Over Frquency happened at a windy winter night
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[LEFT]
[B][I] at [/I][/B][I][U][F**T="]3:00 am[/F**T][/U][/I][B][I] , A sudden frequency fluctuati** happened , that cause the MW output fluctuate with the grid frequency , Unit 7 was at Coordinated Mode ( Boiler Master – Auto , Turbine Set – Auto ) , The load fluctuated accordingly to the frequency from [/I][/B][I][U][F**T="]105 MW[/F**T][/U][/I][B][I] to[/I][/B][I][U][F**T="] 90 MW[/F**T][/U][/I][B][I], and increased to [/I][/B][I][U][F**T="]105 MW[/F**T][/U][/I][B][I].[/I][/B] [B][I]After a little time, frequency reached [/I][/B][I][U][F**T="]50.1 HZ[/F**T][/U][/I][B][I] – therefore the MW output reached [/I][/B][I][U][F**T="]20 MW[/F**T][/U][/I][B][I],[/I][/B] [B][I]Also, Boiler Master resp**ds by reducing Air Flow and Fuel Gas Flow for the boiler. The load still decreased until it reached [/I][/B][I][U][F**T="]2 MW[/F**T][/U][/I][B][I], and to [/I][/B][I][U][F**T="](-2 MW)[/F**T][/U][/I][B][I], without coming the signal of Reverse Power.[/I][/B] [B][I] At this instant we trip the turbine manually.[/I][/B] [B][I]We wanted to c**serve the boiler to be in service, but [/I][/B][I][U][F**T="]HP-TBV[/F**T][/U][/I][B][I] opens widely ****** [/I][/B][I][U][F**T="]30 sec[/F**T][/U][/I][B][I]., and sucking all drum level to [/I][/B][I][U][F**T="]+267 mm[/F**T][/U][/I][B][I], resulting [/I][/B][I][U][F**T="]MFT[/F**T][/U][/I][B][I] Protecti** to the boiler.[/I][/B] [B][I][F**T="]The first out indicati** of [/F**T][/I][/B][I][U][F**T="]MFT[/F**T][/U][B][F**T="] at [/F**T][/B][U][F**T="]BMS[/F**T][/U][B][F**T="] was [/F**T][/B][U][F**T="](Drum level HH).[/F**T][/U][B][F**T="] “[/F**T][/B][/I] [I][B][F**T="] There were a lot of discussi** and arguments about what is the cause of this accidents , and what should operators do ?[/F**T][/B][/I] [I][B][F**T="] [/F**T][/B][/I] [I][B][F**T="]I attached A chart Table shows the different parameters changed at each same time !! , If any **e has an opini** about what happened , plz tell me !![/F**T][/B][/I] [/LEFT] |
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