The run back(RB) strategy for 300 MW

600 MW

and 1 000 MW thermal power units has been presented

the features of RB control strategy being analysed

and the problems needing to pay attention in RB test being put forward.Before the RB test

a simulation test for RB control functions should be carried out

so as to ensure correct activation of RB;in the RB test

overcurrent of electric motors for the forced draft fan

the induced draft fan

and the primary air fan should be prevented

specifying the start-up condition of oil guns under RB state

ensuring the oil guns correctly to be put into operation.