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BN 3500 Rack is installed for Steam Turbine protection. Different signals become Bad for 10 sec and then become ok. The HP differential expansion signal connected with Module 3500/45, became bad and then became ok. This repeated many times. Now Radial Vibration 5Y connected with Module 3500/42, became bad and then became ok. This repeated many times.
Please help why different signals of different modules become bad and become ok.
Please help why different signals of different modules become bad and become ok.