Power Plant Emergency

7/29/2019 Power Plant Emergency

1/22

POWER PLANT EMERGENCY

Every power plant generation unit or station tried to supply quality and reliable

power to grid or customer. So after commercialization of unit, the operation engineersresponsibility increased manifold not only providing the quality and reliable power

supply but also safety of all running equipments and unit.

Operation engineers familiarized with problems and emergencies. Familiarization of all

emergency is needed, some problems can be solved easily without losing generation.

But some unforeseen incidents occurred in power plant. It requires immediateappropriate action to solve problem to avoid any generation loss or any damage to

equipment.

So, there are different type of emergencies

1. Boiler emergencies

2. Turbine emergencies3. Generator emergencies

4. Electrical emergencies ( SWGR)

5. Grid failure.

6. Unit emergencies


2/22

Unit emergencies:-

1. CW P/Ps tripped

2. Compressor tripped

3. Heavy lkg in DM make up line

4. Any major fire in oil system of TDBFP /Main TG etc

5. Failure of work station

6. Loss of 220 V DC

7. Loss of 24V TG8. Loss of 24V SG

9. UPS failure

10. 11 KV SWGR dead

11. 3.3 KV SWGR dead

12. USS/Unit Emergency SWGR dead


3/22

CW P/P tripped

Unit/ Station condition

All units running with 500 MW4 CW P/Ps are running

I/C V/Vs are opened

Case-1 : One CW P/P tripped

Consequence:-

suction pressure low to ACW P/P

Low flow through Condenser Pass-A/B

Temp may rise of TG PHE O/L results increasing oil/Brg temp, seal oil temp,

Action:

Start stand by pump immediately

Observe all parameters


4/22

Case-2 : One CW P/P tripped and stand by p/p failed to start CW P/P-3B/3C tripped due to dead of 3UB busCW P/P-3B/3C tripped due to dead of 3UB bus and another p/p fails to startor under PTW

Consequence:-

Suction pressure low to ACW P/P

Low flow through Condenser Pass-A/B

Temp may rise of TG PHE O/L results increasing oil/Brg temp, seal oil temp,

Action:

Start stand by CW P/P

Reduce unit load around 300 MW

Observe condenser vacuum and all Brg and oil temp

If necessary, throttled TGPHE ACW side v/v to avoid ACW P/P tripping

If tripping of any unit due to temp like seal oil or PW etc, Close the


5/22

DM Water System


All units running with 500 MW

Avg make up around 25-30 T/H to hot well

ECW tank make lined from DM

Normal/emergency make up lined up

Case-1Leakage in DM header ( DM make up system isolation required)

Consequence:

Hindrance to DM make up to units wastage of DM water

Action:

Take DM water make up to ECW O/H tank in all units

Take up make up in Hotwell and DA and maintain above normal level

Start emergency make up system and check /ensure flow to Hotwell

Isolate all units of Hotwell normal make V/v tp avoid air ingress

Stop soot blowing of all units for that time

Inform chemsitry SCE for not taking DM for CPU regenartion


6/22

Compressor- Instrument air system


All units running with 500 MW

All Compressors are running

I/C V/Vs are opened 10% at stage one end and full opened at stage-II end.

Power Source of Compressor- Unit-3 (IAC-1,3,5, PAC-1)Unit-4( IAC-2,PAC-4)

Unit-5( IAC-4,PAC-3,5)

Unit-6( PAC-2,6)

Cooling water sources:- IAC-1-5 and PAC-1-4 from all units

and IAC-1-5 and PAC-1-4 from unit-5/6 ( stand by)

PAC-5,6 from unit 5 and 6


7/22

Case-1

Few IAC tripped due to some protection leads to maintain low header pressure

Consequence:


8/22

SL.NO NTPC TAG SERVICE ACTION

1CD-67 COND SPRAY TO HDFT MODULATING

SD-62 BCW LP DRAI MANIF DRAIN V/V ON/OFF

2DR-18 HPH-5A DRAIN TO HPFT CV

MODULATING

AIR TO CLOSE

3DR-25 HPH-5B DRAIN TO HPFT CV

AIR TO CLOSE



6DR-31 LPH-3 DRAIN TO LPFT C/V

7DM-1 DM N M UP TO HOTWELL C/V

8DR-15 HPH-5A DRAIN TO D/A CV

MODULATING

AIR TO OPEN

9DR-22 HPH-5B DRAIN TO D/A CV

AIR TO OPEN

10DR-28 LPH-3 DRAIN TO LPH-2 C/V

11DMCW-90 ECW PUMP(SG) I/O HDR DP C/V

AIR TO OPEN

12SD-61 BCW ECW LINE INLETV/V

ON/OFFAIR TO OPEN

13SD-62 BCW LP DRAI MANIF DRAIN V/V

AIR TO OPEN

14DR-37 LPH-2 DRAIN TO LPFT C/V MODULATING

AIR TO CLOSE

15DR-48 D/A OVERFLOW LPDFT ON/OFF

AIR TO CLOSE

16CD-10 CEP-A M/N R/C C/V

MODULATING

17CD-12 CEP-B M/N R/C C/V

18CD-14 CEP-C M/N R/C C/V

AIR TO CLOSE

19CD-39 GSC M/N R/C C/V

20CD-43 HOTWELL SPILL LVL C/V

AIR TO CLOSE

21DR-2 HPH-6A DRAIN TO HPH-5A CV

MODULATING22

DR-8 HPH-6B DRAIN TO HPH-5B CV


AIR TO OPEN

24DM-2 DM E M UP TO HOTWELL C/V

AIR TO OPEN

25SD45 SH SPRAY C/V LEFT

MODULATING

Air to Open

26

SD44 SH SPRAY C/V LEFT

Air to Open

27SD46 SH SPRAY C/V RIGHT

Air to Open


Air to Open

33AS-8 AUX STEAM TO D/A C/V MODULATING

29FD14 LOW LOAD FEED C/V MODULATING

30CD-22 D/A LVL C/V MAIN

MODULATING

Air to Open

31CD-25 D/A LVL C/V STANDBY

Air to Open

32DMCW-100 ECW PUMP(TG) I/O HDR DP C/V

Air to Open

34CRH-6 CRH STEAM TO D/A C/V MODULATING

Air to Open

35CD-72 GLAND SEALING C/V MODULATING

36SD-43 SH SPRAY BLOCK V/V ON/OFF Air to Open

SD-48 RH SPRAY BLOCK V/VON/OFF


9/22

An emergency power system/ stand by is anindependent power generation system that is

legally required to feed equipment or systems

whose failure may present a life safety hazard

to persons or property.


10/22

FAILURE OF UPS

AC

( Inverter)

LOAD

AC(Inverter)

DC(Rectifier)

DC(Rectifier)

AC supply ,USSAC supplyEMCC

Bypass AC supplyUSS

Bypass AC supplyEMCC

Battery Bank


11/22

ACPDB-01 (CCR)

ACPDB-02 (CCR)

ACPDB-03 (PRGMR ROOM)

ACPDB-04(UCP)

ACPDB-05 C&I-MAINT

ACPDB-06 CHIMNEY

BHEL PDB-1 MTM

BHEL PDB-2 MTM

BHEL PDB-4 AIR HEATER

SWAS

PA SYS 01

PA SYS 02

VMS-CER

MASTER CLOCK CER

ACPDB-11 BNKR LVL

PAH-A AIR MOTOR BMCC

PAH-B AIR MOTOR BMCC 3.3R 2.2R

SAH-A AIR MOTOR BMCC 2.4R

SAH-B AIR MOTOR BMCC 4.3R

VMS-II CER

SG/TG MMI WS POSE CAB

BOILER FLAME SENSING SYSTEM

ACCOUSTIC PYROMETER

BLR MAIN WORK STATION

BPOS

VIB ANALYSER

GCC02 SEAL OIL ISNT CAB

GCC03 STATOR WATER INST. CAB


12/22

STATOR END WNDG VIB SYS

VFD C&I PANEL ID-A

VFD C&I PANEL ID-B

TUBE LIFE ASSESMENT SYSTEM

CJJ13 MARSHELLING PANEL

TSI FOR BFPDT 1&2

TSC PC & PRNTR.

GAS ANALYSE

PDB FOR APRDS CJCB

PARTIAL DISCH. MONITORING

MDBFP SCOOP KE3

ACPDB-19 BRNR TILT

ACPDB-21 HPH LVL SW

ACPDB-22 LPH LVL SW

ACPDB-23 D/A LVL SW

ACPDB-24 HOTWELL LVL SW

BHEL PDB-3 BCW P/P

CWPNL VMS

FLAME SCANER CJF-07

VAC. P/P -1

SMART ACT. STN (U#3 ONLY)

MILL A TO E LVL SW ACPDB

MILL F TO K LVL SW ACPDB

MILL REJECT SYSTEM


13/22

Case-1

In case of any one channel failed to supply power, supply will getextend from the other source and alarm will come. No problem is

envisaged.

In case of both channel failed to supply, then direct sources (

unregulated 415V AC Power) comes in service, no immediate

problem will occur but regular supply has to be restored as soon aspossible.


14/22

Case-2

If there is total failure of power supply from UPS, the following events will happen

All BFP will get trip on D/A level-Low since supply of DA Lvl switch from UPS

Boiler will trip on All BFP OFF from FSSS ( SG 24V source)

Turbine will trip on MFT of boiler and generator will trip on Low Forward Power

ID fans will trip due to loss of supply from UPS to VFD, FD fans will trip on interlock

Mills and PA fan will trip on MFT

No command will be executed from MMI and parameters will not be available for

BHEL CRT, For DDCMIS, HMI/LVS screens will be available for 30 mins

Vertical panels will be available for operation.

Turbine lube oil pumps. Seal oil pumps, barring gear will be available

HP/Lp bypass will be available for operation

TSI parameters will not available.


15/22

Action

Ensure by checking at local, Main TG, TDBFP lube oil pumps, seal oil

pumps, air pre heater motors, scanner air fans etc are in service. And check

barring gear v/v opened.

Inform C & I and EMD ( battery and Charger group) for

rectification.SCE/DGM/AGM(O)


16/22


17/22

FIRE NEAR TG ON ACCOUNT OF OIL LEAKAGE

OR FIRE IN LUBE OIL SYSTEM/TDBFP/MAIN TG

CASUE

Oil lkg in pipe line, bearing etc

Wet cotton which was used for cleaning purpose filter or bearing

Above these, high temp of steam lkg and contact with bared high

temp steam line.


18/22

ACTION

Oil fire spread very fast, so that

machine should be stopped

immediately

Oil supply should be cut off, DC oil

pump should kept off.

Steam supply should be cut off.Incase of towards , Main TG

trip main TG, H2 purged out.

Extinguish fire with help of available

of fire extinguisher

Inform to fire station

Inform HOD of OPRN/EMD/TMD

Revise DC


19/22

Fire protection-1

Generator breaker OFF andEither MOT Lvl V Low or Fire protection

PB(1/2) pressed

Casue

Opens the vacuum breaker on protection

Stops the HPCF pumpsStops HPCF heater

Stops HPCF recirculation pumps

Trips the turbine


20/22

Fire protection-2

Either MOT Lvl V Low or Fire protection

PB(2) pressed

Cause

Switch off the SGC oil supply program

Stops AOP-1 on protection

Auto off SLC AOP-1

Stops AOP-2 on protection

Auto OFF SLC AOP-2

Auto On SLC EOPAuto OFF SLC jOPs

Stops JOP-1 on protection

Stops JOP-2 on protection

Starts JOP-3 on protection

Auto OFF SLC JOP-3

Auto OFF SLC turning gearTrips the turbine

Opens the vacuum breaker on protection

Stops the HPCF pumps

Stops HPCF heater

Stops HPCF recirculation pumps

Trips the turbine


21/22


22/22

SL.NO NTPC TAG SERVICE ACTION

1CD-67 COND SPRAY TO HDFT MODULATING

SD-62 BCW LP DRAI MANIF DRAIN V/V ON/OFF


MODULATING

AIR TO CLOSE


AIR TO CLOSE



6DR-31 LPH-3 DRAIN TO LPFT C/V

7DM-1 DM N M UP TO HOTWELL C/V

8DR-15 HPH-5A DRAIN TO D/A CV

MODULATING

AIR TO OPEN

9DR-22 HPH-5B DRAIN TO D/A CV

AIR TO OPEN


11DMCW-90 ECW PUMP(SG) I/O HDR DP C/V

AIR TO OPEN

12SD-61 BCW ECW LINE INLETV/V

ON/OFFAIR TO OPEN

13SD-62 BCW LP DRAI MANIF DRAIN V/V

AIR TO OPEN

14DR-37 LPH-2 DRAIN TO LPFT C/V MODULATING

AIR TO CLOSE

15DR-48 D/A OVERFLOW LPDFT ON/OFF

AIR TO CLOSE

16CD-10 CEP-A M/N R/C C/V

MODULATING

17CD-12 CEP-B M/N R/C C/V

18CD-14 CEP-C M/N R/C C/V

AIR TO CLOSE

19CD-39 GSC M/N R/C C/V

20CD-43 HOTWELL SPILL LVL C/V

AIR TO CLOSE

21DR-2 HPH-6A DRAIN TO HPH-5A CV

MODULATING22

DR-8 HPH-6B DRAIN TO HPH-5B CV


AIR TO OPEN

24DM-2 DM E M UP TO HOTWELL C/V

AIR TO OPEN


MODULATING

Air to Open


Air to Open


Air to Open


Air to Open

33AS-8 AUX STEAM TO D/A C/V MODULATING

29FD14 LOW LOAD FEED C/V MODULATING

30CD-22 D/A LVL C/V MAIN

MODULATING

Air to Open

31CD-25 D/A LVL C/V STANDBY

Air to Open

32DMCW-100 ECW PUMP(TG) I/O HDR DP C/V

Air to Open

34CRH-6 CRH STEAM TO D/A C/V MODULATING

Air to Open

35CD-72 GLAND SEALING C/V MODULATING

36

SD-43 SH SPRAY BLOCK V/V ON/OFF

Air to OpenSD-48 RH SPRAY BLOCK V/V

ON/OFF

Power Plant Emergency

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