42 Dongan ® Electric Manufacturing Company Three Phase - Specialty Applications Three Phase iSOLATED Banks of 2 or 3 Single Phase Transformers Single phase, stock, general purpose transformers may be banked to achieve a variety of three phase volt- age combinations. These combinations are achieved by connecting two or three identical 240/480 volt, or 600 volt primary, single phase transformers into three phase banks. When connected per the diagrams, these banks provide isolation between primary and secondary just as a three phase, general purpose transformer would. Typically, banks of three single phase transformers are connected in a Delta Primary and Delta Secondary, or a Delta Primary and Wye Secondary configuration. The capacity of the three unit, three phase bank is equal to the sum of the individual single phase kVA ratings. For example, three single phase 10 kVA transformers connected in this manner will have a capacity of 3 x 10 kVA - or 30 kVA, three phase. Conversely, two transformer banks are connected al- most solely in an Open Delta configuration. The capac- ity of the 2 unit, three phase bank is equal to the sum of the individual single phase kVA ratings multiplied by 86.6% (.866). For example, two single phase 10 kVA transformers connected in this manner will have a ca- pacity of 2 x 10 kVA x .866 - or 17.3 kVA, three phase. The configurations shown represent some of the more popular combinations. Please consult the factory to obtain information on any configuration not shown in the charts below. O indicates Overcurrent Protection 240 ∆, 208Y/120, 3 Phase - 3 Unit Bank 480 ∆, 208Y/120, 3 Phase - 3 Unit Bank 240 ∆, 240 ∆, 3 Phase - 3 Unit Bank 600 ∆, 208Y/120, 3 Phase - 3 Unit Bank 600 ∆, 240 ∆, 3 Phase - 3 Unit Bank 600 ∆, 240 ∆, 3 Phase - 2 Unit Bank 480 ∆, 240 ∆, 3 Phase - 2 Unit Bank 480 ∆, 240 ∆, 3 Phase - 3 Unit Bank 415Y/240, 240 ∆, 3 Phase - 3 Unit Bank
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42 Dongan® Electric Manufacturing Company
Three Phase - Specialty Applications
Three Phase iSOLATED Banks of 2 or 3 Single Phase TransformersSingle phase, stock, general purpose transformers may be banked to achieve a variety of three phase volt-age combinations. These combinations are achieved by connecting two or three identical 240/480 volt, or 600 volt primary, single phase transformers into three phase banks. When connected per the diagrams, these banks provide isolation between primary and secondary just as a three phase, general purpose transformer would.Typically, banks of three single phase transformers are connected in a Delta Primary and Delta Secondary, or a Delta Primary and Wye Secondary configuration. The capacity of the three unit, three phase bank is equal to the sum of the individual single phase kVA ratings. For example, three single phase 10 kVA transformers
connected in this manner will have a capacity of 3 x 10 kVA - or 30 kVA, three phase.Conversely, two transformer banks are connected al-most solely in an Open Delta configuration. The capac-ity of the 2 unit, three phase bank is equal to the sum of the individual single phase kVA ratings multiplied by 86.6% (.866). For example, two single phase 10 kVA transformers connected in this manner will have a ca-pacity of 2 x 10 kVA x .866 - or 17.3 kVA, three phase.The configurations shown represent some of the more popular combinations. Please consult the factory to obtain information on any configuration not shown in the charts below.
O indicates Overcurrent Protection
240 ∆, 208Y/120, 3 Phase - 3 Unit Bank480 ∆, 208Y/120, 3 Phase - 3 Unit Bank 240 ∆, 240 ∆, 3 Phase - 3 Unit Bank
600 ∆, 208Y/120, 3 Phase - 3 Unit Bank 600 ∆, 240 ∆, 3 Phase - 3 Unit Bank 600 ∆, 240 ∆, 3 Phase - 2 Unit Bank
480 ∆, 240 ∆, 3 Phase - 2 Unit Bank480 ∆, 240 ∆, 3 Phase - 3 Unit Bank 415Y/240, 240 ∆, 3 Phase - 3 Unit Bank
431.800.428.2626 • www.dongan.com
Dimensions & weights may change. Consult factory for certified drawings.
Three Phase Open Delta Autotransformer ConnectionsSingle phase, general purpose transformers may be used to achieve a wide variety of nonstandard voltage combinations. These combinations are achieved by connecting two identical, 240/480 volt primary, 120 x 240 volt secondary, single phase transformers into three phase, autotransformer banks - much like the buck-boost configurations featured on pages 48 - 66 later in this catalog.The configurations shown represent some of the more
popular combinations. Many other combinations are available. Please consult the factory to obtain infor-mation on any configuration not shown in the charts below.Dongan® will provide easy to read connection dia-grams at your request. Contact Dongan® Customer Service at the number below and request the appropri-ate diagram # from chart for your application.
Connection diagrams furnished upon request. Please consult the factory, or your Dongan® Representative, to obtain the correct diagram for your specific application.
Dimensional information may be found in the single phase section of this catalog. Please be sure to order two (2) single phase units for the three phase applications listed on this page. Untapped versions, indicated by an asterisk (*), may have output voltages
varying by approximately 5% higher or lower than indicated.
Series 3PTT Three Phase Auto Testing Transformers allow three phase line voltages to be transformed into various three phase voltages found around the world. Manufacturers, motor rewinders, machinery builders, and automation suppliers will find these versatile autotransformers particularly useful in test-ing motors and other loads at their rated voltage.
Voltages include 208, 220, 240, 380, 440, 480, 550, and 600 volts three phase. All taps are designed to carry full load current at rated voltage. All 3PTT Series transformers are copper wound. All units incorporate a 200°C insulation system and a 115°C rise for significant overload capacity.
Series ODY Autotransformers offer a fast, economi-cal, factory pre-connected installation for transform-ing three phase lines from 208 to 240, or from 240 to 208. Simply bring in three wires on the line side and
Series ODY - Factory Pre-Connected Autotransformers
Series 3PTT
take out three wires on the load side. Series ODY offer an economical method of bucking and boost-ing 208 and 240 volt lines where the presence of a fourth wire neutral is not needed.
Series 3PTT, 25 - 100 kVAFloor Mount - Ventilated - NEMA Type 3R
Series 3PTT, 5 - 15 kVAWall Mount - Ventilated - NEMA Type 3R
Series ODYWall Mount - Ventilated - NEMA Type 3R
Wiring Diagram - 3PTT
Wiring Diagram - ODY
Dimensions & weights may change. Consult factory for certified drawings.
General information Winding Specifications Dimensions
ZiG-ZAG Connected AutotransformersFor developing a neutral from a three phase, 3-wire supplyThree, single phase isolation transformers may be connected into a three phase “zig-zag” bank to ob-tain 277 volts by creating a neutral from an existing 480 volt, three phase, three wire service. This neu-tral can be grounded, allowing a ground fault on any phase to trip the overcurrent protection. The zig-zag connection stabilizes the neutral point so that 277 volts will be maintained between each phase and neutral under unbalanced load conditions, and also accurately reflects any ground fault condition back to the supply overcurrent protection.The bank’s connections require three identical single phase transformers, each having a 240 x
480 volt primary and a 120 / 240 volt secondary.The chart below indicates kVA and ampere ratings for zig-zag banks of three transformers each. For example, when three 5 kVA transformers are con-nected per the connection diagram below, the resul-tant bank provides 17.3 kVA per phase, or 51.9 kVA for the bank. In this example, 17.3 kVA equals the maximum continuous load per phase at 277 volts.In addition to providing a solution utilizing off-the-shelf transformers, the zig-zag bank is extremely economical when compared to a conventional three phase isolation transformer of similar capacity.
Three Phase - Specialty Applications
(O indicates Overcurrent Protection)
.5 kVA to 5 kVAWall Mount - Encapsulated - NEMA Type 3R
7.5 kVAWall Mount - Encapsulated - NEMA Type 3R
10 kVA to 100 kVAFloor Mount - Ventilated - NEMA Type 3R
Connection diagrams furnished upon request. Please consult the factory, or your Dongan® Representative, to obtain the correct diagram for your specific application.
Dimensional information may be found in the single phase section of this catalog. Please be sure to order three (3) single phase units for the three phase applications listed on this page.
General information Winding Specifications Dimensions