How to monitor temperature in bus duct and complete application of distributed fiber optic sensing in bus monitoring

Fiber optic temperature sensor, Intelligent monitoring system, Distributed fiber optic manufacturer in China

Monitoring method for temperature of bus duct
Bus ducts generate heat during operation, and if the heat dissipation is poor or the external temperature is too high, it may cause the temperature to rise too quickly, affecting the safety of power distribution. Therefore, establishing an effective temperature monitoring system is crucial. The following are several common methods for monitoring the temperature of bus ducts:

1. Manual handheld infrared thermometer
Advantages: Simple and easy to use, low cost.
Disadvantages: Low efficiency, poor accuracy, inability to achieve real-time monitoring, and potential safety hazards.

2. Distributed fiber optic temperature measurement system
advantage:
High temperature monitoring accuracy: using advanced backward Raman scattering principle and optical time domain reflection positioning principle, it can monitor the temperature changes along the bus duct in real time, with a measurement accuracy of up to 1 ℃.
Intrinsic safety and corrosion resistance: Optical fibers themselves have the characteristics of electrical insulation and resistance to electromagnetic interference, making them suitable for fire monitoring of power equipment. Fiber optic sensors are corrosion-resistant and have a long service life, which can meet the long-term stable operation needs of bus ducts.
Easy installation and maintenance: Fiber optic cables have good flexibility and flexible installation positions, which can meet different bus duct layouts and space requirements. The system structure is compact, easy to maintain, and reduces maintenance costs.
Diversified alarm methods and data query functions: Users can set warning and alarm values according to actual situations, display real-time temperature of each zone, and display historical data and change curves, making it convenient for users to timely understand and grasp the operating status of the bus duct. Data storage and analysis: Store temperature data of each node for easy viewing and later analysis.
24-hour uninterrupted online monitoring: Once the monitoring data exceeds the limit, an alarm (sound and light alarm) will be triggered, and a warning and alarm system will be implemented to detect accident symptoms in advance and prevent accidents from occurring. Realize the transformation from traditional manual operation and maintenance mode to intelligent operation and maintenance mode, and develop scientific inspection and maintenance plans.
Improving management efficiency: Temperature measurement data can be uploaded to a comprehensive backend and viewed in the central control room, avoiding daily manual inspections, saving labor costs, and increasing temperature measurement efficiency, thus avoiding the difficulties and dangers of manual inspections in hazardous areas.

3. Non contact infrared temperature measurement system
advantage:
Real time monitoring: The bus temperature is collected through a non-contact infrared temperature measurement module, and the data is uploaded to the server through a 4G data transmission module. Temperature monitoring and warning, equipment management, and other operations are performed on the visual interface in the client.
Remote monitoring and management: It can monitor the temperature of the plug-in boxes at various locations in the entire community and remotely monitor and manage them, with practicality and scalability.
Disadvantage: It is greatly affected by environmental factors and may require regular calibration.

The complete application of distributed fiber optic sensing in busbar monitoring
1. Installation steps
Fiber optic laying: Lay along the direction of the busbar circuit to ensure comprehensive temperature monitoring. At each busbar connection, temperature sensing optical fibers are wound into temperature measuring rings to more accurately monitor the temperature conditions of these critical areas.
Fixed method: The optical fiber should be firmly fixed on the upper surface of the busbar, as this layout can more effectively capture temperature changes. If there are restrictions on the installation location, the optical fiber can also be fixed on the lower surface of the busbar, but it is absolutely not allowed to fix the optical fiber on the outside of the side plate to avoid affecting the accuracy and stability of temperature measurement.
Terminal processing: Each distributed fiber optic temperature measurement host can connect multiple channels of temperature sensing fibers, and a fiber optic terminal box is installed at the end of each channel fiber optic. About 10 meters of fiber optic cable is reserved in the terminal box, and the fiber optic cable in the terminal box is not used for temperature measurement, mainly for positioning testing.

2. Principle of distributed fiber optic temperature measurement technology
Principle of backward Raman scattering: Distributed fiber optic hosts inject optical signal pulses into the fiber optic system, and during the transmission of the optical signal within the fiber optic system, backward Raman scattering occurs. When a certain position of the optical fiber is affected by external heat, the photon energy at that position will change, resulting in scattered light of different wavelengths, which are closely related to temperature.
Principle of Optical Time Domain Reflectance Localization: The distributed fiber optic temperature measurement host analyzes the wavelength and frequency shift of the returned signal, performs photoelectric conversion and signal amplification processing, calculates temperature data, and locates abnormal hotspots.

3. Configuration of distributed fiber optic temperature sensor monitoring system
Temperature sensing optical fiber: The optical fiber is inserted into the bus duct and fixed with high temperature resistant and fire-resistant zip ties. The optical fiber can be laid for a long distance. In the wider area inside the bus duct, S-winding is used to increase the contact area.
Monitoring host: The monitoring host is placed in the weak current cabinet, and one host can be connected to multiple optical fibers to meet the monitoring of multiple lines. The host comes with RS485 and Ethernet communication to collect and analyze data centrally, upload it to the software platform, and view the location of temperature anomalies on the monitoring map.
Temperature monitoring system: The temperature monitoring system is usually installed on a PC host, where the temperature data of the fiber optic cable laying line can be viewed. The sampling interval is 0.4 meters, and the positioning accuracy is 1 meter. With the help of the line map, abnormal data locations can be located.

4. Application advantages
High temperature monitoring accuracy: The measurement accuracy can reach within 1 ℃, ensuring the safe operation of the bus duct.
Intrinsic safety and corrosion resistance: Optical fibers themselves have the characteristics of electrical insulation and resistance to electromagnetic interference, making them suitable for fire monitoring of power equipment.
Easy installation and maintenance: Fiber optic cables have good flexibility, flexible installation positions, easy maintenance, and reduce maintenance costs.
Diversified alarm methods and data query functions: Users can set warning and alarm values according to actual situations, display real-time temperature of each zone, and display historical data and change curves.
In summary, the distributed fiber optic temperature measurement system has significant advantages in temperature monitoring of bus ducts, which can effectively improve the safety and stability of bus ducts, reduce maintenance costs, and is an indispensable part of the power system.