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Our country has a vast rural territory and large population, so the development of rural substation automation system is particularly important. According to the Technical Guidance on Rural Automation and Communication System Construction (for trial implementation), the rural substation automation adopts automatic mode and gives priority to the mode of layered distribution. This mode, integrated with measurement and control, protection, and communication, is a total solution.
[System theory]
The system structure of the mode of Layered Distribution can be represented by the block diagram as follows:
[Frame]
[system configuration]
PPC-1500T /ICA-852 / PM 1.6G / 512M / 80G
[Evaluation]
The Tablet PC has such advantanges as good stability, high integration (no need to be equipped with an additional monitor, keyboard, mouse), dust-proof, shock resistance, anti-electromagnetic interference and strong impact resistance and other characteristics. Therefore, in the above-mentioned solutions, communications controller mostly uses Tablet PC as the hardware platform. Use of Tablet PC has the following advantages:
1. Color LCD display and touch screen have the display and maintenance functions.
2. On-site debugging completely replaces notebook computers and it can be used as a simple back-up for local functions.
3. Simple operation and convenient maintenance make it especially suitable for unmanned substation.
4. Communication controller supports two-machines hot-spare, and can switch automatically when comes to failure.
5. If the program runs abnormally, WATCHDOG technology will re-start the system program.
6. support multi-baud rate (300 ~ 38400), multi-protocol, multi-forms of communication (RS-232, RS-422, RS-485) communications for 8-12 channel to communicate. supports multi-main station interface. Convenient parameter read and storage, long-term steady operation and easy management.