Dry Type Substation Transformers

T R A N S F O R M E R C O M PA N Y

GM Transformer Company has establisheditself as a leading manufacturer of custom drytype transformers. With an exceptionally

large and experienced engineering staff, MGM has theability to design to the varying criteria of differingindustries while maintaining short lead times. Core andcoil applications for regulators and UPS systems, lowloss/high efficiency drives isolation transformers.Special custom size K-factor rated substation transformers for retrofit are but a few of the specialtransformers MGM has designed and manufactured.

MGM employs three winding styles for Special DesignDry Type transformers, based on kVA, voltage and BILrequirements. The ability to select a specific windingstyle assures the highest degree of mechanical strengthunder short circuit stress conditions and suitability fordifferent voltage classes.

Most transformer companies offer standard engineeredproducts only, and ask the users to make it fit theirapplications. MGM can engineer the product bothelectrically and mechanically to fit virtually any application.

M

MGM Transformer Companymanufactures transformers in sixmajor categories:

Special Design Dry Type Transformers:9 kVA to 10,000 kVASingle Phase & Three Phase600 V to 34.5 kVK-Factor RatingsRetrofit Applications

Dry Type Substation Transformers:225 kVA to 10,000 kVA600 V to 34.5 kVIndoor and Outdoor

Liquid Filled Substation Transformers:500 kVA to 10,000 kVA2.5 kV to 34.5 kVIndoor and Outdoor

Dry Type Drives Isolation Transformers:6, 12, 18, 24 and 36-Pulse15 kVA to 7,500 kVA600 V to 25 kVIndoor and Outdoor

Liquid Filled Drives Isolation Transformers:6, 12, 18, 24 and 36-Pulse200 kVA to 7,500 kVA2.5 kV to 25 kVIndoor and Outdoor

600V Class Transformers:15 kVA to 3,750 kVA, 3-Phase10 kVA to 833 kVA, 1-Phase

Special Design

Dry Type Transformers

PRODUCT RANGE

Three PhaseVoltage Class KVA600 V thru 1.2 kV 9 thru 2,000 2.4 kV thru 5 kV 15 thru 10,0008.7 kV thru 15 kV 45 thru 10,00025 kV 225 thru 10,00034.5 kV 500 thru 10,000

Single PhaseVoltage Class KVA600 V thru 1.2 kV 10 thru 833 2.4 kV thru 5 kV 15 thru 1,6678.7 kV thru 15 kV 30 thru 1,66725 kV 150 thru 1,66734.5 kV 333 thru 1,667

Barrel woundThe rectangular barrel woundstyle is the most commonmethod in the industry for 600Vand 5kV applications.MGM’s standard is the superioroval barrel wound method for600V class and 5kV class, 45kVBIL maximum.

Section woundThe section wound style is rarelyused in the industry due tohigher cost vs. barrel or randomwound. May be used for specialapplications up to 125 kV BIL.

SPECIFICATIONSAluminum/Copper

150°C / 115°C / 80°C or Special Request

220°C insulation

NEMA standard/special sound levels

ANSI standard/special BIL levels

VPI

UL K-factor ratings

UL/CUL/CE/CSA listings (check with factory)

Multi-voltage input/output

50/60/400 Hz

OEM core and coil

Multiple electrostatic shields

Design to meet customer impedance and losscriteria

Ultra Efficient Designs

Disk woundDue to its superior design criteria,MGM uses this method on most15kV class to 125kV BIL.

RANGE

225kVA-3,750kVA,600 V

225kVA-10,000kVA,2.4/5/15kV

500kVA-10,000kVA,34.5kV

SPECIFICATIONS

BULL RUSHPROGRAM

Aluminum/Copper150°C / 115°C / 80°C220°C insulationIndoor/outdoorANSI standard/special BIL levelsVPIUL K-factor ratingsUL/CUL/CSA listings(check with factory)

Need it fast? We can deliver.Emergencies happen and we’rehere to respond. WE WILLWORK 24/7 TILL THE UNITIS DONE OR YOUR MONEYBACK! Ask about our BULLRUSH program and let us knowwhat you need.

Dry Type Substation 1800 kVAPrimary 6.3kVΔ Secondary 400Y/231V 50Hz;150°C Rise; Copper Wound; Digital TemperatureMonitor; NEMA 3R Louvers; Low VoltageTransition Section with Flex Leads

For over two decades, MGM Transformer Company has been a reliable source for

quality secondary unit substation transformers. Our standard designs cover the

full range of requirements from 5kV to 34.5kV, 500kVA to 10,000kVA, in both

liquid and dry type.

As an engineering oriented transformer company, we maintain a large engineering

staff. Our experience in working with various switchgear manufacturers enables

us to design the high voltage/low voltage switchgear interface, assuring the proper

match in the field. Flex connectors can be supplied.

Non-standard substation designs are also available for special situations such as

failed unit retrofitting or PCB replacement.

All manufacturing processes are done on the premises.This advantage, along with

a large inventory of electrical steel and wire, assures our customers of the

requirements.

shortest standard lead times,industry's regardless of the interface

Substation Transformers

Safe, Convenient andEnvironmentally Sound

Installations of ventilated dry-typetransformers do not require a liquidconfinement area, automatic fire extinguishing system or fire vault. Dry-type transformers use no insulatingliquids, virtually eliminating the risk oflocal environment contamination andsimplifying routine maintenance byeliminating the need to check, replaceor clean liquid. Dry-type units arerelatively lightweight and can be conveniently installed on upper floors,balconies, roof trusses or roofs.Insurance companies generally offerlower premiums for installations ofdry-types than for liquid-filled transformers.

General ConstructionCoils are vacuum-pressure-impregnated (VPI) with solventlesspolyester resin, ensuring completeimpregnation of the windings andinsulation.The finished VPI coils areincredibly strong, readily dissipate heatand are protected against moisture,dirt and most industrial contaminants.Ventilated dry-type winding designsvary depending on the voltage, basicimpulse level (BIL) and current of theindividual winding and/or application of the transformer. For all units, theinsulation system will be 220°Cregardless of the average winding rise.

MGM ventilated dry-type transformersare designed for indoor or outdoorapplications in schools, hospitals,industrial plants, commercial buildingsand any place requiring safe anddependable power.Ventilated dry-typetransformers offer an economicalsolution and are extremely reliablewhen properly installed andmaintained.

KVA HeightInches

Width*Inches

DepthInches

Weightlbs

225 90 56 50 2,400300 90 56 50 3,000500 90 72 50 3,700750 90 80 50 4,9001000 90 90 50 6,0001500 90 90 50 8,1002000 100 100 60 9,7002500 108 108 60 11,5003000 108 108 60 12,800

*Add 18" to width for each ATC.

Based upon 15kV class, 150°C rise. Al windings

NOTES:1. Coordination to HV/LV Switchgear may require Transition/Throats.2. Depth and height dimension may increase for outdoor NEMA 3R enclosures.3. Dimensions may vary with special requirements.4. Dimensions and weights are subject to change without notice and should not be used for construction purposes.5. Compact designs available.6. Retrofit designs available. (with or without enclosures)7. Special, totally enclosed enclosures available. (dimensions will vary)8. MGM is now offering NEMA 1/3R/4 stainless steel enclosures.

Ventilated Dry-Type Transformers

Approximate Enclosure Dimensions and Weights

WidthDepth

Height

UL Listing, CSA, & CULVacuum Pressure Impregnated(VPI) windings80°, 115°, 150°C average windingrise ratings60 Hz operation220°C insulation systemAluminum or copper windingsANSI ground padsCore ground strapIndoor ventilated enclosure - NEMA 1Paint — ANSI 61 finishProvisions for liftingRemovable front and rear panelsVibration isolating pads(2) 2 1/2 % full capacity tapsabove and below nominalConform to NEMA, ANSI, & IEEstandards for Dry TypeTransformersOSHPD Qualified

The standard indoor enclosure is NEMA 1, Category Cconstruction. Enclosures are suitable for lifting, jacking,rolling or skidding with provisions for lifting from thetransformer base. High voltage and low voltage ANSIground pads are provided.

The enclosure paint finish is neat, clean and highlyresistant to corrosion. Metal surfaces are thoroughlycleaned of scale, oil, grease, rust and other foreignmatter before painting. Unless specified otherwise,paint color shall be ANSI 61 (light gray). NEMA 3Rand NEMA 4 outdoor enclosures are available forapplications that prohibit indoor installation.

Generally, low voltage (LV) windings less than 2,400volts are either multi-conductor barrel or sheetconductor types. Multi-conductor windings may bemore economical and preferred in smaller kVA lowvoltage applications in which the current and axial shortcircuit forces are relatively small. High voltage (HV)windings 2,400 volts or greater may be single-sectionbarrel, multi-section barrel or disk types. Ventilated dry-type coils may be either round, oval or rectangularthrough about 2,000 kVA. Transformers larger than 2,000 kVA generally are designed with round windingsunless there are special considerations, such as limitingdimensions.

The transformer cores are constructed of non-aging,high grade, grain oriented silicon steel laminations withhigh magnetic permeability. Magnetic flux densities arekept well below the saturation point. Core laminationsare free of burrs and stacked without gaps. MiteredSTEPLAP construction cores may be provided whenspecified. The core clamping brackets are designedto provide even distribution of clamping forces to thecore yokes and legs. The core is electrically isolatedexcept for the factory-installed core ground strap,which provides a single path from the core to ground.

All units rated 750 kVA and higher can have added fans,increasing capacity in all current carrying parts for thefan-cooled rating and capability to add a thermometerrelay to control fans. When specified, the transformershall be provided with fans to give a forced air-cooledrating of 33% above the self-cooled rating. Controlwiring (wire markers included), a thermal sensor and afan controller will be supplied.

Fans for 133% FA kVA ratingFuture fan wiring and controlGround bus - full length copperImpact indicator - MechanicalOutdoor enclosure NEMA 3RPaint — polyurethane overcoatScreened ventilation openingsEnclosure — hinged panelsEnclosure — knockdownElectrostatic ShieldSpace heatersTemperature monitor/fancontrollerThermostat for spaceheatersBus to EndFlex LeadsLow Noise

D RY

STANDARD FEATURES

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ENCLOSURE

COILS

CORE

FORCED AIR COOLING

ACCESSORIES OROPTIONS

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The transformer shall be designed to meetor exceed ANSI and NEMA sound levels fordry-type transformers. As an option, trans-formers designed at -3dB to -10dB belowANSI and NEMA standard sound levels areavailable.

When specified, transformers can be close-coupled to a multitude of High Voltage andLow Voltage Switchgear.

Each transformer shall receive thefollowing standard production tests inaccordance with ANSI C57.12.90

• Resistance test• Polarity & phase relation test• Turns ratio test at all tap positions• No-load loss & exciting current test• Impedance and load-loss test• Applied potential test• Induced potential test

Test results, when requested, areavailable by transformer serial number. In addition, the following special tests can be performed on each transformer in accordance with applicable ANSIstandards at an additional cost.

• Temperature test• Impulse test• Sound test• Partial discharge test

• Low loss designs• Rectifier transformer designs• Special ambient designs• High overload capacity designs• Special/low sound level designs• 50 Hz designs• Series/parallel windings• Retrofit to specific dimensions• K-factor ratings• Special Paint• Auto transformers• PCB replacement• Grounding transformers• Zig-zag transformers• Scott-T transformers• 6, 12, 18, 24 and 36-pulse transformers• Drives isolation transformers

Nominal SystemVoltage kV

StandardBIL kV

Option BILkV

1.2 10 302.5 30 455.0 30 45,608.7 45 60,95

15.0 60 95,11022.0 110 125

Equivalent TwoWinding Base kVA

Self-CooleddB

Fan-CooleddB

500 60 N/A750 64 67

1000 64 681500 65 692000 66 712500 68 713000 68 73

AUDIO SOUND LEVELS

Vent-Dry Sound Levels: (dB)

Product Coordination

Testing

Special Design orApplication

VENT-DRY BASIC IMPULSERATINGS

DOE 2016EnergyEfficiency

T Y P E

20-45 kV 46-95 kV >= 96 kVEfficiency(%) Efficiency(%) Efficiency(%)

Efficiency(%) Efficiency(%) Efficiency(%)

BILkVA

Single Phase

15 98.10 97.86 NA25 98.33 98.12 NA

37.5 98.49 98.30 NA50 98.60 98.42 NA75 98.73 98.57 98.53

100 98.82 98.67 98.63167 98.96 98.83 98.80250 99.07 98.95 98.91333 99.14 99.03 98.99500 99.22 99.12 99.09667 99.27 99.18 99.15833 99.31 99.23 99.20

20-45 kV 46-95 kV >= 96 kV

15 97.50 97.18 NA30 97.90 97.63 NA

Three Phase

kVABIL

45 98.10 97.86 NA75 98.33 98.13 NA

112.5 98.52 98.36 NA150 98.65 98.51 NA225 98.82 98.69 98.57300 98.93 98.81 98.69500 99.09 98.99 98.89750 99.21 99.12 99.021000 99.28 99.20 99.111500 99.37 99.30 99.212000 99.43 99.36 99.282500 99.47 99.41 99.33

MGM Transformer Company is pleased to list a sample of our satisfied customers. For more information, please contact the factory.

Drives IndustryRockwell Automation CegelecRockwell Reliance Lloyd Controls

lliH ssoR-odlasnABBAToshiba Control Techniques

Industrial & CommercialGeneral Electric MotorolaSiemens LTV SteelProctor & GambleEATONBMWAmazoneBayBoeing

ToyotaHewlett-PackardAT&TLogan AluminumConstelliumChrysler

Aramco

PetrochemicalAmoco Oil Shell Oil

noxxEocrAChevron UnocalMobil Oil Premcor

Pulp & PaperWeyerhauser Georgia-PacificEddy Paper

Municipalities & UtilitiesSouthern California Edison Pacific BellCommonwealth Edison Iowa Power & LightL.A. Department of Wisconsin Power & Light

Water & Power Pacific Gas & ElectricMetropolitan Water District Edison InternationalFlorida Power & Light PSEG Power LLC

Architects & ContractorsARAMCO Fluor DanielBechtel Ralph M. Parsons Co.Brown & Root Black & VeatchJacobsMustangBergelectric

Rosendin ElectricCupertino Electric

Universities / LabsnagihciMfoytisrevinUALCU

UC Berkeley University of MinnesotaUC San Diego Lawrence Livermore LabsFermilab SUNYArgonne National Lab

Wind-Turbine Power GenerationPalm Springs, California Tehachapi Pass, CaliforniaSolar City

Q u a l i t yy o u c a n s e e

Bulletin 30-0600 3/8/17 Printed in U.S.A.

MGM Transformer Company5701 Smithway Street, City of Commerce, CA 90040

1-800-423-4366 Fax: (323) 726-8224 Email: sales@mgmtransformer.com www.mgmtransformer.com