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Advantages of Distributed Sensor Technology in Cable Temperature Online Fiber Optic Monitoring System

FJINNO offers fluorescence fiber optic temperature measurement systems, distributed fiber optic temperature measurement systems with leading technology, and fiber Bragg grating temperature sensors at reasonable prices. Welcome to contact us.

Why does the cable temperature rise and the necessity of an online real-time temperature monitoring system for cables

The application of power cables in urban power grid systems is increasing. During the operation of power cables, the conductor, insulation layer, and metal shielding layer will be damaged, causing the cable to heat up and increasing the working temperature of each part. Excessive temperature can affect the insulation performance of the insulation material, cause insulation aging, shorten the service life of the cable, and in serious cases, lead to fire and power outage accidents; The temperature value of the conductor is also an important characteristic value for determining the current carrying capacity of the cable, so it is necessary to monitor the temperature distribution of each layer of the cable in real time during cable operation. Whether used for signal transmission or power transmission, cables are widely used, and the safe use of cables is particularly important. During long-term use, cables are prone to heat accumulation, causing safety hazards. Installing distributed fiber optic temperature measurement technology in cables can achieve full monitoring of cable temperature, thereby ensuring the safe use of cables. At present, due to the large length distribution of power cable lines, which usually run for several kilometers or even tens of kilometers, temperature is generated on the cable conductor when the load current passes through the cable. The temperature is transmitted layer by layer to other structural layers of the cable, up to the outer sheath layer.

In the era of the power industry, with the development of smart cities, new requirements have been put forward for the operation and maintenance of smart grids. At present, the direct reasons for the high temperature of cable joints are long operation time of the joints, loose compression joints, and excessive contact resistance. The long-term operation of the joint can cause overheating, burning through the insulation layer, and other phenomena, which can easily lead to fire accidents and economic losses. The transmission capacity of cables is mainly limited by the conductor material and its insulation thermal stability level. To ensure the safe operation of cables, it is necessary to monitor the temperature of the cable conductors in real time.

Cable distributed fiber optic sensor temperature monitoring system

Fuzhou Huaguang Tianrui Optoelectronics Enterprise provides a cable temperature monitoring device that ensures reliability, high cost-effectiveness, and low power consumption in order to improve the stability of the power system operation and meet the requirements of smart cities for smart grids. The technology for monitoring cable temperature mainly includes thermocouple temperature measurement method, fiber optic grating temperature measurement method, distributed fiber optic temperature monitoring technology, etc. Among them, thermocouple method is widely used, but this method generally only monitors the local temperature of the cable, and this method also has certain shortcomings in accuracy and stability; The fiber optic grating temperature monitoring method uses fiber optic grating sensors embedded in the cable body to monitor the cable temperature. This method improves stability to a certain extent, but can only achieve quasi distributed measurement of cable temperature, and the number of fiber optic grating sensors will increase investment costs; Distributed fiber optic sensing technology has the ability to resist electromagnetic interference and continuously measure the temperature of each point along the cable. It has also been applied in cable temperature measurement engineering to a certain extent. The technology of distributed fiber optic temperature measurement system based on Raman scattering has become very mature and has been used for real-time temperature monitoring of cables.

Advantages of Distributed Fiber Optic Temperature Measurement System Products

1. Real time performance: The distributed fiber optic temperature measurement system continuously monitors the temperature of the cable test area in real-time for 7 × 24 hours, timely detects and locates temperature anomalies, and achieves early warning;

2. Distributed: A distributed temperature measurement system that provides continuous dynamic monitoring signals and can measure real-time temperature changes at various points every 1 meter of the monitored object;

3. Progressiveness: The optical fiber itself not only transmits signals, but also is used for temperature detection, that is, communication and sensing are integrated, and the system can adapt to various harsh environments;

4. Accuracy: The temperature measurement accuracy of the system is high, with a positioning accuracy of 1M;

5. Flexibility: The temperature measurement function is set by the application software on the temperature measurement system host, which can set multi-level temperature alarms and be customized according to user requirements;

6. Scalability: The system can measure multiple optical fibers simultaneously, and multiple devices can be selected according to the actual needs of customers, allowing complex temperature measurement environments to be used as well;

7. Compatibility: The system supports Ethernet port and RS232 interface, providing partition, temperature, and alarm information to the end user control system;

8. Long service life: Armored temperature sensing cables can have a service life of up to 25 years without being damaged by external forces;

9. Easy to use: The system provides a visual interface, which is simple and concise, and can be easily mastered through simple training;

10. Intrinsic safety: The fiber optic temperature measurement system has the characteristics of intrinsic safety, explosion-proof, anti strong electromagnetic interference, and lightning protection;

11. The system has a wide range of applications: power plants, transmission and distribution grids, high-rise buildings, large shopping malls, warehouses, teaching buildings, residential areas, subways and other public places;

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