What Is The Typical Specification of AC Generator
The technical specifications of 30 KVA Diesel Engine Generators are particularly presented here for the purpose to prepare tender documents to invite Bidders to participate a tender. The technical specifications of AC Generator, Diesel Engine and related Accessories are described in sequence below:
The technical specification of Alternating Current Generator or Alternator shall be as below-
Prime Rating : 30 KVA
Voltage : 50Hz, 380± 5%, 50Hz ± 1% Voltage fluctuation limit: 5%, from
no load to full load
Type : Brushless Excitation with AVR
Phase and Wire :
3 phases and 4 wires
Power Factor : 0.8
(lagging)
Insulation :
Class H with Tropicalization
Degree
of protection : IP-21
Over
speeds Capacity : 125%, 2min
Wave
from : < 3%
distortion
Voltage
Regulator : Solid sate
Volts-per-Hertz Protection
Voltage
Regulation : <1%
Voltage
Adjusting : 10%
Voltage
Gain :
Adjustable to compensate for engine speed drop and line loss
Climatic
condition : 7°-45°C, 98%
humidity
Starting
: Auto on detection of mains failure
Stopping
: Auto on detection of mains return
OR :
Manual Stating with Battery start
:
Manual stopping with stop switch
Specification of Diesel Engine
The technical specification of Diesel Engine shall be as below-
Type :
Water/Air Cooled Diesel
Cycle :
4 Strokes
Year of
Manufacture : 2014 or latter.
Engine
Speed (Nominal) :
1500 rpm 5% on full load.
Type of
operation : Continuous 12 hours operation for every 24
hours.
Standard
Cooling Method :
Radiator/Others
Fuel
oil : Diesel Fuel Oil (ASTM NOZ-D)
Lubricating
oil : API Service Grade
Governor Characteristic
The specification of Governor of the Diesel Engine shall be
as below-
: Mechanical Type
Facility of isochronous & droop mode
operation.
Droop percentage adjustable.
Variable Governor Speed;
Compatible
with ±
1% variation in generation frequency.
Country of Origin
Country of Origin & Country of Manufacturing/Assembling
for Engine and Alternator shall be
U.S.A, UK, Japan, France, Sweden, Germany, Italy, Norway, Spain, Denmark,
Finland, Austria, Netherlands.
Specifications of Accessories
The Accessories specification shall be comply with
international and national standards.
Earth Electrode
The specification of earthing or earth electrode shall be
as less than 2 Ohms to be done by GI pipes at the depth of electrode to be minimum
80 feet.
Civil works
Civil works are the part of generator installation. Base
Size: 5'x3'x1' (LxWxD);
Generator Commissioning: 50 Liters diesel with a drum for
each DEG;
Silencer pipe length: 15 ft (minimum).
Generator Installation Cable
The specification of cable for installation of Generator
is as- Brand: BRB/SQ/Poly/PC;
Cable Size: NYY (4x25) rm; Length: 20 m;
Specification Engine Accessories
The specifications of engine accessories under scope of
supply shall be as below-
Air Cleaner – With
Service Indicator
Base – Structure Steel
Breather – crank case
Charging- Alternator
Cooler--Lubricating Oil/ Air Cooled.
Fuel Filter- Industry Standard
Internal Fuel Tank -With capacity to run at least 10 hours
of full load operation
External Fuel Tank –With capacity to run 24 hours of full
load operation with feeding connection to the internal tank
Speed Governor-
Lube oil pump-gear driven
Manifolds –exhaust; dry
Radiator –blower fan, fan drive
Starting electric –12v DC with external battery (Lead Acid)
Battery charger
Exhaust silencer [70 db (A)]
Lube oil Level Regulator, priming pump
Specifications of Diesel Engine Generators Protection System
Automatic engine
shutdown in the event of fail to start, low oil Pressure, high engine
temperature
Generator: Brushless with Automatic Voltage Regulator
and voltage control Timer
Connection to Bus-bar:
Connection between ATS and station bus-bar including
necessary cables;
Distribution Board,
cable tray and circuit breakers at both ends shall be protected as per
instruction guide.
Control Panel Protection System
Auto transfer Switch (ATS) with Manual Override
Timer mains failure (5 sec ~ 30 min)
Timer mains restored (5 sec ~ 10 min)
Ammeter (per phase and phase to phase)
Voltmeter (per phase and phase to phase)
Frequency Meter
Emergency Stop Push Button
Engine Control Switch for Auto/Run/Off
Lamp Display
Oil Pressure and Water Temperature Gauge
Operating hour meter
Manual stop & Starting Switch
Phase Selector Switch
Shut offs with indicator for
- Emergency Stop
-High Water Temperature
-Over Speed
-Changing (Indicator only)
Voltage Adjust Timer -
Lower and higher cut of voltage; Should be 245v~424v average
Spare Parts Guarantee
The Bidder shall provide a separate guarantee to the effect that, he shall guarantee the flow and availability of all spare parts and units without major design changes for at least 5(five) years from the issuance of Final Acceptance Certificate (FAC).
Maintenance Support
Maintenance Support up to the end of 2 [two] years of
Performance Guarantee /Warranty Period:
v
The Bidder shall provide at least 1(one)
Operation and Maintenance Engineer to provide full maintenance support for all
sites up to the end of the Performance Guarantee Period. This support service
shall start from the date of first energization.
v
The selection of the maintenance engineer shall
be entirely depends on Employer’s judgment. The bidder shall be responsible for
all types of expenditure to be borne for that manpower, including all type of
transportation and office space. The bidder shall include the cost of necessary
spares required for the smooth running of the supplied DEGs during this 2 [two]
years period.
v
Five years Maintenance Support after 2[two]
years of Guarantee Period as optional item: The Bidder shall quote as ‘an
optional item’ the price for ‘Five years Maintenance support after Guarantee
Period. The Bidder shall include the quotation for a period of 5 [five] years
‘after completion of the Performance Guarantee Period.
Provisional Acceptance Test (PAT)
Before acceptance of the installed system/ equipment,
Employer’s representatives shall carryout a test on site, detailed tests of all
equipment, working reliability, concurrence to agree technical and other
specifications, inventory checking of installed equipment etc. Such tests shall
be termed as “Provisional Acceptance Test (PAT)”. Prior to commencement of such
tests, the contractor shall submit a proposed procedure for the PAT to be
subsequently passed by the purchaser. The PAT will be done by a joint team of Employer’s
Engineers and bidder’s Engineers. The bidder shall be totally responsible for
arrangement of all equipment, consumables, test gears and measuring equipment
required for the PAT.
Final Acceptance Test (FAT)
After completion of the PAT(issuance of PAC) and cut-over of
the system, the Engineers of the Contractor will take prompt necessary steps to
remove all types of faults and replace all types of faulty equipment at the
cost of the Contractor. At the end of the “Performance Guarantee Period for the
Contract”, the overall performance of all equipment will be reviewed and this
review shall be termed as “Final Acceptance Test (FAT)”.
The Contractor shall be responsible for arrangement of all
equipment, consumables, test gears and measuring equipment required (if any)
for such review tests.
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