摘要
为实现分布式高压容性介损在线检测(包括电流互感器、套管、耦合电容器、电容式电压互感器等),介绍了基于RS-485总线方式建立的分布式数据采集系统的上下位机之间与RS-485的多点总线式主从应答方式通信,说明了通信格式和串行通信程序流程图。在Windows-NT环境中使用Delphi 6.0采用COMPORT控件实现串口通信。对传送信息的校验和错误处理有4种方法(均值、极大值、均方差、位累加冗余等校验)以提高数据传输的可靠性;并提出串口通信需要考虑的问题,包括计算机端口隔离保护、通信速率与距离的关系等。
To realize the distributed on-line monitoring of high-voltage capacitive dielectric loss for current transformers, bushings, coupling capacitors, capacitive voltage transformers and so on, a distributed data acquisition system is established based on RS -485 bus,in which the multi-point master-slave communication mode via RS - 485 bus is adopted between the superordinate computer and the subordinate computers. The communication format and the flow chart of serial communication are illuminated. The serial communication is implemented with COMPORT of Delphi 6.0 in Windows - NT. There are four methods to enhance the reliability of data transmission: the mean value check, the maximum check, the mean square difference check and the sum redundance check. Some techniques of serial communication are presented, including isolation protection of computer port, relationship between communication speed and distance,and so on.
出处
《电力自动化设备》
EI
CSCD
北大核心
2005年第5期85-87,共3页
Electric Power Automation Equipment
关键词
DELPHI编程
介质损耗
在线检测
串口通信
Delphi programming
dielectric loss
on-line monitoring
serial communication
