Design of HCI system in monitor and control centre based on dry-type transformer temperature controller

Abstract

Dry-type transformer temperature controllers are installed on transformers and located in different sites outside, which brings inconvenience to the management and operation. The HCI (human computer interface) in monitor and control centre whose function is complete and direct-viewing can be operated simply and easily, and it can manage and operate many temperature controllers inside the monitor and controller centre. Using RISC(reduced instruction set computer) high speed MCU (micro control unit) ATmega128, a dry-type temperature controller is designed, and then embedding ModBus-RS485 protocol, realizing the data communication between 32 temperature controllers and HCI in monitor and control centre. In this way, a temperature control system is designed. The hardware design and principle of temperature controller are introduced, main functions of HCI system that is designed with Delphi in monitor and control centre are described and design block diagram of the main program is given, with the introduction of embedded Modbus-RS485 protocol and CRC-16 checking. Practice proves that the whole system that consist of temperature controller and HCI in monitor and control centre runs well.