Abstract:

Along with the increase of unit capacity, the single signal of some important protection systems influences on the reliability of the system.

According to the requirements of the file DL/T 5428—2009‘Technical Code for Design of I&C Protection System in Fossil Fuel Power Plant’, and the file DL/T

1083—2008‘Specification of Distributed Control System for Fossil Fuel Power Plant’, aiming at the current situation of the FSSS protection system of

Huadian Weifang Power Generation Company Limited, in which some signals are singlechannel signals and there is not the alarm function for single signal

failure, the functions of important protection signals were improved. The improved important protection system signals ensure safe and stable operation of the system.

Key words: single channel, important protection signal, FSSS (furnace safeguard supervisory system) hardware protection system, function improvement