According to the strategic deployment of the national grid construction and strong power grid, the intelligentization of rural power grids will be used as a pilot project to promote the innovation and development of power distribution technology. In July of this year, the State Grid drafted and proposed the latest technical indicators to standardize intelligent distribution terminals. What are the contents of the latest indicators?
In order to speed up the construction and transformation of the distribution network, promote transformation and upgrading, the National Energy Administration issued the "Action Plan for the Transformation and Reform of the Distribution Network (2015-2020)", clearly increasing the capital investment in the distribution network. From 2015 to 2020, distribution The investment in network construction and transformation shall not be less than 2 trillion yuan. Through implementation, by 2020, the intelligent construction and application level of distribution network will be greatly improved, and the reliability of power supply will reach 99.99%, which will comprehensively solve the problem of weak urban and rural power grids.
Figure 1 Distribution network
In the transformation of rural power grids in recent years, the State Grid has upgraded various power supply equipment in large areas. Among them, JP cabinets will be upgraded in the transformer station area. The JP cabinet is the abbreviation of the distribution transformer integrated power distribution cabinet, as shown in Figure 2. Whether it feels very common, even everywhere around you.
Figure 2 Rural network transformation JP cabinet
Who is the target of the new national grid indicator? Then it is necessary to mention our protagonist today, the brain in the JP cabinet - "Intelligent distribution terminal" as shown in Figure 3:
Figure 3 intelligent distribution terminal
First, the latest intelligent distribution terminal technical requirementsAccording to the operational characteristics of the rural power grid, the State Grid Corporation has learned from the past construction and use experience of agricultural networks, standardized the technical requirements of intelligent distribution terminals, and proposed environmental requirements, power requirements, functional requirements, technical indicators, and reliability of intelligent distribution terminals. Detailed requirements. Prior to this, the agricultural network intelligent low-voltage distribution box fully complied with the Q/GDW 614-2011 issued by the State Grid Corporation of China, "Farming Network Intelligent Low-Voltage Distribution Box Functional Specifications and Technical Conditions" and Q/GDW 615-2011 Intelligent distribution terminal functional specifications and technical conditions are designed, manufactured, managed and maintained. The latest proposed intelligent distribution terminal technology requirements are as follows:
1. Environmental requirements
See Table 1 for details of ambient temperature and humidity requirements.
Table 1 Ambient temperature, humidity
2, power requirements
AC three-phase four-wire power supply is used. When the system is faulty (two-phase power is disconnected when three-phase four-wire power supply), the AC power supply can be used for normal operation of the terminal. The specific power supply technical parameters are as follows:
l Rated voltage: AC220V/380V, 50Hz;
l Allowable deviation: -30%~+30%;
l If the terminal is powered, powered off, or the power supply voltage rises slowly or slowly, it should not be mistaken or misfired. When the power returns to normal, it should automatically resume normal operation.
l The data saved is not lost after the power is restored, and the internal clock runs normally.
3, functional requirements
The terminal function consists of basic functions and extended application functions. The basic functions are mandatory and the extended functions are optional. The basic features include the following sections:
l Distribution monitoring function
l Switching acquisition
l reactive power compensation control function
l Residual current action protector monitoring function
l Low-voltage switch position information collection function
l Power information monitoring function
l Three-phase unbalanced management function
l Transformer condition monitoring function
l Environmental status monitoring function
l Data logging and remote transmission
l Maintenance function
l Data statistics function
l Local indication function
l Time function
l Security protection
l Plug and Play automatic configuration
4, technical indicators
l Software architecture requirements;
Open, with third-party software portability;
l hardware architecture requirements;
With strong computing and storage capabilities, it is easy to add new business functions. The CPU should be dual-core, the main frequency should be above 600MHz, the memory should be above 512M, and the FLASH should be above 1G, all of which are industrial grade chips.
l analog quantity;
Accurate measurement range:
Voltage: 0.7~1.3UN; 0~264V; current: 0~6A; frequency: 45Hz~55Hz.
measurement accuracy:
Voltage: ≤±0.5%; current: ≤±0.5%; frequency: ≤0.01Hz; active power: ≤±1%; reactive power: ≤±1%; power factor: ≤±1%; apparent power: ≤ ±1.0%; electrical metric: ≤1.0%.
Input status quantity:
l Support single point remote signaling;
l Power supply 24V;
l The software anti-shake time can be set from 10 to 60000 milliseconds, and the event recording resolution is no more than 10 milliseconds.
5, reliability
The MTBF of the equipment body should be no less than 50000h; the service life of the terminal should be 8-10 years.
Second, ZLG Zhiyuan Electronics is based on Cortex-A9 embedded solutionGrid transformation covers a wide area, requiring low-cost, high-stability, harsh environmental adaptability equipment. ZLG Zhiyuan Electronics Cortex-A9 series core board products, with rich interface resources and industrial quality, are very suitable for the display control unit as the main controller of intelligent distribution terminal. The display control unit mainly includes functions such as numerical control display, matrix keyboard, data download, data upload, status indicator control, partial data monitoring, data analysis and processing.
The following figure shows an application example of ZLG Zhiyuan Electronics based on the industrial control core board in the intelligent distribution terminal:
Figure 4 Intelligent power distribution (variable) terminal core board application example
The block diagram of ZLG Zhiyuan Electronics based on Cortex-A9 embedded solution is as follows:
Figure 5 Block diagram based on Cortex-A9 embedded solution
The latest technical indicators proposed by the State Grid are system requirements: developability and support third-party software migration. ZLG Zhiyuan Electronics Cortex-A9 industrial control core board supports embedded Linux system and standard Ubuntu system with secondary development and software portability to ensure system security and stability. The remaining indicators are shown in Table 2 and compared with the M6708-T parameters:
Table 2 Comparison of technical parameters of intelligent distribution terminal
Through the data of the above table, the core board of ZLG Zhiyuan Electronics Cortex-A9 has more advantages and function extensions while meeting all the indicators of the new standard, as shown below:
l LVDS, LCD, HDMI and other display interfaces provide options;
l 2-way USB interface, which can be extended to 5 channels of USB through HUB to meet the simultaneous use of multiple peripherals such as mouse, keyboard and U disk;
l 2-way CAN bus, the data bus that X86 cannot directly have;
l 2-way IIC, which can be used for data monitoring;
l 3-way multiplexed SPI to enrich the data bus for acquisition and control;
l 2-channel SD card, which can provide 1 WIFI module and 1 TF card, and single-channel TF card supports 32G (currently supports up to 64G);
l 1-way standard SATA 2.0, this feature is only supported by quad-core boards to meet the needs of user data storage expansion;
l 2-way Mini PCIE interface, one channel supports Wi-Fi, ZigBee, LAN MiniPCIE module; one channel can support 2G/3G/4G WAN MiniPCIE module.
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