Based on the microprocessor 80C196KC

an on-line monitoring system for switchgear is introduced

which can monitor the temperature rising of bus bar

insulation characteristic and mechanical characteristic of switchgear

as well as show the data report on LCD. By using microprocessor

it gathers

processes and analyzes the signals from various sensors and reports the data beyond the threshold that is preset by user through keyboard

and sends data to upper computer through RS-485 communication interface. Because of severe EMI environment the monitoring system works at

some software and hardware immunity measures are discussed.