Design scheme of intelligent remote monitoring system for gas station

　　1、 Project overview

　　In the natural gas industry, gas gathering and distribution stations, treatment (purification) plants and other field places are the main battlefield of natural gas production. The production process has the characteristics of high pressure, flammability, explosion and high safety requirements. Especially after the comprehensive implementation of gas field optimization and simplified management in recent years, some natural gas production wells have realized unattended. In order to enable managers to grasp the dynamics of the production site in time and reduce the difficulty of production management; It is very necessary to establish a set of all-round remote real-time image information monitoring system to reduce management cost, improve production efficiency and ensure safe and stable production.

　　So how can we effectively grasp the production safety status of these gas wells? This requires the help of a complete set of network video monitoring system, which is a system integrating computer IP video technology, video and audio data compression and decompression processing technology, Internet application technology and embedded web server technology. Through this set of system, the real-time images and data of each gas well can be transmitted back to the network monitoring center, where the real-time status of each front section can be known, and the alarm system is equipped, which can find and solve problems in time, so as to ensure the stable operation of each gas well and safe production.

　　This project is an intelligent monitoring system for gas wells. There are 100 independent gas wells. Each gas well needs to be equipped with a set of alarm system (SMS function can be set, jy-rtu4100) and a set of video monitoring system, including 2 pairs of infrared radiation for perimeter alarm, a smart medium speed ball, real-time acquisition of user's on-site image. The alarm system should not only have local alarm function, It also needs to be transmitted to the control center along with the video signal through the network, and the alarm information of each point can be received in time in the center, so as to take measures in time for processing.

　　2、 Design ideas

　　As each gas well is located in a remote area, cables cannot be erected and can only be transmitted through wireless mode, which requires video and alarm signals to be converted into digital signals for network transmission; In addition, there are two defense areas and one medium speed ball. In order to achieve better linkage effect, the medium speed ball needs to have the preset position function. Each defense area is linked with the preset position of the medium speed ball. When an alarm occurs, valuable real-time images can be captured in time through the preset position function of the medium speed ball.

　　After all video images are transmitted to the network monitoring center, they will be stored in real time for 24 hours to facilitate future data query. In addition, when there is an alarm, in addition to the local alarm signal of the gas well, there needs to be a real-time monitoring picture pop-up in the center to see the scene more intuitively; It has voice alarm prompt, and accurately displays the location of the alarm on the electronic map.

　　3、 Design scheme

　　In order to establish a set of modern gas well intelligent monitoring system integrating prevention, control and management as soon as possible, strengthen the scientificity of management and decision-making of relevant departments, improve work efficiency, ensure the safe operation of each gas well, and provide scientific decision-making basis for managers for temporary emergencies, a complete network video monitoring management scheme is made according to the needs of this project.

　　This scheme is a set of network video management system based on Kaiwei's network video integrated management platform and using wireless bridge. It is mainly divided into four parts: video acquisition, coding transmission, network video centralized management and alarm linkage.

　　3.1 video acquisition:

　　The video acquisition part refers to the Kaiwei HD camera installed at the front end. They are installed at the appropriate position of each gas well to monitor the overall situation of the gas station. Here, we choose Kaiwei 150m 7-inch array infrared medium speed ball camera, which can realize 360 ° continuous rotation and facilitate rapid tracking; Built in 650 line HD low illumination integrated camera, 22 times zoom, color to black and white; The built-in 150m array infrared lamp will automatically turn on at night or when the light is dark, and the camera will automatically switch to black-and-white state; All metal shell, dustproof and waterproof, can be directly used for outdoor installation, so as to achieve 24-hour all-weather monitoring.

　　In addition, the device also has the function of 128 preset positions, which can preset multiple preset positions corresponding to multiple defense areas, and can call the preset positions manually or automatically, so as to facilitate the rapid switching between various defense areas.

　　The output of all cameras are analog signals, which need to be connected to the network video encoder and converted into digital signals for network video remote transmission.

　　3.2 coding transmission part:

　　The coding transmission part is the part where the video signal is converted from analog to digital and transmitted to the network monitoring center through the network. In this project, due to the remote location of each gas well, it is not suitable to set up cables. Therefore, a Kaiwei single channel network video encoder is placed next to the analog camera, which is equipped with four channels of alarm signal input and two channels of alarm signal output. The analog video signals output by the camera and the alarm signals of the two defense areas can be directly converted into digital signals, and the video signals and alarm signals of each gas well can be transmitted to the network monitoring center through the wireless bridge.

　　The network video encoder itself has the function of character superposition. When the camera accesses the real-time image to the network encoder, the encoder can manually mark the information of this video, and send the picture with characters back to the network video integrated management platform through the network in the way of character superposition, so that the image displayed in the network monitoring center, It can display the corresponding necessary information at the same time, such as the name of each gas well, camera number, channel name, date and time, and can be displayed in simplified Chinese characters.

　　3.3 centralized management of network video:

　　Network video centralized management software is the "heart" and "brain" of the whole system and the command center to realize the functions of the whole system. All network video signal alarm signals are connected to the network monitoring center through the network and incorporated into the network management platform through the network video centralized management software. This set of system platform mainly includes the following parts:

　　1) . authentication server:

　　The authentication server is the resource management database server. It is the core of the whole video management platform, mainly including the login authentication of other servers, the access authentication of front-end devices and users, etc. there is a special configuration management center program for configuration management, which can be used for remote configuration management on the same machine or on other machines. With authentication server, its advantages are as follows:

　　(1) Improve network security

　　When the outside world accesses the device through the platform, the first access is the authentication server. Only after the authentication server considers it a legitimate user, can it transfer to the corresponding streaming media server or device according to its corresponding permissions.

　　(2) The equipment is easy to manage

　　If you need to add or delete front-end network devices, you only need to add or delete them in the authentication server through the configuration management center. Nothing else needs to be changed. Each user can naturally see or not see the newly added devices according to their own permissions.

　　(3) The user is easy to manage

　　If you want to add a user, delete a user or change a user's permission or password, you only need to change it directly in the authentication server through the configuration management center, which will not involve other operations. Even if the original user leaves, this system is still very safe.

　　2) , streaming media server

　　The streaming media server has forwarding and storage functions. It is mainly responsible for forwarding the front-end legitimate devices to legitimate network users. It also has multicast function, which is to divide the same image of the front-end into several copies and forward it to multiple users, without increasing the bandwidth from the front-end devices to the center. If necessary, it can also be stored in real time.

　　3) . alarm server

　　For example, after receiving an alarm signal from the front-end server, the user can set the alarm amount through the alarm detection and forwarding function of each alarm server, The corresponding on-site screen can be popped up to the client window of one or more designated users, and the alarm sound, backup video and on-site light can be started at the same time; The person on duty can double-click the alarm information to display the preset defense area information, including alarm level, emergency plan, contact number of relevant person in charge, etc., so as to facilitate the person on duty to respond quickly.

　　4) . client software:

　　The client software of the management platform is divided into three modules: one is the client software with more complete functions, such as user browsing the front-end image, remote monitoring, remote video recording, remote playback, remote control, remote configuration management, receiving or reporting alarm information, opening electronic map and so on, which can display up to 100 pictures at the same time; The other is the client software specially used to receive the alarm. Usually, the front-end image is not browsed, but when there is an alarm at the front-end, the alarm screen will pop up and the alarm sound will be started; The other is the electronic map client, which is used to pop up the electronic map and display the actual position of the monitoring point when giving an alarm. The functions of the three client modules are different. You can choose to start the corresponding client module according to the time needs of users.

　　5) . web server:

　　Some users feel that it is inconvenient to go elsewhere and install the client software, so start the web server and you can log in to the authentication server through ie at any time. The authority is the same as that of the client, and you can browse and play back any channel screen. It also has the function of electronic map to see the specific location of each monitoring point.

　　6) Digital matrix server

　　The digital matrix server can freely switch any picture of the front end to the enlarged display on the TV wall, but it can realize manual or automatic switching, which is convenient for the personnel on duty to understand the situation on site more intuitively.

　　3.4 alarm linkage:

　　Because the safety of each gas well is very important, including the operation safety of equipment and the personal safety of illegal intruders, it is necessary to install a set of intrusion alarm system in the substation. When someone breaks in illegally, in addition to the local alarm signal, it can also send an alarm signal to the network monitoring center in time.

　　For this project, two pairs of shooting are designed and installed to prevent illegal intrusion. The alarm signals of the two defense areas are directly connected to the one-way video encoder of Kaiwei, and the video encoder can be set to link with the preset position of the medium speed ball, that is, when the defense area triggers the alarm, the medium speed ball can automatically move to the preset position to capture the alarm image in time. The alarm output of the encoder can trigger the local audible and visual alarm signal, and the user can warn the intruder, Ensure equipment and personal safety.

　　While triggering the local alarm, the encoder also transmits the alarm signal to the monitoring center through the wireless network, and realizes a series of alarm information in the monitoring center, such as popping up the alarm picture, starting the sound alarm output, and accurately displaying the specific alarm position in the electronic map, which is used to prompt the personnel on duty to pay attention in time and take corresponding measures.

　　All alarm systems adopt normally closed signal transmission and have anti disassembly and anti destruction functions.

　　4、 System features:

　　(1) The monitoring interface adopts the general operation interface of Chinese windows, which provides online Chinese help. It can name and number each monitoring object of the system, and operate the object through the object name.

　　(2) The operation and maintenance personnel can control any camera to adjust the camera angle, orientation, focal length, aperture and depth of field; For spherical camera or PTZ with preset position, the operator can operate the preset position, and the preset position can be defined.

　　(3) It can remotely control the action of camera lens, pan tilt, wiper and the on and off of lighting equipment through computer mouse.

　　(4) One machine displays multiple images on the same screen. It can realize 1-way, 4-way, 9-way, 16-way, up to 100-way display on the same screen.

　　(5) It can realize various rotation inspection methods, such as station rotation inspection, station camera rotation inspection and preset position rotation inspection. Users can customize the rotation inspection scheme and set the rotation inspection time. It can automatically inspect each station end and find station end faults in time.

　　(6) The parameters of frame rate, code stream and image resolution can be set manually through the software operation interface, or the parameters such as frame rate and resolution can be automatically adjusted according to the preset scheme to adapt to the change of network bandwidth.

　　(7) Any substation can be selected for communication and monitoring, and the voice intercom (full duplex) with the station end can be realized without occupying additional bandwidth and additional wiring.

　　(8) The character superposition of video channel is realized by software, and the superimposed characters can be set flexibly.

　　(9) It has a variety of video recording methods, which can be customized. During video recording, the alarm point information and image will be stored, and the above information will be displayed during playback; When querying the image history, the related images can be retrieved according to the alarm point information.

　　(10) In case of concurrent alarms, the system can receive all alarms in turn without losing alarm information.

　　(11) Realize current alarm query, alarm history query, video history query, operation history query, etc.

　　(12) The defense deployment and withdrawal strategy can be set remotely, and the defense deployment or withdrawal can be carried out automatically according to the preset strategy.

　　(13) The position, effective range and alarm state of camera, ball machine, anti-theft alarm and other equipment can be intuitively displayed on the electronic map.

　　(14) The time synchronization function is provided. The time of each part of the system is subject to the server time, which is calibrated in real time to maintain the synchronization of the clock with an accuracy of milliseconds.

　　(15) It can preset or save the information of each station on the server of the monitoring center to facilitate construction and maintenance.

　　(16) Support remote software upgrade.

　　(17) The monitoring system has a hierarchical monitoring function based on the concept of authority. Operators with high priority authority can seize the control right of low priority authority, but do not affect the browsing right of the latter. Operation control is unique, and only one operator is allowed to control the same control object at the same time.

　　(18) It has strict password authentication mechanism and user authority management function. According to the nature of work, each user can be given different authority levels, and the authority can be set.

　　(19) The system can record all important operations such as user login and operation control, query and count the operation records, and all operation records can not be deleted and changed.