In recent years, with the application of IEC61850 standard and the development and putting into use of photoelectric transformers, the concept of digital substation has been applied in engineering practice. A certain number of digital substations have been built nationwide, and pilot projects for digital substations are also underway. The research on smart grid in China has been launched. As an important part of the grid, the research and pilot work in the field of digital substation will also lay the foundation for the development of smart grid.
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The digital substation converts all information acquisition, transmission, processing and output processes of the substation from past analog information to digital information, and establishes a suitable communication network and system. The structure of the digital substation automation system can be physically divided into two categories, namely, intelligent primary equipment and networked secondary equipment; the logical structure can be divided into three levels, according to the IEC communication protocol draft definition, these three The levels are called "process layer", "spacer layer", and "station control layer". The new digital substation consists of a signal acquisition system for all digital and optical fibers, digital relay protection and integrated automation systems, digital video and environmental monitoring systems.
With the unattended promotion of substations, the traditional substation analog video surveillance system has been serving power safety production for many years, mainly to achieve remote patrol equipment, remote operation monitoring, security and other purposes. The rapid development of digital substation puts forward higher requirements for the clarity and intelligence of video surveillance. Based on the current situation of domestic digital substation and the development trend of high-definition intelligent video surveillance, this paper introduces how to combine the HD network camera of Germany MOBOTIX company to build a digital substation HD intelligent video monitoring system through secondary development to realize the overall status and equipment operation of the substation. Intuitive monitoring to assist users in better maintenance of substation production operations.
Overview of overall needs
The traditional substation video surveillance system is mainly based on analog video surveillance. Its low definition and poor anti-interference ability can only see the basic state of the equipment in the surveillance scene. It needs to be zoomed out by the camera lens to see the equipment. Local details. Digital substation HD intelligent video surveillance mainly comes from the following aspects:
(1) In the harsh weather conditions such as thunderstorms, fog and snow, the provincial power company needs to understand the on-site environmental conditions of the 500kV substation of the power grid. The real-time video of the substation and the real-time video of the equipment area provide an important auxiliary means for mastering the real-time situation, but the previous simulation Video systems are often not well implemented.
(2) The design idea of ​​the previous substation video monitoring system is centered around the camera point. The operation process is complex and cannot directly reflect the operation purpose of the operating personnel. After investigation and research, the system can realize high-definition video surveillance of substation based on equipment area and equipment wiring diagram design, with equipment intelligent management as the core, which is simple, intuitive and practical.
(3) The network video surveillance application is a typical real-time streaming media application, which occupies a high network bandwidth. For multiple clients in the monitoring center to access real-time video of the substation, a robust and reliable streaming media service system is required to provide access services.
system structure
The front-end camera adopts German MOBOTIX high-definition network camera to monitor the substation panorama, 500kV equipment area, 220kV equipment area, main control room, gate, perimeter, transformer and auxiliary equipment area. The 100M optical transceiver will encode the compressed video data. It is transmitted to the station-side monitoring center via Ethernet, and is decoded and output by the digital video and environmental monitoring host to the large-screen liquid crystal display. The digital video and environment monitoring host completes the storage and streaming media distribution service of the high-definition video, as well as the on-site perimeter alarm signal acquisition to realize the alarm linkage video.
Applications
According to the planning requirements of a provincial power company, we designed and developed a substation intelligent high-definition video surveillance system in the 500kV substation pilot project, which realized the substation panoramic display and remotely and real-time monitoring of all primary equipment in the substation, such as main transformers and circuit breakers. Isolation of the operating status of the equipment such as the knife gate, transmission of real-time images, alarm information to the monitoring center. It greatly improves the ability of substation operators and dispatchers to comprehensively monitor and analyze substation operation through real-time images and telecontrol information. Its important applications are as follows:
(1) Substation panoramic monitoring
In the past, analog cameras often failed to capture panoramic images of substations, and it was impossible to intuitively and comprehensively understand the overall situation of the entire substation. The MobotixQ24 high-definition panoramic camera is used to capture the panoramic image of the substation, forming a 180-degree surveillance scene image covering the entire substation, and the image of the 500kV equipment area, the 220kV equipment area, and the main transformer equipment area can be seen, and the terminal monitoring terminal is on the large screen. Displayed on the LCD.
(2) Substation entrance and exit HD monitoring
As the access to the substation, the substation entrance and exit is the first line of defense for substation safety. For each personnel and vehicle entering and leaving the substation, detailed records must be made. Therefore, a dedicated camera is required for 24-hour continuous monitoring. In order to meet the special needs of the door monitoring, the camera needs to meet two requirements. 1. High-definition, unlike other areas of monitoring, the gate camera is mainly responsible for recording the entry and exit of personnel and vehicles. It is necessary to clearly distinguish the main characteristics of the personnel, the basics of the vehicle. information. 2, 24 hours without interruption, the substation not only during the day, but also at the night, there are personnel and vehicles in and out. In order to ensure the integrity of the record, it is necessary to have clear monitoring effects at night. Therefore, the design uses the Mobotix M12 three-megapixel dual-lens HD camera, which can also display good image effects in low illumination at night.
(3) HD monitoring of indoor area of ​​substation
Unlike other monitoring areas, the monitoring of indoor areas of substations has the following characteristics:
â—The monitoring area is small, and all the main control room, protection room, cable layer, AC and DC room, battery room, etc., which need to be monitored, have limited indoor space.
â— Most of the monitoring objects are fixed devices. Most of the indoor devices are various types of cabinets.
â— Generally only need to monitor the overall situation. In summary, the substation indoor monitoring is suitable for using a fixed camera, and the lens is a wide-angle lens with a small focal length.
For indoor areas, there are three categories:
â— Main control room, protection room, etc. This type of room has a large space, and there are many entrances and exits such as doors and windows. There are many indoor devices and there are many people entering and exiting. It is necessary to be able to achieve all-round monitoring.
â— AC and DC room, battery room, etc. This type of room has small space, few doors and windows, generally no one is active, no need to monitor every corner, just monitor the overall situation of the room.
â— Cable layer, the cable inside the cable layer is generally placed near the top of the room, and the camera should be able to see the status of the cable from bottom to top.
A MobotixQ24 panoramic HD network camera is installed at the top of the main control room lobby and the protection room of the substation to achieve 360-degree indoor panoramic surveillance.
Since the cable layer cable is located above, the Mobotix M22 HD network camera is easy to install and can adjust the lens angle.
Key technologies and innovations
The main key technologies and innovations of this system are as follows:
(1) Substation HD video surveillance for equipment area management
The system can define substation panorama, 500kV equipment area, 220kV equipment area, main control room, gate, perimeter, transformer and auxiliary equipment area. When the corresponding equipment area is selected, the associated camera image is displayed in multi-screen form.
The associated device area can be displayed on the panoramic video, and the associated device can be displayed on the video of the main device area, and the pop-up video display is performed by the “hot zone†mode.
(2) Power equipment video surveillance based on power primary wiring diagram mode
The system interfaces with the integrated system to superimpose the corresponding equipment information on the primary wiring diagram of the substation. The operator can select the real-time video image of the corresponding equipment by clicking on the equipment of the wiring diagram.
(3). High-definition video streaming service for power communication networks
According to the characteristics of power communication network, the system is designed with high-performance streaming media service software, which can forward multiple high-definition streaming media data at the same time, and has a complete Qos and I frame buffering mechanism.
Conclusion
Through the implementation of high-definition intelligent video surveillance system, the video surveillance image clarity of the substation is improved, and the panoramic effect that can not be achieved by analog monitoring in the past is realized, the number of cameras is reduced, and the monitoring quality is improved. At the same time, through independent innovation based on the device graphics management software application mode, and closely integrated with power applications, achieved practical results.
The research of digital high-definition video surveillance system is in the rapid growth period in China, and it is applied to the field of digital grid substation of smart grid. The high-definition video image is used to record the operation status of key equipment of the power grid, realize online remote monitoring and monitoring, and promote electric power. Safety production is of great significance.
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