Fiber optic temperature sensor, Intelligent monitoring system, Distributed fiber optic manufacturer in China
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With the development of science and technology and market economy, intelligent control is becoming increasingly popular. The requirements for electricity capacity, power supply quality, and guarantee ability in residential life, enterprise production, public places, etc. are becoming higher and higher. The rated current of substation equipment and control equipment is also constantly increasing; Smart grid is a forward-looking trend, and the intelligence of power equipment is the foundation of smart grid. Substation equipment, control equipment, and electrical equipment are generally connected through the main busbar. The intelligence and standardization of temperature monitoring in the busbar power supply system are the basis for real-time transmission status, temperature conditions, and even patrol detection of power. In the practical application of busbar trunking, due to long-term operation in the air and the influence of ambient temperature and humidity, thermal expansion and contraction, surface scaling, oxidation or corrosion may occur, leading to loose contacts and poor contact. Especially in some large buildings (such as large factories, super high-rise buildings, etc.), where the installation position of busbar trunking cannot be manually monitored, users often neglect the safety management of busbar trunking. Once the temperature of the busbar joints during operation is abnormally overheated, it may lead to fire or major safety and quality accidents, bringing huge and irreparable personal injury and economic and property losses to enterprises.
The bus duct is in a fully enclosed state during operation and is generally in a long-term live state, making daily maintenance and inspection very inconvenient. Therefore, it is necessary to monitor the temperature of the bus joints inside the bus duct to improve the reliability of its operation.
During the operation of power equipment (such as power switchgear), it is often necessary to confirm the operating status of the equipment by measuring the temperature of various parts and components inside the power equipment. Contact temperature measurement is a commonly used method, but in the contact temperature measurement method, it is difficult to install the temperature measuring device on the busbar to ensure the reliable connection between the temperature sensor and the busbar, and to ensure the reliable measurement of temperature. For example, it is fixed with aviation specific adhesive, but the assembly efficiency is relatively low, and the contact stability and reliability are poor.
The busbar refers to the connecting conductors between the main switch in the distribution cabinet and each branch circuit in the power supply system. The busbar may experience temperature rise during operation due to various reasons, but the temperature of the busbar needs to be controlled within a certain range to ensure the normal operation of the power supply system and prevent accidents. Therefore, temperature monitoring of the busbar is necessary at all times.
With the continuous development of technology, various wireless bus temperature measurement devices have been used in the daily maintenance of busbars, which are basically powered by batteries, solar energy, external power supply, self induction power supply, etc. The device structure is complex.
With the emergence of high-rise buildings and large factories, the electricity consumption in various industries has grown rapidly, and traditional cables can no longer meet the requirements in the transmission of large currents. As a new type of distribution conductor, plug-in bus duct has emerged. Compared with traditional cables, it can fully demonstrate its advantages in high current transmission. However, the busbar trunking is exposed to high current and high voltage working environments for a long time. Due to aging, oxidation, loosening and other reasons, the contact resistance of the busbar contact points and each section of the connection will increase, leading to heating of the busbar, causing safety accidents such as leakage and melting, and even causing fires. Therefore, temperature monitoring of the busbar trunking is particularly important.
At present, there are several main solutions for temperature monitoring of bus ducts:
1. Infrared temperature measurement technology:
The measurement range is large and the accuracy is high, but with cable communication, cables need to be laid and temperature measurement space is required, making it impossible to achieve integrated integration of busbar equipment and online temperature detection. If there is a fault in the line, it will cause temperature measurement failure on a large area of the line.
2. Wireless temperature measurement technology:
Using wireless communication technology for signal transmission, due to distance limitations, it is necessary to set up adapter nodes (repeaters) at a certain distance to amplify the signal; Wireless signals are greatly affected by obstacles and are prone to attenuation; When wireless temperature measurement is used, the service life of the power supply battery needs to be considered, and a time-based circuit (i.e. supplying power to the system at intervals) is adopted. Although this method extends the service life of the battery, it cannot achieve the function of real-time data collection, which poses a safety hazard.
3. Distributed fiber optic temperature measurement
The distributed fiber optic temperature measurement system is applied to the busbars and busways of each circuit for real-time temperature monitoring, thereby achieving safety monitoring of the operation of the busbar equipment.
Distributed fiber optic temperature measurement system: It adopts optoelectronic technology, communication technology, microprocessor technology, digital temperature sensing technology, and designed low temperature, strong electric field, and humid environment operation technology. It can monitor the temperature in different environments separately, detect accident hazards early, and effectively reduce losses. At the same time, it can also provide a large amount of online monitoring data to provide operators with a comprehensive understanding of the outer temperature of the busbar, thereby indirectly inferring the current and load situation in the busbar, and providing power allocation basis for departments.
The significance of distributed fiber optic temperature measurement system:
1. Safely increasing the current carrying capacity of the circuit;
2. Can achieve periodic state monitoring;
3. Drive external alarms or other emergency systems;
4. Identify hotspots (especially bus joints with potential accident hazards) and other environmental anomalies.
The distributed fiber optic temperature measurement system is a highly intelligent and automated monitoring technology that does not require manual inspection of the monitored area. The monitoring room screen can display temperature information of various points in the entire monitoring area; When there is an overheating point, it can sound or light an alarm, and even send it to relevant personnel via mobile phone SMS. Can accurately predict hot spots before accidents occur, with high positioning accuracy, and display the evolution of hot spot temperature. At the same time, the temperature sensor in the distributed fiber optic temperature measurement system has the characteristics of explosion-proof, strong electromagnetic interference resistance, good electrical insulation, lightning protection, high precision, light weight, small volume, corrosion resistance, high temperature resistance, and no static electricity. It can simultaneously measure the temperature distribution information on the entire fiber optic.
