Function of Governing System

a. Speed Control

b. Load Control

c. Extraction Pressure Control

d. Turbine Protection

Governing System of SKODA MachineDuel Mode of Governing

a. Hydraulic Governing ---- SKODA System

b. Electronic Governing --- Triconex System

Operation Modes of Governing System

Hydraulic Mode

Parallel Manual Mode

No Extractions V2 & V3 will be 100% Open

Only Speed Control

Only EHP100.1 will be in the Picture

EHP100.1 will Take the Leading role & 15.1A will track EHP100.1 Path ( 10% less than EHP100.1).

15.1A will Control the Secondary Oil Pressure ( Speed of the Turbine )

Parallel Auto Mode15.1A will Take the Leading role & EHP100.1 will track 15.1A Path (10% More than 15.1A).

15.1A will Control the Secondary Oil Pressure ( Speed of the Turbine )

It Controls

Speed of the Machine -- Master Control Mode

Load on the Machine ---Droop Control Mode

Extraction Pressures

TYPES OF OILOIL FROM DISCHARGE OF A O P

DISTRIBUTION OIL LUB OIL

PRIMARY OILSECONDARY OILTERTIARY OILL P CONTROL OILOPERATING OILTRIP OILTEST OIL

Functions of the Oil

Indicates the Speed of the Turbine Primary Oil :

Operates the Control Valve (V1)

Its Function is to Maintain the Speed of the of the Turbine as per the Set Point - 5953 rpm

Secondary Oil :

Its Pressure Ranges from 0 to 3.5ksc (0 to 5953 rpm)

App. Pressure at Over Speed ( 6600 rpm) is 4.33 bar

Its Pressure Ranges from 0.95 to 3.0ksc (From 0 to 100 % Opening of the V1)V1 Will Start Open at 0.95Ksc of Sec. Oil Pressure

Test Oil:

LP Control Oil : Operates the Control Diaphragm Valve (V3)

Generates the Trip Oil in the Main Relay at 25% of Load Limiter Position

Operating Oil :

Trip Oil: Operates Emergency Stop Valve

For Testing the Healthiness of Main Relay

Operates the Relief Valve (V2)Tertiary Oil : Its Function is to Maintain the HP Extraction Pr.Its Pressure Ranges from 0 to 3.5ksc (From 0 to 100 % Opening of the V2)

Its Function is to Maintain the LP Extraction Pr.Its Pressure Range is 0 to 3.5ksc (From 0 to 100 % Opening of the V3)

Generation Points of the Oils

Primary Oil :

Secondary Oil :

Impeller - Hydraulic Revolution Sensor Mounted on the Turbine shaft

Down Stream of the Restricted Orifice Mounted in the distribution Oil Network.

Its Pressure Will be Monitored by

1. Load Limiter

2. Medium Speed Changer

3. Electro Hydraulic Converter

(EHP 100.1) Slow Controller

4. EHP 15.1A, Quick Controller

Hydraulic

Trisen TS 310

Test Oil:

LP Control Oil :

Operating Oil :

Trip Oil:

Tertiary Oil : Down Stream of the Restricted Orifice Mounted in the distribution Oil Network.

Down Stream of the Restricted Orifice Mounted in the distribution Oil Network.

Its Pressure Will be Controlled by EHP 15.1B

Its Pressure Will be Controlled by EHP 15.1C

Over Speed Trip Relay ( Bottom Part )

Over Speed Trip Relay ( Top Part )

Main Relay

Main Components of the SKODA Hydraulic Governing System

2. Primary Oil Transformer

4. Over Speed Trip Relay

3. Load Limiter

5. Main Relay

A. Medium Speed Changer

1. Impeller - Hydraulic Revolutions Sensor

B. EHP 100.1

15.1C

Speed Sensors

2/3

C

BASIC EHS

SIP

Triconex

DCS

15.1A

TURBINE

LP Control Oil

RO

V3

0 – 10V , 0 – 1 A

Restricted Orifice

Load Limiter

+/- 24V

0 - 1A

110V DC

Secondary Oil

100.1

15.1A MSO

Steam Inlet

ESV

V1

4-20mA0 – 10V, 0 – 1 A

TRICONEX GOVERNING SYSTEM

Tertiary OilRO

15.1B

V2

HYDRAULIC GOVERNING SYSTEM

Restricted OrificeSecondary Oil

100% Close

15.1AV1

Generator

TURBINE

Distribution Oil Distribution Oil

V2

ROTertiary Oil

100% Open

15.1B

RO

15.1C

100% Open

V3

LP Control Oil

Operating

Oil

MAIN RELAY

Trip Oil

Droop Changer

Primary Oil Transformer

110V DC

EHP100.1

MSO

BASIC EHS

Skoda interface

Panel 110V DC

4-20mA

+/- 24V, 0-1A

ESV

Steam Inlet

Trip Oil

LoadLimiter

HydraulicSpeed Sensors

Primary Oil

Operating Oil

Operating Oil

TEST OIL

Over SpeedRelay

Distribution Oil

Distribution Oil

Load Limitter

15.1A

POT

MSO

100.1

Secondary oil

Distribution oil

CONTROL VALVE

ACTUATOR

STEAM TO NOZZLE

Steam InletDistribution oil

RO

Turbine Speed / load Control

Over SpeedRelay

Distribution oil

Primary Oil

Test Oil Test Oil

Operating Oil

DiStribution Oil

Operating OilOperating Oil

Operating Oil Operating Oil

Trip OilTrip Oil

Load Limitter

Distribution Oil

Droop Changer

Primary Oil Transformer

EHP100.1

MSO

Primary Oil

Secondary Oil

Orifice

Trip Oil

Trip Relay

Secondary Oil

Turbine Operation

1. Sequence in AUTO

2. CONTINUE Command

3. Load Limiter goes to 25% & ESV Opens

Mode will Change from SHUT DOWN to READY TO START

4. START Command

V2 & V3 Position 100% EHP 100.1 Position 15.41% MSCH & Load Limiter Position 0 %

STG in SHUT DOWN mode

6. MSCH goes to 42% & then Load Limiter goes to 52% 7. CONTINUE Command

5. MSCH goes to 25%

Governor will Changeover from HYD to PAR AUTO

8. Mode Changes to STG IN WARM UP MODE

- Speed Target will Change to 1800rpm

9. CONTINUE Command

10. MSCH goes to 77%

11. Mode Changes to ACCELARATE MODE

Speed Target Changes to 5700rpm

12. CONTINUE Command

13. Load Limiter goes to 90%

14. Mode Changes to SYNCHRONUS SPEED

15. Synchronize the Machine

16. STG ON LINE MODE

17. Operation Mode Changes to DROOP