The document describes the turbine protection system logic. It includes logic for multiple turbine overspeed trips, axial displacement trips, lube oil pressure trips, exhaust temperature trips, condenser vacuum trips, manual trips, transformer and generator protection trips, vibration trips, and other parameters. The logic uses AND and OR gates to monitor sensor readings and issue trip outputs as needed to protect the turbine system.

1. Turbine Overspeed 1
Turbine Overspeed 2
Turbine Over peed 3
And
gate
And
gate
And
gate
>=1
SR
Set
Reset
Turbine reset
Turbine
Overspeed trip
output 1
SR
Set
Reset
Large Axial displacement Trip
Output
Turbine reset
Axial Shift HH trip 1
Trip 1
Trip 2

2. Pressure 1 of Bearing lube oil
Pressure 2 of Bearing lube oil
OR gate
>=1
OR gate
>=1
And
gate
SR
Set
Reset
Low Lube oil
pressure trip
output
Pressure 3 of Bearing lube oil
Pressure 4 of Bearing lube oil
Turbine reset
EH Oil Pressure LL1
EH Oil Pressure LL2
OR gate
>=1
OR gate
>=1
And
gate
SR
Set
Reset
EH oil pressure Low
trip output
EH Oil Pressure LL3
EH Oil Pressure LL4
Turbine reset
EH oil pressure LL
trip of BFPT A
EH oil pressure LL
trip of BFPT B
Trip 3
Trip 4

3. Temp 1 of LP Cylinder A Exhaust Trip
Temp 2 of LP Cylinder A Exhaust Trip
Temp 3 of LP Cylinder A Exhaust Trip
And
gate
And
gate
And
gate
And
gate
SR
Set
Reset
Turbine reset
LP Cylinder A
Exhaust temp
High Trip
Output
Temp 1 of LP Cylinder B Exhaust Trip
Temp 2 of LP Cylinder B Exhaust Trip
Temp 3 of LP Cylinder B Exhaust Trip
And
gate
And
gate
And
gate
And
gate
SR
Set
Reset
Turbine reset
LP Cylinder B
Exhaust temp
High Trip
Output
Trip 5
Trip 6

4. OR gate
>=1
OR gate
>=1
And
gate
SR
Set
Reset
Condenser A (HP) Vacuum L
Trip 7
Condenser A (HP) Vacuum LL2
Condenser A (HP) Vacuum LL1
Condenser A (HP) Vacuum LL3
Condenser A (HP) Vacuum LL4
Main steam value fully closed
And
gate
SR
Set
Reset
Turbine reset
Low Condenser
A vacuum trip
output
OR gate
>=1
OR gate
>=1
And
gate
SR
Set
Reset
Condenser B (LP) Vacuum L
Trip 8
Condenser B (LP) Vacuum LL2
Condenser B (LP) Vacuum LL1
Condenser B (LP) Vacuum LL3
Condenser B (LP) Vacuum LL4
Main steam value fully closed
And
gate
SR
Set
Reset
Turbine reset
Low Condenser
B vacuum trip
output

5. SR
Set
Reset
Manual trip output
Emergency turbine trip Button trip
Trip 9
Turbine reset
SR
Set
Reset
Trip of thrust bearing metal temperature High
Trip 10
Turbine reset
Temperature High of Thrust
bearing metal trip output
SR
Set
Reset
Trip 11
Turbine reset
DEH Trip Trip Output
Turbine reset
DEH Trip
SR
Set
Reset
Trip 12
Turbine reset
Turbine cylinder wall
temperature difference HH
trip output
Turbine cylinder wall temperature difference HH
SR
Set
Reset
Trip 13
Turbine reset
LP Cylinder Excess Expansion
Difference output trip
Differential Expansion HH of LP
Cylinder Trip

6. SR
Set
Reset
Temp of Steam in MSV inlet LL
trip output
Temp of Steam in MSV inlet Low
Trip 14
Turbine reset
MFT 3 to ETS
MFT 2 to ETS
MFT 1 to ETS
And
gate
And
gate
And
gate
And
gate
SR
Set
Reset
Turbine reset
MFT Trip
Output
Trip 15
SR
Set
Reset
G-T non electric protection
trip output
GT Non electric protection trip
Trip 16
Turbine reset

7. SR
Set
Reset
Abnormal signal of Reheater
temp trip output
Temperature of HRH steam abnormal
Trip 17
Turbine reset
SR
Set
Reset
G-T non electric protection
trip output
GT Non electric protection trip
Trip 18
Turbine reset
Main oil tank level Low 1
Main oil tank level Low 2
Main oil tank level Low 3
And
gate
And
gate
And
gate
>=1
SR
Set
Reset
Turbine reset
Main oil tank
level low trip
Trip 19

8. SR
Set
Reset
Hp heater level high trip
output
Not Assigned
Trip 20
Turbine reset
SR
Set
Reset
Turbine Shaft vibration high
high trip output
mTSI Trip
Trip 21
Turbine reset
OR gate
>=1
Main Transformer Protection
trip B
Main Transformer Protection
trip A
SR
Turbine reset
Set
Reset
Main transformer protection
trip output
Trip 22
SR
Set
Reset
Bearing metal temperature
High Trip Output
Trip of bearing metal temperature High
Trip 23
Turbine reset

9. SR
Set
Reset
Metal in HP cylinder Exchaust
temp High trip output
Trip 24
Turbine reset
Not Assigned
OR gate
>=1
Generator Protection trip B
Generator Protection trip A
SR
Turbine reset
Set
Reset
Generator protection trip
output
Trip 25
OR gate
>=1
Generator side Breaker Trip 2
Generator side Breaker Trip 1
SR
Turbine reset
Set
Reset
Generator side breaker trip
output
Trip 26
SR
Set
Reset
HP/IP Cylinder Excess
Expansion Difference output
trip
Trip 27
Turbine reset
Differential Expansion High & Medium
Cylinder HH Trip

10. SR
Set
Reset
Trip Spare 1 output 1
Trip 28
Turbine reset
Not Assigned
SR
Set
Reset
Trip Spare 2 output 1
Trip 29
Turbine reset
Not Assigned
SR
Set
Reset
Trip Spare 3 output 1
Trip 30
Turbine reset
Not Assigned
SR
Set
Reset
Trip Spare 4 output 1
Trip 31
Turbine reset
Not Assigned
SR
Set
Reset
Trip Spare 5 output 1
Trip 32
Turbine reset
Not Assigned

11. SR
Set
Reset
Trip spare 6 output 1
Trip 33
Turbine reset
Not Assigned
SR
Set
Reset
Trip spare 7 output 1
Trip 34
Turbine reset
Not Assigned
SR
Set
Reset
Trip spare 8 output 1
Trip 35
Turbine reset
Not Assigned

12. Turbine Overspeed trip output 1
Large Axial displacement Trip Output
Low Lube oil pressure trip output
EH oil pressure Low trip output
LP Cylinder A Exhaust temp High Trip Output
LP Cylinder B Exhaust temp High Trip Output
Low Condenser A vacuum trip output
Low Condenser B vacuum trip output
Manual trip output
Temperature High of Thrust bearing metal trip output
DEH Trip Trip Output
Turbine cylinder wall temp difference HH trip output
LP Cylinder Excess Expansion Difference output trip
Temp of Steam in MSV inlet LL trip output
MFT Trip Output
G-T non electric protection trip output
Abnormal signal of Reheater temp trip output
1-8 Bearing vibration HH trip output
Main oil tank level low trip
Hp heater level high trip output
Turbine Shaft vibration high high trip output
Main transformer protection trip output
Bearing metal temperature High Trip Output
Metal in HP cylinder Exchaust temp High trip output
Generator protection trip output
Generator side breaker trip output
HP/IP Cylinder Excess Expansion Difference o/P trip
Trip Spare 1 output 1
Trip Spare 2 output 1
OR
gate
>=1
OR gate
>=1

14. Shaft Vibration 1 H alarm
Shaft Vibration 4 H alarm
Shaft Vibration 2 H alarm
Shaft Vibration 8 H alarm
Shaft Vibration 5 H alarm
Shaft Vibration 6 H alarm
Shaft Vibration 7 H alarm
OR gate
(>=1)
Shaft Vibration 3 HH Trip
And
gate
Shaft Vibration 1 H alarm
Shaft Vibration 3 H alarm
Shaft Vibration 2 H alarm
Shaft Vibration 8 H alarm
Shaft Vibration 5 H alarm
Shaft Vibration 6 H alarm
Shaft Vibration 7 H alarm
OR gate
(>=1)
Shaft Vibration 4 HH Trip
And
gate
3
4

15. Shaft Vibration 1 H alarm
Shaft Vibration 3 H alarm
Shaft Vibration 2 H alarm
Shaft Vibration 8 H alarm
Shaft Vibration 4 H alarm
Shaft Vibration 6 H alarm
Shaft Vibration 7 H alarm
OR gate
(>=1)
Shaft Vibration 5 HH Trip
And
gate
Shaft Vibration 1 H alarm
Shaft Vibration 3 H alarm
Shaft Vibration 2 H alarm
Shaft Vibration 8 H alarm
Shaft Vibration 4 H alarm
Shaft Vibration 5 H alarm
Shaft Vibration 7 H alarm
OR gate
(>=1)
Shaft Vibration 6 HH Trip
And
gate
5
6

16. Shaft Vibration 1 H alarm
Shaft Vibration 3 H alarm
Shaft Vibration 2 H alarm
Shaft Vibration 8 H alarm
Shaft Vibration 4 H alarm
Shaft Vibration 5 H alarm
Shaft Vibration 6 H alarm
OR gate
(>=1)
Shaft Vibration 7 HH Trip
And
gate
Shaft Vibration 1 H alarm
Shaft Vibration 3 H alarm
Shaft Vibration 2 H alarm
Shaft Vibration 7 H alarm
Shaft Vibration 4 H alarm
Shaft Vibration 5 H alarm
Shaft Vibration 6 H alarm
OR gate
(>=1)
Shaft Vibration 8 HH Trip
And
gate
7
8

17. OR gate
(>=1)
T on
1
2
3
4
5
6
7
8
mTSI TRIP
T#3000 MS