الفهرس | Only 14 pages are availabe for public view |
Abstract The main idea of this research is how to design a protective system for feeders (parallel transmission lines ). This protection system receive the information from one side only for two parallel lines . This protective system uses appropriate Intel 80386-DX microprocessor (as a differential relay) to initiat tripping, for short circuit in any line of the two parallel lines . This relay works according to a software program which has been written by assembly language which measure the difference between two samples in digital form, taken from the two lines, through one cycle (20 ms). In normal conditions the output signal would be zero while in abnormal condition for any line the output signal may have a value . If there are an output signal then the system would tripe the C.B . Finally , this relay operates as a differential protection system from one side only . With the presence of a communication link, a trip signal would trip the remote end . This thesis includes four main chapters :- 1- Feeder protection using analog relay , unit protection and teleprotection for feeders proictions. 2- Microprocessor based schemes system architecture and a substation based computer for control and protection . 3- Microprocessor updated differential scheme for feeders protection , assembly language , previous efforts and proposed scheme 4- Laboratory setup and results of the proposed scheme and the associate errors |