2.Emergency Trip System

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Emergency Trip System

General

Emergency Trip Control BlockTest Blocks

Electrical Overspeed TripRelay Logic



Emergency Trip System

Power Supply

Emergency Trip Test Panel Testing



General Protection

Turbine overspeed(3300rpm)

Low Vacuum(100Kpa abs)Low EH fluid pressure(9.3Mpa)

Lube Oil Press. Low(0.034-

0.048Mpa)HP Exhaust Temp. high(427℃)



General Trip Signals

HP Exhaust Pressure High(0.828Mpa)

Rotor Position High(1.0mm)

HP Pressure Ratio Low(<1.7 1min later)

Boiler MFT Trip (RM)

DEH Loss PowerVibration High(>254um)

Generator Protection



General Trip Signals

Bearing Temp High(113℃)

DEH Protection

Manual Trip

Remote Trip



Overview

Figure 1

THRUST BEARING

TRIP 2

AUTO STOP 2

S

S

ELECTRONIC AND

ELECTRICAL BOX

220VAC#1

（SEE NOTE 1）

2 WAY SOLENOLD

VALVE-NORMALLY CLOSERD

PRESSURE SWITCH

2 WAY SOLENOLD

VALVE-NORMALLY OPEN

LEGEND

S

S

TSI TURBINE SUFERYISORY

INSTRUNTS

S

EMERGENCY TRIP CONTROL BLOCK

20-3AST

AUTO STOP PILOT

LOW BEARING OIL

LP

PU

RP

OS

LBO

ASP

LOW EH FLUID PRESS

OVERSPEED

LOW VACUUM

PICKUP

ROTOR POSITIONAUTO STOP TRIP

TRIP ALARM OUTPUTS

PURCH'S REMORTTURB TRIP #1

AUTO STOP 1

20-1AST

ASP63-1

S

OPERATOR'S PANEL

(CONTROL ROOM)

TEST BLOCKS

LV63-3

LV63-1

LVT20-1

TEST

S

63-3LBO

LBO63-1

S

TEST

20-1LBOT

LP63-3

LP63-1

LPT20-1

TEST

S

ROTOR

OVERSPEED

TRIP

PU/OS1 PU/OS3

THRUST BEARING

TRIP 1

TSI ROTOR POSALARM 1 THRUST

BRC TRIP 1#

PU/OS2

ROTOR POSITION

PICKUP

PU

PURP4

RP3

GOV

220VAC#2

（SEE NOTE 1）

NOTES

1 BOTH TRIP CHANELS ARE POWERED FROM EITHER OF THE

TWO 220 VAC POWER INPUTS.

2 ALL SENSORS AND/OR PICKUPS ARE TESTED FROM

OPERATORS PANEL

AST20-4

REMOTE TRIP

RESERT(LATCH)AT DEH OPERATOR'S

PANEL

AST20-2

ASP63-2

PURCH'S REMORT

TURB TRIP #2

EH FLUID1

20-2

63-4

63-2

TEST BLOCKS

BEARINGOIL 1

CONDENSER

VACUUM

20-2

LBO63-2

63-4LBO

LBOT

63-4LP

63-2LP

TEST

20-2LPT

S

LV

LV

TEST

S

LVTTEST

S

CONDENSER

VACUUM BEARINGOIL 1

EH FLUID1

(SEE NOTE2)

AST-LV-

TBS1 TBS2

RP1PU

RP2PU

TSI ROTOR POSALARM 2 THRUST

BRC TRIP 2#



Emergency Trip Control

Block(Figure 2)

20/AST SOLENOID VALVE SCHEMATICEMERGENCY TRIP CONTROL BLOCK

AUTO STOP 1 AUTO STOP 2

20-1

20-3

S

OPC63

S

20-2OPC

ASTS

20-1

S

OPC

ASTS20-2

ASPASP

63-263-1ASTS20-4

AST

MECHANICAL OVERSPEED ANDMANUAL TRIP HEADER

AST

OPC

HP

DV

Figure 2



Test Blocks(Figure 3)

LBO

63-1

63-3

LBO

LBO20-1

S

LBO63-4

63-2LBO

20-2S LBO

GA4354 GA4355

BEARING OIL

TSET BLOCKS

FIGURE 3



Electrical Overspeed

OS11TOS1 OS31

OS21

OS11

OS31

OS21

K1X

OST2

OS22

OS12

OS32

OS32

OST1

OS12 OS22

OS21

OS11 OS31

OST3

K1X

OST4

OS-1

S1

OST(1) OST(4)OST(2) OST(3)

S2

NOTE:1.The S1-S2 contacts are closed in normaloperation.The S1 contact opens when channel 2 istested. The S2 contact opens when channel 1 istested.

2.Relays OST(1-4) are de-energized in normaloperation.Relays OST2 and OST4 are energized when theshaft speed exceeds 110% rating shaft speed. relayOST1 is energized when the shaft speed exceeds 114%rating shaft speed.Contacts from these relays causeboth auto stop channels to trip. relay OST3 is

energized when the speed channel is being tested.3.Contact of K1X relay opens during the mechanical

overspeed operation of the turbine generator when theOverspeed trip keyswitch is turn to the INHIBITposition. The contact closes in normal operation whenthe Overspeed trip keyswitch is turn to the INSERVICE position.4.The normally close contact from TOS1 relay closes

in normal operation. The contact opens when channel 1is tested.5.Contacts of OS11,OS21 and OS31 relays close when

the shaft speed exceeds 110% rating shaftspeed.Contact OS12,OS22 and OS32 relays close whenthe shaft speed exceeds 110% rating shaft speed.6.The coils of relays OS-1 and OS-2 will be

de-energized if two contacts of three overspeedrelays close.

OS-2 OS-2

Figure 5

110VDC

COM

overspeed



Relay Logic

A. Trip Relay Logic

B. Trip Control Relay Logic



A. Trip Relay Logic(Fig6)

110VAC NO.1

AUTOSTOP TRIP CHANNELS

AST CHANNEL 1

110VAC NO.2

AST CHANNEL 2

1A

Figure 6

1B

20-1

AST20-3

AST

20-2

AST20-4

AST

1A

1B

1A

1BLATCH

LP1

LBO1

LV1

OS1

TB1

REM1

1A 1B 2A 2B

LATCH RESET

TEST

TRIPS

LATCH

LATCH2B

2A

REM2

TB2

OS2

LV2

LBO2

LP2

2A

2B 2B

2A



B. Trip Control Relay

LogicLow Bearing Oil, Low Vacuum

and Low EH Fluid PressurePurchaser’s Remote Turbine

Trip



Lube oil Pressure Low

1X

LBO

63-1

LBO

3X

LBO

63-3

LBO

LBO-1

LBO

1X

3X

LBO LBO

LBO-2

2X

4X

LBO

S1 S2

2X

LBO

63-2

LBO

4X

LBO

63-4

LBO

CHANNEL #1 CHANNEL #2

LOW BEARING OIL CONTROL RELAY LOGIC

110VDC

COM

Figure 4



Rotor Position

Each Rotor Position from TSI trigger,The Turbine will trip immediately.



Remote Trip



Emergency Trip Test

PanelMonitor Lights

PWR Supp (Power Supply)LP (Low EH Fluid Pressure)

LBO (Low Bearing Oil Pressure)

andLV (Low Condenser Vacuum)



Emergency Trip Test

PanelTest AS #1 and AS #2 Trip AS

#1 and AS #2Selector Switches

Push Buttons

Overspeed Trip Keyswitch



Test Panel

Enter Test Mode

Choose signal

Pick up channelActive test

Reset



Push Buttons

Lamp Test

Test TripsReset Test Trips



I n

p u t p

an el

Monitoring the Input signals online,

Display the turbine trip’s function.



First trip

Display the first signal tripped the turbine.Reset by the signal Turbine Latched.Note: the signal’s coming will not display here if turbine tripped already

F i s t t r i p

p a n

e l

2.Emergency Trip System

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