Harmonic Mitigating TransformersProduct Focus

Energy Savings Through

Harmonic Mitigation

HarmonicMitigatingTransformersEnergy SavingsThroughHarmonicMitigation

Today’s Issues and Needs

As our world becomes even more dependent on electrical and electronic equipment, there is anincreased likelihood that operations will experiencethe negative effects of harmonic distortion. The productivity and efficiency gains achieved fromincreasingly sophisticated pieces of equipment have a drawback: increased harmonic distortion in the electrical distribution system. Eaton’s Cutler-Hammer�harmonic mitigating transformers (HMTs) are a leading solution to help eliminate these harmfulharmonics and improve your system reliability.

1. Eaton Corporation’s Harmonic MitigatingTransformer (HMT)

2 EATON CORPORATION — Harmonic Mitigating Transformers

1

EATON CORPORATION — Harmonic Mitigating Transformers 3

2. Graph A

Typical waveform of single-phase devices.

3. Graph B

Components of a non-linear waveform.

What are Harmonics?

An understanding of how harmonics are generated andhow they flow in a power system aids in the understand-ing of how HMTs can provideharmonic mitigation. Electronicequipment requires dc voltageto operate. Rectifiers andcapacitors are used to convertac voltage to dc voltage withinthe equipment. These devicesare frequently referred to asswitch mode power supplies(SMPS). As the capacitorscharge and discharge duringthis conversion, the capacitordraws current in pulses, not ata continuous rate. This irregularcurrent demand, as depicted in Graph A, distorts the linear60 Hz sine wave. As a result,these types of loads are commonly referred to as non-sinusoidal, or non-linear.

As shown in Graphs A and B,the waveform created by thenon-linear source is actually the mathematical sum of several sine waves, each with a different frequency and magnitude. Each of theseindividual waveforms is called a harmonic, and is identified by its frequency relative to thefundamental frequency, 60 Hz.In other words, each individual

harmonic is identified by a number, which is the number of complete cycles the specificharmonic goes through in a single 60 Hz cycle.

In Graph B, the fundamentalfrequency is 60 Hz. The funda-mental frequency is assignedthe harmonic number of 1, and is the benchmark for allother harmonic numbering. Thefundamental, 60 Hz sine wavecompletes 60 full cycles in onesecond. The 3rd harmonic completes three full cycles in the time it takes the fundamental to complete just one cycle, or 180 cyclesper second. Likewise, the 5thharmonic completes five fullcycles in the time it takes thefundamental harmonic to complete a single cycle, which equates to 300 Hz(cycles per second). Odd multiples of the 3rd harmonic(3rd, 9th,15th, 21st, etc.) arecommonly referred to as triplen harmonics.

The proliferation of electronicequipment (including comput-ers, fax machines, copiers,electronic ballasts, office equipment, cash registers, slotmachines, electronic monitoringdevices, video games, medicaldiagnostic equipment, etc.)is what makes single-phase

devices the most commonsource of harmonics. Thesedevices generate a typicalwaveform shown in Graph A,and have a harmonic profile as shown in the inset table to the right.

Fundamental

7th3rd

5th

TYPICAL HARMONIC PROFILE OF SINGLE-PHASE SMPS

Harmonic Magnitude1 1.0003 0.8105 0.6067 0.3709 0.15711 0.02413 0.06315 0.079

60 Hz Fundamental

SMPS Current Draw

2

3

4

What Problems doHarmonics Cause?

The distorted current waveformthat is created by non-linear loadscan cause many problems in anelectrical distribution system.While all buildings with modernload have harmonic content —the real question to ask is, “Arethe harmonic levels at a pointwhere they can cause misopera-tion and disruption to the loadwithin the building.” It is a myththat K-factor rated transformersprovide harmonic treatment.Rather they are oversized to with-stand the destructive effects ofthe additional heat generated by harmonic currents in the trans-former's windings. Their largersize means more watts will bewasted (compared to a standardtransformer) to feed the samesize load.

In many instances, the harmfuleffects of harmonics are toosevere, and simply toleratingthem is not an acceptable option.Harmonic currents can causeexcessive heating in distributiontransformers. This additional heat not only reduces the lifeexpectancy of a transformer, it also reduces the usable capacity of the transformer. This additional heat waste meansa higher than necessary electricbill for the building owner to feedthe non-linear load.

EATON CORPORATION — Harmonic Mitigating Transformers

An important characteristic ofharmonics is that they are trans-mitted upstream from the load,to the transformer’s secondarywindings, through the primarywindings of the transformer,back to the service entrance, and eventually to the utility lines.

Harmonic currents flowingupstream from non-linear loads,through the system impedanceof cables and transformers, cre-ate harmonic voltage distortion.When linear loads, like motors,are subjected to harmonic volt-age distortion, they will draw anon-linear harmonic current. Aswith distribution transformers,harmonic currents causeincreased heating, due to ironand copper losses, in motors and generators. This increasedheating can reduce the life of themotor, as well as the motor’sefficiency. In electrical cables,harmonic currents may also create increased heating, whichcan lead to premature aging ofthe electrical insulation. Nuisancetripping of the circuit breakersprotecting the cable may alsooccur. Communications equip-ment and data processingequipment are especially susceptible to the harmfuleffects of harmonics becausethey rely on a nearly perfectsinusoidal input. This equipmentmay malfunction, or even fail,when installed in systems thatare rich in harmonics.

The costs associated with downtime resulting from themalfunction or failure of electricalor electronic equipment can bestaggering. These costs can easily surpass thousands, if notmillions, of dollars per hour inlost production or lost productiv-ity. In addition to thesewell-defined costs associatedwith the most catastrophic ofharmonic effects, there aremany less quantitative costs that are often overlooked whenevaluating the need for harmonicmitigation. The increased heatingcaused by harmonics in motorsand transformers increases the cooling requirements in air-conditioned areas. The sameincreases in heating result inincreased maintenance costsand more frequent equipmentreplacement in order to avoidfailures that could shut down abuilding for a period of time.

What do HMTs do?

HMTs are an economical solu-tion in the battle against theharmful effects of harmonics.HMTs are highly reliable passivedevices; they don’t have anymoving parts and they are typically energized 24/7, 365days a year. This means thatthey are always “on the job”treating harmonics, regardless

of the level of load they are serving at a given point intime. Whenever the HMT isenergized, it will provide harmonic treatment.

Harmonic mitigating transform-ers are commonly referred to as“phase-shifting” transformers.The HMT offering from EatonCorporation has three-wire con-nected primary windings andfour-wire connected secondarywindings. Because of the fundamental changes to themagnetics of the transformerwinding, this allows a trans-former to be designed in a widevariety of different phase-shifts(-15°, 0°, +15°, 30°). In standarddelta-wye transformers, includ-ing K-factor rated transformers,triplen harmonics are passedfrom the secondary windingsinto the primary delta windingswhere they flow and cause sub-stantial additional watt loss. InHMTs, the electromagnetic fluxcancellation created by thezigzag winding configuration prevents 3rd and other triplenharmonics from being transmit-ted into the primary deltawinding. Harmonic treatment is provided entirely by electro-magnetic flux cancellation; nofilters, capacitors, or other such devices are used. It isimportant to remember that theharmonic currents still flow tothe secondary windings.

Excessive heating in distribution transformersIncreased cooling load on buildingsIncreased heating in motors and generatorsIncreased heating in cablesNuisance tripping of breakersMalfunction or failure of communications and data processing equipment

Problems Caused By HarmonicsProblems Caused By Harmonics

5

Benefits of Installing HMTs

In addition to improved system reliability and reducedmaintenance costs, HMTs alsohave excellent energy-savingcharacteristics. With the cost of electricity continuing toincrease around the world,there is an ever-increasing inter-est in energy-efficient products.In many facilities, the cost ofelectricity is the second largestexpense, eclipsed only bysalaries and wages. As previ-ously mentioned, distributiontransformers are typically ener-gized 24/7, 365 days a year.Transformers consume energyeven when they are lightlyloaded or not loaded at all.Significant energy savings maybe attained if the no-load lossesof a transformer are reduced.NEMA� Standard TP-1addresses this issue by requir-ing high efficiency levels whena transformer is loaded at 35%of its full capacity. However,this standard applies to linearload profiles only and tests tovalidate compliance with NEMATP-1 are performed using linearloads. In actual applications, thegrowing presence of electronicdevices creates non-linear load profiles. Non-linear loadscause the losses in distribution

transformers to increase,thereby reducing their realizedefficiency. Therefore, NEMATP-1 efficiency compliance maynot be a true indication of theefficiency of a transformerexposed to non-linear loads.Though only a measure of linearload efficiency, Eaton’s familyof HMTs meets the efficiencystandards set forth in NEMAStandard TP-1. Because HMTsare intended to be installed insystems that contain high levels of non-linear loads,Eaton’s family of HMTs isdesigned to meet the NEMATP-1 efficiency levels whenapplied to non-linear load profiles with 100% harmonicdistortion, across a broad rangeof load levels, not just the 35%load level used in NEMA TP-1.These energy savings are realized over the entire life of the transformer.

EATON CORPORATION — Harmonic Mitigating Transformers

Transformer Efficiency — 75 kVA Example0.99

0.985

0.98

0.975

0.97

0.965

0.96

0.95515 25 35 50 75 100

Resistive Load100% Harmonic Load

1. Energy Bill Savings1

6 EATON CORPORATION — Harmonic Mitigating Transformers

Markets for HMTs

Educational Facilities

Harmonic-generating devicesexist in all regions of the country. Many educational facilities are found to be excel-lent candidates for HMTs. Thepeace-of-mind and security ofknowing that our schools’ electrical distribution systemsare being protected from theharmful effects of harmonics is important to people whomanage, maintain, teach andlearn in these facilities. Gradeschools across the country areadding computers to their class-rooms. Similarly, colleges anduniversities are taking advan-tage of the benefits of thecomputer, and students areusing computers in their dormitories. Today, the averagecollege student brings a stag-gering 18 electrical loads totheir dorm room — most ofwhich are non-linear loads.Many colleges also have laboratories and studying facilities that contain an ever-increasing number of electronic devices. An electrical failure resulting fromexcessive harmonics may result in the loss or corruptionof research data that took hoursor weeks or even years to

accumulate. Such failures mayalso necessitate that facultyand students be evacuatedfrom classrooms or dormitories.

Commercial Facilities

In commercial office buildings;customer service call-centers;insurance companies; govern-ment offices; and in the officespace of manufacturing facilities; the presence of computers, printers, copyingmachines and other electronicoffice equipment; along withfluorescent lighting ballasts,create an environment that isfull of harmonics. The produc-tivity losses that can resultfrom the loss of power in theseenvironments can be signifi-cant. Electronic data filesspecific to certain customers or operations can also becomecorrupted or lost as a result of the ill effects of harmonics.

Retail Facilities

Retail facilities such as electronic and appliance stores,as well as malls, plazas and grocery stores typically makeuse of electronic cash registersand fluorescent lighting. Lostsales resulting from a blackouttraced back to harmonics canadd up quickly. The installationof an HMT can help preventthese losses.

Medical Facilities

Medical facilities are also ideallocations for HMTs. Most mod-ern diagnostic and analysisequipment is electronic.Excessive harmonics couldcause personal records or med-ical test data to be corrupted ordestroyed. Recovery of this infor-mation would be very costly.

Gaming Industry

Harmonic-generating devicesare so common that the list ofpotential applications is growingdaily. In more recent applica-tions, HMTs can be beneficial incasinos, racetracks and off-track-gaming parlors. In thesefacilities, not only are the gam-ing losses that can result froma power failure of concern, butjust imagine the security issuesand risks involved.

In all of the aforementionedapplications, the energy sav-ings that can result from theapplication of an HMT can besubstantial. The normal life ofa distribution transformer isrecognized as being 20 yearsor greater. In many installa-tions, the life-cycle energysavings alone offer a quickpayback on the investment.Once the initial investment isrecovered, the energy savingscan be realized for years andyears to come.

Product Selection

As with other harmonic mitigation techniques, in orderto obtain the maximum benefitoffered by the HMT solution,the harmonic content in theelectrical distribution systemshould be identified. Thereare a wide variety of metersavailable on the market that canassist in determining which har-monics exist in a system. TheEaton Electrical Services &Systems (EESS) team has yearsof experience in identifying harmonics and their sources.With field service engineerslocated throughout the country,they are readily available to per-form this on-site testing.

If the precise harmonic profileof a load is not known, it is stillpossible to select HMTs thatwill provide the benefits of harmonic treatment. By know-ing the general characteristicsof the loads, HMTs can beeffectively selected. The basicquestion that needs to beanswered is “Are the loads that the transformer is feedingsingle-phase or are they three-phase?” This question appliesto the ultimate loads, not theintermediate loads such as apanelboard. Once this questionhas been answered, the selec-tion of an HMT can commence.

“In all of the aforementioned applications, the energy savings that can result from the application of an

HMT can be substantial. The normal life of a distribution transformer is recognized as being 20 years or greater. In many installations, the life-cycle

energy savings alone offer a quick payback on the investment. Once the initial investment is recovered, the energy savings

can be realized for years and years to come.”

1 The most common ratings are shown. Contact Eaton for availability of additional ratings.When TVSS option is chosen, case and frame sizes may be increased — check with factory for final case dimensions.

X 48 48 M 28 28 F 30 TCUEE TCUEE NON

Secondary Voltage 1

28 = 208/120 Vac47 = 480/277 Vac

Modifications 12

T = Single Thermal Sensor (190ºC)TT = Two Thermal Sensors (190ºC and 175ºC)

X = 50/60 Hz CU = Copper Windings (Std.)

EE = Energy Efficient (Std.)SS = Stainless Steel Enclosure

Phase Shift

NON = 0º

POS = +15ºNEG = -15º

Temperature

Rise

F = 115ºC T = 150ºC

B = 80ºC

Primary

Voltage 1

48 = 480 Vac60 = 600 Vac

kVA Rating

15 = 15 30 = 30 45 = 45 75 = 75 12 = 112.5 49 = 150 22 = 225 33 = 300

Tap

Arrangement

M= 2 @ +2.5%, 4 @ -2.5%

D = 2 @ +2.5%, 2 @ -2.5%

29 = 208 Vac THR = 30º

40 kA per Phase TVSS Installed on Transformer Primary80 kA per Phase TVSS Installed on Transformer Primary 160 kA per Phase TVSS Installed on Transformer Primary40 kA per Phase TVSS Installed on Transformer Secondary80 kA per Phase TVSS Installed on Transformer Secondary (Standard)160 kA per Phase TVSS Installed on Transformer Secondary40 kA per Phase TVSS Installed on Transformer Primary with Indicating Light80 kA per Phase TVSS Installed on Transformer Primary with Indicating Light160 kA per Phase TVSS Installed on Transformer Primary with Indicating Light40 kA per Phase TVSS Installed on Transformer Secondary with Indicating Light80 kA per Phase TVSS Installed on Transformer Secondary with Indicating Light160 kA per Phase TVSS Installed on Transformer Secondary with Indicating Light

P1 =P2 =P3 =S1 =S2 =

S3 =P1P =

P2P =

P3P =

S1P =

S2P =

S3P =

2

7

1

1. Harmonic Mitigating TransformerCatalog Numbering System

As previously shown in Graph Aon Page 3, the harmonic profileof single-phase electronicdevices is dominated by the 3rdand other triplen harmonics. Triplen harmonics are treated

EATON CORPORATION — Harmonic Mitigating Transformers

in the secondary windings of asingle HMT transformer.

Three-phase loads (and to anextent, single-phase loads) generate a harmonic profile that has predominantly 5th

and 7th harmonics. Cancellationof 5th, 7th, 17th and 19th harmonic currents is attainedthrough the use of two or more transformers with a 30°phase-shift between them.

These harmonic currents passthrough the transformers andare cancelled at the first common (or shared) electricalbus. A few examples of a common electrical bus include

8 EATON CORPORATION — Harmonic Mitigating Transformers

a panelboard, a switchboardand bus duct. Any electricalequipment that feeds all of the transformers used in a harmonic cancellation schemeis likely to be a common bus.Possible phase-shift combina-tions that could be used to treat these higher order harmonic currents would be the pairing of 0° and 30° transformers, or the pairing of -15° and +15° transformers. It is not necessary for thesetransformers to be in the sameroom, or on the same floor, aslong as they are fed from acommon point — a commonelectrical bus.

In instances where a trans-former is feeding a mix ofsingle-phase and three-phaseloads, pairs of harmonic mitigat-ing transformers with a 30° phase-shift between them offer treatment of triplen harmonics, as well as 5th, 7th,17th and 19th harmonics. The30° phase-shift between thetransformers treats 5th, 7th,17th and 19th harmonics at thecommon electrical bus; while atthe same time, the secondaryzigzag windings treat triplenharmonics at the transformer.

Pre-Installed TVSS Option

The application and use of the Eaton HMT is normally in“electrically sensitive” areas that usually incorporate otherpower quality devices to ensureproper and prolonged operationof the equipment. This usuallyincludes a Transient VoltageSurge Suppression (TVSS)device to protect against both internal and external high-voltage transient spikes.The Eaton HMT is availablewith a variety of TVSS protection sizes (40, 80 or 160 kA per phase) and can befactory installed either on theprimary or the secondary of thetransformer. Some benefits ofordering this factory installedoption are:• Helps to limit field

wiring errors• Minimizes installation costs• Provides a single provider

of the equipment

An optional indicator light can be mounted on the front of the transformer enclosure to provide a visual indication ifthe TVSS fails to function whenthe transformer is energized.

Limited Sound (LS) Option

The physical location of theelectrical dry-type transformerin today's design has a ten-dency to move it closer andcloser to the building occupantsmeaning that its audible noisecan start to become an issue.In the past, the transformerwas in its own electrical roomand audible noise was not asmuch of a concern. To helpmeet these needs, the EatonHMT offers the option of aLow-Sound (LS) characteristicwhich means the audible noiseproduced by the transformerwill be -3 dB lower than theindustry standard (NEMA ST20)levels. As audible noise ismeasured on a logarithmicscale, every -3 dB of changerepresents a lowering of abouthalf the perceived noise comingfrom the transformer (note thatsound levels are measured in aspecialized sound room, not atthe installation).

These low-noise transformers are ideal for noise-sensitiveinstallations such as schools,hospitals, libraries and offices.Proper installation procedures should be used to achieve maximum benefit.

Warranty

Eaton’s family of HMTs carriesa 10-year, pro-rated warrantyagainst failure.

9EATON CORPORATION — Harmonic Mitigating Transformers

1. Typical Application of Type NONTransformer with a Standard Delta-Wye Transformer

2. Optimum Application of Type NON andType THR Transformers

ApplicationInformation

The closer an HMT can belocated to the load, the greaterthe benefits of harmonic treatment. Installation of a large capacity HMT at the service entrance of a largebuilding would certainly providesome harmonic treatment.However, installation of severalsmaller rated HMTs, perhapsone or more on each floor of a building, provides greater benefits that will be noticedthroughout the facility and onthe energy bill. This comple-ments the cost efficiencies thatcan be gained by distributinghigher voltages through smallercables to the point where asafer, lower voltage is neededto operate equipment.

When connecting the loads to the transformer, it is important to remember that the balanced portion of the harmonic loads will be treated.To achieve the maximum harmonic treatment, when considering the triplen harmonics that are treated inthe secondary windings, eachphase should be balanced andthe harmonic profile of theloads should be as similar aspossible. When treating 5th,

7th and higher order harmonicsby utilizing multiple transform-ers, the transformers andloading should be identical, butsince we’re adding in “nega-tives” (through the change ofthe phase shift angles) the impact on the system will bemuch greater than using juststandard, K-rated or TP-1 transformers (which will allhave similar phase shifts).

For example, two 75 kVA HMTscan be “paired” with a single150 kVA HMT to provide maxi-mum harmonic performance. Inreal-world situations, it is nearlyimpossible to have perfectlymatched loads. However, thebenefits of treating harmonics,even in situations where theloads are unbalanced, are a farsuperior option than to not treatthem at all.

When a delta-wye transformer exists in an electrical distribution system, the addition of a Type NON transformer offers an economical solution for treating harmonic currents. The 30º phase-shift created between a Type NON harmonic mitigating transformer and a delta-wye transformer (standard transformer or K-Factor transformer) provides treatment of 5th, 7th, 17th and 19th harmonic currents. These harmonic currents are cancelled in the common electrical bus that feeds the transformers. Additionally, triplen (3rd, 9th, 15th, etc.) harmonic currents generated by the loads connected to the Type NON transformer will be treated in the secondary windings of the Type NON transformer due to its low zero sequence impedance 1. When using two or more transformers to treat harmonics, it is better that the load be split equally between the transformers to receive the maximum benefit.

Type NON

Δ-Y Transformer

Type NON

Long Run

Δ-Y TransformerElectrical Bus

Electrical Panel Feeding Single-Phaseand/or Three-Phase Nonlinear Loads

When you’re searching for an optimum harmonic correction solution in an electrical distribution system, the combination of a Type NON and Type THR transformer offers a great solution. The 30º phase-shift created between Type NON and Type THR harmonic mitigating transformers provides treatment of 5th, 7th, 17th and 19th harmonic currents. These harmonic currents are cancelled in the common electrical bus that feeds the transformers. Additionally, triplen (3rd, 9th, 15th, etc.) harmonic currents generated by the loads will be treated in the secondary windings of HMTs. This will ensure that these currents will not circulate in the primary of the transformer creating additional heat, voltage distortion, and wasted energy loss. When using two or more transformers to treat harmonics, it is better that the load be split equally between the transformers to receive the maximum benefit.

Type NON

Type THR

Type NON

Long Run

Type THRElectrical Bus

Electrical Panel Feeding Single-Phaseand/or Three-Phase Nonlinear Loads

1

2

10 EATON CORPORATION — Harmonic Mitigating Transformers

TYPE NON HARMONIC MITIGATING TRANSFORMER SELECTION INFORMATION

ºC Wiring WeathershieldFull Cap. Taps Temp. Dimensions (Inches) Wt. Dimensions (mm) Wt. Diagram Catalog Style

kVA FCAN FCBN Type Rise H W D Lbs. H W D kg Frame Number Number Number480 Volts to 208/120 Volts, Shielded, Copper Windings, NEMA TP-1 Energy Efficient, 0-Degree Phase-shift (No Thermal Sensor)15 2@+2.5% 4@-2.5% DT-3 150 30 20-1/8 14-1/8 320 762 511 359 145 FR910A 200X WS31 X48M28T15CUEENON30 2@+2.5% 4@-2.5% DT-3 150 30 23 16-1/2 370 762 584 419 168 FR912B 200X WS38 X48M28T30CUEENON45 2@+2.5% 4@-2.5% DT-3 150 39-1/4 29 22 550 995 737 559 250 FR914D 200X WS39 X48M28T45CUEENON75 2@+2.5% 4@-2.5% DT-3 150 46-5/8 28 23 925 1183 710 584 420 FR916A 200X WS19 X48M28T75CUEENON112.5 2@+2.5% 4@-2.5% DT-3 150 56-1/4 31-1/4 24-1/4 1600 1427 790 616 726 FR917 200X WS34 X48M28T12CUEENON150 2@+2.5% 4@-2.5% DT-3 150 62-1/4 31-1/4 30-1/4 2170 1581 794 768 986 FR918A 200X WS34 X48M28T49CUEENON225 2@+2.5% 4@-2.5% DT-3 150 75 44-1/2 36 3100 1905 1130 914 1409 FR919X 201X WS35 X48M28T22CUEENON300 2@+2.5% 2@-2.5% DT-3 150 75 44-1/2 36 3300 1905 1130 914 1500 FR919X 201X WS35 X48M28T33CUEENON500 2@+2.5% 4@-2.5% DT-3 150 75 44-1/2 36 4800 1905 1130 914 2179 FR920X 201X WS35 X48M28T55CUEENON15 2@+2.5% 4@-2.5% DT-3 115 30 20-1/8 14-1/8 320 762 511 359 145 FR910A 200X WS31 X48M28F15CUEENON30 2@+2.5% 4@-2.5% DT-3 115 30 23 16-1/2 370 762 584 419 168 FR912B 200X WS38 X48M28F30CUEENON45 2@+2.5% 4@-2.5% DT-3 115 39-1/4 29 22 550 995 737 559 250 FR914D 200X WS39 X48M28F45CUEENON75 2@+2.5% 4@-2.5% DT-3 115 46-5/8 28 23 925 1183 710 584 420 FR916A 200X WS19 X48M28F75CUEENON112.5 2@+2.5% 4@-2.5% DT-3 115 56-1/4 31-1/4 24-1/4 1600 1427 790 616 726 FR917 200X WS34 X48M28F12CUEENON150 2@+2.5% 4@-2.5% DT-3 115 62-1/4 31-1/4 30-1/4 2170 1581 794 768 986 FR918A 200X WS34 X48M28F49CUEENON225 2@+2.5% 4@-2.5% DT-3 115 75 44-1/2 36 3600 1905 1130 914 1634 FR919X 201X WS35 X48M28F22CUEENON300 2@+2.5% 4@-2.5% DT-3 115 75 44-1/2 36 3500 1905 1130 914 1589 FR919X 201X WS35 X48M28F33CUEENON500 2@+2.5% 4@-2.5% DT-3 115 75 44-1/2 36 4800 1905 1130 914 2179 FR920X 201X WS35 X48M28F55CUEENON

Note: Information could change at any time. Please contact Eaton for details.

TYPE THR HARMONIC MITIGATING TRANSFORMER SELECTION INFORMATION

ºC Wiring WeathershieldFull Cap. Taps Temp. Dimensions (Inches) Wt. Dimensions (mm) Wt. Diagram Catalog Style

kVA FCAN FCBN Type Rise H W D Lbs. H W D kg Frame Number Number Number480 Volts to 208/120 Volts, Shielded, Copper Windings, NEMA TP-1 Energy Efficient, 30-Degree Phase-shift (No Thermal Sensor)15 2@+2.5% 4@-2.5% DT-3 150 30 20-1/8 14-1/8 320 762 511 359 145 FR910A 203X WS31 X48M28T15CUEETHR30 2@+2.5% 4@-2.5% DT-3 150 30 23 16-1/2 370 762 584 419 168 FR912B 203X WS38 X48M28T30CUEETHR45 2@+2.5% 4@-2.5% DT-3 150 39-1/4 29 22 550 995 737 559 250 FR914D 203X WS39 X48M28T45CUEETHR75 2@+2.5% 4@-2.5% DT-3 150 46-5/8 28 23 925 1183 710 584 420 FR916A 203X WS19 X48M28T75CUEETHR112.5 2@+2.5% 4@-2.5% DT-3 150 56-1/4 31-1/4 24-1/4 1600 1427 790 616 726 FR917 203X WS34 X48M28T12CUEETHR150 2@+2.5% 4@-2.5% DT-3 150 62-1/4 31-1/4 30-1/4 2170 1581 794 768 986 FR918A 203X WS34 X48M28T49CUEETHR225 2@+2.5% 4@-2.5% DT-3 150 75 44-1/2 36 3100 1905 1130 914 1409 FR919X 203X WS35 X48M28T22CUEETHR300 2@+2.5% 2@-2.5% DT-3 150 75 44-1/2 36 3300 1905 1130 914 1500 FR919X 203X WS35 X48M28T33CUEETHR500 2@+2.5% 4@-2.5% DT-3 150 75 44-1/2 36 4800 1905 1130 914 2179 FR920X 203X WS35 X48M28T55CUEETHR15 2@+2.5% 4@-2.5% DT-3 115 30 20-1/8 14-1/8 320 762 511 359 145 FR910A 203X WS31 X48M28F15CUEETHR30 2@+2.5% 4@-2.5% DT-3 115 30 23 16-1/2 370 762 584 419 168 FR912B 203X WS38 X48M28F30CUEETHR45 2@+2.5% 4@-2.5% DT-3 115 39-1/4 29 22 550 995 737 559 250 FR914D 203X WS39 X48M28F45CUEETHR75 2@+2.5% 4@-2.5% DT-3 115 46-5/8 28 23 925 1183 710 584 420 FR916A 203X WS19 X48M28F75CUEETHR112.5 2@+2.5% 4@-2.5% DT-3 115 56-1/4 31-1/4 24-1/4 1600 1427 790 616 726 FR917 203X WS34 X48M28F12CUEETHR150 2@+2.5% 4@-2.5% DT-3 115 62-1/4 31-1/4 30-1/4 2170 1581 794 768 986 FR918A 203X WS34 X48M28F49CUEETHR225 2@+2.5% 4@-2.5% DT-3 115 75 44-1/2 36 3600 1905 1130 914 1634 FR919X 203X WS35 X48M28F22CUEETHR300 2@+2.5% 4@-2.5% DT-3 115 75 44-1/2 36 3500 1905 1130 914 1589 FR919X 203X WS35 X48M28F33CUEETHR500 2@+2.5% 4@-2.5% DT-3 115 75 44-1/2 36 4800 1905 1130 914 2179 FR920X 203X WS35 X48M28F55CUEETHR

Note: Information could change at any time. Please contact Eaton for details.

11EATON CORPORATION — Harmonic Mitigating Transformers

Volts Tap

Primary

Secondary

NeutralBonded

Polarity:

BA

X2X0 X3 X1

H2H1 H3H1 H3

H2

X3

X0

X2

X1Shield

BA BA

8 76 5 4 3 2 1 8 76 5 4 3 2 1 8 76 5 4 3 2 1

504492480468456444432

1234567

NeutralBonded

Volts Tap

504492480468456444432

4 to 54 to 64 to 73 to 63 to 72 to 62 to 7

Primary

Secondary

Polarity:

BA

X2X0 X3 X1

H2 H3H1 H3

H2

X3

X0

X2

X1Shield

BA B

1 2 3

A

H1

4 5 6 7 81 2 3 4 5 6 7 81 2 3 4 5 6 7 8

NeutralBonded

Volts Tap

504492480468456444432

4 to 54 to 64 to 73 to 63 to 72 to 62 to 7

Primary

Secondary

Polarity:

BA

X1X0 X2 X3

H2 H3

H1

H3

H2

X3

X0

X2X1

Shield

BA BA

H1

1234 567 8 1234 1234567 8 567 8

1

2

3

1. Wiring Diagram 200X — For HMT-NONSized 15 – 150 kVA

2. Wiring Diagram 201X — For HMT-NONSized 225 – 500 kVA

3. Wiring Diagram 203X — For HMT-THRSized 15 – 500 kVA

© 2007 Eaton CorporationAll Rights ReservedPrinted in USAPublication No. BR00904002E / Z5251January 2007

Eaton Electrical Inc.1000 Cherrington ParkwayMoon Township, PA 15108United Statestel: 1-800-525-2000www.EatonElectrical.com

NEMA is the registered trademark and service mark of the National ElectricalManufacturers Association. Cutler-Hammer is a federally registered trademark of Eaton Corporation.

Eaton’s electrical business is a global leader in electricalcontrol, power distribution, and industrial automation productsand services. Through advanced product development, world-class manufacturing methods, and global engineering servicesand support, Eaton’s electrical business provides customer-driven solutions under brand names such as Cutler-Hammer�,Powerware�, Durant�, Heinemann�, Holec� and MEM�, whichglobally serve the changing needs of the industrial, utility,light commercial, residential, and OEM markets. For moreinformation, visit www.EatonElectrical.com.

Eaton Corporation is a diversified industrial manufacturer with2006 sales of $12.4 billion. Eaton is a global leader in electrical systemsand components for power quality, distribution and control; fluid powersystems and services for industrial, mobile and aircraft equipment; intelligenttruck drivetrain systems for safety and fuel economy; and automotive engineair management systems, powertrain solutions and specialty controls forperformance, fuel economy and safety. Eaton has 60,000 employees andsells products to customers in more than 125 countries. For more information,visit www.eaton.com.