““SEMINAR ON GOVERNING SYSTEM SEMINAR ON GOVERNING SYSTEM OF 210MW KWU TURBINE”OF 210MW KWU TURBINE”

KUNAL U .TEMBHAREKUNAL U .TEMBHARE

JUNIOR ENGINEER (GEN)JUNIOR ENGINEER (GEN)

Introduction:-Introduction:- To govern means to control and regulate certain parameters to achieve expected functional requirements. Governing system can, therefore be preliminary defined as the system designed to achieve functional requirement of turbo-generator operation by controlling and regulating steam turbine input parameters viz. turbine inlet pressure of steam, mass flow rate of steam etc.

Methods of governing:-Methods of governing:- Generally for utility steam turbines following two methods are popularly used:-1] Nozzle governing-

2] Throttle governing-

Functions of governing system:-Functions of governing system:-

1] To modulate the control valves to adjust the steam flow as per the load, keeping speed constant.

2] Control of turbine speed at no load to permit the unit to be synchronized to the grid.

3] Control of the turbine load when running in parallel with other generating sets. 4] Protective gears to ensure safe operation of the turbine under all conditions.

5] Must have facility to test the protective devices.

Governing system of 210MW KWU unit:-Governing system of 210MW KWU unit:-

The turbine of 210MW KWU unit is equipped with electro-hydraulic governing system to facilitate the operation of the turbo –set in inter- connected grid system. The electrical measuring and processing of signal offer the advantage such as flexibility, dynamic stability and simple relationship of complicated functional relationship.

Structure of electro-hydraulic control Structure of electro-hydraulic control system:-system:-

Structure of electro-hydraulic Structure of electro-hydraulic

controller:controller: • The structure of electro- hydraulic controller is comprises of

following sub-control loops:• 1] Speed control loop.• 2] Load control loop• 3] Pressure control loop.• 4] Selection circuit (control mode selection).• 5] Admission control loop (position controller).

Electro-hydraulic controller block Electro-hydraulic controller block diagramdiagram

S.No Name of Oil Source & pressure Purpose Colour Code1. Control Oil MOP/AOP ( 7-8.5 Kg/cm2) To establish Trip Oil, Aux

Trip Oil, Trip Oil, Start-up Oil, Aux Start-up Oil, Aux Secondary Oil, Secondary

Oil, Primary Oil, Etc2.

Trip OilMain Trip Valve (4.8-6

Kg/cm2)To reset , Open & Trip

stop valve

3. Aux Trip Oil

Main Trip Valve (4.8-6 Kg/cm2)

To trip Hydraulic Trip Device

4. Start-up Oil

Starting Device ( 5.5 Kg/cm2)

To assist Resetting & Opening Stop Valves

5. Aux Start-up Oil

Starting Device ( 5.5 Kg/cm2)

To Reset Main Trip Valve & Hydraulic Trip Device

6. Aux Secondary Oil

Speeder Gear ( 2.3-4.8 Kg/cm2)

Input Signal to Hydraulic Converter

7. Secondary Oil (HP/IP)

Hyd/Electro-Hyd Converter ( 0-6 Kg/cm2)

To govern HP/IP Control Valve opening

8.Primary Oil

Primary Oil Pump ( 0-2.3 Kg/cm2)

Feedback speed signal for HG

9.Test Oil

Over Speed Test Device ( 2.0 Kg/cm2)

To test Over Speed Test Device

10. Drains

Different oils, their colour codes, sources and purpose in KWU Governing System

AOP

MOP

AOP Discharge header

Filtered Control Oil

Remote Trip Solenoid Valves

Main Trip Valves

Hyd. Trip Device

TEST V/V STOP V/VSERVO MOTOR

STOP & CONTROL VALVE

CONTROL VALVE SERVO MOTOR

Hyd

C

onverter

Electro-H

yd

Con

verter

Starting

Device

Secondary Oil

Tri

p O

il

Aux Start-up Oil

Start-up Oil

Au

x T

rip

O

il

Filtered Controlled Oil

Filter

BLOCK DIAGRAM OF GOVERNING SYSTEMBLOCK DIAGRAM OF GOVERNING SYSTEM

TO TEST V/V OF STOP V/V

TO MTV & HTD V/V

CONTROL OIL FROM AOP/MOP

STARTING DEVICE

STARTING DEVICE

BRINGING THE STARTING DEVICE TO “0” POSITION TO BUILD START-UP & AUX STATR-UP OIL TO RESET STOP&

MAIN TRIP VALVES AND HYD. TRIP DEVICE

Aux Start-up Oil (5.5 Kg/cm2)

Start-up Oil (5.5 Kg/cm2)

RAISING STARTING DEVICE POSITION TO DE-PRESSURISE START-UP & AUX STATR-UP OIL TO OPEN STOP VALVES AND PRODUCING AUX SECONDARY OIL

75 100

25

50

0

Starting Device

In %

Position at MCR

Drain

Drain

Hand Wheel

Motor

Start-up Oil (0 Kg/cm2)

Aux Start-up Oil (0 Kg/cm2)

STARTING DEVICE

REMOTE TRIP SOLENOID OPERATED VALVES

TRIP OIL TO HOLD STOP V/V’S & AND TO

PRODUCE SECONDARY OIL

AUX TRIP OIL TO HYDRAULIC TRIPING

DEVICES

CONTROL OIL FROM AOP/MOP

AUX START-UP OIL TO

RESET MTV & HTD

FilterDRAIN

AOP Disharge

header

AOP/ MOP

RESETTING OF MTV

REMOTE TRIP SOLENOID OPERATED VALVES

TRIP OIL TO HOLD STOP V/V’S & AND TO

PRODUCE SECONDARY OIL

AUX TRIP OIL TO HYDRAULIC TRIPING

DEVICES

TRIPPING OF MTV THROUGH RTSV (ELECTRICAL)

CONTROL OIL FROM AOP/MOP

AUX START-UP OIL TO

RESET MTV

FilterDRAIN

TRIPPING THROUGH RTSV

AUX TRIP OIL TO THE HYDRAULIC TRIPING DEVICES

AUX START-UP OIL TO

RESET MTV

HYDRAULIC TRIP DEVICE

REMOTE TRIP SOLENOID OPERATED VALVES

TRIP OIL TO HOLD STOP V/V’S & AND TO

PRODUCE SECONDARY OIL

AUX TRIP OIL TO HYDRAULIC TRIPING

DEVICES

TRIPPING OF MTV THROUGH HYDRAULIC TRIP DEVICE

(MECHANICAL)

CONTROL OIL FROM AOP/MOP

FilterDRAIN

AUX START-UP OIL TO RESET HYD TRIP DEVICES

TRIPPING THROUGH HYD TRIPDEVICE

AUX TRIP OIL TO THE HYDRAULIC TRIPING DEVICES

AUX START-UP OIL TO

RESET MTV

HYDRAULIC TRIP DEVICE

REMOTE TRIP SOLENOID OPERATED VALVES

TRIP OIL TO HOLD STOP V/V’S & AND TO

PRODUCE SECONDARY OIL

AUX START-UP OIL TO RESET

HYDRAULIC TRIP DEVICES

RESETTING OF RTSV, HYD. TRIP DEVICES & MTV THROUGH

CONTROL OIL FROM AOP/MOP

FilterDRAIN

RESETTING OF RTSV, HYD. TRIP DEVICES & MTV THROUGH

RESETTING OF RTSV(DE-ENERGIZING)

& HYD. TRIP DEVICES & MTV THROUGH STARTING DEVICE AT “0”

POSITION

FilterDRAIN

STOP VALVE

OPENING OF STOP VALVES BY RAISING STARTING DEVICE

START-UP OIL TO TEST V/V

TRIP OIL TO STOP V/V

STOP VALVE SERVO-MOTOR

HYD TRIP DEVICE

DRAIN

AUX TRIP OIL TO HYD TRIP DEVICE

AUX TRIP OIL TO HYD TRIP DEVICE

AUX START-UP OIL TO HYD TRIP DEVICE

AU

X S

TA

RT

-UP

OIL

T

O M

TV

MTV

S/D

RTSV’S

TEST VALVE

STOP V/V OPERATION

STOP VALVE SERVO-MOTOR

SPRING

CYLINDER

SPRING DISC

PISTON

PISTON DISC

TRIP OIL ABOVE PISTON

TRIP OIL BELOW PISTON DISC

RESETTING OPENING

TRIPPING

Drain

RESETTING/OPENING/TRIPPING

OF STOP VALVE

TURBINE OVERSPEED TRIP DEVICE

FLY BOTL

Aux Trip Oil

AUX START-UP OIL TO RESET

AUX TRIP OIL

Drain

TURBINE OVERSPEED TRIP DEVICE

TURBINE SHAFT

AUX START-UP OIL TO RESET

AUX TRIP OIL

DrainTRIPPING OF Thrust Bearing TRIP DEVICE

RESETTING OF Thrust Bearing TRIP DEVICETEST

OIL

THRUST BEARING TRIP

DEVICE

Drain

Control Oil

Atmosphere

Vacuum

Aux Trip Oil

Drain

LOW VACUUM TRIP DEVICE

Resetting Of Low Vacuum Trip Device

Tripping Of Low Vacuum Trip Device

Low Vacuum Trip Device

HP Sec. Oil

IP Sec. Oil

Follow - up valves

Hydraulic ConverterAux Sec Oil

from S/G

Trip Oil From MTV

Trip Oil From MTV

Electro-Hydraulic Converter Follow - up valves

Amplifier Piston

Amplifier Piston

0-10V Supply from

ATRS

Control Oil

Control Oil

Trim Device

Trim Device

HP Sec. Oil

IP Sec. OilHG & EHG

HG/EHG

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