Down Transformer
Todays deals on Down Transformer?
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Transformer-Step Down 480V to 120/240V Free Shipping!!! $1,850.00 |
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APC AP9626 – Step-Down Rack-mountable Transformer $636.04 |
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8 KVA Toroid Transformer Step Down 240 120 208 88 volt $325.00 |
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3000 Watts Step Up & Down Transformer FREE SHIPPING $448.00 |
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3000 W Step Down & Step Up Transformer FREE SHIPPING $448.00 |
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NEW – APC Symmetra RM 208/120V 5kVA Step Down Transformer SYTF2 $295.00 |
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Acme Industrial Control Transformer Shut Down Box $349.00 |
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Philmore ST5000 5000 Watt 110/220 volt Step Up or Step Down Transformer $269.95 |
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AMAT Rheinland 5kVA 1-Ph Pri:208 Sec:28/120 Transformer TUV 0190-76255 Step-down $299.99 |
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1000 Watts Step Up & Down Transformer FREE SHIPPING $226.00 |
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1000 W Step Down & Step Up Transformer FREE SHIPPING $226.00 |
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New Philmore ST3000 3000 Watt 110/220 volt Step Up or Step Down Transformer $174.95 |
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New Philmore ST3000 3000 Watt 110/220 volt Step Up or Step Down Transformer $154.95 |
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Electrical Step Down Control Transformer $170.00 |
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Sanyo Step down transformer 1500VA model TSD-N15LU , tested, nice $179.00 |
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New Philmore STJ2000 Japanese Use 2000 watt 100/117 Step Up/Down Transformer $144.95 |
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Philmore ST2000 2000 Watt 110/220 volt Step Up or Step Down Transformer $134.95 |
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New Philmore STJ2000 Japanese Use 2000 watt 100/117 Step Up/Down Transformer $129.95 |
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Goldsource THG 5000 W Watt Step Up Down 110V 220V Voltage Converter Transformer $149.99 |
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Philmore ST2000 2000 Watt 110/220 volt Step Up or Step Down Transformer $119.95 |
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5 KVA Step down Auto Transformer, Input 230V Output 110V on Full Load 50/60 Hz $145.99 |
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Eaton Cutler-Hammer 1.5 KVA 1-Ph Step-Down Transformer 3R S20N11S16N $137.99 |
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New Philmore ST1500 1500 watt 110/220 volt Step Up or Step Down Transformer $104.95 |
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Signal Transformer Part #1150-OF Step Down Auto Transformer Electrical $125.00 |
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NEW STANCOR GSD-1500 AUTO TRANSFORMER STEP DOWN $99.99 |
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3000 WATT STEP-UP STEP-DOWN ISOLATION TRANSFORMER 120-240 VOLTS 240-120 VOLTS $89.00 |
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Power Transformer 2000Watt Step up Down 110/220 NEW! $76.95 |
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*NEW*STANCOR * STEP-DOWN AUTO-TRANSFORMER * GSD-750 * IN-230/OUT115@750VA $99.95 |
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500 Watts Step Up & Down Transformer FREE SHIPPING $108.00 |
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500 W Step Up & Step Down Transformer FREE SHIPPING $108.00 |
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VALUEPRO 220VAC/110VAC STEP-DOWN TRANSFORMER $89.95 |
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New Philmore ST1000 1000 watt 110/220 volt Step Up or Step Down Transformer $79.95 |
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STEP UP & DOWN AUTO TRANSFORMER 110v to 220 st-500 $89.70 |
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NEW PHILMORE STEP-UP & DOWN TRANSFORMER ST-500 $99.95 |
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Swallow 1KVA Single Winding/Phase Step-Down Transformer TB-100D $96.99 |
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New Philmore STJ1000 Japanese Use 1000 watt 100/117 Step Up/Down Transformer $84.95 |
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New Philmore ST1000 1000 watt 110/220 volt Step Up or Step Down Transformer $71.95 |
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300 W Step Up & Step Down Transformer FREE SHIPPING $90.00 |
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300 Watts Step Up & Down Transformer FREE SHIPPING $90.00 |
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NEW Signal Transformer 120 – 240 Up or Down Du-1/4 $79.99 |
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Power Transformer 1000Watt Step up Down 110/220 NEW! $56.95 |
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New Philmore STJ1000 Japanese Use 1000 watt 100/117 Step Up/Down Transformer $74.95 |
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POWER BRIGHT STEP UP/STEP DOWN TRANSFORMER POWER SOURCE VC-1000W $59.99 |
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SQ D STEP DOWN CONTROL TRANSFORMER $60.00 |
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RELIAPRO 220VAC/110VAC STEP-DOWN TRANSFORMER $69.95 |
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Goldsource ST 2000 W Watt Step Up Down 110V 220V Voltage Converter Transformer $79.99 |
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Acme Industrial Control Transformer 1000VA 1000 VA TB-83220 Step Down $67.99 |
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Foster 1500VA Transformer 115,127,200,220,240Volt down to 115V FREE SHIPPING $79.00 |
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Foster 1500VA Transformer 115,127,200,220,240V down to 115V FREE SHIPPING $79.00 |
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New Philmore ST750 750 watt 110/220 volt Step Up or Step Down Transformer $64.95 |
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Power Transformer 1500W Step Up & Down 110AC/220AC New! $48.95 |
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New Philmore Japanese Use 500 watt 100/117 volt Step Up or Step Down Transformer $59.95 |
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NEW Goldsource® STU-1000 Step Up/Down Voltage Transformer Converter $68.99 |
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DONGAN 50-0150-053 .150 KVA STEP DOWN TRANSFORMER $60.00 |
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New Philmore ST750 750 watt 110/220 volt Step Up – Step Down Transformer $54.95 |
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NEW Square D 9070EO2D1 9070E02D1 industrial control transformer step down xfmr $64.99 |
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New Philmore ST500 500 watt 110/220 volt Step Up or Step Down Transformer $49.95 |
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New Philmore Japanese Use 500 watt 100/117 volt Step Up or Step Down Transformer $48.95 |
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DONGAN 50-0150-053 KVA STEP DOWN TRANSFORMER USED $55.00 |
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Goldsource THG 1500 W Watt Step Up Down 110V 220V Voltage Converter Transformer $59.99 |
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Vaco Voltampere Mil-Spec Step Down Transformer Inductor Part # TF4TX07YY 169100 $54.95 |
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Philmore ST500 500 watt 110/220 volt Step Up or Step Down Transformer. NIB $48.90 |
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Conair – TS301TR Travel Smart TS301TR Step Down Transformer $57.55 |
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New Philmore ST500 500 watt 110/220 volt Step Up or Step Down Transformer $44.95 |
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Goldsource THG 1000 W Watt Step Up Down 110V 220V Voltage Converter Transformer $54.99 |
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New Philmore ST-300 300 watt 110/220 Volt Step Up or Step Down Transformer $39.95 |
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New Philmore Japanese Use 300 watt 100/117 volt Step Up or Step Down Transformer $39.95 |
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500 W WATTS STEP UP/DOWN VOLTAGE CONVERTER TRANSFORMER $44.99 |
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Goldsource ST 1000 W Watt Step Up Down 110V 220V Voltage Converter Transformer $49.99 |
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New Philmore Japanese Use 300 watt 100/117 volt Step Up or Step Down Transformer $34.95 |
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Philmore ST-200 Step Up & Down Power Transformer $35.00 |
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500 WATTS STEP UP/DOWN VOLTAGE CONVERTER TRANSFORMER $44.99 |
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Goldsource STU 750 W Watt Step Up Down 110V 220V Voltage Converter Transformer $41.99 |
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New Philmore ST-300 300 watt 110/220 Volt Step Up or Step Down Transformer $29.95 |
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FOUR (4x) Step-Down Low Voltage 16V ac 4A 64W Transformer, need more than 12VAC? $24.00 |
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300 WATTS STEP UP/DOWN VOLTAGE CONVERTER TRANSFORMER $39.99 |
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300 W WATTS STEP UP/DOWN VOLTAGE CONVERTER TRANSFORMER $34.99 |
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Goldsource ST 750 W Watt Step Up Down 110V 220V Voltage Converter Transformer $39.99 |
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TMS TransFAB H347 EXS113572 347V to 120V 75VA lighting step down transformer $24.00 |
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New Philmore ST100 100 watt 110/220 Step Up or Step Down Transformer $26.95 |
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Trisonic 200 Watt 110V-220V Step-Up & Step-Down Transformer $24.99 |
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PHilmore ST-100 Heavy Duty 100 Watt Step Up Step Down Transformer Converter $24.00 |
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DONGAN 50-0150-053 .150 KVA STEP DOWN TRANSFORMER $29.00 |
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Goldsource STU 500 W Watt Step Up Down 110V 220V Voltage Converter Transformer $36.99 |
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Stancor GSD-150 Step Down Auto Transformer $24.95 |
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Power Transformer 300 Watts Step up/ Down 110-220AC New $20.95 |
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Power Bright VC100W Voltage Transformer 100 Watt Step Up/Down 110 Volt -220 Volt $34.99 |
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200 W WATTS STEP UP/DOWN VOLTAGE CONVERTER TRANSFORMER $29.99 |
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200 WATTS STEP UP/DOWN VOLTAGE CONVERTER TRANSFORMER $34.99 |
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New Philmore ST100 100 watt 110/220 Step Up or Step Down Transformer $21.95 |
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12-40V Step Down to 12V 240W Power Converter Voltage Transformer Auto-recovery $33.57 |
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Power Transformer 300W Step Down 220V-110V New ! $18.95 |
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8V-40V to 12V 6A Max 72W DC-DC Step Down Converter Voltage Transformer F Vehicle $32.29 |
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100 W WATTS STEP UP/DOWN VOLTAGE CONVERTER TRANSFORMER $24.99 |
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Goldsource STU 300 W Watt Step Up Down 110V 220V Voltage Converter Transformer $29.99 |
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TRANSFORMER Honeywell STEP DOWN 100V-200V-24VA NEW $9.99 |
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100 WATTS STEP UP/DOWN VOLTAGE CONVERTER TRANSFORMER $23.99 |
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LED DC12V 40 Watt Step-Down Transformer $24.95 |
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Conair – TS253AD – Travel Smart Step Down Transformer – Transformers – 2GB1695 $28.95 |
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Goldsource ST 300 W Watt Step Up Down 110V 220V Voltage Converter Transformer $27.99 |
Down Transformer Questions
Dry Type and Liquid-Filled Transformers: A Quick Comparison
Transformers under load generate heat due to winding (copper) and core losses occurring during operation. There is an ‘acceptable’ temperature rise for transformers used in power applications, and this can even limit their size. This acceptable temperature rise is directly related to the limitations of the transformer materials; safety regulations; or component parts in close proximity that may have high-temperature reliability problems.
High temperatures can damage the winding insulation; the heat generated from core and winding losses must thus be dissipated. This dissipation can be achieved with a combination of radiation and convection from the exposed surfaces of the transformer. Dry type power transformers up to several hundred kVA can usually be cooled by convection or even by fans. Power transformers can also be immersed in coolant liquids – which can range from mineral oils to silicone-based oils or ester-based vegetable oils. .
Based on the type of cooling used, transformers are thus classified into ‘dry type’ and ‘liquid-filled’.
Liquid-Filled Transformers
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Oil-filled Transformers
Oil-filled transformers primarily use mineral-based oil and cellulose paper (Kraft or Aramid) in their insulation systems. This proven combination exhibits outstanding thermal and dielectric properties at a relatively low cost. So popular and effective are these units, that all other transformer designs are judged in relation to them. They are still unparalleled in terms of purchase cost, among all the options available. The inherent weakness of a mineral oil-filled transformer, of course, is flammability; which is why oil-filled transformers are usually restricted to outdoor installations, or indoor installations that have elaborate means of fire protection.Typical Applications:
Oil-filled transformers, thanks to their lower purchase costs, find applications in literally every sort of power distribution. Of late, the awareness of the fire risks associated with mineral oil-filled transformers has created a movement towards safer alternatives that use non-flammable, biodegradable liquids, or even dry-type transformers. -
Non-Flammable Liquid-Filled Transformers
Polychlorinated biphenyl (PCBs) were produced in large quantities starting as early as the 1930s, in response to the electrical industry’s need for a less flammable substitute for mineral oil as a cooling/insulating fluid for transformers. Several industrial incidents, however, brought the toxicity of PCBs to the fore. As confirmed organic pollutants, PCBs were banned by the late 1970s. A number of alternatives have since surfaced – major ones being silicone, perchloroethylene, high temperature hydrocarbons, and mixtures of oil with perchloroethylene. The first high molecular-weight hydrocarbon-based fluid (HMWH), was introduced in 1975. This fluids possesses similar dielectric properties as mineral oil, provide remarkable levels of fire-resistance, and do not have undesirable environmental fallouts.Typical Applications:
Non-flammable liquid-filled transformers can be installed indoors and outdoors, close to buildings, walkways and rooftops. Usually, no additional infrastructure is required to address issues like fire safety.
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Biodegradable Fluid Liquid-Filled Transformers
Animal fats and vegetable oils offer substitutes that are significantly less harmful to the environment than petroleum oils. However, vegetable oils were not used in transformers for a long time; a fluid which could be stable in the transformer environment and available in the required quantities was simply not available.Transformer manufacturers have since worked on transformer designs that utilize vegetable oil-based dielectric fluids. Comparable in size and electrical performance to conventional liquid-filled units, these transformers are filled with the less flammable dielectric fluids mentioned above. The immediate advantages of biodegradable fluids are clear: higher fire and flash points, thus reducing flammability concerns. The other, and perhaps more long-term advantage, is the fluid’s biodegradability: it has demonstrated high environmental assimilation (over 95% in less than a month) – and it has the virtue of coming from a toxin-free resource.
Typical Applications:
Biodegradable fluid liquid-filled transformers find application in wind turbines, and other indoor and outdoor areas of heightened environmental and safety sensitivity.
Dry Type Transformers
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Vacuum Pressure Impregnated (VPI) Conventional Dry Types
Dry type transformer construction uses high-temperature insulation that exceeds the ratings of cellulose or ‘O’ and ‘K’ class fluids. Modern conventional dry type transformers feature insulation systems comprising carefully coordinated high-temperature (220′C) materials coated with a high-temperature, moisture-resistant polyester sealant. On better quality premium units, the polyester sealant is typically applied with a vacuum pressure impregnation (VPI) process. Units built in this fashion have exhibited high resistance to most chemical contaminants. Dry type transformers are generally rated up to 30MVA; performance under overload is demonstrably limited, but the addition of cooling fans can usually help augment this.Typical Applications:
Dry type transformers have been used effectively in diverse commercial and industrial environments for decades; at ratings exceeding 15 kVA. Appropriately designed and installed, VPI units can even be an exceptionally economical choice in medium voltage distribution (15 kVA, 10 MVA ratings), even with the inclusion of installation costs. Because of reduced fire risks, these transformers have been used successfully in special applications where the public are in close proximity, such as underground tunnels, residential apartments, oil rigs and more. -
Gas-Filled Dry Types
Gas-filled dry type transformers are designed for applications where low flammability is a vital consideration. N2, C2F6, and SF6 gases are the ones used in these designs, providing a dielectric medium that is external to the windings. Apart from being the dielectric medium, these gases also act as the thermal medium to transfer heat from windings to tank walls. Gas-filled transformers are an alternative to dry-type construction with fewer fire and contamination risks.Typical Applications:
Gas media have somewhat limited thermal capabilities; and gas-filled dry type transformers usually do not exceed 3750 kVA (C2F6) or even 2000 kVA (N2). Their design also makes them considerably larger than oil-filled units – anywhere from 20% to 30% bigger. Properly designed and installed gas-filled transformers can operate in any environment and remain truly non-flammable. They are commonly installed in dry-docks to provide local power for shipbuilding. Dry-docks (including transformers) are eventually flooded to float the ship away from the construction site. -
Vacuum Pressure Encapsulated (VPE) Dry Types
Military shipboard use is an exacting requirement, and VPE dry type transformers were developed to meet these needs. VPE transformers are similar to VPI transformers, but employ a resin made of silicone instead of polyester. The VPE method includes several dip processes to encapsulate the coil assembly; the coatings are then cured in an oven. The resin coating in the VPE design is also typically thicker, sometimes by as much as a factor of four; as can be expected, the thermal classification of the insulation system is markedly different for the military than for commercial applications. VPE transformers are more resistant to harsh and wet environments than VPI type counterparts.Typical Applications:
VPE dry type transformers typically find applications in very harsh indoor and outdoor environments. VPE technology allows the transformer to be highly resistant to humid and caustic environments, but carefully designed enclosures are still a must. -
Epoxy Coated Dry Types
Epoxy coated, or ‘epoxy shielded’ dry type units offer the benefits of better environmental protection, minimal noise, high basic impulse levels and better short circuit strength than cast coil types. Epoxy shielded transformers are also usually less expensive, flexible, smaller and lighter. There are typically two variants of epoxy coated transformers – in one, a VPI dry-type is given an overcoat of epoxy varnish; in the other, the epoxy varnish is used as a complete replacement for the polyester sealant.Typical Applications:
Epoxy coated transformers can be ideally suited for environments that may be polluted with acids, alkalis and chlorides. They are also resistant to the effects of salt water and high humidity, thus finding numerous applications in areas which concentrations of these problems.
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RESIBLOC Epoxy Cast Dry Types
Unlike conventional VPI dry type designs, RESIBLOC Epoxy Cast dry type transformers do not use insulation papers in the windings. Instead, pure epoxy resin reinforced with glass fiber rovings are wound directly with the wire. Winding processes controlled by advanced electronics also ensure even distribution and high levels of precision. Aluminum/copper foils are used for the low voltage winding; and circular (or rectangular) copper conductors with glass-fiber reinforced epoxy resin insulation are used for the high voltage windings. The completed winding block is then ‘cured’ in a specially designed oven under rotation. This process enables cast winding production without molds or vacuum. As in most cast epoxy units, the dielectric material on the interior winding is the epoxy itself. RESIBLOC transformers are reliable, environmentally safe, offer extreme fire resistance, have high short circuit withstands, and can be exposed to extreme conditions with minimal maintenance.Typical Applications:
RESIBLOC? transformers often find applications in energization, ovens, or traction; they are commonly found in the railways, marine propulsion and distribution, in the nuclear energy and windmill power sectors, and in the mining industry.
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Epoxy Cast Dry Types
The primary and secondary coils in epoxy cast dry type transformers are usually wound with copper conductors, pre-heated and placed in a mold which will then be filled with de-gassed and mixed epoxy under vacuum. The molds are then cured in special ovens to allow sound, void-free casting. The result is a winding design that is void-free, hermetically sealed, and with a smooth exterior finish.Typical Applications:
Epoxy cast dry type transformers are used inside buildings and tunnels, on ships, offshore platforms and cranes, food-processing plants, and more. They are often combined with primary and secondary switchgear and distribution boards, to form compact substations.
About the Author
Pacific Crest Transformers is a leader in the design and construction of distribution transformer. Read about liquid filled transformers and other information on transformers at PCT’s transformer resource section.
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