Turbine Protections.ppt

7/27/2019 Turbine Protections.ppt

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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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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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MOT LevelSwitches

f O S


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T bi P t ti f L b Oil S


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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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T bi P t ti f TSI


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Sl.

No.


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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Axial Shift measurement at IP collar

T bi P t ti f TSI


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MeasuringAmplifier

45O 45O

ProximityPick-up

L RSHAFT


T rbine Protections from TSI


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Shaft

Vib. Probe



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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.



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Sl.

No.


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



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T/C



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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.



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Sl.

No.


Remarks

Method of

checking

Field

Instruments

6 Vacuum oil tank levelLo-Lo(2/3 logic) with

10 sec. delay


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Vac. Oil tank

Level Lo-Lo

Switches



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Seal Oil/H2

DP Switches


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Turbine Protections

from HPT

Turbine Protections from HPT


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Sl.

No.


Remarks

Method of

checking

Field

Instruments8 HPT inner casing

Temperature Hi-Hi

(2/3 Logic)

530 Deg. C Simulation T/C



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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.


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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Sl.

No.


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



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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.


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.


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



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Generator Protections from Stator Water


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Sl.

No.


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



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LO-LO

Flow

Switch



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Conductivity

measuring Probe



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Comp. tank

Level Lo-Lo

Switches


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from Warm Gas

Generator Protections from Warm Gas


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Sl.

No.


Remarks

Method of

checking

Field

Instruments22 Generator LFT/RGT

warm gas temp. very

high (2/4 logic)

> 105 Deg.C Simulation Temp

Switch



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Temp.

Switch


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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.


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.


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



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Trip

Bolts



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Thank You

Date post:	14-Apr-2018
Category:	Documents
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Turbine Protections.ppt

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