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POWER TRANSFORMERSTechnical Information

P a r t n e r s i n P o w e r

Leistung12S. engl. 9/02 19.09.2002 13:08 Uhr Seite 1

Tailored to your requirements

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You can count on our quality

Up to the minute core-laying technology(step lap) and the application of high quality, extremely low loss sheet steelwith low magnetism, guarantees thecustomer low no-load losses and noiseemissions.

Short-circuit lossesThanks to the optimisation of the conductor cross sections, low-load losses can be achieved in relation to theadditional losses. As a result, SGB trans-formers completely meet the technicalas well as the economical requirementswith regard to short circuit proofing.

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No-load losses / Noise Products

• Power transformers from 5 to 100 MVAup to Um 170 KVONAN / ONAF / OFWF16 2/3 Hz / 50 Hz / 60 Hz

• Oil chokes • Neutral electromagnetic coupler• Earthing transformers and Peterson coils• Single phase transformers• Resonant circuit reactances• Coupling transformers and reactors for

ripple control• Shunt reactors and current limiting

reactors• Transformers with line drop and parallel

regulation• Rectifier and furnace transformers

Repair• All types of transformers > 5 MVA • Manufacture of complete spare parts

MaintenanceProvider of services for everything to dowith transformers

Quality managementThe complete operational process is controlled by a tried and tested qualitymanagement system

The SGB Group is certified in accordancewith • ISO 9001• Federal railways welding authorisation• KTA 1401

MarketsThe SGB group manufactures and teststransformers for the world market.

We comply with the standards of:• DIN / VDE • UL• IEC 76 • ENEL• British standard • ÖVE• ANSI / IEEE • SVV• CAN / CSA • UNE• NEMA • NF• and others

50

45

40

35

30

25

20

15

10

5

12,5 16 20 25 31,5 40 50 63 80 100 120 140 0

12,5 16 20 25 31,5 40 50 63 80 100 120 140

400

350

300

250

200

150

100

50

0

12,5 16 20 25 31,5 40 50 63 80 100 120 140

120

100

80

60

40

20

0

Values in accordance with standards

Typical utility specification

Values achievable by SGB

MVA

MVA

MVA

Po(kW)

PK (kW)

LWA (dB)


Good quality cores

• Cold-rolled grain-oriented sheet of steelfrom well known manufacturers in thebest available quality, with a sheetthickness of 0.3, 0.27 and 0.23 mm.

• Computer-controlled core cutting equipment.

• 45° roof cut.

• Step lap process to mortise join thecolumns and yokes.

• Processing equipment for precise laminating

• Uniform core pressing through bindingsand compacting steel frames.

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The SGB transformers cores contain goodcharacteristics. Both the painstaking selection of the materials and the dependable design of the moulded piecesand their solid manufacture are decisivefor the high quality.The concurrence of these factors permitsprogressive optimisation of no-load lossesand currents, in addition to noise levels. Inthe case of dimension limitations, even themost extreme customer demands can beaccommodated.

Iron core design details

Core before installation

Core-cutting equipment

Positioning of the core


Always well wound

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It is not without reason that SGB trans-formers fulfil the highest requirements ofreliability and long life. The winding process is carried out usingmachines especially constructed for this,which ensures high quality and preciseresults.

• The winding process is carried out byqualified personnel on the latest windingmachines.

• The selection of the type of winding andconductor is made, taking the dimen-sioning currents and the dimensioning tension into account, together withthe required test level as well as the

expected thermal and mechanicalstress.

• During the optimisation of the conductorcross-sections, the influence of the conductor size on the amount of theadditional losses is equally considered,as are the requirements on the short-circuit proofing.

• The stabilisation of the axial windingdimensions is achieved through pre-drying, then establishing the definedwinding lengths during application of theintended gripping force and thethorough, symmetrical design of the windings. At the same time, possiblenecessary measures of compensationmust be included in the calculation toavoid unsymmetrical forces.

• The dispersed arrangement of the press-board barriers and oil extensions permita modern isolation construction betweenthe windings.

• The transformers show an adequatejoint compression and / or gripping of the windings at the core, taking theoccurrences of the axial short-circuitforces into account.

• The correctness of the basic methods ofcalculation and design principles is pro-ved through repeated short-circuit tests.Proofing is carried out both on our ownaccount and at the customer’s request.

• In order to optimally use the windingspace, the winding principles and theconductor types are carefully selectedfor each individual case.

• The stabilisation of the axial windingdimensions is achieved through predrying. The requirements of the dielectric strength and the short circuitproofing, are taken into account equallyas much as the thermal requirements.

Winding design details


Everything from one supplier

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From the order centre . . .

. . . to the production centre

SalesOrder processing with customersPreparation of work ordersEfficient processing from the order tothe shipment

Supplier assessmentMaterial queries / Supplier selection,Material scheduling, Supplier auditing, Deadline monitoring with regard to supply term

Deadline controlDesign monitoringManufacturing monitoringDeadline monitoringMaterial monitoring

... your order is converted into an internalorder by experienced staff.

Thus, our short delivery terms of 5 monthsare accomplished through bundling the competences of sales, calculation,work preparation, purchasing and design. Hand in hand, all necessary documents are prepared and quickly handed over...


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Work preparationPreparation of all manufacturing documents with the support of the modern PPS system

Calculation Creation of all calculation docu-ments using modern computers.

DesignCAD supported design


Values are measurable

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The testing building comprises the steelconstruction hall, which is the actual testroom, and a concrete construction building with the necessary rooms to serveas testing shops and to accommodate thetesting machines.

Some of the most important test facilitiesfollow:• Impulse voltage equipment 1200 kV / 60 kJ• Alternating voltage test equipment 300 kV

(75 kVA / 150 kVA) 100 kV (25 kVA)• Frequency converter

60 Hz / 125-350 Hz / 125 Hz• Testing transformers• Audio frequency converter

83.33/100/116.67/183.33/200/216.67 Hz• 16 2/3 - power supply by

Deutsche Bahn AG• Calibration laboratory to calibrate

electrical measuring devices

Shielding-Resulting values Most important test facilities Building details

The shielding of the testing rooms with 82 mm thick perforated plate panels withregard to:

• Air conditioning (with cooling installation)

• Sound insulation• HF-shielding

resulted in the following values:Hall desired temperature value 20°CMaximum increase during heating on + 5 Kduring this, 400 kW output which can bedissipatedSound-proof level 42 dB, walls37 dB Roller doors, HF interference level 5 pc

Steel construction Concrete construction hall building

Length 42 m 42 mWidth 20 m 10 mHeight 14 m 9 mWalled-in space 13944 m3 4180 m3


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31,5 MVA 115/21 kV ONAN

5 MVA 37,5/20,9 kV ONAN

15/20/25 MVA 138/12.47 kVOA/FA/FA

30 MVA 110/11,5 kV ONAN

10 MVA 33/11 kV ONAN

40 MVA 150/10,5 kV ONAN

31,5/40 MVA 120/22 kV ONAF

31,5/40 MVA 120/22 kV ONAF

40 MVA 115/21 kV ONAF

28 MVA 24/1,1 kV OFWF

Transformers for all the world


The SGB complete service

• On-site assembly• Commissioning• Round the clock accessibility• Monitoring• Overhauling and all year servicing of

your transformers

Contact us!

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°C Transformer

ppm Gas in oil

ppm H20 in oil

Transformer monitoringTOM with working life

consumption calculation

OS Voltage from control room

(if necessary)

ED - Drive motor with TMS 100 S

°C Trans-former

HV-current

°C Circuit breaker°C Environment

Our service encompassesthe following individualmeasures:


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If you do not find a checklist for your query here,please contact us immediately. The SGB-

Employees are standing by ready to offer you competent support and advice. Dial the number

next to your chosen language.

German: +49 (0) 9 41/78 41-245-354

English: -382-456

French: -386-463

Spanish: -463

Or send us an email to:[email protected]


Excellent quality

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Visit us at: www.sgb-trafo.deor: www.smittransformers.com

CREA

TIV

CON

CEPT

REG

ENSB

URG

Druc

ksch

rift B

TO 7

9/02

New manufacture:

• Oil immersed transformers up to andincluding 1.000 MVA, operating voltagesup to 525 kV, in accordance with all current standards and for special designs

• Regulation transformers with on-load tapchangers

• Cast resin dry-type transformers up toand including 24 MVA and rated voltagesup to 36 kV

• System enclosures for cast resin transformers

• Transformers with line drop or parallelregulation

• Pole mounted transformers• Earthing transformers and Peterson coils• Rectifier and furnace transformers• Resonant-circuit reactances, coupling

transformers and reactors for AF ripplecontrol system

• Shunt reactors and current limiting reactors

• Compact stations

Subject to technical modifications

Our supply and work program

SÄCHSISCH-BAYERISCHE STARKSTROM-GERÄTEBAU GMBHOhmstraße 1 • 08496 NeumarkTelephone: +49 (0)3 76 00/83-0Telefax: +49 (0)3 76 00/34 14E-Mail: [email protected]

STARKSTROM-GERÄTEBAU GMBHOhmstraße 10 • 93055 RegensburgTelephone: +49 (0)941/78 41-0Telefax: +49 (0)941/7 17 21E-Mail: [email protected]

SMIT TRANSFORMATOREN B.V.

Groenestraat 336 • NL – 6531 JC Nijmegen

Telephone: 0031 / 24 - 356 89 11

Telefax: 0031 / 24 - 356 87 64

E-Mail: [email protected]

P a r t n e r s i n P o w e r


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