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5x2MW HFO power plant project design specifications part 2
4.10 Electrical system
4.10.1 H.V. system
Five 2MW/11kV HFO generators will work in parallel, supply electricity to one 11KV bus-bar and feed out through one outgoing panel.
11kV generator system
Five 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).
All five generators are connected with a single bus-bar. An 11kV bus-bar PT panel is arranged for parallel operation. All 11kV 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 25KA.
The generator bus-bar connects to one outgoing panel. The switch adopts VS1 vacuum circuit breaker (with truck), its rated current is 1600A, and rated short-circuit breaking current is 31.5KA.
Generator switchgear
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 LZZBJ9-11 200/5A 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 load sharing controller.
PT type: one REL-11/�?. 0.1/�?. 0.1/3kV 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
11kV outgoing panel (feeder)
Major Components in switchgear:
1) 3 pole truck type DC/AC 220V electrically operated motor energized VS1 Vacuum Circuit Breaker.
2) Metering / Protection CT
CT type: CT LZZBJ9-11 1600/5A with two windings for each phase
One group for current difference protecting between transformer’s input and output; one for current protection and power measuring
3) Digital integrated relay
DMR-301 digital integrated protection relay is adopted for transformer protection, and its protection parameter and function are configurable. The relay can indicate all parameters and store operation and accident record for the running transformer.
The following protection can be carried out on the relay:
- Differential current
- Instant trip current
- Over current
- Over load
- Gas
- High Insulation oil temperature
- High Insulation oil pressure
4) Local / Remote control selector
5) VCB ON/OFF indication
6) DSSX25 kWh and kVarh meter
11kV Incoming panel for station transformer
Major Components in switchgear:
a) 3 pole truck type DC/AC 220V electrically operated motor energized VS1 Vacuum Circuit Breaker.
b) Metering / Protection CT
CT type: CT LZZBJ9-11 50/5A with two windings for each phase
c) Digital integrated relay
DMR-301 digital integrated protection relay is adopted for protection, and its protection parameter and function are configurable.
The following protection can be carried out on the relay:
- Differential current
- Instant trip current
- Over current
- Over load
d) VCB ON/OFF indication
e) DSSX25 kWh and kVarh meter
f) Fixed PT installation truck with arrester.
PT type: one REL-11/�?. 0.1/�?. 0.1/3kV 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.
4.10.2 L.V. system
A LV auxiliary panel is supplied for all auxiliary equipments including air compressors, radiators and water pumps, fuel unloading stations, HFO treatment equipment and others.
The L.V. electrical systems consist of auxiliary electrical system for generator, auxiliary electrical system for power plant.
The auxiliary equipments for generator include 5 radiators (33KWx5), 5 water pumps (15kWx5) and 3 air compressor motors (5.5kWx3).
4.10.2.1 L.V. power source for power plant
The electricity for the power plant is supplied by a 500KVA transformer from the 11kV bus-bar.
4.10.2.2 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
4.10.3 Control system
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
Engine 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�?/DIV>
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�?/DIV>
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
4.10.4 Protection system
4.10.4.1 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
4.10.4.2 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
4.10.4.3 11kV electrical system
One DMR301 digital integrated relay is installed on the outgoing panel, the following functions can be carried out on the relay:
- Over current
- Instant current trip
- Running record and failure store
- Controlling switch on site or on remote mode
5. Main equipments specifications
5.1 Diesel engine:
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Model |
GN8320ZD |
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Type |
Inline, four-stroke, direct injection, turbocharged, and after cooled |
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Quantity |
5 sets |
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Rated power |
2206kw |
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Rated speed |
600r/min |
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Bore/stroke |
320/380mm |
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Starting method |
Compressed air |
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Cooling system |
Open water cooling |
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Dimension |
5620x1620x2760mm |
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Weight |
31000kg |
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Manufacturer |
NB ZhongceDongl1 Co., Ltd |
Main parts of GN8320ZD Diesel Engine
a. ABB turbocharger
b. GEA after cooler, lube oil cooler
c. Flexible coupling
5.2 Alternator
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Model |
TFW-2000 |
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Type |
Brush-less synchronous alternator |
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Quantity |
5 sets |
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Rated power |
2500KVA |
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Rated speed |
600r/min |
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Rated voltage |
11000V |
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Frequency |
50HZ |
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Power factor |
0.8 lagging |
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Insulation class |
F/F |
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Excitation |
AVR |
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Weight |
16000kg |
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Manufacturer |
NB ZhongceDongl1 Co., Ltd |
5.3 Air compressor
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Model |
CZ-20/30F |
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Type |
Single row vertical, differential piston two-stage compression, air cooled |
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Exhaust capacity |
Min. 20m3/h |
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Quantity |
3 sets |
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Rating pressure |
3MPa |
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Cylinder bore |
1st stage: 102mm, 2nd stage: 90mm |
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Piston stroke |
65mm |
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Exhaust temperature |
Max. 85�?/DIV> |
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Rotary speed |
1000r/min |
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Shaft power |
<5kW |
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Motor |
Y132S-6/5.5kW |
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Overall dimensions |
970x440x700mm |
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Weight |
155kg |
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Manufacturer |
NB ZhongceDongl1 Co., Ltd Group Co., Ltd |
5.4 Air receiver
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Model |
B500/3.24 |
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Quantity |
4 sets |
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Air inlet & outlet |
�?3 |
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Design pressure |
3.24MPa |
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Working pressure |
2.94Mpa |
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Max working temperature |
�?0�?/DIV> |
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Volume |
500L |
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Manufacturer |
NB ZhongceDongl1 Co., Ltd Group Co., Ltd |
5.5 Radiator
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Model |
3VI1250 H12 - 6150/2117 - 2CA2 S32D302 (HT) + 6CA4 S32D212 (LT) |
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Quantity |
5 sets |
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Heat transfer |
423.8kW for HT, 428.6kW for LT |
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Medium |
Water |
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Mechanical power |
11kWx3 |
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Fan speed |
960rpm |
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Sound level @ 2 m |
85.6 ±3 dB(A) |
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Manufacturer |
NB ZhongceDongl1 Co., Ltd Group Co., Ltd |
5.6 S9-500/11/0.415 Station transformer
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Model |
S9-500/11/0.415 |
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Rating |
500KVA |
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Primary Volts |
11KV |
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Secondary volts |
0.415KV |
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Insulation level |
Standard |
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Quantity |
1 set |
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Manufacturer |
NB ZhongceDongl1 Co., Ltd Group Co., Ltd |
5.7 Station batteries and battery charger panel
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Model |
PGD7-�?180-220 |
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AC input voltage |
380Vac±20% |
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DC output voltage |
24V, 220V |
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DC output current |
A |
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Storage battery capacity |
300Ah |
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Accuracy of voltage regulation |
Max. ±0.2% |
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Accuracy of current regulation |
Max. ±0.2% |
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Ripple factor |
Max. 0.1% |
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Power factor |
Min. 0.93 |
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Efficiency |
Min. 95% |
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Noise |
50dB |
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Dielectric strength |
2000V 1 min without breakdown |
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Operation environment |
Temperatur:-10 to 45�? Relative humidity：not greater than 90% at 20±5�?/DIV> |
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Interface |
RS485, RS232 & RS422 |
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High frequency rectifier module |
Emerson HD22020 3pcs |
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PLC |
SIEMENS S7-200 |
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LCD display screen |
HITECH PWS 5.7�?/DIV> |
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Rectifier module |
Emerson HD2205 3pcs |
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Maintenance-free lead-acid battery |
A400-180/12V 18 pcs |
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Overall dimensions (LxDxH) |
800x800x2200mm 3pcs |
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Manufacturer |
Zhej Sanche Eletl Co. Ltd. |
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