With the development of new technologies in the power system, the 35kV substation in the mining industry is keeping up with the forefront of technology and has increasingly high requirements for the safe operating environment of the substation. This requires ensuring that the switchgear must have a safe operating environment. Long term operation of the substation switchgear can cause electrical accidents due to hot contacts inside the switchgear and aging of the cable parts, making it difficult to achieve random monitoring of the contact temperature inside the switchgear. Conventional infrared temperature measurement instruments cannot achieve this. Therefore, it is necessary to introduce a fiber optic online temperature measurement device system to achieve real-time monitoring of the switchgear temperature and ensure its normal operation.
1) Infrared temperature measurement method
Infrared temperature measurement method is a non-contact temperature measurement method, which is currently widely used in 35kV substations in coal mines. However, it is not suitable for monitoring hot spots inside enclosed switchgear.
2) Wireless temperature measurement
It is a wireless intelligent sensor module installed at the contact position of the switchgear for temperature collection, which belongs to non-contact temperature measurement. Its inherent insulation and anti electromagnetic interference performance fundamentally solve the problem of difficult monitoring of contact temperature inside the high-voltage switchgear. However, if the power supply of the wireless sensing module uses batteries, there are safety hazards to the operation of the switchgear, such as short battery life and self explosion, and it is not suitable for temperature measurement in the switchgear;
3) Fluorescent fiber optic online temperature measurement
The fluorescence fiber optic temperature measurement system is composed of a fiber optic temperature transmitter and a fluorescence fiber optic temperature sensing probe. Through the fiber optic and signal receiving adjustment device, the temperature measurement is completed by transmitting optical signals, achieving temperature measurement of the contacts inside the switchgear and ensuring the safe operation of the switchgear.
Introduction to Fluorescent Fiber Temperature Measurement System
The temperature signal collected by the fluorescent fiber optic sensor is transmitted to the fiber optic transmitter through the fiber optic. The fiber optic temperature measurement system software demodulates and analyzes the final result, which is displayed through backend monitoring. When the temperature of the switchgear exceeds the limit, the alarm will upload detailed information of the alarm to the upper computer.
The functions and characteristics of fluorescence fiber optic temperature measurement system
The Function of Fluorescent Fiber Temperature Measurement System
1) Fiber optic temperature sensors are arranged at the static contacts, knife switches, feeder joints, and other positions of the high-voltage switchgear to collect temperature signals;
2) Transmission fiber optic: transmit the temperature sensor signal to the fluorescent fiber optic thermometer;
3) Fluorescent fiber optic temperature measurement system: collects and analyzes temperature signals, providing real-time information on on-site temperature of switchgear;
4) Alarm: The fluorescent fiber optic temperature measurement device will provide monitoring and alarm information to the staff in a preset alarm form in a timely manner;
5) System software: Adopting professional and independently developed fiber optic temperature measurement software, providing software support for the operation of the entire system and achieving remote monitoring of temperature changes.
The characteristics of fluorescence fiber optic temperature measurement system
1) The fiber optic temperature measurement system is an all fiber type, which does not require power supply on site and will not cause accidents such as battery explosions. It can be used in explosion-proof situations;
2) Sensors and transmission optical fibers are insulated, high-voltage resistant, anti creep, flame retardant, and do not lower the safety protection level of the switchgear;
3) Not affected by electromagnetic interference, line loss does not affect temperature measurement, and accuracy does not require on-site calibration,
4) The equipment can operate for more than 10 years without being damaged by external forces, meeting the safety and reliability requirements of electrical equipment;
5) Fast response speed, accurate positioning, and large capacity scalability, which can be expanded into multi-channel online monitoring;
6) Remote transmission, fiber optic transmission with a distance of over 10 meters, easy networking, and other characteristics;
7) The construction requires laying fluorescent optical fibers and installing fiber optic sensing probes;
Software functions of fluorescent fiber optic online temperature measurement system for switchgear
1) Display function: The temperature distribution of 35kV and 6kV switchgear is intuitive and clear, with various types of charts, system diagrams, historical curve graphs, etc;
2) Analysis function: Historical trend display evaluates future trends and provides reference information for maintenance switches;
3) Alarm function: Set warning values and levels for different locations according to actual conditions, and configure functions such as sound and light alarm, mobile phone SMS alarm, etc;
4) Printing function: It can print various reports;
5) Upload function: Fiber optic transmission of temperature signals, real-time data of switchgear can be set to network upload for remote monitoring;
6) Self check function: Once a sensor in the system malfunctions, it can be identified by software to facilitate the on duty personnel to promptly diagnose and handle the fault,
7) Table customization: Users can customize various tables, including real-time data tables, historical data and statistical reports, alarm lists, etc. The data storage cycle can be set according to specific situations;
8) Query and save data function: It can directly query various information and historical data on the system diagram, and automatically save the temperature data of each switchgear;
9) System security: Different usage permissions are set according to different positions to backup the system, providing convenience for system maintenance and ensuring the safe operation of the temperature measurement system.