic fiber optic fluorescent temperature sensors have low cost and convenient construction, their high temperature resistance is poor, and their applications are greatly limited.
In the power system of power plants and large petroleum and petrochemical enterprises, it is necessary to measure the temperature of high-voltage cable joints and monitor the contact temperature of switchgear online. Fiber optic temperature sensors are the best means to meet their online real-time monitoring needs. The highly stable fluorescent fiber optic temperature sensor independently developed by FJINNO has been widely used in electrical equipment, which can meet the current safety production management needs of large enterprises in China and promote the popularization and application of low-cost and cost-effective temperature monitoring systems in electrical companies and manufacturers.
The advantages of point type fiber optic temperature sensors
It has the advantages of intrinsic safety, no electromagnetic interference, remote monitoring, high accuracy and sensitivity, high pressure resistance, corrosion resistance, ability to work in harsh chemical environments, and low cost.
The application scope of point type fiber optic temperature measurement method
Mainly used for online temperature monitoring and temperature alarm systems in high voltage and ultra-high voltage environments, its temperature measurement range includes but is not limited to: online temperature detection and overheating alarm systems for high-voltage transformer cabinets, switchgear, underground cables, and high-voltage overhead cables; Temperature detection and overheat alarm systems for various pipeline networks in power plants, as well as overall temperature detection and overheat alarm systems for large and medium-sized transformers; Environmental temperature detection and fire alarm system for substations; Temperature detection, fault diagnosis, and overheating alarm system for generator sets; Fire prevention and temperature alarm in coal mines and tunnels.
With the rapid development of China’s economy and the continuous upgrading of the power system, the market for point type fiber optic temperature sensors is growing at an exponential rate every year. With the gradual opening of the power market to private enterprises, its domestic market share will grow at a faster rate. We welcome cooperation in fiber optic temperature measurement products from various industries.