Distributed Fiber Optic Temperature Measurement System for Cable Tunnel

Characteristics of Distributed Fiber Optic Temperature Measurement System for Cable Tunnel

1. Immune electromagnetic interference:

Due to strong electromagnetic interference in environments such as subway tunnels, traditional temperature sensors based on electrical signals are often greatly limited in terms of safety and signal stability. The anti electromagnetic interference ability, convenient networking, and inherent large signal transmission bandwidth of optical fibers have enabled optical fiber temperature sensors to break through the limitations of electric temperature sensors, providing a very effective temperature measurement technology for environments with strong electromagnetic field interference such as subway tunnels.

2. Speediness:

The temperature measurement and positioning speed of the tunnel temperature sensing system is very high. In order to improve measurement time, Huaguang Tianrui adopts the advantage of high-speed weak signal processing technology, with a minimum single measurement time of 5 seconds and fast response speed.

3. Distribution characteristics:

The cable tunnel fiber optic temperature measurement system can provide continuous dynamic monitoring of temperature change signals at every 1 meter point within a range of more than ten kilometers, and can set temperature alarm values at any level.

4. Progressiveness:

The system is currently the most high-performance, functional, reliable, and technologically advanced distributed temperature measurement product in China. High performance devices are preferred for key components, and the core algorithm has undergone rigorous testing.

5. Accuracy

The temperature resolution of the system reaches 0.1 ℃, the temperature accuracy is 1 ℃, and the positioning accuracy can reach 1m.

6. Flexibility

The system adopts real-time online monitoring mode; The time for uploading the alarm signal from any point within the monitoring range to the fire alarm controller shall not exceed 60 seconds; The monitoring system provides a continuous dynamic monitoring signal, and can set multi-level temperature point alarms. The system supports multi-level alarms, such as initial alarm at 50 ℃, pre alarm at 60 ℃, and measures taken at 70 ℃. The temperature parameters of the alarm points can be set according to different environments; It has multiple alarm methods with differential temperature control, and the alarm parameters can be set in different zones according to customer needs, making the alarm methods flexible.

7. Compatibility

The host of the tunnel distributed fiber optic temperature measurement system is an open communication protocol that provides a communication interface to connect with the workstation. The disaster prevention alarm workstation in the central control room displays all information such as temperature curves, alarm positions, and alarm temperatures in a graphic and textual manner; The system can be linked with other control devices such as PCs and fire alarm systems through RS232, RS485, built-in relays, RJ45, or other industrial protocols for sound and light alarms, with accurate and complete signal output.

8. Security

The distributed temperature monitoring system has a safety record function, which can store historical data within one year and conduct effective audits. Single end operation, remote diagnosis, can be provided with minimal system remote diagnosis through a local area network by specialized engineers; If the optical fiber is damaged, the system can immediately locate the damaged point and fuse it through the fiber fusion splicer without stopping the measurement, which is very important for effective online monitoring; Detecting the intrinsic safety of optical cables, using optical signals, will not cause mutual electromagnetic interference with the cables.

9. Easy to install

The installation of the distributed fiber optic temperature measurement system is simple, and the optical cable can be directly laid on the surface of the tested cable, with a focus on monitoring the cable joints. The software system can intuitively display the temperature change information and location of the measured point.

Solution for Distributed Fiber Optic Temperature Measurement System in Cable Tunnel

The distributed optical fiber temperature measurement system independently developed by Huaguang Tianrui monitors the temperature of long-distance subway systems in real time through temperature measuring optical fibers laid along cables and subway tunnels, timely detecting hotspots and abnormal points in cables and tunnels, ensuring the safe operation of power cables, and providing efficient and accurate monitoring solutions for fire warning of subway systems. Safely increase the current carrying capacity of the circuit; Can achieve periodic emergency state assessment; Drive external alarm or other emergency systems; Identify hotspots (especially cable joints with potential accident hazards) and other environmental anomalies. A distributed fiber optic temperature measurement system with 8 channels (quantity can be customized) and 10 kilometers (distance can be customized) can be designed according to the needs of the owner, which is applied to real-time online temperature measurement of 110KV two circuit high-voltage cables in the owner's cable tunnel and temperature measurement of the environment at the top of the tunnel. The temperature measuring optical cable is bundled and laid in a straight line, with a focus on monitoring the real-time temperature of a cable joint at a specific distance of meters according to demand. A SMS alarm module can be installed according to customer requirements to provide early warning. It can achieve monitoring of the entire area, designed as "unmanned", and upload alarm information to the comprehensive monitoring system in real time. So far, the fiber optic temperature measurement system has been running well and its technical indicators fully meet the design requirements.

Product model and parameter indicators of distributed fiber optic temperature measurement system for cable tunnels:

The following parameters are displayed as standard parameters and can be customized according to specific customer needs, making it easier to respond promptly to inquiries by phone: