Turbine Protection & Interlock

(NTPC) / (TSTPP)4X500 MW UNITS , Stage- II OPERATION DEPARTMENT

PROTECTION & INTERLOCKS CHECKING PROTOCOLTS - II /OPN/R/P&I/TG/01

AREA : Turbine Rev 0.0 (01/01/2006)

Unit - 3 EQUIPMENT NAME : MAIN TURBINE Date Of Checking : 03-01-2006

SoNo

DescriptionLogi

cSet. Pt. Field Switches Method of

CheckingChannel acting

CRT Trip

Status

BHEL CRT

LVS alarm

SOE Point in THL CRT

1.LUB OIL PR.V.LOW Behind the Filter

2 / 3<1.2Kg/

Cm2

MAV 42 CP 016MAV 42 CP 017MAV 42 CP 018

By draining the pr.

switches in combination

Ch- 1

Ch- 2

2.AXIAL SHIFT VERY HIGH

2 / 3± 1.0 mm

MAD 11 CY 011MAD 12 CY 011MAD 13 CY 011(0-50%-100%)

Simulation DONE FROM THE Panel. 16% &84%

Ch- 1

Ch- 2

3.HP outer casing Exhaust Steam temp HI .

2 / 3500 0C

(0-600 0C)

MAA 50 CT 021MAA 50 CT 022MAA 50 CT 023

Simulation DONE FROM THE Panel.

(84% )

Ch- 1

Ch- 2

4.COND. PR. VACUUM TRIP(VSP)

2 / 3As per the

curve

- MAC 11 CP 001 + MAG 10 CP 002- MAC 11 CP 002+ MAG 10 CP 003- MAC 11 CP 003+ MAG 10 CP 004

Speed signal & LPT inlet pr. Simulation in

Panel

Ch- 1

Ch- 2

5. 2 / 3 Ch- 1

P&I Checked By Approved By

Signature: Name: R.N.Das D.Sarkar Desig: Sr. Supdt (O) DGM (O)

(Operation Dept.)


Signature: Name: A. Bhowmic A.N.Sar Desig: Supdt (C&I) DGM(C&I)

( C&I Dept.)

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SoNo

DescriptionLogi



CRT Trip

Status

BHEL CRT

LVS alarm


COND. PR. VACUUM TRIP (FSP)

> - 0.70 KSC &

turbine speed > 6.67% of 3600 RPM

MAG 10 CP 002 MAG 10 CP 003 MAG 10 CP 004

Speed simulation in Panel. & Vac

sim 30 %

Ch- 2

6.

HP CASING TOP-BOT Diff temp Very high

2 / 3

> 100 0

C&

actual load >

100 mw(16.67%

of 600MW )

MAA 50 CT 051 A/B (Top) MAA 50 CT 052 A/B (Bot)MAA 50 CT 053 A/B (Top)MAA 50 CT 054 A/B (Bot)MAA 50 CT 055 A/B (Top)MAA 50 CT 056 A/B (Bot)

By simulation from Panel

both Load & Temp points

Ch- 1

Ch- 2

7.

IP CASING TOP-BOTTOM Diff temp Very high (FRONT)

2 / 3

> 45 0 C&

actual load > 45

mw(7.5% of 600MW )

MAB 50 CT 041 A/B (Top)MAB 50 CT 042 A/B (Bot)MAB 50 CT 043 A/B (Top)MAB 50 CT 044 A/B (Bot)

Simulation in Panel

Ch- 1

Ch- 2



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SoNo

DescriptionLogi



CRT Trip

Status

BHEL CRT

LVS alarm


8.

IP CASING TOP-BOTTOM Diff temp Very high (REAR)

2 / 3

> 45 0 C&

actual load > 45

mw(7.5% of 600MW )

MAB 50 CT 061 A/B (Top)MAB 50 CT 062 A/B (Bot)MAB 50 CT 063 A/B (Top)MAB 50 CT 064 A/B (Bot)

Simulation in Panel

Ch- 1

Ch- 2

Ch- 2

9.FIRE PROT'N CHECK 1 & 2

2 / 3

1050 MM MOT level

(0-1600mm)From Top

MAV10CL021MAV10CL022MAV10CL023

FP PB AT LOCAL

By Simulating the level &

also by pressing the push button.

Ch- 1

Ch- 2

GENERATOR MECHANICAL PROTECTIONS ( Sl no 10-19)

10. LIQUID MAIN LEADS TOP

2 / 3Level >

MAXMKA 24 CL 001 MKA 24 CL 011 MKA 24 CL 021

By simulating the level

switches from local.

Ch- 1

Ch- 2



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SoNo

DescriptionLogi



CRT Trip

Status

BHEL CRT

LVS alarm


11.

SO TEMP AFT CLR AIR SIDE V. HIGH

2 / 3 > 55 0 CMKW 71 CT 001 MKW 71 CT 004 MKW 71 CT 005

By Simulating the temp. switches.

Ch- 1

Ch- 2

12.HOT AIR MAIN EXCITER V. HIGH

2 / 3 > 80 0 CMKC 09 CT 001 MKC 09 CT 004 MKC 09 CT 005

By Simulating the temp. Switches.

Ch- 1

13.COLD GAS AFT CLR A/B V. HIGH

2 / 3 > 60 0 CMKA 75 CT 001

MKA 75 CT 002AMKA 75 CT 003A

By Simulating the temp. RTDs AT LOCAL

Ch- 1

Ch- 2

14.COLD GAS AFT CLR C/D V. HIGH

2 / 3 > 60 0 CMKA 78 CT 001

MKA 78 CT 002 AMKA 78 CT 003 A

By Simulating the temp.

RTDs.

Ch- 1

Ch- 2

15. 2 / 3 < 70 % MKF 82 CF 001 A Ch- 1



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SoNo

DescriptionLogi



CRT Trip

Status

BHEL CRT

LVS alarm


STATOR WNDG. FLOW V. LOW

<48 M3/hr

MKF 82 CF 001 BMKF 82 CF 001 C

by reducing the the actual

flowCh- 2

16.PRIM WATER TEMP. AFT CLR V. HIGH

2 / 3 > 55 0 CMKF 80 CT 001 MKF 80 CT 005 MKF 80 CT 006

By Simulating the temp.

Switches AT LOCAL

Ch- 1 Ch- 2

17.FLOW MAIN BUSH 'R' V. LOW 2 / 3

< 73.88 %

<1.33 M3/hr

MKF 83 CF 001 A MKF 83 CF 001 B MKF 83 CF 001 C

By draining the flow switches in combination &

also by reducing the flow.

Ch- 1

Ch- 2

18.FLOW MAIN BUSH 'S' V. LOW

2 / 3

< 73.88 %

<1.33 M3/hr




Ch- 1

Ch- 2

19.FLOW MAIN BUSH 'T' V. LOW 2 / 3

< 73.88 %

<1.33 M3/hr




Ch- 1

Ch- 2



(Operation Dept.)



( C&I Dept.)

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SoNo

DescriptionLogi



CRT Trip

Status

BHEL CRT

LVS alarm


20.GEN PROTECTION

2 / 3

Relay 186/286 GROUP

Operated

MKY 01 EZ 000 A X 401MKY 01 EZ 000 B X 401MKY 01 EZ 000 C X 401

By simulating the concant in

GRP.

Ch- 1

Ch- 2

21. MFT 1/3

MFT took place

From FSSS

Checked by actually tripping

the boiler.

Ch- 1

Ch- 2

22.ELECTRICAL OVERSPEED

2 / 33270 RPM

(109%)Speed transmitters Speed signal

simulation

Ch- 1

Ch- 2

23.

EMERGENCY TRIP FROM THE PB PROVIDED IN TG DESK (both)

2 / 3

Both PB pressed

simultaneously

PB from TG desk

By pressing both push buttons

simultaneously

Ch- 1

Ch- 2 24. 2 / 3 PB in Vertical Panel Ch- 1



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SoNo

DescriptionLogi



CRT Trip

Status

BHEL CRT

LVS alarm


EMERGENCY TRIP from Vertical Panel in CCR

Trip from Vertical Panel

Console

By pressing the push button in vertical panel. Ch- 2

25.MANUAL TRIP from Local protection Rack

1 / 1 Pressed Local Trip PB

By operating the trip lever in

main trip device.

Mech Trip

26.Emergency Trip from VPC

1/1Pressed

from CRTCRT VPC By pressing

from CRT

Both Channe

l

N:B :- After checking all the simulations are normalized by C&I .

The interlocks are checked by observibg opeartion of TTR Ch- 1 Ch- 2 . Only once the actual operation of SV is checked in each channel .



(Operation Dept.)



( C&I Dept.)

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Turbine Protection & Interlock

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