6 Buck Boost Transformers
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1 6 uck oost Transformers uck-oost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. uck-boost transformers are in compliance with NEC rticle 210.9, Exception 1 when field connected as an autotransformer. The major advantages of uck-boost transformers are their low cost, compact size and light weight. They are also more efficient and cost less than equivalent isolation transformers. When connected as an autotransformer, they can handle loads up to 20 times the nameplate rating. buck-boost transformer is the ideal solution for changing line voltage by small amounts. When a buck-boost has the primary and secondary windings connected, per recommended instructions, it becomes an autotransformer. Now, only the secondary windings are transforming voltage and current. The majority of the kv load passes directly from the supply to the load. This is the reason buck-boost transformers can supply a load with a much larger kv rating than the nameplate indicates. Low voltage lighting control applications SolaHD buck-boost transformers are designed to supply power to low voltage lighting circuits, control panels or other systems requiring 12, 16, 24, 32, or 48 Volts. When connected as an insulating transformer (by following the wiring diagram located after the specification tables on the inside of the transformer case), the transformer s capacity matches the nameplate kv rating. SolaHD buck-boost transformers are also suited for low voltage landscape lighting. They are UL Listed for outdoor service and their compact size makes them the perfect solution for providing power to accent lighting applications. Electrical diagrams are shown at the end of this section. Use dimmers on the output of the transformer that are designed and rated for use with magnetic loads. We strongly recommend contacting the dimmer manufacturer for advice on your specific lighting application. Certifications and Compliances Listed - UL CS C22.2 No. 66 ccessories Surge Protective Devices ctive Tracking ilters Selection Steps 1. Line easure the supply voltage with a voltmeter. 2. equired for the Load Check the load equipment to determine the voltage requirement. 3. kv or mpere ating of the Load ind either the load kv or the load amperage requirements. This information is listed on the nameplate of the load equipment. E requency Either 50 or 60 Hz. The frequency of the transformer must match the frequency of the load. 5. Number of Phases Single or three phase line and load must match. ( transformer cannot convert single to three phase.) common application is to make a single phase connection from a three phase supply by using one phase of the three phase supply circuit. e careful not to overload that phase of the three phase supply. or buck-boost applications the supply must provide load kv not just the nameplate rating of the buck-boost. efer to the Selection Tables on the following pages. 230
2 uck oost Transformers 6 Three phase, buck-boost applications require two or three transformers. Check the equired column of the Three Phase Selection Tables for the exact quantity. using uck-oost Transformers or determining the correct size of breaker or fuse for a given range of input or output ampere ratings, refer to Section 450.4, of the National Electric Code (NEC). Where an overcurrent protection device is required, the electrical connections and selection tables will reference appropriately. Using the Selection Tables 1. Determine if you are trying to oost (raise) or uck (lower) your voltage. Select an input/output voltage combination that comes closest to matching your application from the appropriate single or three phase charts on the following pages. 2. ove across your selected input/output voltage row to the amperage or kv rating closest to, but greater than the rating required by your load. 3. eading the top of the column will give you the catalog number of the exact buck-boost transformer you need. See the Specification Tables on the next page. 4. Connect the transformers according to the diagram indicated. See the Electrical s section at the end of this section. diagrams are packed with each transformer. Overcurrent devices OC-1a and OC-1b are shown correctly installed in accordance with NEC Locating an overcurrent device in series with the shunt winding anywhere between and is not permitted. The shunt winding is the winding common to both the input and the output circuits. 231
3 6 uck oost Transformers Specification Tables Group x 240 Volt Primary, 12/24 Volt Secondary KV aximum Secondary mperage 12 V 24 V Height in (mm) Width in (mm) Non-Encapsulated - 50/60 Hz, Single Phase Depth in (mm) pprox. Ship Weight lbs (kg) 0.05 HS (152.4) 4.00 (101.6) 3.00 (76.2) 2.0 (0.91) HS (152.4) 4.00 (101.6) 3.00 (76.2) 4.0 (1.82) HS (190.5) 4.00 (101.6) 4.00 (101.6) 5.0 (2.27) HS (190.5) 4.00 (101.6) 4.00 (101.6) 8.0 (3.64) 2 1 Encapsulated - 60 Hz, Single Phase 0.5 HS (254.0) 6.00 (152.4) 5.00 (127.0) 22.0 (10.00) HS (254.0) 6.00 (152.4) 5.00 (127.0) 27.0 (12.27) HS (254.0) 6.00 (152.4) 5.00 (127.0) 28.0 (12.73) HS (304.8) (254.0) 7.00 (177.8) 38.0 (17.27) HS (304.8) (254.0) 7.00 (177.8) 45.0 (20.45) HS (304.8) (254.0) 7.00 (177.8) 55.0 (25.00) HS (431.8) (355.6) 9.00 (228.6) (45.45) HS (431.8) (355.6) 9.00 (228.6) (61.36) 4 1 Design Style Elec Conn Group x 240 Volt Primary, 16/32 Volt Secondary KV aximum Secondary mperage 16 V 32 V Height in (mm) Width in (mm) Non-Encapsulated - 50/60 Hz, Single Phase Depth in (mm) pprox. Ship Weight lbs (kg) 0.15 HS (203.2) 4.00 (101.6) 4.00 (101.6) 6.0 (2.73) HS (203.2) 4.00 (101.6) 4.00 (101.6) 8.0 (3.64) 2 2 Encapsulated - 60 Hz, Single Phase 0.5 HS (254.0) 6.00 (152.4) 5.00 (127.0) 22.0 (10.00) HS (254.0) 6.00 (152.4) 5.00 (127.0) 27.0 (12.27) HS (254.0) 6.00 (152.4) 5.00 (127.0) 28.0 (12.73) HS (304.8) (254.0) 7.00 (177.8) 38.0 (17.27) HS (304.8) (254.0) 7.00 (177.8) 45.0 (20.45) HS (304.8) (254.0) 7.00 (177.8) 55.0 (25.00) HS (431.8) (355.6) 9.00 (228.6) (45.45) HS (431.8) (355.6) 9.00 (228.6) (61.36) 4 2 Design Style Elec Conn Note: Weights and dimensions may change and should not be used for construction purposes. 232
4 uck oost Transformers 6 Specification Tables continued Group x 480 Volt Primary, 24/48 Volt Secondary KV Catalog Number aximum Secondary mperage 24 V 48 V Height in (mm) Width in (mm) Non-Encapsulated - 50/60 Hz, Single Phase Depth in (mm) pprox. Ship Weight lbs (kg) 0.15 HS (203.2) 4.00 (101.6) 3.00 (76.2) 5.0 (2.27) HS (203.2) 4.00 (101.6) 3.00 (76.2) 8.0 (3.64) 2 3 Encapsulated - 60 Hz, Single Phase 0.5 HS (203.2) 6.00 (152.4) 5.00 (127.0) 22.0 (10.00) HS (254.0) 6.00 (152.4) 5.00 (127.0) 27.0 (12.27) HS (254.0) 6.00 (152.4) 5.00 (127.0) 28.0 (12.73) HS (304.8) (254.0) 7.00 (177.8) 38.0 (17.27) HS (304.8) (254.0) 7.00 (177.8) 45.0 (20.45) HS (304.8) (254.0) 7.00 (177.8) 55.0 (25.00) HS (431.8) (355.6) 9.00 (228.6) (45.45) HS (431.8) (355.6) 9.00 (228.6) (61.36) 4 3 Note: Weights and dimensions may change and should not be used for construction purposes. Design Style Elec Conn Electrical s for Low pplications = Earth Ground Volt Primary, 12/24 Volt Secondary Taps: None Volt Primary, 16/32 Volt Secondary Taps: None Volt Primary, 24/48 Volt Secondary Taps: None Primary Interconnect Connect Lines To 240 to & 120 Secondary to to Interconnect & Connect Lines To 24 to & to to to to HS19 and S19 Series -- & Primary Interconnect Connect Lines To 240 to & 120 Secondary to to Interconnect & Connect Lines To 32 to & to to to to HS20 and S20 Series -- & Primary Interconnect Connect Lines To 480 to & 240 Secondary to to Interconnect & Connect Lines To 48 to & to to to to HS22 and S22 Series -- & 233
5 6 uck oost Transformers Design Styles Custom Design Styles Style 2 - Non-Encapsulated Style 5 - Encapsulated vailable for all encapsulated kv sizes (or Type 4, 12 and 4) Style 3 - Encapsulated Style 4 - Encapsulated 234
6 uck oost Transformers 6 Selection Tables: Single Phase Table 1: Using Group 1 (120 x 240 V Primary, 12/24 V Secondary) Transformers eq d D C D1 218 ** D C1 132 ** ** D2 252 ** C2 264 ** D2 pplication HS1950 HS19100 HS19150 HS19250 HS19500 HS19750 HS191 OOSTING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size UCKING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size * or alternate electrical connection diagrams, refer to the section immediately following the selection tables. ** Shaded items are 60 Hz only (ll other ratings shown are 50/60 Hz). 235
7 6 uck oost Transformers Selection Tables: Single Phase Table 1: Using Group 1 (120 x 240 V Primary, 12/24 V Secondary) Transformers eq d D C D1 218 ** D C1 132 ** ** D2 252 ** C2 264 ** D2 pplication HS191.5 HS192 HS193 HS195 HS197.5 OOSTING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size UCKING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size * or alternate electrical connection diagrams, refer to the section immediately following the selection tables. ** Shaded items are 60 Hz only (ll other ratings shown are 50/60 Hz). 236
8 uck oost Transformers 6 Selection Tables: Single Phase Table 2: Using Group 2 (120 x 240 V Primary, 16/32 V Secondary) Transformers eq d D C D C1 240 ** D1 136 ** ** D2 256 ** C2 272 ** D2 pplication HS20150 HS20250 HS20500 HS20750 HS201 OOSTING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size UCKING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size * or alternate electrical connection diagrams, refer to the section immediately following the selection tables. ** Shaded items are 60 Hz only (ll other ratings shown are 50/60 Hz). 237
9 6 uck oost Transformers Selection Tables: Single Phase Table 2: Using Group 2 (120 x 240 V Primary, 16/32 V Secondary) Transformers eq d D C D C1 240 ** D1 136 ** ** D2 256 ** C2 272 ** D2 pplication HS201.5 HS202 HS203 HS205 HS207.5 OOSTING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size UCKING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size * or alternate electrical connection diagrams, refer to the section immediately following the selection tables. ** Shaded items are 60 Hz only (ll other ratings shown are 50/60 Hz). 238
10 uck oost Transformers 6 Selection Tables: Single Phase Table 3: Using Group 3 (240 x 480 V Primary, 24/48 V Secondary) Transformers eq d ** D C D D1 458 ** C1 277 ** C2 418 ** D2 504 ** C2 528 ** D2 pplication HS22150 HS22250 HS22500 HS22750 HS221 OOSTING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size UCKING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size * or alternate electrical connection diagrams, refer to the section immediately following the selection tables. ** Shaded items are 60 Hz only (ll other ratings shown are 50/60 Hz). 239
11 6 uck oost Transformers Selection Tables: Single Phase Table 3: Using Group 3 (240 x 480 V Primary, 24/48 V Secondary) Transformers eq d ** D C D D1 458 ** C1 277 ** C2 418 * D2 504 ** C2 528 ** D2 pplication HS221.5 HS222 HS223 HS225 HS227.5 OOSTING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size UCKING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size * or alternate electrical connection diagrams, refer to the section immediately following the selection tables. ** Shaded items are 60 Hz only (ll other ratings shown are 50/60 Hz). 240
12 uck oost Transformers 6 Selection Tables: Three Phase Table 4: Using Group 1 (120 x 240 V Primary, 12/24 V Secondary) Transformers eq d E J1 228 ** E L E ** E2 264 ** pplication HS1950 HS19100 HS19150 HS19250 HS19500 HS19750 HS191 OOSTING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size UCKING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size * or alternate electrical connection diagrams, refer to the section immediately following the selection tables. ** Shaded items are 60 Hz only (ll other ratings shown are 50/60 Hz). 241
13 6 uck oost Transformers Selection Tables: Three Phase Table 4: Using Group 1 (120 x 240 V Primary, 12/24 V Secondary) Transformers eq'd pplication HS191.5 HS192 HS193 HS195 HS E J1 228 ** E L E ** E2 264 ** OOSTING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size UCKING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size * or alternate electrical connection diagrams, refer to the section immediately following the selection tables. ** Shaded items are 60 Hz only (ll other ratings shown are 50/60 Hz). 242
14 uck oost Transformers 6 Selection Tables: Three Phase Table 5: Using Group 2 (120 x 240 V Primary, 16/32 V Secondary) Transformers eq'd pplication HS20150 HS20250 HS20500 HS20750 HS E J E L E ** E2 272 ** OOSTING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size UCKING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size * or alternate electrical connection diagrams, refer to the section immediately following the selection tables. ** Shaded items are 60 Hz only (ll other ratings shown are 50/60 Hz). 243
15 6 uck oost Transformers Selection Tables: Three Phase Table 5: Using Group 2 (120 x 240 V Primary, 16/32 V Secondary) Transformers eq'd pplication HS201.5 HS202 HS203 HS205 HS E J E L E ** E2 272 ** OOSTING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size UCKING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size * or alternate electrical connection diagrams, refer to the section immediately following the selection tables. ** Shaded items are 60 Hz only (ll other ratings shown are 50/60 Hz). 244
16 uck oost Transformers 6 Selection Tables: Three Phase Table 6: Using Group 3 (240 x 480 V Primary, 24/48 V Secondary) Transformers eq'd G G E K K E G K K2 504 ** E2 528 ** pplication HS22150 HS22250 HS22500 HS22750 HS221 OOSTING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size UCKING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size * or alternate electrical connection diagrams, refer to the section immediately following the selection tables. ** Shaded items are 60 Hz only (ll other ratings shown are 50/60 Hz). 245
17 6 uck oost Transformers Selection Tables: Three Phase Table 6: Using Group 3 (240 x 480 V Primary, 24/48 V Secondary) Transformers eq'd G G E K K E G K K2 504 ** E2 528 ** pplication HS221.5 HS222 HS223 HS225 HS227.5 OOSTING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size UCKING kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size kv Load mps use Size * or alternate electrical connection diagrams, refer to the section immediately following the selection tables. ** Shaded items are 60 Hz only (ll other ratings shown are 50/60 Hz). 246
18 uck oost Transformers 6 lternate Electrical s for uck-oost pplications Diagram 1 oosting Diagram 1 oosting Diagram C1 oosting Diagram 2 ucking Diagram 2 ucking Diagram C2 ucking The O symbol shown on these connection diagrams indicates where fuses or breakers should be field installed for line to neutral applications. or line to line applications, fuses or breakers should be installed on both lines. pplication Note: On all auto-wye connections, the source neutral must be present and connected to the transformer bank. If source neutral is not present, do not use an auto-wye connection. 247
19 6 uck oost Transformers lternate Electrical s for uck-oost pplications OPEN DELT OPEN DELT Diagram D1 oosting Diagram E1 oosting Diagram 1 oosting OPEN DELT OPEN DELT Diagram D2 ucking Diagram E2 ucking Diagram 2 ucking 248
20 uck oost Transformers 6 lternate Electrical s for uck-oost pplications OPEN DELT OPEN DELT UTO-WYE CONNECTION C Diagram G1 oosting Diagram oosting Diagram J1 oosting OPEN DELT OPEN DELT UTO-WYE CONNECTION C Diagram G2 ucking Diagram ucking Diagram J2 ucking 249
21 6 uck oost Transformers lternate Electrical s for uck-oost pplications UTO-WYE CONNECTION C UTO-WYE CONNECTION C UTO-WYE CONNECTION C Diagram K1 oosting Diagram L1 oosting Diagram 1 oosting UTO-WYE CONNECTION C UTO-WYE CONNECTION C UTO-WYE CONNECTION C Diagram K2 ucking Diagram L2 ucking Diagram 2 ucking 250
22 uck oost Transformers 6 pplication Note pplication Limitations with uck-oost Transformers 1. uck-oost transformer cannot be used to develop a three phase, four wire wye circuit from a three phase, three wire delta circuit. delta to wye connection does not supply enough current carrying capability to provide for unbalanced currents flowing in the neutral wire of the four wire circuit. The neutral created is not stable and under load will not deliver desired line to neutral voltages. This connection would also be in violation of the National Electric Code, rticle uck-oost transformers cannot be used in a closed delta connection. closed delta requires more kv capacity than a wye or an open delta connection, plus phase shifting comes into play on the output side. 3. uck-oost transformers should not be used to correct for voltage drop on a long circuit run where the load fluctuates. drop varies with the load and buck-boost transformers are connected for a specific voltage change. If a buck-boost transformer was used to correct voltage drop during peak loading conditions, high voltages may result under light load conditions. This could be equally detrimental to the load and possibly pose safety hazards. 4. uck-oost transformers cannot be used to create a 240/120 Volt, single phase service from a 208Y/120 Volt three phase supply. Two problems that would occur:. Two neutrals would exist on the same circuit. Since neutrals must be grounded according to the National Electric Code, a short circuit would be created.. Unbalanced line to output neutral voltages would be created; one line would read 120 Volts, the other 130+ Volts. What is a uck-oost transformer and why is it used? Isolation transformers have separate primary and secondary windings, electrically insulated and isolated from one another. With a relatively high voltage primary (typically 120, 240 or 480 Volts) and a relatively low voltage secondary (typically 12, 16, 24, 32 or 48 Volts), buck-boost transformers are designed to be field connected as autotransformers. These are transformers with one continuous winding, a portion of which is jointly shared between the input and the output. No electrical isolation is present in an autotransformer. uck-oost transformers have two major uses: 1. When field connected as an autotransformer, they can be used to uck (lower) or oost (raise) available line voltage in the range of 5 to 27% and at a kv rating many times that listed on the transformer nameplate. 2. When left as an isolation transformer, they can be used to supply power to low voltage circuits at the nameplate rating listed. The importance of altering available line voltage. Electrical equipment is designed to operate at maximum efficiency at a specific standard supply voltage. Your voltage may not be at the standard supply voltage level. Causes can be proximity to a large utility transformer, losses in the line voltage due to loads on that circuit, or a difference between the standard supply voltage available and the standard supply voltage needed to run the equipment. Normally the problem is having low voltage available. Low voltage on a circuit, even as little as 5% lower can cause a decrease in incandescent light output, and a decrease in resistive heat output. With motors low voltage can cause a decrease in motor torque, an increase in motor amperage requirements, an increase in motor temperature and decrease in motor life expectancy. 251
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