turbine-protections.pdf

8/18/2019 Turbine-Protections.pdf

1/8


2/8

2

TURBINE PROTECTIONS

LUB OIL PRESSURE LOW

HIGH AXIAL SHIFT

LOW VACUUM

HP EXHAUST TEMP HIGH

HPC TOP-BOTTOM DIFF TEMP HIGH

IPC FRONT TOP-BOTTOM DIFF TEMP HIGH

IPC REAR TOP-BOTTOM DIFF TEMP HIGH

FIRE PROTECTION

MFT

ATRS TRIP

GENERATOR TRIP LEADING TO TURBINE TRIP

TURBINE PROTECTIONS

LIQUID MAIN LEADS TOP HIGH

COLD GAS COOLERS TEMP A&B HIGH

COLD GAS COOLERS TEMP C&D HIGH

SEAL OIL TEMP AFTER COOLER AIR SIDE HIGH

HOT AIR MAIN EXCITER TEMP HIGH

PRIMARY WATER TEMP AFTER COOLER HIGH

STATOR WINDING FLOW LOW

MAIN BUSHING R FLOW LOW

MAIN BUSHING S FLOW LOW

MAIN BUSHING T FLOW LOW


3/8

3

ELECTRICAL

TRIP

CONDITIONS

ELECTRICAL

TRIP

CONDITIONS

TRIP

RELAY 1

TRIP

RELAY 1

TRIP

SOLENOID 1

TRIP

SOLENOID 2

TURBINE

TRIP VALVE

STOP

VALVE

HYDRAULIC

TRIPDEVICES


4/8

4

ABSOLUTE EXPANSION

RELATIVE EXPANSION

RELATIVE SHAFT VIBRATION

ABSOLUTE BRG VIBRATION

ABSOLUTE EXPANSION

AXIAL SHAFT POSITION



RELATIVE

EXPANSION

ECCENTRICITY

ABSOLUTE BRG

VIBRATION

RELATIVE EXPANSION



TURBINE PROTECTIONS

• Two trip solenoids are provided in the hydraulic

circuit, which get trip signals from the electrical

system. Actuation of any one solenoid is sufficient

to trip the turbine.

• The electrical system is configured as a 2-channel

system. Each channel is realized in a Processing

Unit

• Both the processor units are completely

independent of each other and input modules,

processor module and output modules reside on

each.


5/8

5

TURBINE PROTECTIONS

Each channel having two processors Unit

with one processor in hot standby mode .

Realisation of 2 out of 3 trip logic is carried

out in the processor.

Both the channels are tested periodically evenwhile the turbine is running. Cyclic testing is

done automatically at preset intervals

CONDENSER PRESSURE

PROTECTION

Two types of condenser pressure protection ,

one with fixed set point (FSP) and one with

variable set point (VSP), are provided.

The task of condenser pressure protection isto protect the condenser against a non

permissible pressure increase and the

deterioration of vacuum.

Trip circuit is enabled only, if the turbine

speed is more than 240 RPM.


6/8


7/8

7

ISOLATION OF GENERATOR FROM GRID

Turbine has tripped and reverse power relay

has operated. The command signal shall be

initiated with a delay of 3 Seconds

Reverse power relay has operated. The

command signal shall be initiated with a time

delay of 10 seconds.

GOVERNING RACK


8/8

8

GOVERNING RACK

turbine-protections.pdf

Documents