Abstract
110KV lines from the computer through the protection of computer protection equipment to achieve the monitoring of transmission lines, computer protection equipment, including data collection system, CPU main system, switching of input / output circuit, tripping circuit exports and logic circuits. CPU main system which includes microprocessors, memory and Xiangying interface. By ADC ADC signal sent to the main system CPU, and then from the main system judge whether a fault line. If there is fault, CPU tripping the main system issued an order, the 110 KV transmission lines to the safe operation of protection. In addition, three of the distance that the protection of the working principle, the three-phase distance protection parameters were calculated and determined action of the whole earth and three from the protection of parameters and action of the entire set. Computer verification of the 110 KV from the protection of the Three-stage distance protection. Also designed the system work flow chart and related flow chart of the principle that one main program, including initialization and self-inspection of two major part of the main program to better cope with the disruption procedures and fault procedures, the preparation of the relevant distance protection The main program, suspended from the service program designed to protect from the failure to protect the design process. Computer protection through the design, three from the protection of computing and related procedures designed so that the whole system of combining organic and achieve a 110 KV line from the computer protection.
Key words：Distance Protection; Three-phase distance protection parameters; Data Acquisition System; Interrupted service program
