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Characteristics of Distributed Fiber Optic Temperature Measurement System in Power Plants

Why do power plants need temperature measurement

Usually, a power plant occupies a very large physical land area, including the main plant area, production and office area, and auxiliary plant area. These areas not only include generator sets but also various equipment, with a large number of types and quantities. The geographical distribution is wide, scattered and disorderly, leaving a great fire hazard. Once a fire occurs, the impact will be huge and it is difficult to bear such a cost. In response to this situation, the traditional approach is to form fire prevention zones for each area and establish independent fire alarm systems, which requires a large number of monitoring personnel. At the same time, daily inspection and maintenance work is very intensive and inefficient. In order to prevent the occurrence of fire in power plants, especially in the generator set area, and to more effectively monitor the hidden fire situation, it is necessary to cover the fire alarm system managed uniformly throughout the entire plant.

Distributed fiber optic temperature measurement is widely used in temperature monitoring and fire alarm of facilities such as power, petrochemicals, transportation, buildings, and water conservancy. The length of high-voltage transmission cables is very long, and any point on the cable that overheats may cause huge economic losses. Traditional linear temperature sensing cables cannot measure temperature and can only determine whether the temperature exceeds the preset value. They can only passively select the alarm temperature value based on the material of the insulation layer, and cannot be set according to the environment. When an alarm is triggered, a major disaster often occurs. After the alarm, the temperature sensing cable is damaged. In humid and corrosive environments, the insulation skin is easily damaged, and the longest service life is only a few years. Due to many factors such as aging of the insulation skin and electromagnetic interference, false alarms are easily generated, and due to its electrification, it is not effective. Suitable for special hazardous situations.

The DTS distributed fiber optic temperature measurement system uses the fiber optic itself as a temperature sensor to measure temperature. As long as one fiber optic is laid, it can continuously and simultaneously monitor the temperature distribution at the location of the fiber optic. Therefore, it can be applied to temperature measurement in building systems, power systems, smelting systems, chemical systems, etc.

Characteristics of Distributed Fiber Optic Temperature Measurement System in Power Plants

1. Continuous distributed measurement, distributed fiber optic sensors are truly distributed measurements that can continuously obtain measurement information along the temperature measuring optical cable for tens of kilometers, with a wide range.
2. Anti electromagnetic interference, can work normally in high electromagnetic environments, and the optical fiber itself is composed of quartz material with complete electrical insulation; At the same time, the signal of the fiber optic sensor is carried by the fiber optic, which is inherently safe and not affected by any external electromagnetic environment interference.
3. Intrinsic lightning protection, lightning often damages a large number of electrical measurement sensors. Fiber optic sensors, due to their complete electrical insulation, can withstand the impact of high voltage and high current.
4. The measurement distance is long and suitable for remote monitoring. The two outstanding advantages of optical fiber are large data transmission and low loss. It can achieve remote monitoring for tens of kilometers without the need for relays.
5. The combination of temperature measurement host and fire controller has advantages such as compact structure, low power consumption, high performance, and easy maintenance.
6. Distributed optical fibers have a long lifespan and low cost. This device is simple and easy to use. The material of the optical fiber has the characteristics of non corrosion, fire resistance, water resistance, and long lifespan, and can usually serve for 30 years.

FJINNO’s independently developed fiber optic sensor technology is advanced and has low maintenance costs. The use of fiber optic sensors can greatly reduce the final operating costs of the entire project.

The fire alarm information of the entire power plant is obtained through the fiber optic temperature measurement system and alarm control system distributed in various areas of the power plant. The upper computer collects the data uploaded by the fiber optic temperature measurement system and alarm control system through the main controller to monitor the fire situation of the entire power plant. The centralized management of the fire alarm of the entire plant is comprehensive and efficient, and does not require a large number of monitoring personnel, reducing daily inspection and maintenance work.

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