I am working in combined cycle power plant and recently i have faced a problem that is

we have 2 gas turbines and 1 steam turbine. Few days ago a dust strom and after that rain came and just after our one gas turbine load reduced approximatley 2 MW.

Reduced load turbine parameter are,

pressure drop just before and after filters= 70.3mmH20
compressor Inlet temperature= 28 C
Compressor discharge pressure= 13 barg
compressor discharge pressure= 408 C

If any body know the cause please comment. waiting for response.