Main Turbine Protection

TURBINE PROTECTION

1)         TG Lub oil pressure very low   (< 1.2 ksc)                

2)         Axial  shift  high (+/-1.0mm)

3)         HP  exhaust  temp. high          (> 500 degc)

4)         Condenser  vaccum  low(VSP)

5)         Condenser vaccum  low(FSP)  (> -0.7 ksc)  AND Turbine speed > 240 rpm

6)         HP casing  top/btm DT high  (> 100 degc) AND  Load >100MW

7)         IP casing front top/ btm DT high  (> 45 degc) AND             Load >100MW

8)         IP casing rear top/ btm DT high  (> 45 degc)  AND Load >100MW

9)         MFT                                                    S/W  &  H/W

10)       Generator  electrical protection           S/W  &  H/W

11)       Liquid in Generator Main leads top  (> 90 mm)

12)       Cold gas temp after cooler A&B high  (> 60 degc)

13)       Cold gas temp after cooler C&D high (> 60 degc)

14)       Primary water temp after cooler high (> 71 degc)

15)       Seal oil temp after cooler high   (> 55 degc)

16)       Hot air main exciter temp high  (> 80 degc)

17)       Stator winding flow very low (< 48 tph)

18)       Stator Main bushing  R flow low (< 1.33 tph)

19)       Stator Main bushing  S flow low (< 1.33 tph)

20)       Stator Main bushing  T flow low (< 1.33 tph)

21)       Turbine over speed trip (electrical)     (> 3330 rpm)

22)       Turbine over speed trip                       H/W

23)       Oil tank level very low ( 1150 mm from top)

24)       Turbine trip from desk operated

25)       Turbine trip from console operated

26)       Turbine trip from ATRS

27)       Emergency trip from HMI     

28)       Fire protection 1 or 2 operated

29)       Generator class B protection

30)       Low Vacuum Trip Device operated

31)       Manual Trip Device operated

1.2)      ALARM LIMITS

1)         TG Lub oil pressure very low (< 4.5ksc)

2)         Axial  shift  high (+/-0.5 mm)

3)         HP  exhaust  temp. high (> 485 degc)

4)         Condenser vaccum  low (FSP)  (> -0.8 ksc)

5)         HP casing  top/btm DT high  (> 90 degc)

6)         IP casing front top/ btm DT high  (> 30 degc)

7)         IP casing rear top/ btm DT high  (> 30 degc) 

8)         Cold gas temp after cooler A&B high   (> 55 degc)

9)         Cold gas temp after cooler C&D high   (> 55 degc)

10)       Stator winding flow very low (< 54 tph)

11)       Stator Main bushing  R flow low (< 1.4 tph)

12)       Stator Main bushing  S flow low (< 1.4 tph)

13)       Stator Main bushing  T flow low (< 1.4 tph)

14)       Turbine over speed   (> 3300 rpm)