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Small kVA 3 Phase Transformers Guide



Hammond General Purpose Distribution Transformers

To Order Hammond Transformers We Recommend TEMCo
Ph: 1-800-613-2290
Or 1-510-490-2187
Link: Hammond General Purpose Transformer

Hammond General Purpose Distribution TransformerENERGY EFFICIENCY (NEMA TP-1 & CSA C802.2)
Energy Efficiency (NEMA TP-1 & CSA C802.2) . . . Today’s Standard

In the past several years, there has been an accelerated rate of change to introduce energy efficiency standards for transformers in North America. Many products have preceded the initiatives for transformers in an overall effort to optimize manufactured goods for environmental concerns. Governments are encouraging users to consider energy efficient products like dry-type transformers, in an effort to help reduce carbon dioxide emissions.
In addition to the benefits to the environment, energy efficient transformers also can realize substantial savings in operating costs thereby having a direct impact on the initial investment evaluated over a period of time. The laws in North America state that all dry-type distribution transformers (as defined below) manufactured after January 1st, 2007 in the US and January 1st, 2005 in Canada, must meet the minumum energy efficiency standards outlined by NEMA TP-1-2002 (US) and C802.2 (Canada). The range of product covered by these standards are: The HPS lines of 600 volt class energy efficient distribution transformers illustrated in this section, meet these standards. They meet or exceed the minimum efficiencies required for NEMA & CSA. These efficiencies are at their maximum at 35% of the nameplate kVA transformer capacity.

The specifications covering energy efficiency in transformers in North America are the NEMA Standards
Publication, TP1-2002, “Guide for Determining Energy Efficiency for Distribution Transformers” and the CSA
Efficiency Standard Document C802, “Maximum Losses for Distribution, Power and Dry-Type Transformers”.
These specifications have carefully considered the total owning cost unique for industrial or commercial installations where the load factor is an integral part of the efficiency rating.

Product Features and Applications:

HPS offers three lines of energy efficient distribution transformers, they include:
Linear Load General Purpose Transformers
General purpose distribution transformers are rated for 600 volts and below. They are generally used for
supplying appliance, lighting, heating, motorized machine and power loads from electrical distribution systems.
They are either ventilated, totally enclosed, or encapsulated (potted). For non-linear loads, all standard TP1
distribution transformers have to be derated to allow for additional heat due to harmonic losses.
Non-Linear Load K-Factor Transformers
The use of k-factor distribution transformers has become a popular means of addressing harmonic related
overheating problems where electronic ballasts, drives, personal computers, telecommunications equipment,
broadcasting equipment and other similar power electronics are found in high concentrations. These non-linear
loads generate harmonic currents which can substantially increase transformer losses. The k-rated transformer
has a more rugged design intended to prevent failure due to overheating. K-factor is defined as a ratio between the additional losses due to harmonics and the eddy current losses at 60Hz. It is used to specify transformers for non-linear loads. Transformers with a rated k-factor of 4, 13, 20 and other are available.
Harmonic Mitigating Transformers
Harmonic Mitigating transformers are superior to k-rated and general purpose transformers in that they reduce
voltage distortion (flat-topping) and power losses due to current harmonics created by single-phase, non-linear
loads such as computer equipment. Secondary windings are arranged to cancel zero sequence fluxes and
eliminate primary winding circulating currents. They treat zero sequence harmonics (3rd, 9th and 15th) within the
secondary windings and 5th and 7th harmonics upstream with appropriate phase shifting. Dual output, phase shifting Harmonic Mitigating Transformers provide extremely low output voltage distortion and input current distortion even under severe non-linear load conditions (Data Centers, Internet Service Providers, Telecom Sites, Call Centers, Broadcasting Studios, etc.). Combining zero sequence flux cancellation with phase shifting treats 3rd, 5th, 7th, 9th, 15th, 17th and 19th harmonics within its secondary windings.
Features of Harmonic Mitigating Transformers:
•Prevents voltage flat-topping caused by non-linear loads
• Reduces upstream harmonic currents
• Eliminates transformer overheating and high operating temperatures
• Eliminates primary winding circulating current
• Saves energy by reducing harmonic losses
• Maintains high energy efficiency even under severe non-linear loading conditions
• Electrostatic shielding for high frequency noise attenuation
• Reduces voltage distortion to prevent premature equipment failure
• Restores ride-through capability of computer equipment
• Treats power quality harmonic issues which k-rated transformers do not address
• Suitable for high k-factor loads
• Reduces current distortion at UPS, generator or Utility service
• Improves Upstream Total Power Factor
• Exceeds NEMA TP1, CSA C802.2-00 EnergyStar®
• Helps meet IEEE Standard 519 harmonic limits

HPS Energy Efficient Distribution Transformer Product Offering:

Energy efficient general purpose transformers are designed for linear loads and are most frequently used for
applications such as commercial buildings which will supply a variety of general loads.
HPS Sentinel (part number prefix nmk or nmf)
• Meets TP1 and C802.2 efficiencies at 35% of rated load.
• Efficiencies are calculated under a linear load profile.
• Copper and Aluminum Available.
HPS SuperSentinel (part number prefix smk or smf)
• Exceeds TP1 and C802.2 efficiencies at an operating range from 35% to 65% of rated load.
• Efficiency performance will be 25% better than TP1 and C802.2 standards when measured under a linear
load profile.
• Copper and Aluminum Available.

HPS Sentinel

ENERGY EFFICIENT GENERAL PURPOSE DISTRIBUTION TRANSFORMER
ALUMINUM WOUND, SINGLE PHASE

Selection Charts

208 Primary Volts 120/240 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMF015BE
25 NMF025BE
37.5 NMF037BE
50 NMF050BE
75 NMF075BE
100 NMF100BE
150 NMF150BE
167 NMF167BE

240/480 Primary Volts 120/240 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMF015LE
25 NMF025LE
37.5 NMF037LE
50 NMF050LE
75 NMF075LE
100 NMF100LE
150 NMF150LE
167 NMF167LE

277 Primary Volts 120/240 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMF015FE
25 NMF025FE
37.5 NMF037FE
50 NMF050FE
75 NMF075FE
100 NMF100FE
150 NMF150FE
167 NMF167FE

416 Primary Volts 120/240 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMF015HE
25 NMF025HE
37.5 NMF037HE
50 NMF050HE
75 NMF075HE
100 NMF100HE
150 NMF150HE
167 NMF167HE

600 Primary Volts 120/240 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMF015PE
25 NMF025PE
37.5 NMF037PE
50 NMF050PE
75 NMF075PE
100 NMF100PE
150 NMF150PE
167 NMF167PE

SINGLE PHASE, EXPORT MODEL

190/200/208/220 X 380/400/416/440 Primary Volts120/240 Secondary Volts 50/60 Hz

KVA CATALOG NO.
15 NMF015XE
25 NMF025XE
37.5 NMF037XE
50 NMF050XE
75 NMF075XE
100 NMF100XE
150 NMF150XE
167 NMF167XE

COPPER WOUND, SINGLE PHASE

208 Primary Volts 120/240 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMF015BEC
25 NMF025BEC
37.5 NMF037BEC
50 NMF050BEC
75 NMF075BEC
100 NMF100BEC
150 NMF150BEC
167 NMF167BEC

 

240/480 Primary Volts 120/240 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMF015LEC
25 NMF025LEC
37.5 NMF037LEC
50 NMF050LEC
75 NMF075LEC
100 NMF100LEC
150 NMF150LEC
167 NMF167LEC

277 Primary Volts 120/240 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMF015FEC
25 NMF025FEC
37.5 NMF037FEC
50 NMF050FEC
75 NMF075FEC
100 NMF100FEC
150 NMF150FEC
167 NMF167FEC

416 Primary Volts 120/240 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMF015HEC
25 NMF025HEC
37.5 NMF037HEC
50 NMF050HEC
75 NMF075HEC
100 NMF100HEC
150 NMF150HEC
167 NMF167HEC

600 Primary Volts 120/240 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMF015PEC
25 NMF025PEC
37.5 NMF037PEC
50 NMF050PEC
75 NMF075PEC
100 NMF100PEC
150 NMF150PEC
167 NMF167PEC

SINGLE PHASE, EXPORT MODEL

190/200/208/220 X 380/400/416/440 Primary Volts120/240 Secondary Volts 50/60 Hz

KVA CATALOG NO.
15 NMF015XEC
25 NMF025XEC
37.5 NMF037XEC
50 NMF050XEC
75 NMF075XEC
100 NMF100XEC
150 NMF150XEC
167 NMF167XEC

HPS Sentinel

600 VOLT CLASS ENERGY EFFICIENT GENERAL PURPOSE DISTRIBUTION TRANSFORMER

SELECTION CHARTS

ALUMINUM WOUND, THREE PHASE

208 Primary Volts 208Y/120 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015BB
30 NMK030BB
45 NMK045BB
75 NMK075BB
112.5 NMK112BB
150 NMK150BB
225 NMK225BB
300 NMK300BB
500 NMK500BB
750 NMK750BB

208 Primary Volts 480Y/277 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015BK
30 NMK030BK
45 NMK045BK
75 NMK075BK
112.5 NMK112BK
150 NMK150BK
225 NMK225BK
300 NMK300BK
500 NMK500BK
750 NMK750BK

240 Primary Volts 208Y/120 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015DB
30 NMK030DB
45 NMK045DB
75 NMK075DB
112.5 NMK112DB
150 NMK150DB
225 NMK225DB
300 NMK300DB
500 NMK500DB
750 NMK750DB

240 Primary Volts 480Y/277 Secondary Volts 60 Hz
 

KVA CATALOG NO.
15 NMK015DK
30 NMK030DK
45 NMK045DK
75 NMK075DK
112.5 NMK112DK
150 NMK150DK
225 NMK225DK
300 NMK300DK
500 NMK500DK
750 NMK750DK

240 Delta Primary Volts 208/120 CT Secondary Volts 60Hz

KVA CATALOG NO.
15 NMK015KB
30 NMK030KB
45 NMK045KB
75 NMK075KB
112.5 NMK112KB
150 NMK150KB
225 NMK225KB
300 NMK300KB
500 NMK500KB
750 NMK750KB

480 Delta Primary Volts 240 Delta/120 CT Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015KD
30 NMK030KD
45 NMK045KD
75 NMK075KD
112.5 NMK112KD
150 NMK150KD
225 NMK225KD
300 NMK300KD
500 NMK500KD
750 NMK750KD

480 Delta Primary Volts 480 Delta/277 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015KK
30 NMK030KK
45 NMK045KK
75 NMK075KK
112.5 NMK112KK
150 NMK150KK
225 NMK225KK
300 NMK300KK
500 NMK500KK
750 NMK750KK

600 Delta Primary Volts 208Y/120 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015PB
30 NMK030PB
45 NMK045PB
75 NMK075PB
112.5 NMK112PB
150 NMK150PB
225 NMK225PB
300 NMK300PB
500 NMK500PB
750 NMK750PB

600Y Primary Volts 240 DELTA Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015PD
30 NMK030PD
45 NMK045PD
75 NMK075PD
112.5 NMK112PD
150 NMK150PD
225 NMK225PD
300 NMK300PD
500 NMK500PD
750 NMK750PD

600 Delta Primary Volts 480Y/277 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015PK
30 NMK030PK
45 NMK045PK
75 NMK075PK
112.5 NMK112PK
150 NMK150PK
225 NMK225PK
300 NMK300PK
500 NMK500PK
750 NMK750PK

COPPER WOUND, THREE PHASE

240 Delta Primary Volts 480Y/277 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015DKCN
30 NMK030DKC
45 NMK045DKC
75 NMK075DKC
112.5 NMK112DKC
150 NMK150DKC
225 NMK225DKC
300 NMK300DKC
500 NMK500DKC
750 NMK750DKC

480 Delta Primary Volts 208Y/120 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015KBCN
30 NMK030KBC
45 NMK045KBC
75 NMK075KBC
112.5 NMK112KBC
150 NMK150KBC
225 NMK225KBC
300 NMK300KBC
500 NMK500KBC
750 NMK750KBC

480 Delta Primary Volts 240 Delta/120 CT Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015KDCN
30 NMK030KDC
45 NMK045KDC
75 NMK075KDC
112.5 NMK112KDC
150 NMK150KDC
225 NMK225KDC
300 NMK300KDC
500 NMK500KDC
750 NMK750KDC

COPPER WOUND, THREE PHASE

480 Delta Primary Volts 408Y/277 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015KKCN
30 NMK030KKCN
45 NMK045KKC
75 NMK075KKC
112.5 NMK112KKC
150 NMK150KKC
225 NMK225KKC
300 NMK300KKC
500 NMK500KKC
750 NMK750KKC

600 Delta Primary Volts 208Y/120 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015PBCN
30 NMK030PBCN
45 NMK045PBC
75 NMK075PBC
112.5 NMK112PBC
150 NMK150PBC
225 NMK225PBC
300 NMK300PBC
500 NMK500PBC
750 NMK750PBC

600 Delta Primary Volts 240 Delta Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015PDCN
30 NMK030PDC
45 NMK045PDC
75 NMK075PDC
112.5 NMK112PDC
150 NMK150PDC
225 NMK225PDC
300 NMK300PDC
500 NMK500PDC
750 NMK750PDC

600 Delta Primary Volts 480Y/277 Secondary Volts 60 Hz

KVA CATALOG NO.
15 NMK015PKCN
30 NMK030PKC
45 NMK045PKC
75 NMK075PKC
112.5 NMK112PKC
150 NMK150PKC
225 NMK225PKC
300 NMK300PKC
500 NMK500PKC
750 NMK750PKC

 

o     HAMMOND INDUSTRIAL CONTROL TRANSFORMERS

o     HAMMOND  BUCK BOOST TRANSFORMERS

o     HAMMOND   LINE REACTOR TRANSFORMERS

o     HAMMOND DRIVE ISOLATION TRANSFORMERS

o     HAMMOND MOTOR STARTING AUTO TRANSFORMERS

o     HAMMOND LOW VOLTAGE LIGHTING TRANSFORMERS

o     HAMMOND GENERAL PURPOSE DISTRIBUTION TRANSFORMERS

o     HAMMOND K-FACTOR TRANSFORMERS

o     HAMMOND ENCAPSULATED TRANSFORMERS

o     HAMMOND  AUTOTRANSFORMERS

o     HAMMOND GENERAL PURPOSE MEDIUM VOLTAGE TRANSFORMERS

 

Power Transformer Information:

Power Transformer HomeContact Power Transformer Co.


Power Transformer Types

Step Up and Step Down Transformers Step Up and Step Down Transformers to Power transformers to step-up ( raise) or step-down (lower) the electrical voltage.
 
Isolation Transformers Isolation Transformers allows signal or power to be taken from one device and fed into another without electrically connecting the two.
 
Toroidal Transformers Toroidal Transformers are devices that transfer electrical energy from one electric circuit to another, without changing the frequency, by electromagnetic induction.
 
Custom Transformers
 
Custom Transformers are designed to meet certain performance specifications and size requirement that you require. There is a wide range of custom transformer types.
 
Buck Boost Transformers
 
Buck Boost Transformers is a ideal solution for changing line voltage by small amounts. Often used to buck (lower), or boost (raise) the voltage from 208v to 240v for lighting applications.
 
Pole Mounted Transformers
 
Pole Mounted Transformers are mounted to poles for overhead electrical lines. Used in various applications. Are available in single phase or three phase transformers.
 
Medium Voltage Transformers
 
Medium Voltage Transformers are used with a medium range of voltages. They come in a full range from liquid-filled, convention dry type as well as cast coil.
 
Pad Mounted Transformers Pad Mounted Transformers are a excellent choice for commercial and industrial such as manufacturing facilities, refineries, office buildings, schools, hospitals, restaurants, and retail stores. They come in various sizes and can be used underground as well.
 
High Voltage Transformers High Voltage Transformers typically these voltage transformers are used in power transmission applications. High voltage transformers are also used in microwave.
 

 Power Transformer Manufacturer

  • ACME Transformers - With Acme Electric being in business over 80 years, they have always believed in offering there customers superior service, quality and technical expertise in the transformer market.
  • AMVECO Transformers - AMVECO designs and manufactures toroids transformers, current transformers, and auto transformers. Most AMVECO products are custom designed utilizing their state-of-art proprietary CAD programs.  The AMVECO engineers can quickly generate designs in a matter of hours, if needed.
  • Federal Pacific TransformersFederal Pacific is a division of Electro- Mechanical Corporation, a privately held, American owned company founded in 1958. Federal pacific offers dry-type transformers from .050 KVA through 10,000 KVA single and three phase, up to 34.5 KV, 150 KV BIL with UL approval through 15 KV.
  • Marcus Transformer - Ever since they opened their doors for business a half a century ago, they have been a leader in innovative transformer design. As a family-owned company they are proud of the reputation they have earned for making quality-built transformers that deliver exceptional performance and savings.
  • Hammond TransformersHammond Manufacturing was founded in 1917 in Guelph, Ontario, Canada. In the last 3 decades it has expanded to the US and the international markets offering many types of power transformers. 
  • TEMCo Transformers - TEMCo Transformer, a family-owned business which has been manufacturing and distributing electrical products since 1968. They focus on transformers that significantly reduce power consumption over 30 percent compared to competitive makes.
  • GE Transformers - GE has been a key player in the energy industry for more than a century.  Since the installation of their first steam turbine in 1901. They have become number one provider of high-technology power generation and distribution equipment.
  • Jefferson Electric Transformers - Jefferson Electric has been a pioneer and innovator of magnetic products since 1915. Jefferson broad line of dry-type transformers are backed by quality assurance systems so stringent that each and every unit gets thoroughly tested before it goes out there door.
  • More power transformer brands - Check out more companies by clinking this link.

 Power Transformer Types

  • Distribution Transformers - Distribution transformers are generally used in electrical power distribution and transmission power. This class of transformer has the highest power, or volt-ampere ratings. and the highest continuous  voltage rating.
  • Substation Transformers - Substation Transformers are large devices which usually weigh tens of thousands of pounds.   They are filled with tens of thousands of gallons of heat transfer fluid.  Although they are typically 99.8% efficient in the transforming of electricity from one voltage to another, processing hundreds of Mega Volts-Amps of electricity force the liberation of hundreds of BTUs per second.
  • Medical Grade Isolation
     Transformer -
    Medical Grade Transformers generally refer to the transformers used in medical devices as well as hospital, biomedical and patient care equipment. There are a number of strict safety rules, guidelines and laws governing the design, construction and the test of these transformers.
  • Drive Isolation Transformer - They are used to isolate a drive from a main power line to prevent the transmission of harmonics that the drives produce back into the power line.  They stop drive harmonics from disrupting computers and other sensitive equipment.
  • Toroidal Transformers - Toroidal Transformers are more efficient than the cheaper laminated EI types of similar power level. Some of the advantages are smaller size, lower weight, less mechanical hum, (making them superior in audio amplifier), low-off-load loss.
Capacitor for Motor Resources

 Power Transformer Types

  • Step-Up Transformers - A Step-Up Transformer is one whose secondary voltage is greater than its primary voltage.  This kind of transformer "steps up" the voltage applied to it. -
  • Step-Down Transformers - A Step-Down Transformer is  designed to reduce voltage from primary to secondary.  They can range from sizes from .05 KVA to 500 KVA
  • Isolation Transformers - An Isolation Transformer is a device that transfers energy from the alternating current (AC) supply to an electrical or electronic load.  It isolates the windings to prevent transmitting certain types of harmonics.
  • Buck Boost Transformers - Buck Boost Transformers make small adjustments to the incoming voltage. They are often used to change voltage from 208v to 240v for lighting applications.  Major advantages of Buck boost transformers include; low cost, compact size and light weight. 
  • High Voltage Transformer - There are many different types of voltage transformers. A High Voltage Transformer operates with high voltages. Typically, these voltage transformers are used in power transmission applications, where voltages are high enough to present a safety hazard.
  • Medium Voltage Transformers - A Medium Voltage Transformer can be connected directly to a primary distribution circuit and generally has the most load diversity. These voltage transformers have installation practices that are generally in accordance with application recommendations from the Institute of Electrical and Electronic Engineers (IEEE).
  • Low Voltage Transformers - A Low Voltage Transformer is an electrical device that transforms 120 volts (line voltage) into 12 volts or 24 volts (low voltage). Some uses for low voltage transformer are in landscaping lighting.
  • Single Phase Transformers - In electrical engineering, single-phase electric power refers to the distribution of electric power using a system in which all the voltages of the supply vary in unison. Single-phase distribution is used when loads are mostly lighting and heating, with few large electric motors.
  • Three Phase Transformers - Three Phase Transformers must have 3 coils or windings connected in the proper sequence in order to match the incoming power and therefore transform the power company voltage to the level of voltage needed while maintaining the proper phasing or polarity.
  • Custom Transformers - Custom Transformers are designed for a certain performance specifications and size requirements.  The company works with your engineering specification. 
  • Industrial Control Transformers - Industrial Control Transformers are used to convert the available supply voltage to the required voltage to supply industrial control circuits and motor control loads.
  • Pad Mounted Transformers - Pad Mounted Transformers are usually single phase, or three phase, and used where safety is a main concern. Typical applications; restaurant, commercial building, shopping mall, institutional. 
  • Pole Mounted Transformers - Pole Mounted Transformers are used for distribution in areas with overhead primary lines. Outside a typical house one can see one of these devices mounted on the top of an electrical pole.
  • Oil Filled Transformers - Oil Filled Transformers are transformers that use insulating oil as insulating materials.  The oil helps cool the transformer. Because it also provides part of the electrical insulation between internal live parts, transformer oil must remain stable at high temperatures over an extended period.
  • Dry Type Transformers - Dry-Type Transformers are available for voltages up through 34.5 kV (although the most common upper limit is 15) and KVA ratings up through 10,000 (with 5000 as the usual limit). Dry-type use air as a coolant, lowering health and environmentally concerns.
  • Auto Transformers - An Autotransformer is an electrical transformer with only one winding. The winding has at least three electrical connection points called taps. Autotransformers are frequently used in power applications to interconnect systems operating at different voltage classes, for example 138 kV to 66 kV for transmission. Another application is in industry to adapt machinery built for 480 V supplies to operate on the local 600 V supply.
  • More power transformer types - Read further about additional transformer types and their uses.

 Power Transformer Term Definitions

  • Electrical Transformers - Electrical Transformers are devices used to raise or lower the voltage of alternating current. For instance, power is transported over long distance in high voltage power lines and then transformers lower the voltage so that the power can be used by a business or household.
  • Isolating Transformers - An Isolating Transformer is a transformer, often with symmetrical windings, which is used to decouple two circuits.  An Isolation transformer allows an AC signal or power to be taken from one device and fed into another without electrically connecting the two circuits. Isolation transformers block transmission of DC signals from one circuit to the other, but allow AC signals to pass. 
  • Transmission Power Lines - A Transmission Line is the material medium or structure that forms all or part of a path from one place to another for directing the transmission of energy, such as electromagnetic or acoustic waves as well as electric power transmission. Components of transmission lines include wires, coaxial cables,  dielectric slabs, option fibers, electric power lines, and waveguides.
  • Transformer Voltage - The measure of the amount of force on a unit charge because of the surrounding charge.
  • Transformer Phase - Most transformer are either single phase or three phase.
  • Transformer Frequency - The transformer cannot change the frequency of the supply. If the supply is 60 hertz, the output will also be 60 hertz.
  • Transformer K Factor - Some transformers are now being offered with a k-factor rating. This measure the transformer's ability to withstand the heating effects of non-sinusoidal harmonic currents produced by much of today's electronic equipment and certain electrical equipment.
  • Primary Voltage - The coil winding that is directly connected to the input power.
  • Secondary Voltage - The coil winding  supplying the output voltage.
  • Harmonic Cancellation - Harmonic cancellation is performed with harmonic canceling transformers also known as phase-shifting transformers. A harmonic canceling transformer is a relatively new power quality product for mitigating harmonic problems in electrical distribution systems. This type of transformer has patented built-in electromagnetic technology designed to remove high neutral current and the most harmful harmonics from the 3rd through 21st.
  • Weatherproof - Enclosed transformers come with a weatherproof standard set by NEMA.
  • Epoxy Encapsulated - A process in which a transformer or one of its components is completely sealed with epoxy or a similar material. This process is normally preferred when a unit might encounter harsh environmental conditions.
  • More power transformer terms - Such as inductor, ground fault, core saturation, current transformer, faraday shield, etc.


Related Transformer Products

  • Voltage Regulators - A Voltage Regulator is an electrical regulator designed to automatically maintain a constant voltage level.  It may use an electromechanical mechanism, or passive or active electronic components. Depending on the design, it may be used to regulate one or more AC or DC voltages.
  • AC Line Reactor - AC Line Reactors is a three phase transformer used in conjunction with AC variable frequency and DC motor drive. They are a bi-directional protective filtering device.
  • Line Power Conditioners - Power or Line Conditioners regulate, filter, and suppress noise in AC power for sensitive computer and other solid state equipment.
  • DC Power Supplies - Conversion of one form of electrical power to another desired form and voltage. This typically involves converting 120 or 240 volt AC supplied by a utility company to a well-regulated lower voltage DC for electronic devices.
  • Rotary Phase Converters - Rotary Phase Converters are commonly used in home or small commercial or industrial settings. Rotary phase converters convert single-phase power into three-phase power. This is a very cost-effective way to power three-phase electric motors and other three phase equipment.
  • Frequency Converters - A Frequency Changer or Frequency Converter is an electronic device that converts alternating current (AC) of one frequency to alternating current of another frequency.
  • Voltage Converters - A Voltage Converter changes the voltage of an electrical power source and is usually combined with other components to create a power supply.
  • Magnetic Motor Starters - Magnetic Motor Starters are essentially heavy duty relays mounted in boxes, often equipped with heater/thermal overloads matched to the motor they start.
  • Motor Starting Auto Transformers - An Auto Transformer starter uses an auto transformer to reduce the voltage applied to a motor during start. The auto transformer may have a number of output taps and be set-up to provide a single stage starter, or a multistage starter.

For an additional resource the Best of Industry Web Directory : Electrical Power Transformer Directory section is quite useful.