BHEL, Hardwar 6.1-0100-99/1

Steam Turbine Technical Data Description Construction, Speed & Steam Pressure Load

Rated Load 600 MW

Maximum Load under valve wide open (VWO) condition 629.2 MW

Construction

Three cylinder reheat condensing turbine

Single flow HP Turbine with 14 reaction stages Type : H30-100-2

Double flow IP Turbine with 10 reaction stages per flow Type : M30-63

Double flow LP Turbine (2 no.s) with (5 drum + 3 module) stages per flow

Type : N30-4x6.3

2 Main Stop and Control valves (HP casing mounted) Type : EV 320-1

2 Reheat Stop and Control Valves (Floating) Type : IV 560

1 Swing Check Valve in cold reheat line DN-800 Make : BHEL, Trichy

2 LP Bypass Stop and Control Valves with actuators & HPSU (High pressure EHA based)

Make: CCI Switzerland

Extraction Swing Check Valves

Extraction 1 : No valve

Extraction 2 : 2 Swing Check Valve with actuator and 2 Swing Check Valve without actuator

DN 600 Make : BHEL, Trichy

Extraction 3 : 2 Swing Check Valve with actuator and 2 Swing Check Valve without actuator

DN 500 Make : BHEL, Trichy

Extraction 4.1 : 2 Swing Check Valves with actuator DN 500 Make : BHEL, Trichy

Extraction 4.2 : 2 Swing Check Valves with actuator DN 500 Make : BHEL, Trichy

Extraction 5 : 1 Swing Check Valve with actuator and 1 Swing Check Valve without actuator

DN 400 Make : BHEL, Trichy

Extraction 6 : No valve

Extraction 7 : 1 swing check valve with actuator and 1 swing check valve without actuator

DN 250 Make : BHEL, Trichy

BHEL, Hardwar 6.1-0100-99/2

Speed

Rated speed 50.0 c/s

Speed limitation in load and station operation

Max. Speed, no time limitation

Min. Speed, no time limitation

Permissible for maximum 2 hours during the life of LP blading Speed below Speed above

51.5 c/s

47.5 c/s

47.5 c/s 51.5 to 60 c/s

Speed exclusion range at operation without load * 7 to 47.5 c/s

Standard over speed trip setting Max. 55.5 c/s

* This speed range should be passed through in one smooth operation to avoid endangering the blades due to resonance

Steam Pressures

Rated ♦ Long time operation♣ Short time operation♥ Unit

Initial Steam 170.0 178.5 203.9 ata

Before 1st HP drum stage 158.6 171.8 171.8 ata

HP cylinder exhaust 42.9 49.4 51.5 ♠ ata

IP cylinder stop valve inlet 38.7 44.8 46.3 ♠ ata

Extraction 7 65.8 73.6 73.6 ata

Extraction 6 42.9 49.4 51.5 ata

Extraction 5 19.2 22.6 22.6 ata

Extraction 4 7.6 9.15 9.15 ata

Extraction 3 2.56 3.12 3.12 ata

Extraction 2 0.967 1.21 1.21 ata

Extraction 1 0.392 0.49 0.49 ata

LP cylinder exhaust 0.1033 0.31 0.31 ata

♦ These values correspond to 600 MW load with 3 % make-up and 0.1033 ata back pressure with all heaters in service and rated steam conditions.

♠ The safety valves must be set so that short time values are not exceeded. ♣ Long time operation: Upper limit value, permissible without time limit. ♥

Short time operation: Permissible momentary value. The aggregate duration of such swings must not exceed 12 hours in any one year

All pressures are absolute pressures

BHEL, Hardwar 6.1-0100-99/3

Low vacuum trip, standard setting

Electrical low vacuum trip 0.3 bar

Electrical low vacuum trip bypass operation 0.6 bar

Seal steam supply system

Pressure in seal steam header (above atmospheric) 35 mbar

Axial shift

Alarm ± 0.5 mm

Trip ± 1.0 mm

Direction of rotation

Anti clock wise when viewed from Front Pedestal towards the Generator