Load Rejection Test (Governor Test)
 

[B] [URL="http://science-hamza.blogspot.com/2010/12/load-rejecti**-test-governor-test.html"]Load Rejecti** Test (Governor Test)[/URL] [/B]

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[F**T=Verdana][B]The purpose of Turbine Load Rejecti** Test is to verify and dem**strate the governor functi** to sustain a load rejecti** in order to prevent the turbine from overspeed tripping, steady speed c**trol at no-load operati** and remain in service without any adverse effect to the turbine.[/B][/F**T]
[F**T=Verdana][B]The test requires skillful and appropriate operati** not **ly for turbine , but also for boiler and its auxiliaries.[/B][/F**T]
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[F**T=Times][I][U][B]Items to be c**firmed for Load Rejecti** Test[/B][/U][/I][/F**T]
[F**T=Verdana][B]1-Turbine main valves[/B][/F**T]
[F**T=Verdana][B]2-GV no load valve positi**[/B][/F**T]
[F**T=Verdana][B]3-Lube oil pump auto start test[/B][/F**T]
[F**T=Verdana][B]4-Protective device test[/B][/F**T]
[F**T=Verdana][B]5-Valve transfer from MSV mode to GV mode[/B][/F**T]
[F**T=Verdana][B]6-Overspeed tripping point (111% speed)[/B][/F**T]
[F**T=Verdana][B]7-OPC (Overspeed Protecti** C**troller) functi**[/B][/F**T]
[F**T=Verdana][B]8-Exclusi** of Interlocks (Turbine Trip due to Boiler Trip)[/B][/F**T]

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[F**T=Times][I][B][U]TEST PROCEDURE[/U][/B][/I][/F**T]

[I][B]*Before Load Rejecti** Test ([U]**e hour[/U])[/B][/I]
[F**T=Verdana][B]1-C**firm steady c**diti** of load operati**[/B][/F**T]
[F**T=Verdana][B]2-Perform mechanical Over Speed Oil trip Test[/B][/F**T]
[F**T=Verdana][B]3-Perform Lub. oil pump auto start test[/B][/F**T]
[F**T=Verdana][B]4-change over unit auxiliary bus from unit auxiliary transformer to start up transformer.[/B][/F**T]
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[I][B]*Before Load Rejecti** Test ([U]30 minutes[/U])[/B][/I]
[F**T=Verdana][B]1-C**firm that level of( C**denser , De aerator and HP/LP feed water heaters are ****** range[/B][/F**T]
[F**T=Verdana][B]2-c**firm that AVR in automatic mode[/B][/F**T]
[F**T=Verdana][B]3-C**firm that HP and LP Turbine bypass ( valves and Sprays ) are in automatic mode[/B][/F**T]

[F**T=Times][I][B]*Before Load Rejecti** Test ([U]10 minutes[/U])[/B][/I][/F**T]
[F**T=Verdana][B]1-c**firm the appointed time with the load dispatcher[/B][/F**T]
[F**T=Verdana][B]2- Exclude the interlock of (Turbine Trip due to Boiler Trip)[/B][/F**T]
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[F**T=Times][I][B]*Before Load Rejecti** Test ([U]0 minute[/U])[/B][/I][/F**T]
[F**T=Verdana][B]1-Open Circuit breaker of the Generator.[/B][/F**T]
[F**T=Verdana][B]2-If the Overspeed trip device doesn't operate c**trary to expectati**s even when the turbine speed exceeds 111% of the rated speed , Trip immediately the turbine.[/B][/F**T]
[F**T=Verdana][B]3-All observers shall read and record "Maximum or Minimum" of the measuring objects during transient c**diti**[/B][/F**T]






[F**T=Times][U][I][B]After Load Rejecti**[/B][/I][/U][/F**T]
[F**T=Verdana][B]Pay attenti** to the following points and see that there is no distincti** about them.[/B][/F**T]
[F**T=Verdana][B]-Turbine speed[/B][/F**T]
[F**T=Verdana][B]-Rotor Positi** & Vibrati**[/B][/F**T]
[F**T=Verdana][B]-BRG temp. and Vibrati**[/B][/F**T]
[F**T=Verdana][B]-C**denser Vacuum and hotwell level[/B][/F**T]



[I][U][B]Stabilizati**[/B][/U][/I]
[F**T=Verdana][B]-Stabilizati** will be judged when turbine speed is stabilized approx. 3000 rpm by GV & ICV speed c**trol[/B][/F**T]




[F**T=Times][I][B][U]Test Acceptance Criteria[/U][/B][/I][/F**T]
[F**T=Verdana][B]If maximum instantaneous speed is restricted below overspeed trip limits (111 %) ,therefore the load rejecti** test is regarded as successful.[/B][/F**T]




[F**T=Times][U][I][B]C**firmati** items after Stabilizing[/B][/I][/U][/F**T]
[F**T=Verdana][B]-GVs are restored in no load positi**[/B][/F**T]
[F**T=Verdana][B]-turbine speed is c**trolled at near synchr**ous level[/B][/F**T]
[F**T=Verdana][B]-No abnormality is observed at electrical room and local positi**s.[/B][/F**T]




[F**T=Times][I][U][B]Emergency Case[/B][/U][/I][/F**T]
[F**T=Verdana][B]If boiler trips by boiler protecti** , turbine shall be immediately tripped.[/B][/F**T]

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