stepup transformer

REVIEWED WITH COMMENTS

DATA SHEET

M006-NN-SE-0-BAT-001

M006-NN-SE-0-BAT-001 Rev 05.doc

Calc.: S. Ricca Verif.: P. Pedro Date: 2009-09-10 of 7

1 RATED CHARACTERISTICS

Item Description Unit

1.1 Equipment Generator Step-up Transformer

1.2 Construction type Shell type

1.3 Number of phases 3

Rated power (Continuous load) K ONAN ONAF1 ONAF2 1.4

At ambient temperature of 33,8ºC and solar

radiation of 1000W/m2

MVA 255 340 425

Rated voltages at no load AT BT

Nominal tap kV 230

Lower tap kV 218,5

Higher tap kV 241,5

19

Type No-load (off-circuit) -

1.5

Tap changer

Tapping range ± 2 x 2,5% -

1.6 Vector group YN d1

Insulation levels HV Neutral LV

Highest voltage for equipment kV 245 36 36

Switching impulse withstand voltage kV

peak

850 - -

Lightning impulse withstand voltage (1.2 / 50 µs) kV

peak

1050 170 170

Chopped wave impulse withstand voltage kV

peak

1155 - 187

Short duration induced AC withstand voltage

(60Hz, 1min)

kV

rms

460 70 70

1.7

Separate source AC withstand voltage kV

rms

70 70 70

1.8 Rated frequency Hz 60

1.9 Standards IEC 60076

2 CONNECTIONS DIAGRAM


DATA SHEET




3 GUARANTEES

3.1 No load losses and excitation current


Percent voltage

100 110

3.1.1 No load losses (a) kW 237 339

3.1.2 Excitation current (a) % 0,25 0,55

3.2 Load losses


Connection (Tap voltage)

230 KW 930

218,5 KW 948

3.2.1 Load losses

(At 425 MVA base, corrected

to 75ºC)

(a) HV

241,5 kW 914

ONAF1 kW 10,5 3.2.2

Auxiliary losses

ONAF2 kW 21

3.3 Impedance voltages


Connection (Tap voltage)

230 % 13,0

218,5 % 13,0

3.3.1 (At 425 MVA base, corrected

to 75ºC)

(a)

HV

241,5 % 13,0

3.4 Temperature rise and noise level


Top oil (by thermometer) ºC 55 3.4.1

Temperature rise

Average winding (by resistance) ºC 60

3.4.2 Sound pressure level at

maximum power rating and

rated voltages

at 1m from prescribed contour dB(A) < 85

(a) - Tolerances according to IEC 600076-1.


DATA SHEET




4 OIL AND OIL PRESERVATION SYSTEM

Item Description

4.1 Oil type Nynas: Nytro Taurus

4.2 Oil preservation system Conservator equipped with rubber cell

One dial type oil level gauge with low and very-low level alarm and trip contacts 4.3 Accessories

One silica-gel dehydrating breather

5 COOLING SYSTEM


Cooling stages ONAN – ONAF1 – ONAF2

Type Hot-dip galvanized plate radiators

Number 36

5.1 Radiators

Mounting Attached to tank though disc valves by groups of 6

Number 72

Manufacturer / reference EFAFLU / VTTF 454/6/27

Flow (free air) m3/h 4400

Speed rpm 1030

Input power kW 0.29

Voltage V 460 ( 3 ph - 60 Hz )

Protection Hot-dip galvanized mesh

5.2 Motor-fan

groups

Mounting Under radiators

Control Top oil temperature and thermal image system 5.3

Voltage V 125 (cc)


DATA SHEET




6 ACCESSORIES


Manufacturer M. Reinhausen

Manufacturer reference DU III 1222 – 72,5 – 06.05.0Y

Type Three-phase no-load (off-circuit) linear switch

Rated current A 1200

Insulation level (lightning

impulse)

kV 350

Number of positions 5

Operation Manual operation by wheel, from ground level

Padlock

6.1 Tap changer

Additional features

Electrical switch for tap position indication

HV Neutral LV

Manufacturer TRENCH TRENCH ABB

Manufacturer reference COT 1050-1600 COT 250-1600 GOH 170/25

Type Condenser Condenser Condenser

Standard IEC IEC IEC

Rated current A 1600 1600 25000

Rated voltage (line to ground) kV 142 30 36

Lightning impulse test voltage

(BIL)

kV 1050 250 200

Minimum creepage distance mm 7595 1300 760

Porcelain colour Brown Brown Brown

Location Tank cover Tank cover Tank cover

6.2 Bushings

Oil level indication Level indicator Level indicator N.A.

Manufacturer Eleq Eleq -

Quantity x Current ratio A 3x1800:1 1800:1 2 x 1800:1 -

Burden 30VA 30VA 30VA

6.3 Bushing current

transformers (per

phase)

Accuracy class 5P20 Cl 0,2 5P20 -

Manufacturer ABB - -

Manufacturer reference EXLIM P192-GV245 - -

Rated voltage kV 192 - -

Max. cont. operating voltage kV 154 - -

Temporary overvoltage (1s) kV 222 - -

Nominal discharge current kA 20 - -

6.4 Surge arresters

Creepage distance mm 7717 - -


DATA SHEET




Accessories (Continued)

6.5 Gas detection relay EMB Buchholz relay

6.6 Sudden pressure relay Qualitrol, ref. 900-003-02

6.7 Pressure relieve device Qualitrol, provided with visual indicator and alarm

contacts, ref. XPRD

6.8 Top oil temperature gauge AKM, with contacts for alarm and trip

6.9 Thermal image system AKM, provided with temperature gauge and contacts for

alarm, tripping and cooler plant control

Weather-proof (IP-55W) control cabinet with all the

devices for operation, protection and control of the

cooling system, provided with heater, lighting and socket.

Draining, filtering and sampling valves

Lifting, untanking and pulling lugs

Grounding pads

6.10 Other accessories and features

External cabling installed in flexible metallic conduits

7 TESTS

Item Description

Measurement of winding resistance

Measurement of voltage ratio and check of phase

displacement

Measurement of short-circuit impedance and load loss

Measurement of no-load loss and current

Switching impulse test on line terminals

Lightning impulse test on line terminals

Separate source AC withstand voltage test (applied

potential test)

Long duration induced voltage test with PD measurement

by radio frequency interference voltage (RIV) method

Accessories functional tests

Physical-chemical oil tests

Routine tests

Vacuum and oil leakage tests

Lightning impulse test on neutral terminal

Short duration induced voltage test

Measurement of zero-phase sequence impedance

Temperature rise test

Dissolved gas in oil analysis (chromatographic analysis)

Audible sound level

7.1 Factory tests

according to

IEC 60076:

Type and special tests

Auxiliary cooling losses measurement

05


DATA SHEET




8 MASS AND OVERALL DIMENSIONS


Complete transformer without oil ton 405

Total oil ton 67

Complete transformer with oil ton 472

Untanking ton 20

Heaviest part for transport ton 115

8.1 Mass

(approx.)

Largest part for transport ton 16

Length m 14,0

Width m 8,8

Height m 8,8

8.2 Overall dimensions

of the complete

transformer

(approx.)

Untanking height m 11,4

Length m 4,0

Width m 3,3

8.3 Shipping dimensions

of the heaviest part

(approx.)

Height m 4,5

Length m 12,4

Width m 4,0

8.4 Shipping dimensions

of the largest part

(approx.)

Height m 2,5


DATA SHEET M006-NN-SE-0-BAT-001

M006-NN-SE-0-BAT-001 Rev 03 - Data Sheet Calc.: S. Ricca Verif.: P. Pedro Date: 2009-04-09 of 9

9 ANEX – NYNAS OIL DATA SHEET


DATA SHEET M006-NN-SE-0-BAT-001

M006-NN-SE-0-BAT-001 Rev 03 - Data Sheet Calc.: S. Ricca Verif.: P. Pedro Date: 2009-04-09 of 9


stepup transformer

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