الفهرس 
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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