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Specifications
1. The contractor shall supply and install generator set with diesel engine to produce
electricity continuously measuring not less than at 200 kVA (Kilo Volt Ampere)/ 160 kW
(Kilo Watt) of the Prime Power. This generator set will be required to supply power to two
residences at 6/7 & 6/8 Soi Pattanasin, WangLee Compound.
2. A diesel engine must be connected with a generator by FLEXIBLE COUPLING and has
FLANGE to be attached between the engine and generator. The generator set will be placed
on the steel base with a rubber or spring supports at the base chassis to reduce vibration. The
engine will be mounted with bolts to hold the base firmly.
3. The contractor shall supply and install power control unit and switches automatically the
ATS (Automatic Transfer Switch).
4. ATS must have an automatic circuit breaker to prevent short circuit of the electrical system
between mains electricity and the generator.
5. All equipment must be new and never been used before specially the diesel engine and
generator.
6. The supplier of generator must be an authorized distributor by the manufacturer and have a
spare part distributor in Thailand with available for at least ten years from inspection and
commissioning date. The certificate must be included with the handover documents.
Equipment
1. Engine Power
- An engine is diesel engine for driving a generator included at least 6 cylinder with 4
stroke engine The horsepower continuation of Prime Power has more than 576 BHP or
less than 430 kW (net power engine) at 1500 rev / min as standard ISO 8528 or ISO
3046 and meet with the performance or quality standard of BS or DIN or ISO.
- The engine is low emissions compliant engine with equivalent of TA-Luft or EPA.
- The engine is produced of the production or assembly in Thailand as approved by TIS
(Thailand Industrial Standard.
- The Cooling system of the engine composes of honeycomb radiator and a cooling fan
with guard.
- The engine must have a temperature controlling unit.
- The engine must have a fuel system with pump and direct injector.
- The engine must have 24-volt DC motor by using 2 units of 12-volt battery with 200
amps per hour.
- The exhaust system of the engine must have a sound proofing pipe with residential
type or better to connect a flexible hose. The pipe inside the building must be
insulation type with aluminum wrapped around pipes to prevent heat. The extensional
pipe out of the building must be a joint bend type.
2. Fuel Tank
- The capacity of fuel tank must not be less than 1000 liters with the following:
(1) Valve Drain pipe, Air vent pipe, and fuel level indicator up to 900 liters.
(2) Hand Pump and Motor Pump are used together with same fuel pipe.
- The speed controller is Electric Governor Type.
- There is recharging system for the battery while the engine is running
- The gauge of the engine includes following:
(1) The engine operating hour meter.
(2) The temperature of the cooling water meter.
(3) Oil pressure gauge.
(4) Voltage meter and a battery current meter.
(5) The engine speed meter.
- In case of engine failure, the engine must have RESET switch for switching in a
normal state.
3. The Generator
- The generator must continuously produce AC power not less than 200 kVa (1600
kW), single phase, 2-wire 220 volt , 50 Hz Power factor 0.8 at 1500 rpm / min.
- The control voltage is a Solid State which has the following features:
1. The Voltage Regulation shall not exceed 1% from NO LOAD to FULL LOAD,
Power Factor is between 0.8 to 1, and Changing speed is not more than 4%.
2. With the sudden load changes, the voltage tolerances will be back no more than 3%
of the normal voltage within 0.6 seconds.
- The insulation of Rotor and Stator must qualify with CLASS F or CLASS H.
- The generator must withstand overload power from starting the motor with not less
than 250% of full power.
- The generator must have an automatically cutoff switch when the power is overload
with high voltage.
Control and Accessories
- The automatic circuit breaker is Toggle Drive model with over current and short circuit
protection according to IEC or VDE or UL standard.
- The current rating and the Icu (Short circuit breaking capacity) as following:
(1) The circuit breaker between the mains power to ATS has 1 set of 800 AT and at
least 800 AF 3 pole with Icu 65 kA at least 380 V or 400 V.
(2) The circuit breaker between the main cable of the generator to ATS has 1 set of
800 AT least 800 AF is at least 65 kA Icu at 380 V or 400 V.
- The automatic transfer switches (ATS) must have a motorized drive and manual switch
to operate without opening the electrical control cabinet with not less than 800 AT 3 poles.
Transfer Switch is equipped with the Icm (Short circuit making capacity) not less than 65
kA IEC 947-3 standards or VDE or UL.
- The controller display must have at least the following:
(1) Volt meter for measuring the voltage of the generator.
(2) Amp meter for measuring the electric current of each phase of the generator.
(3) Power Factor meter can be either analog or digital indicated numbers.
(4) Watt meter for measuring electric power.
(5) Frequency meter can be either analog or digital indicated numbers.
(6) Volt meter and Amp meter for measuring voltage and current a battery.
- The device must be installed inside the cabinets is as following:
(1) Overload current Relay can be set for measuring a current and running time.
(2) Time exercise
(3) Automatic Battery charger
(4) Fuse holders with IEC or UL or VDE standard
(5) Automatic Transfer Switch (ATS)
(6) Microprocessor to controls the operation of generator.
- The control cabinet must have a LED signal light for indicating or warning as following:
(1) An engine failure
(2) Oil pressure is below normal.
(3) Cooling water temperature is higher than normal.
(4) The engine speed higher or lower than normal.
- The control cabinet must have a generator controller as following:
(1) Manual switch
(2) Emergency stop switch.
(3) Automatic switch (Automatic standby).
- A grounding system must be a copper conductor not less than 95 sq.mm. and earth
copper rod with a diameter less than 15 mm in length not less than 2.4 meters.
- A surge protection system as following specifications:
(1) A surge protectors using of LN, LG, LL, and NG are in parallel connection with the
power supply voltage level of 380 volts, single-phase, 2-wire, and a maximum voltage
not less than 110% of Rated Line Voltage.
(2) Response time less than 5 nanoseconds.
(3) The Max. Surge Current / Phase at least 80 kA at 8/20 Microsec and Surge life value
is not less than 3 kA per phase with at least 10,000 impulses.
Control and operation of the system
- When the voltage of the electrical phase either higher or lower than 10% of the normal
operating pressure, the engine control system will be automatically start the generator.
- The engine starting time will be in 1 to 20 seconds.
- If the engine does not start, the Starters will automatically start 3 consecutive times with
every 15 seconds.
- When there is a power failure, the generator set will be started automatically. The control
unit can check the voltage on all phases. The control unit must be ordered to shuffle the
Automatic Transfer Switch (ATS) to supply a power from generator and change the current
direction of in 1-30 seconds.
- When electricity is back to normal, ATS will switch a power supply from main electricity
supply to prevent a flashing or unsterilized power for 1 to 20 minutes.
- After ATS switch back to normal load, the engine will be cooling down period by setting at
1 to 5 minutes.
- The generator can be automatically started every seven days with no load by timer for 1 to 5
minutes.
Installation of electrical wiring
- Before the generator installation, the contractor must submit a plan to install a generator, the
electrical control cabinet, the electrical wiring, and air duct systems of cooling off the
generator room to the outside.
- Wiring will be followed a standard TIS 11-2531 and TIS 293-2541 or proceed as following:
- The cable from the transformer to the circuit breaker is a copper cables and the circuit
breaker for the ATS is a copper bars with 125% resistance rated with no cutting cables and
properly label.
- The cable from the generator to the circuit breaker is a copper cables and the circuit breaker
for the ATS is a copper bars with 125% resistance rated with no cutting cables and properly
label.
- Neutron cable must have not less than 75% of main phase.
- Wiring 160 kW power cable from the circuit breaker to generator to provide backup power
to the load of 200 kVA transformer.
- Wiring cable will be placed in hot dip galvanize pipeline.
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