The importance of fiber optic grating temperature measurement systems in the power industry

Sensor de temperatura de fibra óptica, Sistema de monitoramento inteligente, Fabricante de fibra óptica distribuída na China

Most equipment in the power industry is located in strong electromagnetic fields, and general electrical sensors cannot be used. The online monitoring of high-voltage switches, as well as real-time detection of temperature and displacement parameters in high-voltage transformer windings, generator stator, etc., all require good insulation performance and small volume. The anti electromagnetic interference and safety performance of fiber optic gratings can precisely meet the requirements for use under such environmental conditions. In a strong electromagnetic environment, the safe operation of key basic electrical equipment is a necessary guarantee for enterprise production and also a basic guarantee for the normal operation of the entire national economy. The majority of faults in electrical equipment are caused by overheating, which can be mainly divided into external thermal faults and internal thermal faults.
External thermal faults of electrical equipment mainly refer to exposed joints that, due to poor crimping and other reasons, experience an increase in temperature under high current, oxidation of the contact points, leading to an increase in contact resistance and a vicious cycle causing hidden dangers. This type of fault accounts for over 90% of external thermal faults. By collecting thousands of data on external thermal faults detected in recent years, it can be found that thermal faults of wire clamps and knife switch contacts account for 77% of the total external thermal faults, with an average temperature rise of about 30C. The average temperature rise of other external joints is between 20C-25C.
The fiber optic grating online temperature monitoring system has the advantages of high insulation, unaffected by electromagnetic environment, suitable for long-distance, high-quality signal transmission, and high measurement accuracy. It is particularly suitable for use in high voltage and strong magnetic field environments such as electricity. Portanto, it fundamentally solves the defects of traditional temperature measurement equipment and provides reliable technical support for the safe operation of power equipment.

Composição de Fiber Bragg Grating Temperature Monitoring System

The fiber optic grating sensing system mainly consists of fiber optic grating sensors, optical fibers used for signal transmission, and fiber optic grating demodulation equipment. Fiber optic grating sensors are mainly used to obtain values of physical quantities such as temperature, coar, pressão, displacement, etc. Fiber optic grating demodulation equipment is used to detect and process sensor signals to obtain measurement results, and remote sensing can be achieved through fiber optics.
System characteristics
High safety: The signal processing and control unit of the entire system is located in a control room far away from the working area, and the temperature signal collection by sensors is carried out in a non electric (non electric) condition, which is inherently safer;
High accuracy: using fiber optic grating temperature sensors, with a typical accuracy of 1C;

Large capacity: The temperature measurement system can connect up to 32 sensors, each of which can connect 12 measurement points in series. A single device can complete up to 384 temperature measurement points;
Convenient positioning: Through software association technology, it is possible to quickly locate the area or specific physical location of the measurement point;
Real time online measurement: The light source used in the system has a long service life (over 20 Anos) and can meet the needs of real-time online and all-weather monitoring;
Quick response: The system response time should not exceed 60 seconds to ensure timely handling of accidents:

Simple and intuitive: The temperature of each measured point can be directly seen on the display screen of the temperature measurement system. After setting the temperature alarm threshold, the system automatically provides sound and light alarms:
Convenient deployment: The placement of sensors can be flexibly adjusted according to engineering needs;
Good compatibility: Through various communication interfaces (serial port, network port, etc.), it can achieve communication with external systems
Good integration to improve data exchange speed between systems;
Longa vida útil: can operate safely for over 20 years under normal working conditions.
High degree of automation: data can be directly input into systems such as DCS, ECS, SIS, MIS, etc

System software functions
Display function: The display function of the three-dimensional process screen; Has multiple types of charts, system diagrams
Curve chart, more intuitive user interface;
Analysis function: Display historical trends, evaluate future trends, and provide maintenance reference information; Alarm function: Set fixed temperature and differential temperature warning values, fire alarm values, alarm levels, and geographical location names for different locations based on actual conditions; The system can set sound alarm function;
Printing function: It can print various reports;
Upload function: Real time temperature data can be uploaded online, making it easy to achieve unmanned operation:
Self check function: If a sensor in the system malfunctions, the faulty sensor can be identified through software;
Table Customization: Users can customize various tables, including real-time data tables, historical data and statistical reports, equipment parameter tables, alarm lists, commonly used data tables, catalog tables, memos, etc
Query function: You can directly query device information, operating parameters, statistical information, etc. on the system diagram.