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TURBINE PROTECTIONS
K.K.MRIDHA
Dy.Supdt.(C&I)
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Turbine Protections
GENERATOR EXCITER
1 2 34 5 6
ESV1 CV1
CRH
IPSV1 IPCV 1
FROM HRH
LPBP
HPT 1X17
IPT
2X12
LPT
2X6
Condenser
From MS
Turbine Cycle
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Turbine Protections
The two main components of machinery
management are
Monitoring
Protection
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Machinery Monitoring
The first level of Machinery Management is simply
monitoring the machinery responses.
Monitoring SystemSensors
Sensors
The goal is to acquire machinerys present health and operationalstatus.
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Machinery Management Components
The main component of machinery management is
Monitoring
Protection
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Machinery Protection
Sensors
Sensors
Protection System
Distributed Control System
Control System
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Turbine Protections Logic Philosophy
! Three channel, fail safe principle:
Trip, if more than 1-channel votes
! Triple sensors for the most important protection
! Equal trip logic in each channel
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Trip System Architecture
81AB02
(O/P CARD)
83SR03
(PROCESSOR CARD)
81EB02
(I/P CARD)
81EB02
(I/P CARD)
81EB02
(I/P CARD)
RELAY UNIT
I/Ps FROM FIELD I/Ps FROM FIELD I/Ps FROM FIELD
TripS/N240 V DC
Central Safety
System
24 V DC
Drain
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OR
(2/3)
MOT LEVEL
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Turbine Protections
from Lub. Oil Sys.
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Turbine Protections from Lub. Oil Sys.
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Turbine Protections from Lub. Oil Sys
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Turbine Protections from Lub. Oil Sys.
Sl.
No.
Description Set Point/
Remarks
Method of
checking
Field
Instruments
1 Lub oil pressure
Lo-Lo (2/3 logic)
(0-100% = 0- 2.0 KSC)
< 1.2 KSC
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Turbine Protections from Lub. Oil Sys.
MOT LevelSwitches
f O S
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Turbine Protections from Lub. Oil Sys.
T bi P t ti f L b Oil S
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Turbine Protections from Lub. Oil Sys.
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Turbine Protections
from TSI
T bi P t ti f TSI
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Turbine Protections from TSI
T bi P t ti f TSI
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Turbine Protections from TSI
T bi P t ti f TSI
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Turbine Protections from TSI
Sl.
No.
Description Set Point/
Remarks
Method of
checking
Field
Instruments
3 Axial shaft positionHi-Hi
(2/3 logic) with 10
sec. delay
+/- 0.8 mm. Through FG
Safety
Device
Proximity
Sensors
4 Any bearing shaftvibration Hi-Hi with
adjacent bearing
shaft vibration Hi
(Bearing No 1 to 6)with 05 sec. delay
140Microns- Hi-Hi
106Microns- Hi
Similar for all
bearings.
Simulation Proximity
Sensors
T bi P t ti f TSI
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Turbine Protections from TSI
Axial Shift measurement at IP collar
T bi P t ti f TSI
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MeasuringAmplifier
45O 45O
ProximityPick-up
L RSHAFT
Turbine Protections from TSI
T rbine Protections from TSI
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Turbine Protections from TSI
Shaft
Vib. Probe
Turbine Protections from TSI
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Turbine Protections from TSI
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Turbine Protections
from Bearing metal Temp.
Turbine Protections from Bearing metal Temp
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Turbine Protections from Bearing metal Temp.
Turbine Protections from Bearing metal Temp
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Turbine Protections from Bearing metal Temp.
Sl.
No.
Description Set Point/
Remarks
Method of
checking
Field
Instruments
5 Any Bearing( 1 to 6)metal temp.Hi-Hi
(2/3 logic)
>120Deg. C Limit Value
simulation
T/C
Turbine Protections from Bearing metal Temp
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Turbine Protections from Bearing metal Temp.
T/C
Turbine Protections from Bearing metal Temp
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Turbine Protections from Bearing metal Temp.
T/C
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Turbine Protections
from Seal Oil System.
Turbine Protections from Seal Oil Sys
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Turbine Protections from Seal Oil Sys.
Turbine Protections from Seal Oil Sys
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Turbine Protections from Seal Oil Sys.
Turbine Protections from Seal Oil Sys
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Sl.
No.
Description Set Point/
Remarks
Method of
checking
Field
Instruments
6 Vacuum oil tank levelLo-Lo(2/3 logic) with
10 sec. delay
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Turbine Protections from Seal Oil Sys.
Vac. Oil tank
Level Lo-Lo
Switches
Turbine Protections from Seal Oil Sys
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Turbine Protections from Seal Oil Sys.
Turbine Protections from Seal Oil Sys
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Turbine Protections from Seal Oil Sys.
Seal Oil/H2
DP Switches
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Turbine Protections
from HPT
Turbine Protections from HPT
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Turbine Protections from HPT
Sl.
No.
Description Set Point/
Remarks
Method of
checking
Field
Instruments8 HPT inner casing
Temperature Hi-Hi
(2/3 Logic)
530 Deg. C Simulation T/C
Turbine Protections from HPT
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Turbine Protections from HPT
Turbine Protections from HPT
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Turbine Protections from HPT
HPT INNER
CASING T/C
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Turbine Protections
from LPT
Turbine Protections from LPT
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Turbine Protections from LPT
Sl.
No.
Description Set Point/
Remarks
Method of
checking
Field
Instruments
9 LP inner casing metaltemp. Hi-Hi
(2/3 logic)
> 200 Deg C Simulation T/C
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Turbine Protections
from Condenser
Turbine Protections from Condenser
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Turbine Protections from Condenser
Sl.
No.
Description Set Point/
Remarks
Method of
checking
Field
Instruments
10 LP turbine exhaust
steam pr. MAX and
Gen. Field breaker Not
open (2/3 logic)
>0. 25 bar ABS
>- 0.75 KSC
Simulation Vacuum
Tranismitter
11 LP Heater-1 Level
Hi-Hi (2/3 logic)with 40 sec. delay
> + 30 mm Actual Level Switch
& Transmitter
12 Condenser Hot well
Level Hi-Hi (2/3 logic)
> 1600 mm Actual Level
Switches
13 CW supply not on At least one
CW P/Pavailable/Unit
P/P running
Contacts
Turbine Protections from Condenser
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C
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Turbine Protections
from Turbotrol
Turbine Protection from Turbotrol
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Sl.
No.
Description Set Point/ Remarks Method of
checking
Field
Instruments
14 Turbotrol tripON
TT52/TT51 H/W Fault
Turbo max trip
Position Controller HP Fault
Position Controller IP Fault
TT51 fault& TT52 not ON
Simulation
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Turbine Protections
from Boiler Trip
Turbine Protections from Boiler Trip
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Sl.
No.
Description Set Point/
Remarks
Method of
checking
Field
Instruments
15 Turbine trip on Boilertrip MFT A/ B
(inter trip)
Simulation From Logic
p
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Turbine Protections
from Generator Trip
Turbine Protections from Generator Trip
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p
Sl.
No.
Description Set Point/
Remarks
Method of
checking
Field
Instruments
16 Turbine trip onGenerator (inter trip)
Simulation From Logic
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Generator Protections
from Stator Water Sys.
Generator Protections from Stator Water Sys.
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y
Generator Protections from Stator Water Sys.
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Generator Protections from Stator Water
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Sl.
No.
Description Set Point/
Remarks
Method of
checking
Field
Instru.
17 Generator term. Box Leaklevel Hi-Hi
(2/3 logic)
By simulationat switch end.
LevelSwitches
18 Generator stator CW flow
Lo-Lo (2/3 logic) with 10 sec.
delay.
< 47. 00
CuMtr/hr
Actual Level
Switches
19 Generator stator CW
conductivity Hi-Hi
(2/3 logic) with 5 sec. delay.
> 8.00
Micro S/cm
By simulation
at switch end.
Conducti
vity
Probes
20 Generator stator CW O/L
temp. Hi-Hi(2/3 logic)
> 90 Deg.C By simulation
at switch end.
Temp
Switch
21 Stator CW Compensating
tank Level LO-LO
(2/3 Logic) with 5 Sec.delay
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Leak Level
Detector
Generator Protections from Stator Water Sys.
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LO-LO
Flow
Switch
Generator Protections from Stator Water Sys.
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Conductivity
measuring Probe
Generator Protections from Stator Water Sys.
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Comp. tank
Level Lo-Lo
Switches
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Generator Protections
from Warm Gas
Generator Protections from Warm Gas
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Generator Protections from Warm Gas
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Sl.
No.
Description Set Point/
Remarks
Method of
checking
Field
Instruments22 Generator LFT/RGT
warm gas temp. very
high (2/4 logic)
> 105 Deg.C Simulation Temp
Switch
Generator Protections from Warm Gas
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Temp.
Switch
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Generator Protections
from 400 KV Breaker
Generator Protections from 400KV Breaker
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Sl.No.
Description Set Point/Remarks
Method ofchecking
FieldInstruments
23 Both 400 KV BreakerOpen
This trip will be
armed only
after GCB is
closed & any400 KV breaker
is closed.
Generator Protections from 400KV Breaker
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Turbine Protections
from Push Button
Turbine Protections from Push Button
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Sl.
No.
Description Set Point/
Remarks
Method of
checking
Field
Instruments
23 Remote trip from UCBPB Actual PushButton
24 Emergency trip fromlocal PB on Gov rack
Actual Push
Button
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Turbine Protections
from Over Speed
Turbine Protections from Over Speed
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Sl.
No.
Description Set Point/
Remarks
Method of
checking
Field
Instruments25 Turbine Electrical
Over Speed Trip
109%
3270 RPM
Lowering the
Limit value
From Trip Logic
26 Turbine Mechanical
Over Speed Trip
110% i.e.
3300 RPM
112% i.e.
3360 RPM
Oil Injection
Test orIncreasing the
Actual speed
Trip from
Trip Bolt
Turbine Protections from Over Speed
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Trip
Bolts
Turbine Protections from Over Speed
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Thank You