The uncertainty of instruments

time

space

mass-flow of fluid

flow coefficient

flow beam expansion coefficient

differential pressure

density

non main flow measurement

electrical power measurement etc. in thermodynamic test of steam turbine

and the uncertainty of final test results have been analyzed and discussed

and corresponding calculation formula is given. Taking the thermodynamic performance test of a 300MW steam turbine in Yaomeng Power Plant as an example

the uncertainty of actual main flow

main steam flow rate

generator output and specific heat consumption have been calculated.