Abstract:

Traditional display terminal for relay protection devices are often modified with the upgrading of software and nonstandard requirements. In order to meet the universal requirements of the display terminal, a design and implementation of a universal display terminal for protection devices is proposed. The display terminal based on the design above, whose interface graphics can be drawn directly without code writing, adopts independent CPU and has its own fonts files. There are two major tasks under the terminal programs software framework, which are interface service processing based on mailing and communication with protection device based on RS-232 serials. This display terminal has versatility in application, and it neither relys on protection device, nor be restricted by hardware platform or applications. The correctness and practicability of the display terminal has been proved by the successful trial in the distribution terminal of a 10kV distribution network.

Key words:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">relay protection device, display terminal, universal protection, mailing, interface service, distribution terminal