Four
operational GEC EM610C 50Hz gas turbine
generator
sets featured with:
o 13
stage compressor and 2 stage power turbine, single shaft supported by 2 bearings
o 3 x
3.3 KV motor starter and 1 x diesel engine starter
o 2-pole,
3 phase 50Hz 11.8 KV 79.4 MVA air cooled generator
o Brushless
exciter control system
o 11.8/132
KV 80 MVA OFAF generator transformer with on load tap changer
o 11,800/433
V 250KVA ONAN unit transformer
o 110V
AC inverter with battery / charger system
o High
scanning speed temperature monitoring system with IBM PC Data acquisition
program
o Full
package of auxiliaries
o With 2
diesel storage tanks and 1 LPG storage plant as options
History
of the Units
The
model EM610C gas turbine sets, manufactured by GEC Gas Turbines Limited (UK) and
commissioned in 1981. They are
designated CG1, CG2, CG3 & CG4. With the exception of CG2 (which has been
maintained fully operational for Black-Start capability) the units were
available for service through until 1998 when they became surplus to generation
requirements in the system.
The two remaining units have been dismantled and are in storage.
The operating hours/starts for CG1-CG4 are 598/661, 529/665, 604/665, and
460/646 respectively.
Design
Data
o Base
load 61.7MW and peak load 66.9MW under ambient air conditions of 30oC and 1013
mbar
o Corresponding
thermal efficiencies for base load and peak load at 26.7% and 27.2 %
o Normal
start/Quick start to base load total time required at 13.5 min and 7.5 min
o Normal
start/Quick start to peak load total time required at 15.5 min and 10 min
1.
Gas Turbine
o Single
shaft, 2 bearings supported on rigid steel stools
o 13
compressor stage, 2 power turbine stage
o 10
individual reverse flow combustion chambers
o Designed
to run on liquid fuel oil
o Mean
gas temperature at first row guide vanes at 970oC base / 1015oC peak
o Mean
gas temperature at turbine exhaust at 532oC base / 572oC peak
1.1
Fuel Specification
o Industrial
diesel oil
§ Minimum
calorific value at 45579 KJ/kg
§ Minimum
kinematic viscosity 1.6 Cs
1.2
Fuel Oil System
o One
fuel oil forwarding skid comprises of 6 AC pumps; and 1 DC pump for blackstart.
o 2
staged filtration and pumping at gas turbine side.
o Hydraulically
control fuel throttle valve before combustion chambers.
1.3
Fuel Throttle Valve Control Oil System
o Fed
from main lub oil rail powered by AC motor pump
o Dual
circuit with filter and accumulator
1.4
Governor
o Mk 2
unified governor system
o Electronic,
Electro-hydraulic and Electromechanical units
1.5
Combustion chamber
o Ten
combustion chambers fabricated from nimonic 75 alloy
o Permit
quick removal for inspection
o LPG
ignition, simplex type burner nozzle
o Individually
metered and temperature monitored
1.6
Starting Equipment
o 3.3 KV 746KW
1487rpm induction starter motor for CG1, CG3 and CG4
o Turbo charged V
type 1194KW 2100rpm diesel engine starter for CG2
o Starter motor
coupled through a torque converter to the gas turbine rotor
o Fottinger principal Voith twin
disc torque converter
1.7
Lubrication and Jacking Oil System
o Mineral
oil BS489 grade 46 total quantity 200Kg
o Shaft
driven positive displacement oil pump via auxiliary gearbox
o 1 AC
motor centrifugal oil pump
o 1 DC
motor centrifugal oil pump for emergency standby
o 2 AC
motor jacking oil pumps
o 1 air
oil cooler and 1 duplex strainer
1.8
Barring System
o Hydraulic
ratchet powered by jacking oil pump
o Automatic
Timer control
o
Manual
control provided
1.9
Cooling Air and Gland Packing System
o Bled
from compressor casing, cooled by air blast cooler
o Cool
the turbine discs, diaphragms and stator rings
o Pack
the turbine end bearing glands
1.10
Intake System
o Turbine intake
filter package in a filter house
§
Coalescer safety pad
§
Duracel high efficiency filter
§
Differential pressure switch
§
Inlet silencer
§
Stainless steel trash screen before turbine
inlet
o Generator filter
package in a pair of wing houses
§
Dust louvre inertial separator
§
Amerkleen pad
1.11
Lagging and Cladding
o Intersperse
acoustic covers
o Centre,
intermediate and turbine casing cladding
o Easy
to remove for turbine inspection and maintenance
1.12
Compressed air system
1
AC motor driven, air cool, 2 cylinder air compressor
o 1 air receiver
2.
Generator
o 2-pole,
3 phase 50Hz 11.8 KV 79.4 MVA air cooled generator
o Class
F insulation, delta connection
o Temperature
sensors at stator core, windings and air circuit for monitoring
o Full
scheme of electrical protection
2.1
Exciter
o
Revolving
armature Brushless exciter with silicon diodes
o
Directly
coupled to the generator rotor
o
Static
circuit AVR
o
Manual
control channel
o
Manual
follow-up circuit
o
Full
automatic protective devices
2.2
SSS ( synochro-self-shifting) Clutch (CG3 and CG4 only)
o Installed
between the gas turbine and the generator
o Fully
automatic, ‘freewheel’ device transmits power through gear-tooth element
o Permits
the generator to become a synchronous compensator
3.
Transformer
3.1
Generator Transformer
o Pauwels
Trafo 11.8/132 KV 80 MVA generator transformer
o DY
connection, OFAF cooling with on load tap changer
o Full
scheme of electrical protection
3.2
Unit Transformer
o Woden 11,800/433 V
250KVA unit transformer
o DY connection,
ONAN cooling
o Full scheme of
electrical protection
4.
Other Auxiliaries
4.1
Inverter
o 110V
AC and DC power supply to essential auxiliaries and control
o 56
Hoppecke battery cells
4.2
Temperature Monitoring and Data Acquisition System
o High
scanning speed Digilink 4+ monitor system
o MS DOS
base data acquisition program KVIEW
o Real
time data colour graphics, trenching and event logging
4.3
Control Room Layout
o AC and
DC auxiliary switch board
o Essential
supply cubicle
o Dual
battery charger cubicle
o Fire
detection and protection cubicle
§ Control/extinguishing and detection modules
o Local
control panel suit
§ Synchronisation, excitation, generator
protection panel
§ Contains all the necessary relays and
circuitry
§ Governor
panel
§ Contains
the Mk 2 modular governor system
§ Turbine
control cubicle
§ Auto
start/run up control
§ Auxiliaries
control
§ Monitoring
equipment cubicle
§ Vibration
monitor
§ Turbine
thrust wear monitor
§ Temperature
monitor
§ Torch
lit amplifier
§ Dual
flame detection module
4.4
Fire Fighting Equipment
o Afa-Minerva
Automatic fire fighting and detection system
o Halon
system covers Turbine and Generator enclosure, Control room, Battery room and
Fuel annexe.
o Water
spray system protects Generator transformer, Unit transformer and Lubrication
oil cooler.
5.
Document and Others
5.1
Documentation
o Full
set of Operation, Maintenance Volumes
o Full
set of sub-contractor literature
5.2
Turbine maintenance special tools
o Special
tools are available with list
5.3
Turbine and generator spares
o Spares
are available with list
6.
Options (not available)
6.1
Diesel Oil Tank
o Two
3,000 ton diesel oil tanks and pipework
6.2 LPG
Plant (Not Available)
o One
1,400 Kg LPG storage vessel and pipework
o Four
electrical vaporisers
Contact Milt Fyre milt@rmaglobal.com
Email:
sales@rmaglobal.com Phone: (503) 595-5418 Fax: (503)
635-0091
Copyright 1995-2008: RMA Inc.
