Why use a distributed fiber optic temperature measurement system
Cables have strict product standards and requirements, but they are widely distributed. Once the temperature of the cable is locally too high, it can cause a fire, which is extremely harmful. Therefore, temperature sensors need to be used to measure the temperature of the cable in operation. Various contacts, busbars, cable joints, and electrical equipment connectors inside the equipment are prone to poor contact and abnormal plug-in eccentricity. This will lead to excessive contact resistance, causing severe heating at this point under high current. The result is abnormal joint temperature, exacerbating contact surface oxidation, further increasing contact resistance, forming a vicious cycle. After a certain stage of development, it will cause serious faults and damage the safety and reliability of power supply. This is the main form of fault in high-voltage switchgear. Therefore, real-time temperature monitoring of the contact points, timely detection of hot spots inside the switchgear, and early prediction and alarm of faults are extremely important for ensuring the safety of life and property.
The role of distributed fiber optic temperature measurement system
The distributed fiber optic temperature measurement system, by setting up temperature sensing optical cables, can continuously measure the temperature of key areas 24 hours a day, accurately detect temperature without blind spots, and achieve accurate positioning of temperature anomalies, accurately and timely detect hidden dangers, providing effective data support for fire prevention measures, and solving various problems raised in use.
The composition of a distributed fiber optic temperature measurement system
This includes a distributed fiber optic temperature measurement device, ground workstation, and temperature sensing optical cable. The distributed fiber optic temperature measurement device adopts a distributed temperature measurement host setting. The distributed temperature measurement host includes an optical signal generation module, a backscatter signal module, a spectral analysis module, an optoelectronic replacement module, a signal amplification module, a signal acquisition module, a signal processing module, an information display module, an audio-visual alarm module, and a multi-channel interface module. The distributed temperature measurement host is located inside the substation, and the temperature sensing optical cable is laid in an L-shape. The workstation is equipped with a monitoring server.
The distributed fiber optic temperature measurement system can perform real-time, continuous, and large-scale temperature monitoring on key fire prone areas such as cables and substations, achieving the purpose of fire prediction and early warning, and effectively preventing the occurrence of fires.
The functions of a distributed fiber optic temperature measurement system
1. Collection function: Real time, continuous, and large-scale environmental temperature monitoring;
2. Analysis function: It has the function of accurately detecting the trend of temperature changes in the on-site environment, the temperature of key points of mechanical and electrical equipment, and achieving fire warning in key locations;
3. Alarm linkage function: It can send alarm signals and output relevant linkage signals based on the pre-set alarm value of the temperature in the alarm area;
4. On site display function: The temperature measurement host is equipped with a LCD display screen, and real-time temperature and other parameters of each measuring point can be queried underground;
5. Historical data storage and query function: equipped with measurement point historical data, abnormal alarm record storage and query function;
6. Fault diagnosis function: When the temperature sensing optical cable breaks due to external pressure, the system can automatically detect the position of the break point;
7. Networking function: Equipped with network interfaces and standard protocols, it is easy to connect to the mine automation platform and other subsystems.
Characteristics of Distributed Fiber Optic Temperature Measurement System
1. Wide monitoring range: Temperature sensing optical cables are both signal transmission channels and sensors. Temperature values at every point along the cable can be monitored by the temperature sensing optical cable, with real-time, continuous, and wide range temperature monitoring;
2. Rich alarm functions: The alarm zones can be set arbitrarily according to changes in on-site conditions, and each zone can set different alarm values; Maximum value and temperature rise rate alarm modes can be set, and multi-level warning can be set to achieve early warning before a fire occurs;
3. Intrinsic safety: Using temperature sensing optical cables as sensors, no power supply required, intrinsic safety;
4. Friendly human-machine interface: The temperature values of each measuring point can be queried on site.