Technical data of alternator of the 9x2MW diesel generator set from China
- Rated output kVA 2500 KVA
- Power factor 0.8 lag
- Max. Alternator output at site 2000 KW
- Duty Continuous
- Rated speed 600 RPM
- Rated voltage 6600 V
- Rated Current 218.75A
- Excitation Voltage Fundamental 100V
Harmonic 100V
- Excitation Current Fundamental 6A
Harmonic 3.5A
- Efficiency at 100% load and 0.8 PF �?0.7 %
- Direction of rotation clockwise
- Number of poles 10
- Rated frequency 50 Hz
- Over-speed 20% for 2 minutes
- Overload capacity and duration 10%, for max. 1 hr in every 12 hrs
- Insulation class F
- Enclosure IP 23
- Temp. rise class F
- Excitation and AVR type Brush-less, AVR
- Connection Star
NOTE
Alternator design considers harmonics in load.
4.2 Governor system for DG
Woodward 2301D digital control and UG15 actuator are adopted for load sharing and speed control of diesel generator.
The 2301D is a microprocessor-based digital control. The control is housed in a sheet-metal classis and consists of a single printed circuit board. The 2301D is configured using a computer with Woodward Watch Window software. The computer connects to the 2301D through a 9-pin connector (RS 232 port). The control operates from a 24Vdc supply. The actuator output, one analog input, and one analog output are configurable. The 2301D features dual dynamics and soft load transfer, to and from a bus. The 2301D includes one load sensor circuit, one actuator driver, one MPU speed sensor, one configurable analog output, one configurable analog input, eight discrete inputs and four discrete outputs. The 2301D operates within a range of �?0 to +70�?
The 2301D provides load sharing and speed control of diesel generator. The 2301D has four operating modes �?speed control, isochronous load sharing, droop base load, and isochronous base load.
Woodward UG-15 is a hydraulic powered electric actuator. The UG-15 provides the muscle for 2301D. The UG-15 takes a given electrical input signal and converts it to a proportional hydraulic output-shaft position to control engine flow.
4.3 Oil storage
There are two 1000m3 HFO storages, two 100m3 buffer HFO tanks, one 300m3 DO storage, one 50m3 daily HFO tank, one 50m3 daily DO tank and one 50m3 sludge oil tank. HFO separator double module and fuel pumps are installed in the separator and pump room.
Heavy fuel oil transported by fuel truck (about 30 ton) will be pumped to two HFO storages and two buffer HFO tanks. Two HFO transfer pumps are installed in the room, one is for standby. Filter and flow meter are also installed before the HFO transfer pumps. HFO in the two HFO storages can be transferred to the buffer HFO tanks by the two pumps.
Diesel oil transported by fuel truck (about 30 ton) will be pumped to DO storage and daily DO tank. Two DO transfer pumps are installed in the room, one is for standby. Filter and flow meter are also installed before the DO transfer gear pumps. DO in DO storage can be transferred to the DO daily tank by the two pumps.
For all HFO storages and tanks and sludge tank, steam coil pipes are installed inside and thermal insulations are provided outside.
Fuel temperature in HFO storage is recommended to be 50-60 centigrade degree, fuel temperature in buffer HFO tank to be 70-80 centigrade degree. The buffer HFO tanks are used for pre-separation of sludge and water contained in HFO and providing a suitable constant HFO temperature. Gravitational settling of water and sediment in HFO is an extremely slow process due to small density difference between HFO and the sediment. A large fuel oil surface area and a low viscosity are needed for the settling process. The volume of each buffer HFO tank is 100m3, which is enough for 24 hours continuous operation at rated load.
HFO in buffer HFO tank will be pumped to the separator double module. The separating capacity for each separator unit is 3000 kilogram one hour. When two separators work together, the separating capacity is 6000 kilograms one hour. For whole power plant, the maximum HFO consumption one hour is about 3000 kilograms. The clean HFO will be pumped to daily HFO tank, and the sludge oil will be pumped to sludge oil tank through the sludge oil pump installed on separator module.
Heavy fuel oil in daily HFO tank and diesel oil in daily DO tank will be pumped to booster module in generator main building.
4.4 Fuel Circuit system
4.4.1 Type of fuel:
The engines are suitable for operation on DO (Diesel Oil) / HFO (Heavy Fuel Oil or Furnace Oil with maximum viscosity 380 cSt at 50 deg. C.);
When starting or stopping the engine DO (Diesel Oil) is used as fuel. When the water temperature at inlet to engine exceeds 60 degree centigrade, and the HFO (Heavy Fuel Oil) is heated to the required temperature, the fuel can be changed from DO to HFO through a changeover oil tank.
Equipment fitted on the engine:
- Individual fuel injection pump for each cylinder with fuel rack & linkages.
- Individual injector fitted on each cylinder head.
- High-pressure injection pipes
- Main fuel rails for feeding and return.
- High-pressure pipe connection for each cylinder
Equipment delivered loose:
1) One HFO separator double module
2) One fuel viscosity control module (booster) consisting of:
Two electric motor driven fuel feed pump (one for working, one for standby);
Two electric motor driven fuel booster pump (one for working, one for standby);
One duplex type coarse filter;
One pressure-regulating valve;
One steam heater for HFO;
One flow meter for HFO;
One 3 way fuel changeover valve;
One viscosimeter & temp controller;
One emergency pressure safety valve;
One duplex type fine filter;
one mixing vessel with safety valve;
One pressure-regulating valve in fuel return;
3) Complete interconnecting piping with flanges, fasteners, valves, non-return valves, bosses, supports, etc as necessary.
Fuel consumption:
The hourly rate of fuel consumption per Kilowatt Power delivered at the crankshaft flange at rated power & speed (after running in of the engine & for engine with driven raw water, fresh water & lube oil pumps) is 198g/kWh, when engine operates at Maximum Continuous Rating (MCR).
FUEL CONSUMPTION (with 3 driven pumps)
====================================================
G8300ZD8 Consumption at
(600 RPM) engine Cr.shaft
g/kWh
====================================================
100% Load 198.00
SITE -----------------------------------------------------------------------------
75% Load 202.00
CONDITION-------------------------------------------------------------------------
50% Load 211.00
====================================================
The values are subject to a 3% tolerance and apply when burning fuel with a net calorific value of 10,200 KCal/Kg minimum.
CLIMATIC CONDITIONS
ISO Conditions
Air temp. to turbocharger inlet 25 deg. C
Atmospheric pressure 750 mm Hg
Relative humidity 60 %
Water temp. at charge air cooler inlet 25 deg. C
Site Conditions (Assumed)
Air temp. to turbocharger inlet 45 deg. C
Atmospheric pressure 750 mm Hg
Relative humidity 60 %
Water temp. at Radiator outlet 52 deg. C
The heavy fuel oil from daily HFO tank and diesel oil from daily DO tank will be pumped to the mixing vessel on the booster module through two fuel feed pumps. After heated by steam, the heavy fuel oil (or diesel oil) with constant viscosity about 12-15 cst will be pumped to fuel main pipe. The booster module is used for controlling viscosity and supplying fuel for generators, its fuel-supplying capacity is 5000 kilograms one hour (Maximum feed capacity is 10000kg one hour, return oil is 5000kg one hour).
Return oil from each generator will back to the mixing vessel through return main pipe.
Fuel change between HFO and DO can be achieved through the 3-way valve on booster module, but this kind of fuel change is suitable for all generator at the same time.
For changing fuel on one individual generator, two DO transfer gear pumps are installed in the main building. Start one of the two pumps, open the DO valve and close the HFO valve on changeover oil tank beside the generator, fuel for the generator will be changed to diesel oil.
4.5 Lube oil circuit system
Oil sump capacity (ltr)
The engine is equipped with a dry sump attached to the bottom of the crankcase. The lube oil for the engine is stored in a separate tank positioned away from the engine. This arrangement offers much more reliability than the wet sump arrangement & also increases the time between oil changes by lube oil separator module.
The total oil capacity of this lube oil tank is 2000 ltrs.
Lube oil consumption
The average lube oil consumption is 2 g/kWh (+/- 0.2 g/kWh) at MCR at crankshaft for a well-run engine.
One lube oil separator module is arranged for three generators, total in the main building are three lube oil separator modules. Lube oil separator is used for cleaning lube oil and prolong usage time.
Equipment fitted on the Engine:
- One engine driven lube oil supply pump
- One engine driven lube oil transfer pump
- One pressure-regulating valve
- One lube oil thermostatic valve (option)
- Complete interconnecting piping with flanges, fasteners, valves, non-return valves, bosses, supports, etc as necessary.
Equipment delivered loose:
- 9 tanks for lube oil (2000 ltrs capacity) with interconnections to the engine
- 9 electric motor-driven lube oil-priming pumps
- 9 manual lube oil-priming pumps
- 9 lube oil coolers
- 9 centrifugal lube oil filters (FLL75 bypass type)
- 9 lube oil duplex type filters
- 3 lube oil separator modules
- Complete interconnecting piping with flanges, fasteners, valves, non-return valves, bosses, supports, etc as necessary.
4.6 Starting air circuit system
The DG is started by the compressed air.
Four air compressors and six air receivers are arranged for the power plant, the capacity of each air receiver is 500 liters, which is enough for starting one generator 7 times without intermediate refilling of the receiver.
High-pressure compressed air about 3 Mpa from the air receivers will be sent to 9 generators through air main pipe, and also be sent to exhaust gas boilers for cleaning chimney, to lube oil separator modules, HFO separator modules and booster modules through pressure reducers for control air.
Equipment fitted on the engine:
Compressed air starting equipment including:
- One rotary distributor
- One air-starting valve in each cylinder head
- Connecting air piping on the engine
Equipment delivered loose:
- Four air compressors
- Six air receivers
- Complete interconnecting piping with flanges, fasteners, valves, bosses, supports, etc as necessary.
4.7 Cooling water circuit system
Radiator made by GEA is arranged for each generator, and an electric water pump is arranged for the water circuit system.
Drawn by the electric water pump from the radiator, the cooling water flows to the air cooler, and to the injector cooling oil cooler and to the lube oil cooler, and then enters the inlet water main pipe and the turbocharger. The cooling water is discharged out through the outlet water main pipe. Finally the water is cooled in the radiator.
Equipment fitted on the engine:
- One lube oil cooler
- One injector cooler
- One water-cooled charge air cooler
Equipment delivered loose:
- 9 radiators (outdoor, GEA)
- 9 electric water pump
- Complete interconnecting piping with flanges, fasteners, valves, bosses, supports, etc as necessary.
4.8 Intake air and ventilation system
The air intake system is equipped with air filtration (ABB type installed on the engine) to clean air.
For 9 diesel generators, air consumption is 112500m3/h. 9 axial-flow explosion-proof fans opposite to each generator are arranged for the main building on the engine side. Airflow capacity for each fan is 15870m3/h; total airflow capacity is 142830m3.
The axial-flow fans are used for supplying air for the generators and reducing temperature in the engine room through convection. The quantity of heat dissipated from the generators is about 3780 MJ/h. The air will be discharged through natural ventilation on the upper side of the main building.
4.9 Exhaust gas and environmental impact mitigatory system
Air pollution prevent
All diesel engines for the power plant are acquired international air pollution prevent certificate according to the provisions of Annex �?of the international Convention for the Prevention of Pollution, 1973, as modified by the Protocols of 1978 and 1997 relating thereto and of the Technical Code on Control of Emission of Nitrogen Oxides From Marine Diesel Engines.
Emission data as follows:
Applicable Nox emission limit (regulation 13 of Annex �?: 12.5g/kWh
Engine’s actual Nox Emission Value: 9.69g/kWh
Noise
The mechanical noise beside the diesel engine at a distance of 1 m is 112 dBA. The mechanical noise will be proofed and reduced by the main building.
The exhaust gas noise is reduced through a residential type silencer to 70dBA at a distance of 1 m.
The exhaust gas from diesel generator flows to exhaust gas pipe (DN400), pass a tee joint, and then divides two ways. One flows to silencer through a butterfly valve, another flows to exhaust gas boiler. When the exhaust gas boiler works, the butterfly valve for silencer will close and the butterfly valve for exhaust gas boiler will open, and then exhaust gas will vent from the chimney on the boiler. When the boiler cannot work normally or the boiler need to be stopped, the butterfly for boiler will close and the butterfly valve for silencer will open, and then exhaust gas will vent from the chimney on the silencer.
Three steam exhaust gas boilers are arranged for the power plant, each one will connect with three diesel generators. One exhaust silencer (Residential type) is fitted to the each generator.
Equipment fitted on the engine:
- Lagged set of exhaust manifold with expansion bellows
- One ABB turbocharger.
- Exhaust outlet connection with expansion bellow.
Equipment delivered loose:
- 9 exhaust silencers
- 3 exhaust gas boilers
- Insulation /lagging/cladding for exhaust ducting
- Complete interconnecting piping with flanges, fasteners, t-joints, butterfly valves, bosses, supports, etc as necessary.
4.10 Steam system
Three exhaust gas boilers are arranged on the roof of control room. Heat exchange area for each boiler is 112 m2, steam capacity for each boiler is 1000kg one hour at 170 degree centigrade and 0.7 Mpa. Steam from boilers will flow to steam main pipe and divide to separator and pump room, oil storage and main building through main steam distributor and steam distributors. The main steam distributor is located on the roof of control room, and other steam distributors are located beside the equipments need to be heated.
Drain trap is arranged on the end of steam pipe for equipment need to be heated, condensation water will be recycled through condenser.
Equipments for steam system:
- 3 exhaust gas boilers
- 6 water feed pumps
- 4 Steam distributors
- 1 hot water tank
- 1 condenser
- 1 air cooler for condensation water
- Pumps for the water recycle system
- Insulation /lagging/cladding for steam pipes
- Complete interconnecting piping with flanges, fasteners, t-joints, valves, bosses, supports, etc as necessary.
4.11 Water soften system for exhaust gas boiler
One water soften equipments are arranged for the power plant, water treatment capacity is 2000kh one hour.
The water soften equipment adopts resin exchanger treatment system.
Equipments for water soften system:
- 1 water soften equipment
- 2 water feed pump
- One water tank
- Complete interconnecting piping with flanges, fasteners, valves, bosses, supports, etc as necessary.
4.12 Oil and water waste disposal system
Oily water will be collected in an oily water pond through water channel in the power plant. An oily water separator module is arranged to separate oil from the oily water. The oily water treatment capacity for the separator module is 5 cubic meters one hour. The oil content for the treated water is 10 ppm, and can be drained directly. The oil separated from the oily water will be collected in the sludge oil tank.
4.13 Electrical system
4.13.1 H.V. system
The 9 2MW/6.6kV HFO generators will work in parallel and supply electricity to one 6.6KV bus-bar, and feed to outgoing panels to customer’s workshop.
One 800kVA station transformer is used to supply 400V source for the power plant.
One 400KW diesel generator is supplied as power when the whole power plant is stopped.
6.6kV generator system
9 2MW/11kV diesel generators are arranged for the power plant. For each one generator, the standard configure includes one switchgear for generator output and potential transformer, one control and operation panel (COP) and one local control desk (LCD).
The neutral of the generator is earthed through surge arrestors.
All 9 generators are connected with a single bus-bar. A 6.6kV bus-bar PT panel is arranged for parallel operation. All 6.6kV H.V. panel adopt KYN28A-12 metal-enclosed removable switchgears, the switch for generator switchgear adopts VS1 vacuum circuit breaker (with truck), its rated current is 630A, and rated short-circuit breaking current is 31.5KA.
Generator HV panels
The generator connects to the bus-bar by vacuum circuit breaker in the generator switchgear.
Major Components in generator switchgear:
1) 3 pole truck type DC/AC 220V electrically operated motor energized VS1 Vacuum Circuit Breaker
2) Metering / Protection CT and PT
CT type: CT LZZBJ9-6.6 200/5A with two windings for each phase
Two CTs are installed in the generator switchgear. One CT is for current and power measuring (phase A and C) and excitation adjusting (phase B); another is for 2301D load sharing controller.
PT type: one REL-6.6 with two windings for each phase
One group of windings in potential transformers is star connected for measuring and protection system. Another group of windings is triangularly connected for single phase earthing protection.
3) Digital integrated relay
DMR-362 digital integrated relay is adopted for gen-set protection, which is used for alternator protection, switch control, monitoring, measuring and display.
The following functions and protection can be carried out on the relay:
- Differential
- Voltage locked over current
- Reverse power
- Over current
- Single phase Earthing
- Over voltage
- Low frequency
- Over frequency
- Over load
- Accurate measuring of all operation parameters such as power, voltage, current, frequency, power factor and others
- Display the conditions of all switches
- Running record and failure storage
4) Local / Remote control selector
5) VCB ON/OFF
6) DSSX25 kWh and kVarh meter
Potential transformer panel
Major Components in PT panel:
1) Fixed PT installation truck with arrester.
2) PT type: one REL-6.6 with two windings for each phase
One group of winding in potential transformers is star connected for measuring and protection system. Another group of winding is triangularly connected for single phase earthing protection.
4.13.2 L.V. system
The L.V. electrical systems consist of auxiliary electrical system for generator, auxiliary electrical system for power plant, lighting system, fire fighting system and maintenance system.
The auxiliary equipments for generator include 9 radiators (33KWx9), 4 air compressor motors (5.5kWx4), 3 lube oil separator motors (2.2kWx3), 1 booster (7.5kW) and one DC power source panel (4kW).
The auxiliary equipments for power plant include 2 HFO pump motors (18.5KWx2), 2 DO pump motors (18.5KWx2), 1 HFO separator double module (24kW), 6 boiler water feed pump motors (2.2kWx6) and one soft water pump motor (3kW).
The lighting and air conditioner system is about 30kW, all lighting equipments are considered during civil work.
The fire fighting system includes 2 fire-fighting pumps (22kWx2) and one water feed pump (7.5kW). All fire-fighting equipments are considered during civil work.
The maintenance system includes one 10T double girder bridge crane (10kW) and maintenance electrical boxes (total 50kW).
4.13.2.1 L.V. power source for power plant
Two L.V. power sources are arranged for power plant. One is supplied with a station transformer (800KVA/6.6kV/0.4kV), another is supplied by a emergency diesel generator (400kW/0.4kV) when the whole power plant is stopped.
4.13.2.2 Emergency generator
The diesel generator is used as emergency power source for the power plant.
4.13.2.3 DC panel
The power supply of control plant, protection, signal, automatic device and trouble lighting adopts 200AH direct current electrical source system.
220/24V DC battery charger of suitable capacity along with Lead acid type rechargeable batteries (12 V DC) is used. Charger is fully automatic, with float and boost charging facility. One set of DC/DC transfer module with 60A capacity for 24V output.
Major Components in the DC panel
1) Source inspect and change over module
2) Chargers and booster module
3) 12V batteries and battery detect unit
4) AC/DC ammeters, voltmeters
5) LCD operation screen
Protections provided for Chargers
6) Over load / short circuit / earth fault
7) Over voltage
4.13.3 Control system
4.13.3.1 DG
For each one generator, one control and operation panel and one local control desk are supplied.
Gen-set control and operation panel
The control and operation panel in the control room provides necessary Monitoring, Control and Protection functions for the DG set. It controls the Gen-set running according to the program set in PLC. All Gen-set’s running parameters such as voltage, current, power, power factor, frequency, and speed can be displayed on it.
Major Component in console
1) Control PLC
2) Speed Governor controller
3) Automatic Voltage Regulator
4) Engine Frequency Monitoring Unit
5) Meters
Ammeters (3 nos.)
Voltmeter with selector switch
Power meter
Frequency meter
PF meter
Analog Excitation fundamental ammeter
Analog Excitation harmonics ammeter
Counter for running hours
6) Operation and indicators
Push buttons, change over switches
VCB engaged indication,
Engine start permission indication
Excitation change over switch
DG VCB ON/OFF
DG VCB Trip and alarm indication
Engine Idling/Rating
Eng, , , , ine start
Engine normal and emergency stop
7) AVR
The integral TWL-ND AVR is designed for the TFW generator specially. It configures with stability adjusting, voltage adjusting, and gen-set paralleling reactive power sharing adjusting.
Input capacity AC 230V
Compare voltage AC 100V from PT AC
Current signal CT 5A from CT B
Max. Output DC.100V, 10A
Trigger Type Alternator exciter Remanence
Accuracy ±1%
Am. Temp -40~+60�?/FONT>
Reactive sharing Auto regulating
8) T4500 auto synchronizer
SELCO T4500 auto synchronizer is designed for automatic synchronization between generator and bus-bar in a minimum of time by controlling the speed via the electric servomotor on the governor.
The T4500 measures the voltage across two phases on either side of the circuit breaker in order to obtain data on voltage, frequency and phase difference for closing the circuit breaker at exact phase accordance.
The synchronization function will become active when the difference between the bus voltage and the generator voltage is within limits. The voltage difference is selectable between 2% to 10%.
When the synchronization function is active, the T4500 will automatically adjust the speed of the generator through the governor in order to match the frequency to the bus-bar.
The T4500 will continuously adjust the generator speed until the frequency difference is within limits. When the voltage and frequency difference are within limits, the closing signal will be activated just before the next phase accordance, anticipating the circuit breaker make time. The T4500 compensates for this make time so that the circuit breaker will close exactly at zero phase.
Specifications for the T4500:
Circuit breaker operating time 20~200mS
Frequency difference 0.1~1Hz
Voltage difference 10%
Reference voltage 110/100V with voltage matching
Operating Temp -20~+70�?/FONT>
Contact rating AC: 380V, 2A, 250VA; DC: 110V, 2A, 100W
Auto synchronization system is adopted between generators and network and among generators. Manual synchronization system is supplied for standby.
9) Load sharing
All generators can work in parallel; load can be equally shared among all generators automatically. Woodward programmable and configurable speed governor controller 2301D are adopted to control the engine, which can share or operate Gen-set in base load mode or isochronous mode.
Main functions on the control and operation panel:
- Starting engine
- Speedup
- Speed-down
- Generator switch ON/OFF
- Voltage adjustment
- Reactive power share
- Synchronization
- Voltage measuring changeover
- Lube oil pressure
- Water pressure
- Voltage
- Current
- Frequency
- Power
- Excitation current
- Speed
- Alarm
Local Control Desk
Local Control Desk is provided for monitoring pressure and thermal parameters of the running engine. Also starting, stopping and speed control of engine is possible in local control operation mode. It is located near the engine.
Major Components in Local Control Desk
1) Pressure gauges, switches
Lube oil filter inlet pressure
Lube oil filter outlet pressure
Lube oil in cylinder head inlet pressure
Cooling water pressure
2) Temperature indication
Cylinders cooling water temperature scanner
Cylinder cooling water outlet temperature measurement system with Cu50 thermo resistor for each cylinder and scanned by a multi-channel meter.
Engine exhaust temperatures scanner
Pyrometric exhaust gas system with thermocouple for each cylinder and turbocharger, and scanned by a multi- channel meter.
Lube oil engine inlet /outlet temperature
Water engine inlet/outlet temperature
3) Engine RPM indicator with cranking and over speed protection.
4) Push buttons, indicating lamps, selector switches
- Common engine alarm
- Engine start permission
- Local / remote mode select
- Engine start / stop
- Flasher off
- Engine speed raise / low
- Emergency stop
4.13.3.2 Central control panel
A central control panel is installed in the control room, which is used for displaying signals for auxiliary equipments including oil storage level alarm, water level alarm, oil temperatures, steam pressure and others.
4.13.4 Protection system
4.13.4.1 Diesel engine
The diesel engine will stop automatically in case of the following failures:
- Very low lube oil pressure
- Very high water engine outlet temperature
- Engine over speed
The diesel engine will alarm automatically in case of the following failures:
- Low lube oil pressure
- Low water pressure
- High lube oil temperature
- High water temperature engine inlet
- Alternator bearing temperature high
4.13.4.2 DG electricity system
The generator adopts digital integrated relay protection system for monitoring and protection.
A DMR362 digital integrated relay is installed on generator switchgear, which is used for alternator protection, switch control, monitoring, measuring, display and SOE record.
The following functions are configured on the relay:
- Differential current
- Reverse power
- Instant trip current
- Voltage locked over current:
- Over current
- Over load
- Earth failure
- Over voltage
- Under voltage
- Low frequency
- Over frequency
4.13.5 Lighting system
Lighting (inside of main building)
The power plant adopts the lighting system as follows:
l Normal AC lighting system
l The direct current trouble lighting system
l The safety lighting
l The guard lighting
Normal AC lighting system
The normal AC lighting system provides whole the lighting of power plant. The normal AC voltage is 220 V.
The direct current emergency lighting system
One set of switch panel is installed in the control room. Usually the AC electrical system work for illuminate system. When the system breaks down, it will automatically switch to direct current emergency lighting system. At the important place & exit/entrance of main building and subsidiary workshop far away from the main building, the lighting system adopts emergency lighting with the storage battery, with power supply time no less than 30 minutes. The AC electrical source of the emergency lighting connects to the normal lighting network.
The safety lighting
At special situation, it should adopt 36V safe voltage power supply.
The guard lighting
The plant warning light will be installed on the control room and main building.
4.13.6 Fire fighting system
The fire extinguishing water, industrial water and living water are united and independently to be supplied.
In the power plant, the annularity main water supply pipe for fire fighting and hydrants are arranged.
Enough fire extinguishers are arranged in the main building and other buildings.
The drain will be collected to a main pipeline through branch pipes, and discharged by the buried channel.
The fire fighting (living) water pumps are all arranged in the pump room. The fixed hydrants in the main building are of wall hanging type; the hydrants out of the main building are arranged along the main road. The fire extinguishers are arranged in the different rooms.
Annular fire fighting passages are arranged for all buildings in the power plant. The width of the main fire fighting passage is 8 m, which is sufficient for fire truck to arrive all buildings in the power plant.
Fireproofing wall with height of 1.6 m is arranged around the oil storage. Auto fuel leakage alarm equipments and power fire extinguishers are installed in all fuel filling places.
Flameproof materials are used for the buildings in the power plant, and the flameproof class of materials is up to class two (Chinese standard) and flameproof endurance is 1.5 hours.
Fire fighting is considered for all electric system, lighting equipments all adopt explosion-proof equipments.
4.13.7 Earthing and lighting strike protection
Earthing system of the project includes lighting strike proof earthing for oil storages, construction building, and earthing for LV & HV electric equipments.
Lighting strike proof earthing for oil storages
On the roof of HFO storage, lightning arrester is arranged for direct thunder-strike protection, the earthing system connects to the ground with nature fully by earthing bars, and the resistance is less than 1 Ohm.
Lightning proof earthing for construction building
On the roof of the main building, lightning arrester is arranged for direct thunder-strike protection, the earthing system connects to the ground with nature fully by earthing bars, and the resistance is less than 1 Ohm.
Earthing for LV & HV electric equipments
The earthing system connecting to the ground with nature fully by earthing bars, and the resistance should be less than 1Ohm. Except that, the earthing system connects to the vertical man-made object to complete a close-circularity network. It avoids the grounding, contacting and stepping over-passing the permission range. The earthing material is satisfied to the request for conducting, antisepsis and short-circuit heat stabilize. The horizontal earthing object adopts 40x4 flat steel of hot galvanized steel, and the vertical earthing bars adopt L50X5 hot galvanized angle bar or Φ50 hot galvanized steel pipe. For thunder-stroke wave overload voltage endangering, the generating system has set zinc lightning arrester on the H.V. bus-bar.
All metal shells of electrical equipments are connected to the PE line reliably to avoid electrical shock when the insulation of the equipment is failure.
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