 There are many Types of Power Plants like Hydro, Thermal,
Wind,Nueclear etc.but we discuss here only Three.
Specification of Generators used in Hydro and Steam
Power Plants.
So, Our Focus is on Specification of Generator used
1.Hydro Power Plants
2.Steam Power Plants

HYDRO GENERATORS:
General Specification:
 Hydro Generators are low speed salient pole type machines.
 Rotor is characterized by large diameter and short axial length.
 Capacity of such generator varies from 500 KW to 500 MW.
 Power factor are usually 0.90 to 0.95 lagging.
 Available head is a limitation in the choice of speed of hydro generator.
 Standard generation voltage in our country is 3.3KV, 6.6KV, 11
KV ,13.8 KV, & 16KV at 50 Hz.
 Short Circuit Ratio varies from 1 to 1.4.

Hydro Generators:
 World number one in hydro generators

hydro power is dependent on individual dam site conditions, technical and operational requirements differ from plant to plant. That's why our hydro generators are tailormade (Different) for every project.

Medium & Large Hydro Generators:
 All of medium & large hydro generators (> 50 MVA)
 High reliability and highest outputs available worldwide.
 Stator windings insulation: class F
 Closed loop air ventilation circuit is provided as standard with our medium and large Generators.
 In cases where high output is required we offer state-of-the-art cooling systems. (highest level) (These feature direct water cooling in the stator winding by means of stainless steel hollow strands and direct water cooling of the rotor winding )

Small Hydro Generators:
Small Generators Specification:
 Ratings: up to 50 MVA / 600 rpm
 Mounting(Support): vertical or horizontal
 voltages: usually between 3 and 15 kV
 cooling: open or closed circuit (air / air-water)
 excitation system (AVR): static or brushless available as standard in our products .

Small Hydro generator
Alstom Hydro Manufacturing site in
Galindo (Spain)

Generator used in Hydro plant:
1.Asynchronous generators:
 Asynchronous generators suitable for hydropower applications
Specification:
 Voltage from 380V to 13.8kV.
 Frame size 250 to 800.
 Rating more than 1MW.
 Steel frames.
 Standards: IEC 60034-1 and CEI EN 60034-1 (Rating & performance of GEN )

 Synchronous generators suitable for industrial and hydropower environment and applications.
Specification:
 Voltage from 380V to 13.8kV.
 Low Voltage Range: 10 to 6000kVA.
Medium and High Voltage Range: 500 to 8000kVA.
 Aluminium and steel frames.
 Standards: IEC 60034-1 - CEI EN 60034-1 - BS 4999-5000 -
VDE 0530 - NF 51-100, 111 - OVE M-10 - NEMA MG 1.22.

Generator SGen-2000H(Hydrogen-Cooled)
Description:
 Hydrogen-cooled generators are used for rating up to
600 MVA for simple cycle, combined cycle and steam power plants.
 Large voltage rating is due to better heat transfer and lower density characteristics of hydrogen compared to air.
 The generator is completely sealed

Technical Data:

Technical Features:
 Smaller in size and more efficient than equivalently rated air cooled model
 Not Affected by dirt, oil and humidity(air moisture)
 Hydrogen and seal oil supply system to facilitate installation and maintenance
 Bearing brackets and shaft seals arranged to minimize H2 leakage
 Stator bar tightness is maintained with pre-stressed ripple springs or Global
Vacuum Pressure Impregnation (GVPI) to avoid mechanical and electrical degradation
 Stator end windings surrounded by a compact support ring, made of glassfiber, to provide radial support
 Indirectly or directly cooled stator windings, depending on MVA rating, to minimize machine size
 Directly cooled rotor windings for high current (MVA) capability

Hydrogen-Cooed with Water-Cooled
Stator Windings
 Description:
 Generators with water-cooled stators and hydrogen-cooled rotors are optimal for the highest output ranges.
 Direct water-cooled stator is suitable for large steam power plant applications ranging up to
1270 MVA .

Technical Features:
 Typically equal or more efficient than equally rated air-cooled model
 Smaller in size than equally rated hydrogen- and air-cooled models
 Not affected by dirt, oil and humidity
 Simple, low maintenance, primary water system with demineralized/pH controlled cooling water to suppress copper corrosion
 Bracket bearings and shaft seals arranged to minimize H2 leakage
 Stator bar tightness is maintained with pre-stressed ripple springs to avoid mechanical and electrical degradation
 Stator end windings surrounded by a glass-fiber cone for radial support
 Water-cooled stator winding to maximize output
 High-pressure multi-stage compressor blower for intense cooling
 Hydrogen-cooled rotor winding for high current (MVA) capability

Generator SGen-1000A(Air-Cooled)
 Air-cooled generators are available using either Totally Enclosed Water to Air-
Cooled (TEWAC) or Open Air-Cooled
(OAC) systems depending on your requirements.
 Due to its compact arrangement SGen-
1000A series is ideal for simple cycle, combined cycle, cogeneration and steam power plants ranging up to 350 MVA.

Technical Specification:

Technical Features:
 Can be operated unattended
 Ease maintenance in the field
 Open or closed cooling circuit option to accommodate varying site conditions and customer preferences
 High efficiency filters
 Pressurized shaft seals to enhance cooling air cleanliness
 Spring mounted stator to minimize vibration transmission to foundation
 Uniform temperatures over the entire stator and rotor lengths through:
- Symmetrical ventilation of the stator and rotor
- Indirectly cooled stator winding with excellent heat transfer
- Radially ventilated stator core
- Directly, radially cooled rotor winding

Generator SGen-100A-4P(Air-Cooled)
Descroption:
Industrial power plants equipped with steam and gas turbines and SGen-100A-4p series generators keep process costs down due to the high efficiency levels of cogeneration.

Technical Features:
 Ratings up to 65 MVA
 Air cooled rotor and stator
 Different types of cooling available – TEWAC, DAC, CACA
 Design suitable for 50 Hz / 60 Hz
 Compact design
 High efficiency up to 98.5%
 Minimized generator length
 Low total weight
 Available as generator – gearbox - package on requirment

Generator SGen-100A-2P(Air-Cooled)
 2 pole generators are customized for the use on gas and steam turbines.
 SGen-100A-2p series generators are available with different types of cooling systems: TEWAC (totally enclosed water-to-air cooling), CACA (closed air-to-air cooling) or DAC (direct air cooling, cooling-air intake via filter).

Technical Features:
 Air cooled stator and rotor winding
 Different types of cooling available – TEWAC, DAC or CACA
 Ratings up to 300 MVA
 Design suitable for 50 Hz / 60 Hz
 High efficiency up to 98.7%
 Modular design – easy to adapt to customer requirements
 Stator core fixed on base frame by welding
 Brushless or static excitation

4 hydroelectric generators with the following characteristics as a combined operating system
(yunfeng Jilin, China)
Totals Production: 9,500 kilowatts.
Annual Production: 47,000,000 Kilowatt-hours.

General Electric AC Generator installed in
1930. Excitation is provided by a Basler static exciter.
 Voltage: 7200 volts
 Speed: 360 RPM
 Cycles: 60hz
 Phase: 3
 Power Factor: 0.8
 Production: 1,170 Kilowatts
 The Turbine unit is a Francais type
 Rated Horsepower: 1,340 hp

:
Westinghouse AC Generator installed in 1928.
Excitation is provided by a Basler static exciter.
 Voltage: 7200 volts
 Speed: 360 RPM
 Cycles: 60 Hz
 Phase: 3
 Power Factor: 0.8
 Production: 1,012 Kilowatts
 The Turbine unit is a Francais type
 Rated Horsepower: 1,340 hp

Westinghouse AC Generator installed in 1954. Excitation is provided by a
Basler static exciter.
 Voltage: 7200 volts,
 Speed: 257 revolutions per minute,
 Cycles: 60 hz.,
 Phase: 3,
 Power Factor: 0.8,
 Production: 3,500 Kilowatts.
 The Turbine unit is a Francais type,
 Rated Horsepower: 4,070 hp,

Unit # 4:
National Industry AC Generator installed in 1990.
Excitation is provided by a Basler static exciter.
Voltage: 7200 volts
 Speed: 211.8 revolutions per minute,
 Cycles: 60hz
 Phase: 3,
 Power Factor: 1.0,
 Production: 5,850 Kilowatts.
 The Turbine unit is a Francais type,
 Rated Horsepower: 7,600 hp,

 The is the world’s largest hydroelectric power station by total capacity, which will be 22,500
MW.
 It will have 34 generators:
 32 will be main generators, each with a capacity of 700 MW
 The other two will be plant power generators, each with capacity of 50 MW.

 Each of the main generators weighs about 6,000 tonnes
 designed to produce at least 700 MW of power.
 The generator produces electrical power at 20 kV
 The Three Gorges Dam project uses Francis turbines.
 The diameter of each turbine is 9.7/10.4 m (VGS design/Alstom's design).
 speed: 75 rpm
 Normal rated power of the generator : 778 MVA
 Power Fector:0.9
 Outer diameter of the generator stator is 21.4/20.9 m.
 Inner diameter is 18.5/18.8 m.
 Height of the stator is 3.1/3 m. (biggest stator in world)
 The load at the bearing is 5050/5500 tonnes.

 Average generators efficiency is over 94%
 highest efficiency : 96.5%.
 Most of the generators are water-cooled.
 Some newer ones are air-cooled
 The generators are manufactured by two joint ventures.
 Alstom , ABB
 Other Chinese company Haerbin Motor. The other includes Voith , General Electric , Siemens
(abbreviated as VGS),

Three Gorges Dam Francis Turbine

 Generator For Hydro Power Plants

 Turbine generator
 speed : 3600 rpm
 Voltage: 12,470 Volts
 Phase:3
 Frequency:60 Hz
 Generator rating of 6250 kVA at a power factor of 0.80

 Turbine Generator Specification:

TURBO GENERATOR – BASIC DATA by ABB
 SPEED 3000 RPM
 FREQUENCY 50Hz
 Cos fi 0.86
 CURRENT 10334 A
 DEGREE OF EFFIENCY 98.65 %
 INSULATION CLASS F
 VOLTAGE 13,8 kV; +/- 7,5%
 WEIGHT 280 t
 POWER 247 MVA

TES Alternators Specification:
Type: Synchronous Alternator GAK

Power range: 30 - 1500 kW
 4 up to 24 poles
 Voltage up to 6300 V
 Frequency 50, 60 Hz

 Connection Y, D
 Design IP23/IC01 (other on request)
 Mounting arrangement: IM1001-horizontal, IM3011 - vertical
 Insulation class F, utilization B (prolonged operating life)
 Temperature sensors: 3 x PT100 in the winding, 2 x PT100 in the bearings
 Shaft end on request, direct mounting of a turbine or a flywheel possible
 Speed sensor, centrifugal switch - on request

 Synchronous Alternator GSH
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Power: 30 - 15 000 kVA
Speed: 1500, 1000, 750, 600, 500, 428, 375 rpm (lower on request)
Voltage: 3 x 420 V, 3 x 690 V, 3 x 950 V (High voltage on request)
Brushless built-in exciter
Single or parallel operation with the network
Design IP23/IC01 (other on request)
Mounting arrangement: IM1001, IM3011
Insulation class F, utilization B (prolonged operating life)
Heat protection: 3 x PT100 in the winding, 2 x PT100 in the bearings
Shaft end on request direct mounting of a turbine possible
Strengthened bearings, radial and axial forces possible
Speed measuring
Pulse transmitter with a toothed wheel
Voltage Regulator in the terminal box
Power Factor Regulator in the terminal box (on request)

4MW Leroy Somer Steam Turbine Generator Set
 degrees F inlet and 150 psig outlet.
 Associated throttle flow at these conditions is
139,040 lb/hr.
 Turbine design speed is 6000 rpm with gearreduced generator speed of 1800 rpm.
 The unit generates electricity at 12,470 Volts, 3 phase, 60 Hz.
 Generator rating of 5000 kVA at a power factor of 0.80

 STEAM TURBINE GENERATOR DATA
 Steam Turbine - General Electric - Number 87451:
Rated 60000 KW - 3600 RPM - 21 Stages
Steam Pressure 1250 PSIG - Temp 950 Degree F -
Exhaust Pressure 1.5"HG ABS
 Generator:
 No.6792055 Hydrogen
Cooled:Rating:Capacity: Type ATB 2 Poles 60
CyclesGas Pressure 0.5 PSIG15.0 PSIG3 PH Y
Connected for 13800 VoltsKVA 7058881176Excitation
250 VoltsKilowatts 6000069000Temperature Rise Not to Exceed:Armature Amps 2953339660 DEG C on
Armature by DetectorField AMPS 63570085 DEG C on Field by ResistancePower Factor 0.850.85

135MW Class Turbo-Generator (Nanjing china)
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Company manufactures 135MW class 3-phase synchronous turbo-generator matched with 135MW class steam turbine.
The cooling method is close cycle air-cooling and rotor is cooled internally with air. The air cooler is located under generator.
The excitation method is AC brushless exciter.
Generator is equipped with high precision digital AVR
(Automatic Voltage Regulator).

(BROX BOILER COMPANY)
 Type: Model200-Model8000
 Capacity: 200kg/h-8000kg/h 4bar- bar
 Fuel : gas,lightoil,heavy oil
 Boiler efficiency: 90%
 Burning efficiency: 91-92%
 Delivered with followings Electric panel
Economizer Burner Feedig pumps Condensing tank Water softener.

ADVANTAGES OF BROX STEAM
GENERATORS:
 Brox steam generators can achieve steam in 5 minutes in the desired level.
 It does not need to be run before usage.
 It does not have any water level instruments. Because the system is controlled automatically, nobody needs to be present.
 Can produced vertically and horizantal depending on your request.
 It is designed to give steam in the shortest time, to save time and energy, and to provide maximum safety for the industries in need.
 With the design and fast firing capability, it will reduce the consumption to minumum. When compared with classic boiler, it saves 10% more.
 It is designed to fire natural gas, diesel fuel and fuel oil. It can use all three with the same firing unit.

International power machinery company:
 Steam Turbine Generator Units:
 6000 KW
General Electric 625 lbs. steam pressure
215 lbs. exhaust 850 degrees F 13,800
 17,500 KW
Westinghouse 1400 lbs. design pressure / 800 lbs. operating pressure 900/825 degrees F 13,800
 25,000 KW
General Electric 1400 lbs. steam pressure 900 degrees F
13,800
80,000 KW
ABB 1250 lbs. steam pressure 200 lbs. exhaust 935 degrees F
13,800

Sample quotation on 30MW Condensing Steam
Turbine Gensets.

1.1 Main technical parameters of the steam turbine:

1.2 Main technical parameters of the generator:

 CLIMATIC CONDITIONS
 ISO Conditions
 Site Conditions (Assumed)
 DIESEL ENGINE:TECHNICAL DATA
 Equipment fitted on the engine
 Fuel Circuit
 Cooling Water Circuit

Generator
 Alternator is self-excited, brush less type and IP 23 enclosure (IEC).
Technical data of Generator :
 - Rated KVA
 - Power factor
 - Max. Alternator output at site
 - Duty
 - Rated speed
 - Output voltage
 - Efficiency at 100% load and 0.8 PF
 - Direction of rotation
 - Number of poles
 - Rated frequency
 -Insulation class
 - Temp. rise class
 - Excitation and AVR type
 - Connection

1875 KVA
0.8 lag
1500 KW
Continuous
500 RPM
400 V
90.7 % anticlockwise
12
50 Hz
F
F
Brush-less, AVR
Star

 Control Panel provides necessary Monitoring,
Control.
 Protection functions for the DG set. It is located in the DG control room

 Programmable Logic Controller (PLC)
 Generator Protection relays (SIEMENS)
 Automatic Voltage Regulator (AVG)
 Meters, indicators, hour counters
 Push buttons, selector switches
 Engine Frequency Monitoring Unit

 Analog Engine RPM meter
 Ammeters (3 nos.)
 Voltmeter with selector switch
 Frequency meter
 PF meter
 Analog Excitation fundamental ammeter
 Analog Excitation harmonics ammeter
 Counter for running hours

 Voltage controlled over current
 Under / Over voltage
 Under / Over frequency
 Earth fault
 Very high Alternator bearing temperature

 Low lube oil priming pressure
 Breaker engaged
 Engine start permission
 Unit ready for excitation
 HFO operation not possible
 PLC failure
 Ready for excitation
 DG breaker ON
 DG breaker OFF
 DG breaker Tripped