Application of wireless temperature measurement system in Jihua Qifeng power plant

Abstract: in order to improve the safety of equipment, reflect the operation status of equipment and reduce the accident rate of equipment It is necessary to monitor the temperature of the electrical connection points in the high and low voltage distribution cabinet, such as busbar lap joint, circuit breaker contact, cable joint, etc in the production site to prevent abnormal heating due to excessive contact resistance caused by oxidation, looseness, dust and other factors in the operation process Once the monitored temperature node is abnormal, it can respond to the alarm in time, and relevant personnel shall take necessary measures, Avoid safety accidents Wireless temperature centralized monitoring system integrates the functions of data collection, processing, storage, real-time monitoring, curve query, report query, real-time alarm, historical alarm, authority management, etc., which can monitor the temperature of all temperature nodes in the substation and distribution station on line, and provide guarantee keywords for the safe and stable operation of the substation and distribution station: wireless temperature measurement; safe operation; centralized monitoring; Power transformation and distribution station; Acrel-20001 introduction Jilin Chemical Fiber Group Co., Ltd was established and put into operation on August 1, 1964 It is a large-scale comprehensive chemical fiber enterprise integrating the production, commercial trade, construction and installation of chemical fiber and textile yarn It has two listed companies, two joint ventures, three enterprises outside the domain and a textile Industrial Park It is a large acrylic fiber production base in China The group company covers an area of 190 hectares, has more than 10000 employees, total assets of 4.63 billion yuan, and annual profits and taxes of over 350 million yuan The group's leading products include more than 200 varieties of four series, including viscose staple fiber, viscose filament, acrylic fiber and chemical fiber pulp The annual output of viscose staple fiber is 55000 tons The power of the group company comes from two 10kV generators in Qifeng power plant The safe operation of generators and power supply and distribution system equipment is very important This project undertakes the wireless temperature measurement centralized monitoring system of Jilin chemical fiber Qifeng power plant power generation and distribution station, including two-way generator knife switch, switch temperature monitoring, 7 distribution room breaker temperature monitoring, a total of 426 temperature measurement nodes The temperature acquisition equipment is installed in each distribution room, and the monitoring host is installed in the central control room 2 demand analysis is to improve equipment safety guarantee, reflect equipment operation status and reduce equipment accident rate It is necessary to monitor the temperature of the electrical connection points in the high and low voltage distribution cabinet, such as busbar lap joint, circuit breaker contact, cable joint, etc in the production site to prevent abnormal heating due to excessive contact resistance caused by oxidation, looseness, dust and other factors in the operation process Once the monitored temperature node is abnormal, it can respond to the alarm in time, and relevant personnel shall take necessary measures, Avoid safety accidents This paper is suitable for Qifeng power plant The supplier's products are of high safety and reliability, easy to expand, easy to repair and maintain The products provided by the supplier shall at least meet the technical conditions, but otherwise, the technical performance shall meet the requirements for temperature data monitoring of the substation 1.1 the data acquisition system automatically collects the data of all temperature node devices on site It supports multi-threaded processing mechanism, improves data collection efficiency, and can collect data from multiple devices at the same time 1.2 the data processing system analyzes and processes the collected data Such as engineering value transformation and modification, data rationality check, data out of limit processing, calculation of large value, small value and average value, daily and monthly statistics of data, etc 1.3 the data storage system stores and continuously updates the collected data to the SQL Server database The database can be maintained online, adding, reducing and modifying data items The database has high security, all stored data can not be modified to ensure the authenticity of the data 1.4 the real-time monitoring system has a friendly human-machine interface and can display the temperature data of each temperature measurement node in the form of the primary system diagram of the substation and distribution station 1.5 curve query curve query can display the temperature change trend of temperature nodes in a period of time according to the date, so as to facilitate users to compare and find out the power circuit with abnormal temperature nodes and carry out maintenance in time 1.6 report query report query can query the 24-hour historical data of the day according to the date, and can export the excel table, which is convenient for users to edit and use 1.7 the real-time alarm real-time alarm window can alarm all faults and abnormalities of the system, and alarm the temperature data exceeding the limit The system has set the functions of high temperature alarm and over temperature alarm for the safe operation of temperature 1.8 the historical alarm window can query all the fault, exception, operation record, over limit alarm and other event records of the system since operation, so as to facilitate the user to trace and analyze the history of system events and alarms 1.9 authority management to ensure the safe and stable operation of the system, the system has set up the user authority management function Unauthorized operation (such as remote control operation, database modification, etc.) can be prevented by user authority management It can define login name, password and operation authority of different levels of users, and provide reliable security guarantee for microsystem operation, maintenance and management According to the actual situation of Jilin chemical fiber Qifeng power plant, the overall network structure adopts shielded twisted pair networking, which is connected to the serial port server, and then connected to the monitoring host in the central control room through optical fiber, ensuring the stability and real-time transmission of the centralized temperature monitoring system in the power transformation and distribution room The system structure is shown in the following figure: Figure 1 system structure figure 11 temperature centralized display devices and 28 temperature and humidity control devices in the field generator switch cabinet, knife switch cubicle and substation In total, 7 serial ports are connected to the monitoring host in the central control room through 4 optical fibers 2.1 station control management station control management is the direct window of human-computer interaction for the managers of power monitoring system In Qifeng power plant project, it mainly refers to the monitoring host in the central control room 2.2 the communication layer of network communication layer is mainly composed of one serial port server, Ethernet equipment and bus network The main function of the serial server is to monitor the field temperature centralized display device and the temperature and humidity control device; the main function of the Ethernet equipment and the bus network is to realize the data interaction between the sub station and the main station, so that the distribution system management is centralized, informative and intelligent, greatly improving the security, reliability and stability of the distribution system, and truly achieving the goal of unattended 2.3 the field equipment layer of the field equipment layer is the data acquisition terminal, which is mainly composed of the temperature centralized display device and the temperature and humidity control device The intelligent equipment is connected to the serial port server through the shielded twisted pair RS485 interface and the Modbus RTU communication protocol bus type connection, and reaches the monitoring host in the central control room through the serial server for networking and remote control 2.4 bus connection indicates that the field device is connected by hand through shielded twisted pair (rvsp2 * 1.0) Each bus connects about 20 intelligent devices Different types of intelligent devices are connected on different buses, and then the data is uploaded to the serial server, and then the data is uploaded to the monitoring host in the central control room The specific connection diagram is as follows: Figure 2 bus connection diagram temperature centralized monitoring device can display the temperature of all nodes in the current power transformation and distribution room, and the temperature and humidity control device can display the ambient temperature and humidity of the current power transformation and distribution room All intelligent devices can meet the requirements of data interaction with monitoring host through bus transmission 4 System function human-machine interface, displaying the primary system diagram of the substation and distribution station, mainly monitoring the temperature data of all circuits in real time The temperature data of each incoming line and outgoing line can be seen intuitively in the system diagram, as shown in the following figure: Figure 3 10 / 6.6kV primary system diagram 4 6.6/0.4kv primary system diagram historical alarm, which can complete the query of alarm information event records and occurrence time within the query period, provide basis for the personnel on duty and analyze the cause of the accident, as shown in the following figure: Figure 5 historical alarm query trend curve, which can visually view the temperature data of the circuit View the real-time and historical trend curves, click the corresponding buttons or menu items on the screen to complete the switch of corresponding functions; help users to carry out trend analysis and fault recall, with curve printing function It provides intuitive and convenient software support for the analysis of the whole system As shown in the figure below: Figure 6 trend chart report function, you can select time to query, support 24-hour temperature data query at any time, and have data export and report printing functions Reliable report forms are provided for the personnel on duty The name of each circuit in the report is associated with the database, which is convenient for users to modify the circuit name As shown in the figure below, the node temperature of the distribution circuit can be displayed The user can print the report directly or export the EXCEL form for editing As shown in the figure below: Figure 7 report index figure 8 first floor distribution room temperature report communication topology diagram, which mainly shows the networking mode of the system The system adopts a hierarchical and distributed structure and monitors the communication status of the equipment in the Bay layer Red indicates normal communication and green indicates interruption of communication The following figure is the schematic diagram of communication status of power transformation and distribution station Figure 9 communication structure diagram 5 Conclusion In today's application of power generation, transformation and distribution facilities, the safe operation of power plants in large factory buildings is very important This paper introduces the application of acrel-2000 temperature centralized monitoring system in Jilin chemical fiber Qifeng power plant, which can realize the real-time monitoring of the temperature of all power supply and distribution circuits in the power plant, and the system can realize the analysis, processing of the collected data, and real-time display of each power supply and distribution circuit For the temperature data of the circuit, there are pop-up alarm dialog box and voice prompt for the temperature exceeding limit, and various electric energy reports and analysis curves can be generated, which is convenient for the analysis and research of the temperature in a period of time The system is safe, reliable and stable in operation, which provides a real and reliable basis for the safe operation of power generation, transformation and distribution in large factory buildings.