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1. System background
Although the foundation of the transmission line iron tower installed in the field is strong, it is prone to tilt due to the long-term influence of crustal movement, weather environment, and man-made construction (such as field blasting in the case of road construction). When the inclination reaches a certain level, or the change in the stress of the iron tower caused by the inclination, it may cause deformation of the iron tower, which may cause production and safety problems such as galloping, breaking of the transmission line, and even the collapse of the iron tower.
As for the early prediction of the inclination of the tower, the current method is that the line patrol staff carry heavy instruments and equipment, arrive near the tower, and then deploy the equipment for measurement. This is not only inefficient, but also inaccurate and timely. It cannot fundamentally solve the early prediction of the tilt of the tower, eliminate potential safety hazards in time, and ensure the normal progress of production.
Due to the above reasons, there is a need for a method that can complete the automatic detection of the tilt of the iron tower. At the same time, it is necessary to transmit the detection signal of the field site to the monitoring center and publish it on the internal network of safe production, so as to facilitate the real-time monitoring, statistics and analysis of the relevant personnel. . This solution uses mature, low-cost GPRS technology to ensure the advanced nature of the system while maintaining the reliability of the system. Each wireless detection module can be installed flexibly, and no other wiring is needed, so it is more safe and reliable. In addition, after the data of multiple measurement points are connected into a network, it is convenient for unified management and realizes networked and automated management.
2. System design goals
The system design goal is divided into three steps. First, design the wireless terminal collection equipment, including the selection and finalization of deformation, tilt and vibration sensors, and the realization of the collection circuit and processing algorithm; then design the installation of the wireless terminal equipment and the design of the system working power supply according to the structural characteristics of the tower ; Finally, the back-end processing software is designed to make the tower tilt, vibration detection automatic, wireless, networked and safe.
Three, the composition of the system
The system consists of sensor modules, wireless detection terminals, system power supply, Web server and its management software. Among them, the first three are installed on site in this system and are called front-end equipment.
The wireless detection terminal is installed near the detection point and is responsible for collecting data such as inclination and vibration from the sensor module, and converting these data into wireless channel data for transmission; the Web server is equipped with a wireless receiving module and a server, which receive data from wireless channels. Detect the wireless channel data of the terminal and record it in the local database so that the authenticated user can access it through the IE browser. The wireless detection terminal, the sensor module, and the battery of the system power supply are installed in a metal casing, and the solar cells are fixed outside the casing and installed on the iron tower uniformly.
3.1 System composition
The wireless detection system using wireless network technology realizes real-time online detection of tower tilt and vibration. After connecting to the internal network of the power system, the operating status can be monitored in the central monitoring room, which truly achieves remote telemetry. When the point inclination or vibration exceeds the preset threshold, an alarm signal will be issued to remind the relevant personnel to take measures in time.
3.2 System characteristics
Real-time: real-time online monitoring;
Accuracy: The accuracy of measuring inclination can reach ±0.1°;
Flexibility: Users can set parameters flexibly and conveniently according to their needs;
Security: Whether it is products, tools, and maintenance, they have system security and reliability;
Collection method: timing collection.
Figure 1 System structure network structure diagram
1) Sensor part
The tilt sensor is shown in the figure below:
Figure 2 Schematic diagram of tilt sensor
The schematic diagram of the vibration sensor is as follows:
Figure 3 Schematic diagram of vibration sensor
2) Wireless detection terminal
The wireless detection terminal is the core of the system, responsible for the inclination, vibration data collection and GPRS data transmission of the system. Due to the use of foreign mature radio frequency transmitting and receiving integrated circuits, the work is stable and reliable. After many engineering application tests, it fully meets the system design indicators.
The GPRS data transmission part adopts the passive transmission method, that is, when there is vibration exceeding the threshold, the data is uploaded; or, the collected inclination detection data is uploaded regularly. Therefore, there is no need to connect the device to the GPRS network at all times, nor to continuously transmit data, so the GPRS data flow is not large.
Assume that the inclination data is collected every hour and uploaded. The inclination data collected each time is calculated according to 100 bytes, and the other network data traffic required for uploading data is 400 bytes each time, totaling 500 bytes; the traffic required per day is 12K bytes, and the traffic required per month is 360K byte. In addition, if there is vibration that exceeds the preset threshold, data will be uploaded at the same time, assuming that the amount of data uploaded each time is also 500 bytes; assuming that there is one vibration data upload every day, the monthly traffic will be 15K bytes. The total traffic is 375K bytes.
Considering other unknown reasons, the monthly traffic is set at 500K bytes. Currently, China Mobile’s GPRS charge is 0.01 yuan/K bytes, and the monthly fee is 5 yuan. If the traffic is large, you can consider the monthly GPRS network, the general cost is 5 yuan for 10M bytes of traffic, which is completely enough. Therefore, the daily maintenance cost is very low, basically the monthly cost of each point is less than 5 yuan.
3) Power supply
According to the block diagram of the system, because the wireless detection terminal is placed on the iron tower, that is, outdoors, it must be powered by a battery; and because the wireless detection terminal includes a wireless transmission module and a sensor module. Therefore, the power supply of the system adopts solar batteries, providing 12V voltage and 12Ah current, and is equipped with a solar battery dedicated battery to provide enough electricity for the system in rainy weather and to store electricity when the weather is better.
4) Remote data transmission
1. Wireless network interface data transmission: Due to the mature GPRS communication method, data can be transmitted back to the monitoring center wherever there is a mobile network.
2. Data release via Ethernet. In the computer room with Ethernet interface, the tilt, vibration and other data collected from the wireless network can be directly transmitted to the control center through the 10M/100M network port.
3.3 Software of the testing center
The inspection center software is a graphical server software running on Windows. The client directly accesses the server through the IE browser to query various forms of tilt and vibration data.
1) Graphical display form: it can monitor the continuous change of inclination and vibration on site, expressed in the form of a graph; it can also monitor the discrete change of inclination and vibration, expressed in the form of a bar graph;
2) Realize the storage and management of tilt and vibration data. Realize historical data query: query historical data according to the time period set by the user, wireless detection node address, and sensor number. Print reports according to query results and styles (reports can be customized);
3) When the inclination and vibration exceed the specified value, an alarm message will be issued to remind the operator to troubleshoot the corresponding knife switch;
4) The application software of this control system adopts plug-in or embedded (with interface) design, the software is easy to install, simple to operate, complete functions, and convenient to maintain. Under the condition of data communication with the computer room, the manager can remotely set the alarm value of each tilt and vibration sensor, and define different levels of alarm methods. If there is an abnormality, the management staff can be notified in time by sound or other means. When an alarm occurs, the alarm item in the software is displayed in red.
Chongqing Qinzhi Technology Co., Ltd.
Phone: 023-68691867
Fax: 023-68696923
Contact: Hu Dingjun
website:
www.spriew.com
Company Address: 15th Floor, Gaochuang Jinye Building, 18# Yuzhou Road, Shiqiaopu, Jiulongpo District, Chongqing
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