Distributed fiber optic cable temperature monitoring system

system function

1. Temperature monitoring of cables and cable joints: Real time temperature monitoring and abnormal alarm of high-voltage cables and joints are carried out through a distributed fiber optic temperature measurement system;

2. Dynamic current carrying capacity: By using a dynamic current carrying capacity mathematical model to calculate the core temperature of the cable, further calculate the dynamic current carrying capacity and simulate various operating states;

3. Temperature monitoring of cable interlayers, switchgear, etc.: Temperature monitoring and fire warning of key areas such as cable interlayers, switchgear, etc. are carried out through distributed fiber optic temperature measurement systems and fluorescent point temperature measurement systems;

4. Monitoring of protective layer grounding cables: By using high-precision current transformers to monitor the leakage current of the grounding wire, effective monitoring and abnormal alarm of protective layer grounding current can be achieved;

5. Partial discharge monitoring: By installing high-frequency current sensors on the grounding wire of cable joints, partial discharge information is obtained and insulation defects of cables and joints are analyzed, providing judgment for evaluating other insulation levels and aging degrees.

Distributed DTS fiber optic temperature sensing for comprehensive monitoring of cable tunnels

The construction of a comprehensive monitoring system for cable tunnels can effectively reduce the workload and safety risks of inspection personnel, arrange state maintenance reasonably, greatly reduce the accident rate of transmission cables, avoid adverse social impacts, reduce the loss of electricity sales, and effectively reduce the probability of tunnel ancillary facilities being stolen, avoiding the waste of funds due to the restoration of stolen facilities every year.

The causes of cable tunnel fires:

The production process quality of the cable intermediate joint is not up to standard, and the joint connection is loose

Cable bending or artificial damage

The contact resistance of the cable increases, leading to long-term operation causing temperature rise, joint cracking, and insulation layer breakdown

The temperature measurement host monitors the temperature information of the cables in the tunnel in real time through detection optical cables laid on the surface of the cables, detects hotspots in a timely manner, accurately locates them, and gives timely warnings.

At the joint, the detection optical cable is fixed to the cable terminal and cable joint using a double ring winding method, ensuring close contact between the temperature measurement optical cable and the cable terminal or cable joint.

The distributed fiber optic online temperature monitoring system (DTS) comes with a backend service system, which collects temperature information wherever the fiber optic cable goes, automatically completes data collection and storage. Users only need to remotely control the operating system through the network on the client PC, and the monitoring station can be completely unmanned; The system has a SMS sending function. When an abnormal line is detected, the system will automatically notify the administrator of the specific location and temperature of the abnormal point through SMS, so as to handle it in a timely manner and eliminate the hidden danger of cable overheating accidents.

Technical indicators:

Measurement distance: 2km, 4km, 8km, 12km, 20km, 30km, 40km

Number of channels: 1, 2, 4, 8, 16

Response time: ≤ 10 seconds/channel

Temperature measurement accuracy: ≤ ± 0.5 ℃

Temperature measurement range: -100 ℃ to+700 ℃ (determined by the detection optical cable)

Positioning accuracy: ≤ 1 meter

Working temperature: -10 ℃~60 ℃

Working humidity:<95% RH (no condensation)

Interface method: Relay output, RS232/485, Ethernet port

Application field:

Building system

Temperature distribution monitoring and fire alarm for various high-rise buildings, buildings, large conference halls, and auditoriums

Temperature measurement and abnormal alarm of concrete structures in reservoirs, embankments, bridges, and highways

Power system

Monitoring and control of surface temperature of power cables, locating accident points, and fire prevention in cable tunnels

Temperature distribution measurement, thermal protection, and fault diagnosis of various large and medium-sized generators, transformers, and motors

Temperature monitoring and fault point detection of heating systems, steam pipelines, and oil pipelines in thermal power plants

Temperature monitoring of equipment in underground substations and indoor enclosed substations

Smelting system

Temperature monitoring and fault detection of various high-temperature heating furnaces and constant temperature tanks

Temperature monitoring and fire warning of coal mine tunnels

Chemical system

Temperature monitoring and fault point detection of various flammable material warehouses, oil depots, and oil pipelines

Temperature monitoring and fault point detection of various chemical raw materials and automatic heating production lines