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 Heavy Duty E0603PB 0.060kva Control Transformer fused US $29.99 
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 Jefferson Electric Dry-Type Transformer 10 KVA 1 Phase 240/480V P. - 120/240V S. US $300.00
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 KVA45 TRANSFORMER 3 PHASE ISO US $500.00
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 General Electric Dry Type Transformer 10 KVA 1 Phase 240/480V P. - 120/240V S. US $225.00
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 GE Transformer 3 KVA Type QB US $125.00
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 General Electric Dry Type Transformer KVA .250 US $115.00
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 ARDEE LIGHTING / USA GENERAL PURPOSE TRANSFORMER TW-500 PH1 kVA .50 US $99.99
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 Hevi-Duty Transformer .150 KVA D44513 S10 US $12.99
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 WESTINGHOUSE 1000 KVA 3 PHASE 60 HZ TYPE OA TRANSFORMER 4160 HV 408Y / 277 LOW V US $7,399.00
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 GE 9T21A4008 3PH Transformer 504/492/480/468/456VAC to 208/120VAC 6kVA US $350.00
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 ITE 15 KVA TRANSFORMER PRI 480V SEC 208Y/120 3 PH DRY TYPE 3F3Y015-1B US $250.00
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 FPT Transformer .75 kVA 240 x 480 120/240 V .75kVA 3R US $95.00
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 Square D Transformer 9070 EO-1 9070EO-1 .05kva .05 KVA US $12.00
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 (TR4-D) Hevi-Duty Transformer 0.5 KVA Cat.# HS19F500B US $30.00
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 (TR4-D) Jefferson Electric Powerformer 2 KVA Transformer 211-091 US $35.00
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 (TR4-D) Federal Pacific Transformer SE2N1F 1 KVA 60Hz E121540 US $30.00
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 225kva Siemens Transformer HV 480 3ɸ / LV 208 3F3Y225RTP1 US $1,595.00
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 (TR4-D) Westinghouse 0.25 KVA Transformer Type EPTransfoermer S20N11S26N US $30.00
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 (TR3-E) Hevi-Duty Type HS 0.15 KVA Transformer HS1A150 US $25.00
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 37.5 KVA 240/480 X 120/240, 1 Phase Transformer US $450.00
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 Siemens 150 KVA 480 X120/208, K13 Transformer - T316 US $2,400.00
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 Cutler-Hammer Industrial Control Transformer CE1500K2ACEFS 1.5-KVA 1500/8915 US $299.00
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 750kva transformer 600v-480v/277v 600 480 277 wye volt 3 phase EE750T126H 460v US $9,400.00
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 SOLA .25 KVA 23-22-125 Transformer (TRA1172) US $150.00
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 GE 25 KVA 9T21B9110 1 Phase Transformer (TRA2107) US $450.00
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 NEW GE 5 KVA 9T21B1007G2 1 Phase Transformer (TRA2112) US $260.00
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 GE 10 KVA 9T21B1009 1 Phase Transformer (TRA2115) US $270.00
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 Siemens 2300 Volt to 115 Volt Control Transformer Part# 25-213-133-001 KVA 0.75 US $100.00
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 NEW SQUARE D 5 KVA TRANSFORMER 5S40F US $490.00
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 Magnetek 216-1141 Transformer 0.75 KVA 1PH 120/240 12/24 US $50.00
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 MARCUS WM 5 KVA MS5H9 SINGLE PHASE TRANSFORMER SPEC 7819 US $199.99
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 EGS / SOLA E750 .750 kVa INDUSTRIAL CONTROL TRANSFORMER US $70.11
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 SQUARE D 9070 TYPE EO-61 .500/.750 KVA TRANSFORMER US $125.00
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 ALLEN BRADLEY X-257917 1 PHASE TRANSFORMER 500VA PRI 600V SEC 120V 0.5KVA 45966 US $44.99
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 Square D Transformer 9070 TF150D24 0.150KVA US $40.00
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 Square D Transformer 9070 K500D32 0.5KVA US $200.00
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 GE .050KVA 230/460/575 X 115/95, 1 Phase Transformer - T595 US $30.00
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 Magnetek 216-1131 Transformer 0.500KVA 1PH 120/240 12/24 US $40.00
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 GE .150 KVA 120/240 X 12/24 Buck Boost Transformer - T494 US $75.00
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 SQUARE D 2S1F GENERAL PURPOSE DRY TRANSFORMER 2KVA 1PH RAINPROOF ENCLOSURE #237 US $229.00
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 Acme Transformer 1 PHASE .750 KVA T253009S 240/480 S US $120.00
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 General Electric Dry Type Transformer Type QL 9T23Q1126 30 KVA 3 PH 480/575Y-332 US $995.00
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 2000 KVA PAD MOUNT TRANSFORMER 7620/13200GRDY 277/480Y US $20,000.00
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 SQUARE D 1.5S1F GENERAL PURPOSE TRANSFORMER 1.5KVA 1PH RAINPROOF ENCLOSURE #237 US $259.00
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 Square D Sorgel 10 KVA Transformer 480-460 Delta Delta three 3 phase US $178.00
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 HS1F1A Sola Hevi-Duty 1.0 kva 1 ph transformer 240/480v US $80.00
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 Square D 150T3H 150 kva dry type electrical Transformer 150kva 480 - 208y/120 US $1,800.00
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 Square D Transformer 1500/2000 KVA, USED, 1 year Warranty US $14,000.00
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 SYLVANIA ZINSCO 25KVA TRANSFORMER US $449.00
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 set of 5 Jefferson transformers 5KVA 120/240--120/240 US $650.00
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 NEW GENERAL SIGNAL E5503PB .550 KVA TRANSFORMER US $48.60
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 ALLEN BRADLEY TRANSFORMER X-3438585 .075KVA US $20.00
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 NEW GENERAL SIGNAL E5503PBX .550 KVA TRANSFORMER US $48.60
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 FUJI 23 KVA DRY-TYPE SELF-COOLED TRANSFORMER US $337.50
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 General Electric Transformer Dry Type QMS3 9T21J9702 7.50 KVA 3 Ph 460/460Y-266 US $185.25
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 TR13 Square D 0.05 KVA Transformer 230-460/115 Volt Class 9070 Type E0-1 SeriesA US $25.00
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 SQUARE D 5S67F TRANSFORMER DRY 1PH 5KVA ***XLNT*** US $599.00
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 GE 9T51Y12 2KVA 120 240 480V VOLT DRY TRANSFORMER US $125.00
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 500 kva Square D Transformer HV 480 3ɸ / LV 208y/120 500T68H US $3,495.00
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 GE 9T51B0124 .1KVA 16 32 120 240V VOLT TRANSFORMER US $50.00
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 ACME T-1-81051 .500KVA 12 24 120 240 TRANSFORMER US $55.00
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 Acme Transformer T-1-81050 .25 KVA 1 phase 120 x 240 US $29.99
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 CONTROL TRANSFORMER 517C53 1.5KVA 60Hz 1PH US $89.99
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 Allen Bradley Control Transformer X-211467 Primary 600 V/Secondary 120 V .350KVA US $50.00
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 MGM HT112A3K2SH 112.5 kva dry type electrical Transformer 112.5kva 480 - 240/120 US $1,475.00
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 HITRAN ISO Transformer AC0495 Class AA 1Ph 110 KVA NEW US $550.00
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 SIEMENS 4AM3841-8BD40-0C TRANSFORMER CONTROL CIRCUIT 49 KVA US $179.99
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 HEVI-DUTY ELECTRICAL TRANSFORMER HT5F6AS 3 PH 6 kva 6.0KVA 6.0 KVA 480 V DELTA US $300.00
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 ACME T-2A-53315-3 112.5 kva dry type electrical Transformer 112.5kva 480-208/120 US $1,195.00
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 Square D General Purpose Transformer 150SV1A 1PH .15KVA US $19.95
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 EGS HEVI-DUTY 3 PHASE 30 KVA TRANSFORMER T-11 US $339.99
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 Hammond mfg KC45 45 kva dry type electrical Transformer 45kva 600v - 208v US $600.00
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 Square D 45KVA TRANSFORMER US $600.00
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 Challenger 30KVA Transformer US $600.00
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 GE 5 KVA 9T21B1013 1 Phase Transformer (TRA2116) US $245.00
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 GE 5 KVA 9T21B1037 1 Phase Transformer (TRA2117) US $245.00
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 GE 5 KVA 9T21B1013G2 1 Phase Transformer (TRA2119) US $245.00
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 GE 7.5 KVA 9T21B1014G2 1 Phase Transformer (TRA2121) US $275.00
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 Jefferson Electric Dry-Type Transformer 7.5 KVA 1 Phase US $250.00
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 GS Hevi Duty Dry Type Transformer 9 KVA 3 Phase 432/456/480V P. - 208Y/120V S. US $495.00
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 Square D Three Phase Insulated 45 KVA Transformer 45T76H 480/277 Volt 54 Amp US $1,500.00
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 Challenger drive Isolation TRANSFORMER 40 KVA #3BN LQ3 US $675.00
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 Transformer GE 225 KVA 480/240 Dry Type US $2,000.00
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 GENERAL SIGNAL .500KVA 1PHASE TRANSFORMER HS1F500A NEW US $55.00
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Kva Transformer
3000 KVA transformer start up
High Voltage vs. Low Voltage Transformers by MikeD
Category: Transformers
If your company is planning to invest in a power transformer, it is best to get as well acquainted with these devices as possible, before you ask for quotes and go about buying one. A transformer is a complex and vital component of power transmission and once installed, its life could span anywhere from two to three decades. It is therefore important to make a wise and knowledge-based choice.
There are a few basic things about transformers that you must know. The first is the voltage aspect. There are broadly three voltage ratings in which transformers are available, high voltage, medium voltage, and low voltage. Below is a brief that should help you understand each of them better.
High voltage transformers
The high voltage transformer deals with voltages that cannot be used directly by the consumer, but are used in power transmission applications. High voltage transformers usually handle electrical energy in the range of 230,000 to 35,000 volts. Due to the particular demands of transmitting these voltages across long distances, a highvoltage transformer has considerably different core geometry, winding methods, and insulation methods than low voltage transformers.
High voltage transformers that have the capacity to increase the primary voltage to transmission-level high voltage are called step-up transformers. Conversely, highvoltage transformers can also be used to step-down voltages, depending on where they are in the transmission chain. Some of the applications of high voltage transformers are in electrical isolation, instrumentation and power distribution and control. This type of transformer can also be easily configured from single phase to three phase.
Medium voltage transformers
Transformers in this range are typically deployed in the local distribution sector of the power delivery system. They range from 35,000 volts to 2,400 volts and are used to deliver power from local distribution circuits to end users. Where residential customers are the end user, the output voltage can be as low as 120 volts, or for industrial customers, it can be 5,000 volts. This transformer can be viewed as a link from the end user to the utility provider.
These transformers are most often seen mounted on utility poles or as green boxes with tamperproof enclosures for connections located in shopping malls, residential subdivisions, schools and mobile home parks, in newer residential developments they can even be seen along sitting curb-side in front of the users home. These are usually liquid filled and are by far the most numerous of the three sizes.
Low voltage transformers
A lowvoltage transformer, also sometimes called a magnetic lowvoltage transformer, is typically used at the consumer end of the energy grid. A lowvoltage transformer is a distribution transformer with both the primary and secondary windings designed to operate at system voltages in the low voltage classes. Typically, electronic lowvoltage transformers convert 120 volts into 12 volts or 24 volts. A DC low voltage transformer uses a rectifier to convert its output to direct current (DC) and to lessen radio frequency interference (RFI). Lowvoltage transformers offer a variety of mounting configurations and are often small in size.
So unless your company is a huge steel plant, has a huge furnace, or runs machinery for the mining or petrochemical industry, in all probability your company will have to invest in a medium or low voltage transformer. The exact rating (expressed in terms of kVA), of course, will depend on your energy requirement.
Whatever your eventual requirement, it is important that you consider vendors that can provide customized, environmentally friendly units that conform strictly to DOE standards.
To know more about Transformers check out Pacific Crest Transformers website.
http://www.pacificcresttrans.com/home.html
Article Source: http://www.earticlesonline.com/Article/High-Voltage-vs--Low-Voltage-Transformers/687575
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Frequently Asked Questions...
how do work out amperes for 5 kva transformer.?
Answer:
Single phase or 3 phase?
Single, take 5,000and divide it by the output voltage.
3 phase, multiply that by the square root of 3, 1.732.
and the power factor, say .95
