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Republic of Iraq
Ministry of Electricity
General directorate of electrical energy production –
BASRAH.
E-mail: [email protected]
‫جمهـوريـة العــراق‬
‫وزارة الكهـربـــاء‬
‫المديرية العامة ألنتاج الطاقة الكهربائية‬
‫في البصرة‬
Power Station: Hartha power station
REF NO. 5/2/24/988 S
‫أس‬
‫ الهارثة‬: ‫المحطـة‬
988/24/2/5 : ‫رقم الطلب‬
Excitation System For Unit No. 1&4
Item
1
Qty.
2
Unit
Set
-Supply and installation:
Static excitation system with digital automatic voltage regulator for
synchronous machine and disassemble of old excitation system .
Automatic Voltage
Regulator
The digital type controller consists of control board, analogue/digital
interface board / Tow channel at least.
Monitoring
LCD Monitor for operation /control/interlock
signals/alarm/indication, location in unit control room.
Thyristor rectifier
Converts AC power from excitation transformer to DC field. 3
phase full bridge type.
Withdrawal (tray) type (thyristor elements fitted on removal tray)
If ONE thyristor tray( per phase) put out of service should not
effect on the system
Field breaker
On/off field current and interrupt fault current. DC type breaker is
used.(2Poles)
DC type breaker with discharge resistor (liner type).
Rating: 4000A
Initial excitation
Build up generator voltage to approx. 10KV.
DC power source from external system battery set.
Field discharge circuit
Absorb the energy when opening the field breaker
(FCB).
DC type FCB: discharge contact and resistor. {0.105Ω}
Protection element
Fuse to protect thyristor element from over current, with
alarm
C-R circuit to protect thyristor element from over
Voltage.
Field ground detector, cooler fan.
AVR panel in unit control cubical room
Thyristor panel in turbine power house 1st floor (open Area)
Location
Setting range at Auto. mode
±10% of generator rated voltage
Setting range at Min. mode
10% of rated no load field current/voltage to 120%
of rated field current/voltage at generator rated load
Excitation system for unit No. 1&4
Deliver to: Electric department
Provided that the origin of the: Mitsubishi, ABB, Alstom or Westinghouse.
Item
Qty.
Unit
Voltage accuracy
±0.5% or less
Rating of the one Thyristor
bridge
Ceiling voltage
1000/750/500 Amps
Ambient Condition
Temperature:+55C Humidity: 95%
PT/CT (burden)
2
3
2
Set
PTPT
900V DC
Power source
PT
18KV/110V, 100VA
CT
10000/5A, 100VA ,10P20
Control power: DC 220V
Warranty
Excitation power: Derived from excitation transformer 600V
3ph AC
Initial excitation power:
DC 220V external from DC battery set 1200A/10h
12 Months.
-Digital AVR maintenance tool.
Maintenance tool consist of PC(laptop). and software.
Maintenance tool has following useful features.
Setting of the control parameters
Monitor of the operation .
Monitor failure.
Event /Signal trace.
And all connection and cable.
4
5
-
-
-Spare part:
Spare part 30% from the system
-Training:
Maintenance training for 7 specialists at least 4 weeks in the origin.
-Generator Specification:
250MVA
18KV±5%
8019A, 0.8PF
3ph, 50Hz
3000rpm, 2pole
Star connection
Excitation Voltage: 440VDC
Field Current: 3037A Slip ring
Stator winding per phase (at 75ºC)
: 0.0023 ohm
Rotor winding per phase (at 75ºC)
: 0.1050 ohm
(Unsaturated) (xd)
198%
Negative-sequence reactance (xa)
180%
Zero- sequence reactance
(xo)
13.0%
(xd`)
34.3%
(xd``) 25.8%
-Excitation transformer available, the excitation transformer having the following
specification:
3ph, 3.3MVA
Y∆ / yd1
Pr.: 18KV /106A
Sec.: 600V / 3180A.
-18KV I.P.B From main bus (gen .output) To Excitation transformer are available.
-Power cable from Excitation transformer to Thyristor panel to slip ring are available.
-Estimated Cost = (4000000) $ USD .
NOTE:
Provided that the origin of the: Mitsubishi, ABB(Germany or Switzerland ) , Alstom
(France) or Westinghouse(USA).
‫المدير التجاري‬
‫توقيع المستفيد‬
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