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Cast ResinTransformers

R e s Q R e s i n Q u a l i t y b y S G B

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

So whyCast Resin Transformers?

2

Advantageous capabilities of the enclosure:Instead of transformer bays or cable housings,a simple enclosure can be used for accessprevention. Enclosures can be complementedwith the provision of high voltage flanges andlow voltage cabinets to provide focal stations.

Simple increased performance:Through optimised forced ventilation there is anincrease in performance of about 40%.

High short time overload capability:The current density in the winding with cast resintransformers is considerably lower than with oiltransformers. Short time load peaks, such as withwind power installations, can be easily overcomewithout there being a need to plan the relevantoversizing.

The advantages speak for themselves:

Minimal fire risk:Cast resin moulding material is not very flammableand can be self-extinguishing. There are no specialfire prevention coatings, with associated fireconditions, the calorific potential of the cast resintransformer is minimal and there are no dangerousfire gases capable of long-term damage.

No coolants:Cast resin transformers only need air for cooling.Liquid coolants – of whichever chemical type –cannot be released into the environment. Thereis therefore nonrequirement for bunding a castresin transformer, which would be required for aliquid cooled type.

Unrestricted installation possibilities:The transformer is a key component in theelectrical supply network, and speed of installationcan be valuable. A cast resin transformer is easilyaccommodated, for example, no blast walls arenecessary. Consequently, the planning of theinstallation is simplified and installation costs aresaved.

R e s QR e s i n Q u a l i t y b y S G B

3

Why Cast Resin Transformersfrom SGB?

SGB are able to deliver Cast Resin Transformerswith capacities up to 25 MVA and series voltagesup to 36 kV. Our offer includes convertertransformers, distribution transformers and specialtransformers. With more than 30 years experiencein the construction of cast resin transformers, SGBhas worldwide expertise, and this is expressed inremarkably high quality coefficients such as meantime between failure (MTBF) of over 1,700 years.

Thanks to their unique design, SGB Cast ResinTransformers offer a range of features which setthem apart technically from other cast resintransformers and make them a very dependableand very reliable solution.

For you the customer this means the followingoperational advantages:

• High impulse voltages are controlled safely.• Thermal withstand capability makes overload

possible.• Expansion and contraction of coils in service

is tolerated, even for short circuits.• Long service life is guaranteed.

Summarised:

Further information on the unique distinguishingcharacteristics of SGB-Cast Resin Transformerscan be found on pages 4 to 7.


The high voltage winding is the centrepiece ofthe cast resin transformer. Herein lies SGB’s greattechnical know-how.Core and low voltage winding are also importantfor the overall design, as all components arenaturally interdependent.

One of the characteristics of cast resintransformers is that the conductors of the highvoltage winding are completely encapsulated ina cast resin body with a smooth surface. Thiscan only be carried out in moulded formers undervacuum. SGB’s production technology andmaterials used can also be distinguished throughimportant unique features which set them aparttechnically from other cast resin transformersand make them a very dependable and veryreliable solution.

High voltage windingR eserves-equippedOverloads are permissible due to the thermalreserves provided by specific primary insulation.

E ndurance-enhancedCooling ducts guarantee long service life.

S urge-proofThe double layer winding technology enables thecontrol of high impulse voltages.

Q uantum-leapGlass fibre reinforcement of windings ensuresthat during operation, when the winding heatsand expands, the design has the flexibility to reactwithout damage to the winding even under shortcircuit conditions.

For our customers these specific features meana high level of safety – both in relation to operationand their investment decision.

“Resin Quality by SGB“:These exceptional factors of quality aresubsequently explained in detail.

4


R eserves-equippedThermal loads make overload possibleSGB Cast Resin Transformers not only have anadvantage over oil transformers but also castresin transformers incorporating establishedalternative designs. These use a high voltagewinding design where the conductor consistsof aluminium foil strip and the coil/layer insulationis plastic. The insulation level of this type ofsystem can only be considered as class F, whenconsidering the insulation system as a whole.It is quite different with SGB Cast ResinTransformers as SGB uses insulated profile wiresfor a double layer winding where the primaryinsulation either consists of a high heat resistantpolyesterimide coating with a temperature indexof 200°C or Nomex thread winding of thetemperature class C (220°C). As the operatingtemperature of SGB Cast Resin Transformersrarely reaches the limit of the temperature classF (155°C), the primary insulation has sizeabletemperature reserves.

E ndurance-enhancedGuarantee high service lifeCast resin transformers must emit the resultingheat in the windings over the surface area ofthe coils to the cooler air surrounding thetransformer. This has to be achieved with respectto the winding insulation class and withoutexceeding the average winding temperature, orthe Hot-Spot temperature. The necessary coolingrequirements can be calculated by consideringthe heat transfer coefficient, the ambienttemperature, the surface temperature of thecoil, and the size of the surface area.

5

With cast resin transformers of alternativedesigns, only the inner and outer surface area’sof the high voltage cylindrical coil are availablefor cooling. To provide the necessary surfaceareas for cooling, the coils must be larger. SGBdesign of a double layer winding in comparisonsimply allows for the introduction of additionalcooling ducts inside the coil. In this way veryefficient cooling is achieved. SGB Cast ResinCoils can therefore be equipped with severalcooling ducts.

SGB Cast Resin Transformers use appropriatematerials and design to guarantee a consistentdistribution of temperature inside the coil.The optimised cooling enables a reduction intemperature for the high voltage winding andfurthermore a consistently distributedtemperature for the entire transformer.

High voltage winding 630 kVA transformerwithout cooling duct

High voltage winding 630 kVA transformer with1 cooling duct (1.9 times increase of the surface area)

S urge-proofHigh impulse voltages are controlled safelyOnly SGB Cast Resin Transformers mould theirhigh voltage coils in vacuum combined with adouble layer winding. This ensures safety in thecontrol of impulse voltages brought about by, forexample, lightning strikes or vacuum switches.

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• Regular coil winding of other transformersleads to much greater voltage stress, especiallyon the input coils, because 70 % of the shockimpact does not apply on the first 30 % of thecoils. The risk of winding short circuitstherefore increases significantly.

• The SGB double layer winding by contrastguarantees linear fault distribution for allwindings:

100 90 80 70 60 50 40 30 20 10 0

1009080706050403020100

Impulse voltage test 1,2/50 µs

Turns [%]

Impu

lse

volta

ge [%

]

45 %

Cooling duct

20 % 0 %

2

50 % 80 %

1100 %

Low voltagewinding

High voltagewindingCore

Distribution of voltage with a double layer windingThe voltage values were measured against a trial winding against earth


Q uantum-leapOvercome temperature shocks reliablyCast resin transformers are subject to greatmechanical and thermal shocks and strains intheir transport and in particular when operated.Therefore of great importance is the ability of thetransformer to safely control spasmodictemperature increases.

A decisive factor in this feature is the constructionof the cast resin composite material, into whichthe conductors are moulded. This dependsespecially upon the tensile stress and the thermalcoefficients of expansion of the compositematerial in relation to the winding material. Withmany cast resin transformers this compositematerial is comprised of epoxy resin which ismixed to over 70 % with a mineral bulking agent,mainly quartz powder. Such a composite materialcan reach the tensile strength of the epoxy resin,about 50 N/mm. With the thermal coefficients ofexpansion the value of aluminium can roughly bemet with maximum mineral filling but remainsclearly above that of copper. This is the reasonwhy cast resin transformers of usual technologywere only available for decades with aluminiumconductors. Recently there has been animprovement through an additional concentrationof glass fibre on the surface.

It is quite different with SGB. Here the compositesystem is comprised of a glass fibre concentratedepoxy resin between the layers and on the surfacewith high tensile strength in the area of 120 N/mmand a coefficient of expansion which is equallyclose to that of copper and aluminium. SGB CastResin Transformers are produced with both

copper and aluminium winding materials. Castinghas always occurred under vacuum and istherefore free of voids . The advantage of theSGB composite system has frequently beenrecognised in tests. With an exit temperatureof -50°C, SGB Cast Resin Coils have also safelypassed the required temperature shock tests inaccordance with IEC 60076-11 for climate classC2 based on a temperature of -25°C.

7

Core

8

With the calculation of cores for cast resintransformers, no-load losses, noises and no-loadcurrents are quite considerable and in manycases, crucial quality features. As a result, thechoice of high-quality materials for core designand manufacture is vital.

For SGB Cast Resin Transformers a cold-rolled,grain-oriented magnetic plate is used and has atypical loss factor of 0.85 W/kg. In most cases ofapplication, values according to the requirementsfor no-load losses and noises can be reached.For special requests a so-called Hi-B plate isused with which the no-load losses can then bereduced further by approximately 15% and thenoise level by around 5-7 dB(A), so that for specificapplications, e.g. in hospitals, low losses andreduced noise requirements are met.

The cores themselves are manufactured onmodern transverse and core-laying machines,which guarantee a shift in the so-called ‘step lap’process with extreme precision. Put simply, thesingle sheets are tapped in the usual ‘step lap’process by means of a repeated overlap and asa result the losses are reduced.

For corrosion protection, a high temperature2-component coating is used. This coating givesprotection to the core against the environmentalelements to which it would be subjected. Thecoating also infiltrates between the individualcore sheets and sticks them together which givesfurther benefits when handling noise andvibrations

The core is fixed with a holding frame consistingof lower and upper clamping bars and flat-rolledtie rods directly on the core. The tie rods consistof magnetic flat-rolled steel and connect thelower and upper clamping bars together. Theholding frame is constructed in such a way thatthe core plates are kept free from tensile loadand compressive stress as far as possiblebecause, as such, they retain their excellentfeatures in relation to losses and noises. Thelower yoke is allowed to rest, supported throughmouldings made from glass fibre-strengthenedsynthetic material onto the lower chassis pillarto which bidirectional adjustable coils can befixed. Different attachments such as additionalfootbridges, tubs, vibration-reducing componentsand others can indeed be chosen depending onthe individual project and client requirements.


SGB Cast Resin Transformers’ low voltage windingis almost always used as a full length foil winding.The advantages of this form of winding are evident:

• Reduction of additional losses• Even temperature distribution in the coil• High short circuit consistency

Exceptions exist if the LV winding is rated as lessthan 160 kVA or has a voltage rating of over 3 kV.

For more than 40 years SGB has been producingfoil windings for distribution transformers and castresin transformers. This long expertise is thereason for high quality features such as:

• SGB uses treated material exclusively fromfoil manufacturers in special cylinders toguarantee that the edges are burr-free. Thisis an important requirement for electricaldependability.

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Low voltage winding

• To connect the outbound connection edgeswith the tapes, there are two commonpractices, welding under inert gas or coldwelding under high pressure (400 kN). Coldwelding has been used for more than 20 yearsat SGB.Benefits:· No mettalurgic changes of the windingmaterial by means of a temperature process

· No foreign bodies which can occur withmoulding

• By using multi-layer prepregs, there is ahigh-strength, thick-walled cylinder, which canaccommodate the radial short circuit forceunsupported-compared with the otherwisestandard solutions.

10

Cast Resin Transformer – Key ComponentsConnection of

temperature sensors

Bar cylinderLV terminal

Upper yoke

Carriage frame

Bar cylinder Low voltagewinding

Conductor

High voltagewinding


11

Upper core clampLifting lugs

Core leg

Coil support

HV terminal

HV winding

Delta connection

Lower core clamp

Lower yoke

Rollers

Quality

12

The manufacture of cast resin transformers is ofcourse certified within SGB in accordance withISO 9001 and ISO 14001.

As a provider to OEM customers with high qualitystandards, we are familiar with challenging qualitysystems such as, for example, Six-Sigma.

Classification societies such as GermanischerLloyd, RINA or Bureau Veritas have approvedSGB Cast Resin Transformers.

SGB has been producing cast resin transformersfor over 30 years and therefore has the greatestwealth of experience in this field worldwide. Thisremarkable know-how is reflected in exceptionallyhigh quality coefficients, such as MTBF of over1,700 years.

SGB Cast Resin Transformers naturally complywith all the usual quality standards such as:• Fire class F1• Environmental class E2• Climatic class C2.


SGB Cast Resin Transformers are designedand produced as standard in accordancewith IEC 60076-11.

SGB Cast Resin Transformers comply with all thetests required in IEC 60076-11

All detailed inspections and type tests, e.g. shortcircuit tests or temperature rise tests as well asmany special tests have been completed in thecourse of our supply. In this way the specificproperties stipulated in the customer specificationcan also be checked, and met.

In conjunction with external institutes, we havealso completed detailed measurements for thefollowing areas:

• EMV Electromagnetic tolerance in conjunctionwith Systron EMV Ltd, Rednitzhembach

• Fire gas analysis or low temperaturecarbonisation gas analysis of components ofcast resin transformers in conjunction withthe Allianz Centre for Technology, Munich

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Tests

• Vibration test in conjunction with IABG, Munich• Short circuit strength in conjunction with FGH,

Mannheim and Zkusebnictvi High PowerLaboratory, Prague

• Certification for -50 ∞C in conjunction withStandard Elektro, Moscow

• E2 and C2 tests in conjunction with KEMA

SGB Cast Resin Transformers are supplied inmore than 35 countries and naturally meet therelevant local standards in these countries suchas for example, ANSI, IEEE, GOST, etc.

It is possible to over load a cast resin transformer,in much the same way as is possible with liquid-filled types.

To guarantee a service life of over 20 years,overloading of cast resin transformers iscontrolled with a temperature monitoring systemwhich shuts down the transformer at a fixedrated response temperature.

The IEC standard stipulates that transformerswith class F insulation must withstand a temporarytemperature of 180 degrees Celsius withoutimmediate damage. Our choice of rated responsetemperature comes from the heating permittedin the low voltage winding. The rated responsetemperature considers the hotspot rate at themeasuring point and depending on the heatingof the coil it is 120° - 150°C, a maximum coolanttemperature of 40°C, which is in accordance withVDE 0532, Part 6, is assumed.

Overload capacityIf, in practical operation, the transformer isoperating under the rated power and the ambientcooling temperature is below 40°C, then coiltemperatures below the threshold valuespermitted arise as a result. This factor can beexploited for overloads until the fixed responsetemperature of the thermistor is obtained. Theextent and duration of the overload aredetermined through the preceding preload, theactual ambient temperature and the coil timeconstant. The diagram below for a 1,000 kVA castresin transformer shows this correlation, basedon a coolant temperature of 20°C and differentpermanent preloads. From this it follows thatthe transformer can be operated for around19 minutes with an overload of 130 % of its ratedpower even with a 100 % permanent preload, untilthe temperature monitoring system responds.

As the "coil time constant" parameter dependsvery much on the specific technical requirementsand build, universal overload diagrams are notpossible. On request we can run modellingprograms which will provide the data wherebyall interpretation-specific parameters are takeninto consideration (see diagram left).

We have deliberately only shown the overloadcapacity for the temperature produced withtemperature monitoring. As a result we do notexpose the transformer to temperatures abovethe threshold temperature. Consequentlyuncontrolled overloads are prevented fromleading to thermal strains that could lead to anexceptionally short service life.

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Reducing the noise from transformers radiatinginto the surroundings is becoming more and moreimportant. SGB Cast Resin Transformers aretherefore manufactured as standard with reducedlosses and noise.

In addition to the choice of induction and the typeof core material SGB also employs mitred jointsin the "step lap" process to improve noiseproperties and reduce transformer losses.

The specific noise level of cast resin transformersin AN operation without an enclosure can beestablished, in practice, the possibilities are:

A – evaluated sound pressure levelLPA in dBA – evaluated sound power levelLWA in dBand associated measurement service LS in dB.

The definition of these values and how noisemeasurement is carried out is defined in theGerman Edition of European Standards 60551/Association for Electrical, Electronic &Information Technologies 0532 T7.Important terms in this document are:

• Reference plane (from the thread measure,which includes the heat radiating surface)

• Length of measuring path pm in m• Measurement area S in m2

(See accompanying sketch above)

As with dry-type transformers for safety reasonsthe measurement for cast resin transformers aremade at a distance of 1 metre from the referenceplane. For oil-filled transformers with enclosed

windings, a distance of 0.3 m can be measuredfrom the vessel.

The following combination of LWA and LPA with LS

is set in the German Edition of European Standards60551/ Association for Electrical, Electronic &Information Technologies 0532 T7:LWA = LPA + LS

LS = 10 lg S : S0 dBS = 1,25 h x pm and S0 = 1 m2

pm = 4 MA + (DWA + 2) πMA = Dual spacing in mDWA = Coil outer diameter in mh = Height of core in m

15

Noise

Reference plane Measuring path

Distance is 1 m

1 m

MA

DWA

h

Measuring point arrangement for noise measurements ondry-type transformers without enclosure

The size of SGB Cast Resin Transformers availablecomprises ratings of up to 25 MVA and seriesvoltages up to 36 kV. As well as, standardtransformers SGB also manufactures convertertransformers in 12-pulse, 18-pulse or 24-pulsetypes, special transformers or special productssuch as chokes, for example.

Applications with increasedrequirements

• Installations with a high overload demand ofup to 450 % of the rated powerSGB Cast Resin Transformers supplyunderground and local rail networks in manycities of the world such as Berlin, Washington,Dallas, Los Angeles, San Francisco or Shanghai.

• Installation with high environmental andoscillation demandsSGB Cast Resin Transformers are preferreddue to the strength of their robust manufacture– e.g. glass fibre strengthened high voltagewinding-used in: onshore and offshore windenergy, shipbuilding and oil platforms.

References• Installation in climatic zones with extremely

low temperaturesSGB Cast Resin Transformers have been certifiedby the independent Institute of InspectionStandard Elektro, Moscow, up to -50°C.

Typical applications• Industrial distribution networks

SGB Cast Resin Transformers are here in theload centre and allow for efficient operation.

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Local connections Undergrounds (Subways)

Oil platforms Onshore and Offshore wind power plants

Automobile industry Chemical works and refineries

Paper industry Steelworks

Glass industry Semicoinductor and solar industry

Snowy regions Mountainous regions


• Large buildingsSGB Cast Resin Transformers can be spreadover all levels and guarantee low-loss and cost-efficient distribution.

• Customer SubstationsSGB Cast Resin Transformers are in singlesubstations in small industrial firms,supermarkets and shopping centres.

• Water protection areasThe environmental compatibility of SGB CastResin Transformers allows for use in waterprotection areas e.g. also as pole-mountedsubstations.

• Power generationOn the strength of their high dependability SGBCast Resin Transformers are in every type ofenergy generating installation as any malfunctionhere can have dramatic & costly consequences.

• Infrastructure

Wherever trouble-free operation of completeinfrastructure is dependent upon the reliabilityof fewer individual components, specific qualitybenchmarks are set. For this reason on thestrength of their exceptional dependability, SGBCast Resin Transformers are preferred thanksto the unique winding concept.

• Research and developmentScience frequently makes specific technicaldemands which differ fundamentally from thoseindustrially. On the strength of the high technicalcompetence of SGB and the quality of SGB CastResin Transformers, SGB is also the preferredsupplier in this field e.g. for nuclear fusioninstallations or particle accelerators.

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Colleges and universities Clinics

Hotel facilities High rise facilities

Datacentres Banks

Shopping centres and supermarkets Manufacturing sites

Coal and cogeneration plants Biogas plants

Nuclear power stations Solar and wind power plants

Airports Container docks and ports

SGB Cast Resin Transformers do not demand muchat the installation site. This is as a result of thereduced requirements for ground water protection,fire prevention and functional preservation asdescribed in the German Institute forStandardisation and Association for Electrical,Electronic & Information Technologies 0101 and0108 and ELT Bau VO. With SGB Cast ResinTransformers, no protective measures for theprevention of water pollution are necessary.

Should the cast resin transformer however beequipped with rated voltage above 1 kV forinstallations for crowds of people in accordance

with the German Institute for Standardisation andAssociation for Electrical, Electronic & InformationTechnologies 0108 and Elt Bau VO, the additionaldemands required would arise.

SGB Cast Resin Transformers are for indoor useonly as the ingress protection is to IP 00 only. Thecast resin surface of the transformer coil doesnot have a guard when operated. For that reasonprotection against accidental contact is necessaryand this can be achieved by attaching a protectivestrip or safety guard in the transformer enclosure,which is given the correct protection ratio inaccordance with EN60076-3. Alternatively, toprotect against water, they must be placed in anenclosure with a relevant IP degree of protection.

Installation ConditionsCast Resin Transformers can be housed withmedium and low voltage switchgear together inan enclosure. As no additional measures areessential here for oil drip pans or fire prevention,substantial expenses for transformer enclosurescan be saved on this part of the construction site.With open air installation an enclosure ismandatory. The IP degree of protection of theenclosure therefore has to be determined.

When planning the site, it is essential to take intoconsideration particular extreme installationconditions which may exist. It is possible thatspecial measures must be taken with the use of

a cast resin transformer in altitudes of over1,000 m due to the low air density. SGB can adviseyou individually and can adapt the equipment tothe on-site conditions.

SGB Cast Resin Transformers come withadditional fittings for use in ships, excavators,earthquake areas or wind power plants etc,where there are increased mechanical demands.In addition SGB Cast Resin Transformers have adecisive advantage in that all components arealways visible and as a result any potentialmechanical damage can be identified andrepaired immediately.

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Power increase with fansBy attaching fans, the cast resin transformer withthe cooling method AN can be easily convertedinto the cooling method AF providing an increasein capacity of up to 40 % or above in special cases.This facility gives the planner freedom in the initialdesign of the structure.In principle it is possible to regularly use theincreased power resulting from the coolingmethod, AF, in standard operations.

The redundancy concept for a distribution gridwith two or more cast resin transformers isattractive. The transformers are sized in such away that in standard operations about 70 % of thepower is delivered – a reasonable interpretationfor cost effectiveness – with a transformermalfunction, the AF-power of one transformerwould suffice to take on the power of the othertransformer during planned maintenance or in thecase of a malfunction without any operationalrestrictions.

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Transformer-optionsEnclosuresCast Resin transformers are supplied with openterminals. Enclosures with accessible installations,and guards are therefore often required, wherethe degree of protection can be selected inaccordance with the German Institute forStandardisation 40 050 and 57 101 / VDD 101.

The SGB enclosure kit offers cost-effectivestandard enclosures with optional features andsimple installation on-site due to pre-assembleddelivery. IP23 for interior installations and IP33 foropen-air installations are provided as standardbut all other options are also available. Glandplates and angle brackets are provided for thecable connection from below.

The enclosures have the appropriate air inletsand outlets for natural or forced air cooling toconduct heat resulting from transformer away.At the site installation the ventilation to providethe necessary cool air flow must be considered.

Transformer equipmentIn addition to the basic components – core, windings andframe – ancillary equipment is necessary in order tointerface to the electrical infrastructure. Initially theseare the electrical connections and transformer monitoringand, as an option, fans, enclosures and further mechanicaladd-on parts such as busbars, earthing switches, anti-vibration pads and transformer supports – according tospecial instructions.

Electrical connections• High and low voltage connections are opposite each

other as standard on the side wall of the transformer.(Illustration 1)

• The high voltage connection points are incorporatedmechanically and electrically into the high voltage castresin coil together with the tapping lugs. (Ill. 2)

• The low voltage terminal buses including the neutralpoint are led out upwards. (Ill. 3)

Execution of connections400 - 630 KVA (Ill. 4)

- 800 KVA (Ill. 5)- 1.000 kVA (Ill. 6)

1.250 - 3.150 kVA (Ill. 7)

These are the standard connections for the vector groupDyn, other project-specific connections are possible onrequest.

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1 2 3

Accessoires and Monitoring

5

6

4

7


21

Monitoring the temperatureTemperature monitoring by means of PTC Sensors(resistors with dramatic resistance change at theresponse temperature) is generally provided foreach cast resin transformer. As the low and highvoltage windings stay together in thermalequilibrium, the thermistors are positioned on thelow voltage winding. Importantly they protect thevacuum cast high voltage windings againstimproper high temperatures, which can occur withoverload, insufficient cooling and high

environmental heat. Core monitoring by means ofPT100 or PTC Sensors are possible if the customerso wishes.

Normally two thresholds are incorporated:The first one signals any temperature excess atthe limits of the normal service life consumption,i.e. continuous nominal load at 20°C coolanttemperature. It should warn the operator to initiatemeasures to cool the transformer.

The second system is geared to the boundarytemperature of the declared temperature classwhich should not be exceeded as this would resultin accelerated service life consumption. Thetransformer should then be shut off. The threeresistors are wired onto a terminal block. Fromhere there is a double-conductor connection tothe tripping unit, which is provided loose for freeinstallation into the switchgear.

Selection table series 10 (Um = 12 kV)

22

Capacity Losses / Noises / Weight Measurements in mm

Model Rating PO Pk 75C Pk 120C uk LPA LWA Total A B C D E F Gtype (W) (W) (W) (%) (db) (db) weight

(kg)

DTTHL 50/10 240 1.350 1.550 4 39 50 350 860 670 970 390 520 125 40DTTHL 100/10 320 1.750 2.000 4 40 51 550 920 670 1.150 410 520 125 40DTTHL 160/10 440 2.400 2.750 4 42 54 800 980 670 1.340 420 520 125 40DTTHL 250/10 600 3.100 3.550 4 45 57 1.000 1.140 670 1.120 500 520 125 40DTTHM 250/10 500 3.100 3.550 4 38 49 1.200 1.160 670 1.260 500 520 125 40DTTH 400/10 1.150 4.300 4.850 4 56 68 1.250 1.260 820 1.420 550 670 125 40DTTHL 400/10 880 4.300 4.850 4 47 60 1.250 1.280 820 1.400 550 670 125 40DTTHM 400/10 730 4.300 4.850 4 38 51 1.300 1.350 820 1.280 560 670 125 40DTTHYL 400/10 800 4.800 5.400 6 47 60 1.300 1.350 820 1.400 570 670 125 40DTTHYM 400/10 650 4.800 5.400 6 40 51 1.550 1.400 820 1.380 570 670 125 40DTTH 500/10 1.350 5.500 6.200 4 56 69 1.500 1.400 820 1.450 580 670 125 40DTTHL 500/10 1.050 5.500 6.200 4 48 61 1.550 1.300 820 1.340 580 670 125 40DTTHM 500/10 850 5.500 6.200 4 38 52 1.650 1.350 820 1.350 580 670 125 40DTTHYL 500/10 1.000 5.850 6.600 6 48 61 1.550 1.450 820 1.400 590 670 125 40DTTHYM 500/10 800 5.850 6.600 6 38 52 1.650 1.450 820 1.400 590 670 125 40DTTH 630/10 1.500 6.400 7.200 4 57 70 1.800 1.450 820 1.500 595 670 125 40DTTHL 630/10 1.150 6.400 7.200 4 49 62 1.850 1.450 820 1.450 595 670 125 40DTTHM 630/10 950 6.400 7.200 4 40 53 2.000 1.450 820 1.700 595 670 125 40DTTHYL 630/10 1.100 6.700 7.550 6 49 62 1.850 1.500 820 1.400 590 670 125 40DTTHYM 630/10 900 6.700 7.550 6 40 53 2.000 1.450 820 1.500 590 670 125 40DTTH 800/10 1.750 7.600 8.550 6 58 72 2.300 1.600 820 1.500 625 670 125 40DTTHL 800/10 1.350 7.600 8.550 6 50 64 2.400 1.600 820 1.500 625 670 125 40DTTHIL 800/10 1.350 4.950 5.550 6 47 61 2.600 1.600 820 1.700 635 670 125 40DTTH 1.000/10 2.000 8.800 9.900 6 59 73 2.400 1.650 980 1.650 665 820 160 50DTTHL 1.000/10 1.500 8.800 9.900 6 51 65 2.700 1.600 980 1.760 640 820 160 50DTTHIL 1.000/10 1.550 5.900 6.650 6 48 62 3.100 1.800 980 1.850 660 820 160 50DTTH 1.250/10 2.400 10.700 12.000 6 60 74 2.900 1.750 980 1.650 655 820 160 50DTTHL 1.250/10 1.750 10.700 12.000 6 52 66 3.500 1.750 980 1.900 655 820 160 50DTTHIL 1.250/10 1.850 7.500 8.450 6 49 63 3.500 1.800 980 2.000 660 820 160 50DTTH 1.600/10 2.800 12.500 14.050 6 61 76 3.800 1.800 980 2.000 665 820 160 50DTTHL 1.600/10 2.100 12.500 14.050 6 53 58 4.000 1.850 980 2.000 700 820 160 50DTTHIL 1.600/10 2.250 8.700 9.800 6 50 65 4.550 1.900 980 2.100 685 820 160 50DTTH 2.000/10 3.500 16.000 17.950 6 64 79 4.750 2.000 1.270 2.150 705 1.070 200 70DTTHL 2.000/10 2.650 16.000 17.950 6 55 70 4.900 2.000 1.270 2.200 720 1.070 200 70DTTHIL 2.000/10 2.800 11.500 12.900 6 52 62 4.800 2.000 1.270 2.200 720 1.070 200 70DTTH 2.500/10 4.300 18.500 20.750 6 66 81 5.100 2.100 1.270 2.200 755 1.070 200 70DTTHL 2.500/10 3.000 18.500 20.750 6 56 71 5.500 2.100 1.270 2.250 730 1.070 200 70DTTHIL 2.500/10 3.150 14.000 15.700 6 53 68 5.850 2.100 1.270 2.250 745 1.070 200 70

kVA

50100160

250

400

500

630

800

1.000

1.250

1.600

2.000

2.500

• Selection tables, normal and reduced noise levels.

• Lightning impulse voltages in accordance with IEC 60 076.

• Declared sound levels apply to AN-operation without enclosure.

• Sound pressure level measurement distance 1 m

• Sound power level see Page 15 ‘noise’

• Different capacities, execution for Um 36 kV as well as

different test levels are available on request

• Vector groups up to 125 kVA Yzn 5, above that Dyn 5

A

B

C

D

EFG


23

Selection table series 20 (Um = 24 kV)Capacity Losses / Noises / Weight Measurements in mm

Model Rating PO Pk 75C Pk 120C uk LPA LWA Total A B C D E F Gtype (W) (W) (W) (%) (db) (db) weight

(kg)

DTTHL 50/20 260 1.450 1.650 6 39 50 420 1080 670 1.160 410 520 125 40DTTHXL 50/20 300 1.200 1.400 4 41 50 490 960 670 1.190 400 520 125 40DTTHL 100/20 340 1.850 2.100 6 40 51 600 1.080 670 1.120 430 520 125 40DTTHXL 100/20 400 1.550 1.750 4 40 51 790 1.120 670 1.200 450 520 125 40DTTHL 160/20 480 2.550 2.900 6 42 54 940 1.160 670 1.200 440 520 125 40DTTHXL 160/20 580 2.200 2.500 4 42 54 1.030 1.120 670 1.340 450 520 125 40DTTHL 250/20 650 3.350 3.800 6 45 57 1.100 1.300 670 1.240 480 520 125 40DTTHM 250/20 530 3.350 3.800 6 37 49 1.150 1.240 670 1.240 480 520 125 40DTTHXL 250/20 800 3.050 3.450 4 43 57 1.330 1.200 670 1.280 500 520 125 40DTTHXM 250/20 650 3.050 3.450 4 37 49 1.330 1.180 670 1.400 500 520 125 40DTTH 400/20 1.200 4.850 5.450 6 56 68 1.350 1.440 820 1.460 585 670 125 40DTTHL 400/20 940 4.850 5.450 6 47 60 1.500 1.500 820 1.550 585 670 125 40DTTHM 400/20 770 4.850 5.450 6 38 51 1.800 1.500 820 1.550 585 670 125 40DTTHXL 400/20 1.100 4.300 4.850 4 50 60 1.750 1.500 820 1.500 600 670 125 40DTTHXM 400/20 900 4.300 4.850 4 38 51 2.000 1.450 820 1.550 600 670 125 40DTTH 500/20 1.500 6.000 6.750 6 56 69 1.550 1.540 820 1.460 585 670 125 40DTTHL 500/20 1.150 6.000 6.750 6 48 61 1.650 1.550 820 1.550 585 670 125 40DTTHM 500/20 900 6.000 6.750 6 39 52 2.200 1.600 820 1.600 585 670 125 40DTTHXL 500/20 1.400 5.500 6.200 4 48 61 2.000 1.600 820 1.600 615 670 125 40DTTHXM 500/20 1.150 5.500 6.200 4 42 54 2.250 1.500 820 1.550 615 670 125 40DTTH 630/20 1.650 6.900 7.750 6 57 70 1.800 1.650 820 1.500 605 670 125 40DTTHL 630/20 1.250 6.900 7.750 6 49 62 1.950 1.650 820 1.500 605 670 125 40DTTHM 630/20 1.000 6.900 7.750 6 43 55 2.100 1.650 820 1.500 605 670 125 40DTTHXL 630/20 1.600 6.100 6.850 4 52 66 2.100 1.500 820 1.600 620 670 125 40DTTHXM 630/20 1.300 6.100 6.850 4 44 58 2.300 1.600 820 1.600 620 670 125 40DTTH 800/20 1.950 8.300 9.350 6 58 72 2.200 1.700 820 1.600 635 670 125 40DTTHL 800/20 1.550 8.300 9.350 6 50 64 2.200 1.650 820 1.700 635 670 125 40DTTHIL 800/20 1.450 5.250 5.900 6 48 62 2.750 1.800 820 1.650 660 670 125 40DTTH 1.000/20 2.300 9.700 10.900 6 59 73 2.400 1.750 980 1.840 670 820 160 50DTTHL 1.000/20 1.800 9.700 10.900 6 51 65 2.650 1.760 980 1.800 660 820 160 50DTTHIL 1.000/20 1.700 6.400 7.200 6 47 62 3.250 1.800 980 1.950 670 820 160 50DTTH 1.250/20 2.750 11.700 13.150 6 60 74 2.900 1.940 980 1.800 680 820 160 50DTTHL 1.250/20 2.150 11.700 13.150 6 53 67 3.100 1.880 980 1.860 665 820 160 50DTTHIL 1.250/20 2.200 7.700 8.650 6 49 53 3.950 1.900 980 1.900 685 820 160 50DTTH 1.600/20 3.100 14.000 15.700 6 61 76 3.500 1.900 980 2.100 695 820 160 50DTTHL 1.600/20 2.400 14.000 15.700 6 53 68 3.800 1.900 980 2.050 700 820 160 50DTTHIL 1.600/20 2.450 9.300 10.450 6 50 65 4.300 1.960 980 2.120 690 820 160 50DTTH 2.000/20 4.100 17.000 19.100 6 64 79 4.250 2.060 1.270 2.180 750 1.070 200 70DTTHL 2.000/20 2.900 17.000 19.100 6 55 70 4.800 2.080 1.270 2.160 730 1.070 200 70DTTHIL 2.000/20 3.000 12.000 13.500 6 52 62 5.350 2.000 1.270 2.050 725 1.070 200 70DTTH 2.500/20 5.000 20.000 22.450 6 66 81 5.350 2.250 1.270 2.250 765 1.070 200 70DTTHL 2.500/20 3.600 20.000 22.450 6 56 71 6.100 2.200 1.270 2.100 770 1.070 200 70DTTHIL 2.500/20 3.700 14.500 16.300 6 53 68 6.350 2.150 1.270 2.200 790 1.070 200 70

Tables-Key

Normal execution

Loss and reduced noise levels

Industrial or special execution

kVA

50

100

160

250

400

500

630

800

1.000

1.250

1.600

2.000

2.500

Details on general hints for planning, installation

conditions or connections are at:

www.sgb-trafo.de/de/productght.aspx

STARKSTROM-GERÄTEBAU GMBHOhmstraße 10 • D-93055 RegensburgTelefon: +49 (0) 941 / 78 41-0Telefax: +49 (0) 941 /78 41-439E-Mail: [email protected]

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

SMIT TRANSFORMATOREN BVGroenestraat 336 • NL-6531 JC NijmegenTelefon: 00 31 / 24-356 89 11Telefax: 00 31 / 24-356 87 64E-Mail: [email protected]

Manufacturing range

• Cast Resin Transformers up to and including25 MVA and service voltage up to 36 kV

• Oil transformers up to and including 1,000 MVA, service voltage up to 525 kV in accordance withall relevant standards and in special execution

• Regulating transformers with on-load tap changers• System enclosures for cast resin transformers• Transformers with line drop or parallel regulation• Pole mounted transformers• Earthing transformers and arc suppression coils• Rectifier and furnace transformers• Resonant-circuit reactances, coupling transformers

and reactors for AF ripple control systems• Shunt reactors and current limiting reactors• Compact stations

Subject to technical modifications

www.sgb-trafo.de

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