Como usar a tecnologia de medição de fibra óptica distribuída para medição de temperatura de fios e cabos de 220 V-INNO

Com o rápido desenvolvimento da rede elétrica e a aceleração da renovação da rede urbana, a proporção de cabos na rede elétrica aumentou significativamente, e a frequência de acidentes com incêndio em cabos também aumentou. O método tradicional de prevenção de incêndio em cabos é instalar caixas de prevenção de incêndio nas partes expostas do cabo, mas esses métodos são muito passivos e o efeito não é significativo. É impossível compreender atempadamente a temperatura do cabo, nem pode prevenir eficazmente acidentes de incêndio. Portanto, a fim de prevenir eficazmente acidentes com incêndio em cabos, é necessário projetar um sistema inteligente de medição de temperatura em fibra óptica para monitorar a temperatura dos cabos em tempo real. Fibra óptica distribuída temperature measurement technology is a good cable temperature measurement technology with broad application prospects in China.

detecção de temperatura distribuída
Principle of Distributed Fiber Optic Temperature Measurement Technology
Distributed fiber optic temperature measurement technology is a real-time, on-line, and multi-point fiber optic temperature measurement technology. It can monitor the spatial temperature field in real time. It is a new type of intelligent cable temperature monitoring technology widely used in industrial process control. Distributed fiber optic temperature measurement technology can achieve continuous real-time measurement of measurement points along the fiber optic cable in cable temperature measurement. Real time measurement of cable temperature can be achieved within a range of 1-30 quilômetros. The spatial positioning accuracy is less than 0.5 metros, with a temperature resolution of up to 0.5 graus Celsius, which can achieve real-time continuous measurement of cable temperature. Continuous and automatic measurement provides better results in a wide range of multi-point measurement applications. The distributed fiber optic temperature measurement technology mainly applies the principle of optical time-domain reflection and the influence of fiber Raman scattering temperature. Tecnologia distribuída de medição de temperatura por fibra óptica, as a new type of intelligent temperature measurement technology, has many advantages and characteristics. Distributed fiber optic temperature measurement technology can achieve large-scale, multiponto, e medição de temperatura de alta precisão, and can achieve automatic measurement, providing reliable technical support for online detection of cable insulation.
Application of Distributed Fiber Optic Temperature Measurement Technology
Taking the environmental monitoring system of 220KV Line 1 and Line 2 tunnels in college student cities as an example. The system environment is a mixture of overhead lines and cable lines for 220KV lines 1 e 2, with the cable section located in the middle of the entire line. The length of the cable is 1.7 quilômetros. The entire monitoring system is controlled by a computer, programmable logic controller (CLP), e distributed fiber optic cable temperature measurement system. The temperature of the cable, water in the tunnel, combustible gases, and other cable environments. Through computer software and PLC for monitoring, real-time remote monitoring, analysis of potential hazards in cable tunnels, and remote alarm information. The system mainly includes computers, comunicação de fibra óptica, sensores, etc., and is composed of a host, multiple switches, etc..

Layout of Distributed Fiber Optic Temperature Measurement System
The length of the entire cable temperature measurement cable is 4.2 quilômetros. The two cores of the cable are used as communication channels, with temperature information connected to the local area network of the power supply company and corresponding equipment configured.

Implementation of Distributed Fiber Optic Temperature Measurement System
Using a programmable controller (CLP) com 485 bus to connect the upper computer and sensors of the temperature measurement system. Each measurement unit, upper computer, and temperature measurement control layer are connected to form a complete network system, achieving centralized measurement and alarm information display, and achieving centralized management and control effects.
Distributed fiber optic temperature measurement technology can achieve automatic, contínuo, and real-time monitoring, timely grasp the temperature changes of cables in the control area, and timely alert various hazardous information. The host is placed in the indoor workstation. The temperature sensing cable is connected to the host and laid along the cable. Set up a monitoring point every 0.5 meters for continuous monitoring, fully understand the working condition of the cables, and timely transmit the cable information of the monitoring point to the monitoring control station to display the monitoring information. Such as monthly alarm data, accident alarm data, abnormal cable temperature, average cable temperature data, etc.. Temperature sensors have excellent characteristics such as thermal conductivity and mechanization. They can not only transmit temperature signals, but also transmit signal channels. They can receive signals from optical fibers at different positions on the cable, receive temperature information, and monitor cable temperature in various complex environments.
The optical channel switching multiplexer is a device that controls the optical path, plays a role in switching the optical path, is not affected by external wavelengths, and has high measurement accuracy. It can be connected to a temperature measurement host and perform function switching. Select the start channel and end channel, and switch freely through optical switches. The main interface can display real-time monitoring of temperature changes for the current cable.
When the cable temperature in the temperature measurement system is abnormal, first record the abnormal temperature data and specific location information, analyze and classify the abnormal data, and promptly issue an alarm message. Em segundo lugar, alarm information such as sound and light is transmitted through relays, and the alarm information is transmitted to the established address through Ethernet. Alarm information is transmitted to the industrial control station in a timely manner through the COM port. In the process of processing alarm information, cable temperature measurement data can be analyzed.

detecção de temperatura distribuída

O sistema distribuído de medição de temperatura de fibra óptica pode obter informações e alterações oportunas sobre a temperatura do cabo em qualquer ambiente complexo. O sistema de medição de temperatura pode definir um ou mais pontos de monitoramento e pontos de temperatura de alarme. If the cable temperature in the environment is abnormal, and the cable temperature changes abnormally, se a temperatura do cabo atingir ou exceder a temperatura definida, the temperature curve of the cable will be displayed in the system of the workstation. Mostrar: The temperature measurement system sends alarm messages to the PLC at any time. Depois de receber instruções de vários pontos de monitoramento, the internal program can control the environment of the cable based on the set temperature data. Pode abrir o sistema de escape, feche automaticamente as portas corta-fogo, prevent fire from spreading, and ensure that the entire system is in a safe control and control environment.

The distributed optical cable temperature monitoring technology is supported by advanced DTS technology. The cable is laid along the cable. It can achieve continuous monitoring of various temperature information along the cable, and real-time grasp of the dynamic information and temperature changes of the cable. Configuring cables is very valuable. Distributed fiber optic cable temperature monitoring technology can also achieve real-time online monitoring of cable temperature changes, and can set warning information for multiple monitoring points to prevent dangerous accidents from occurring. Com base na temperatura do cabo, a variação de carga do cabo pode ser determinada, a carga do cabo pode ser otimizada, a capacidade do cabo pode ser efetivamente aumentada, e a eficiência de utilização do cabo pode ser melhorada. A tecnologia distribuída de monitoramento de temperatura do cabo óptico melhorou as deficiências da tecnologia tradicional por meio da tecnologia de controle inteligente, melhorou o nível operacional de cabos na China, e reduziu a incidência de acidentes com cabos.