Emerson TRE Ex e Transformers Instruction Manual
Contents
1. 3 5 6 25 2 25 3 5 2 3 5 2A Waste des ah ie 25 inane 8 1 6 sD S25 oo 75 125 200 5 8 So 2 8 4 5 2 5 4 5 2 5 4 2 5 4 Dea MW 22s 1252 1 1252 1 1 8 1 1 5 Glee 250 36 3 5 6 25 3 5 6 3 2 5 6 3 2 5 3 5 Bis MSs eBay las 125225 Taa 125 2 300 4 6 25 45 7 5 47 A 6 25 3 5 6 25 3 5 6 25 3 2 5 2 3 2 1823 183 1 6 2 5 1 5 2 5 1 5 2 5 390 4 5 7 5 8 5 8 4 5 7 5 4 5 7 5 4 7 SON Zoe 2 20 8 0 2 25 3 0 en o o 1 8 3 1 8 3 1 75 2 5 500 6 25 10 4 6 25 4 6 3 5 5 6 3 5 5 3 5 5 9 3 2 5 6 3 2 5 3 5 2 5 4 5 2 5 4 2 5 4 750 10 15 6 25 Q 6 9 5 6 8 5 8 5 7 5 8 12 5 8 4 5 8 4 5 7 5 4 6 25 3 5 6 25 3 5 6 25 1000 12 20 8 12 8 12 7 5 10 7 10 6 25 10 10 17 5 3 5 5 6 3 6 5 3 5 5 9 5 8 5 8 1500 17 5 80 12 15 12 15 10 15 1015 1065 15 25 5 6 8 5 8 5 7 5 4 5 6 25 4 5 6 25 4 5 6 25 2000 25 40 15 5 15 20 15 20 12 20 12 20 20 85 7 5 10 7 10 6 25 10 6 9 5 6 8 5 8 3000 35 60 20 35 20 35 17 5 80 17 5 80 20 80 35 50 10 15 10 15 10 15 9 12 8 12 8 12 5000 60 100 35 60 30 60 30 50 30 50 30 50 60 90 1525 15125 15125 12 20 12 20 12 20 7500 80 150 50 90 45 90 45 80 45 80 40 70 90 125 25 40 25 40 20 85 20 80 10K 110 200 70 125 60 110 60 1102. 60 110 60 100 110 175 30 50 30 50 30 50 25 45 15K 175 300 100 175 90 175 90 150 90 150 80 150 175 250 45 80 45 80 40 70 35 60 25K 300 500 175 300 150 800 150 250 150 250 150 250 90 250 60 70 70 125 70 125 1 60110 37K 200 350 100 175 80 150 50K 300 500 150 250 110 200 75K 400 750 200 350 175 300 100K 600 1000 300 500 225 400 167K 900 1600 450 850 350 650 Recommended fuse sizes per UL 508 and NEC 450 3 B NEC 430 72 and commercially available type fuses 198 Fuse I times 300 next size smaller if primary current is less than 2 amp No secondary fusing required Fuse 1 500 next size smaller if used for a motor control circuit per NEC 430 72 C 4 Fuse I times 167 next size smaller if primary current is less than 9 amp No secondary fusing required Fuse I times 250 next size smaller if primary current is less than 9 Amps Secondary fusing is required see chart for size Fuse I times 125 next size higher if primary current is 9 amp or higher No secondary fusing required Fuse I times 250 next size smaller if primary current is 9 Amps or higher Secondary fusing is required see chart for size Contact Technical Services at 800 377 4384 with any questions Visit our website at www solahd com SOLA HD Transformers 5 Primary Overcurrent Protection A transformer has all the same com
3. Fuse 50 a2 O9 0 6 0 6 0 3 0 3 0 3 75 5 1 125 1 1 05 0 5 Oo 100 6 25 1 5 1 4 1 25 OS 0 6 0 6 150 10 2 29 2 2 1 13 1 200 12 3 2 8 2 5 1 5 1 4 1 25 250 15 Si 30 3 2 1 8 1 8 1 6 300 20 4 5 4 4 2 25 2 2 350 20 5 5 4 5 25 AO 2 25 500 30 ras T 6 25 g5 39 3 2 750 40 10 10 10 5 6 5 5 1000 12 12 12 7 7 6 25 1500 175 178 176 10 10 10 2000 25 25 25 12 12 12 3000 35 35 So Iro 175 iro 5000 60 60 60 30 30 30 7500 90 90 80 45 45 40 10K 125 110 110 60 60 60 15K 1m Vis WS 90 90 80 25K 300 300 300 150 10 150 37 5K 400 200 50K 600 300 75K 800 400 100K 1200 600 167K 1800 900 Fuse times 167 next size smaller if secondary current is less than 9 amp Fuse times 125 next size smaller if secondary current is 9 amp or higher Contact Technical Services at 800 377 4384 with any questions 199 Visit our website at www solahd com 5 Ventilated Distribution Transformers SOLAtHD Distribution Transformers manufactured after January 1 2007 must meet specific energy efficiency requirements U S Department of Energy defines the term distribution transformers as any transformer which e Has an input voltage of 34 5 kVA or less e Has an output voltage of 600 V or less e s rated for operation at a frequency of 60 Hz e Has a capacity of 10 kVA to 2500 kVA for liquid immersed units and 15 kVA to 2500 kVA for dry type units The following special purpose transformers are excluded from the definition of distribution tr
4. SOLAt HD Transformers 5 Overcurrent Protection Fusing and circuit breaker protection How to overcurrent protect 600 Volt class transformers and associated wiring per NEC 450 3 B NEC 240 3 and NEC 240 6 A 1 Primary protection only is required if the transformer is single phase and the secondary has only two wires Overcurrent protection rating and location are shown in Diagram A Transformer lie ransformer Supply Voltage Overcurrent gt a Protector Primary Current Overcurrent Protection Rating Less than 2 amps 300 maximum 2 to 9 amps 167 maximum 125 of rated primary current or 9 amps or more next highest standard rating Diagram A 2 If the branch circuit feeding the transformer has overcurrent protection to meet the individual protection requirements in Example 1 then individual transformer protection is not required Individual transformer overcurrent protection NOT REQUIRED Transformer ae Supply Voltage Branch Circuit feeding transformer meets this requirement Pri Primary Current Overcurrent Protection Rating Less than 2 amps 300 maximum 2 to 9 amps 167 maximum 125 of rated primary current or 9 amps or more next highest standard rating Diagram B 3 Primary and secondary protection is required if the transformer has more than two wires on the secondary Circuit Individual Transformer Transformer Suppl
5. and multiplying it across all the energy consumed results in substantial savings 75 KVA Transformer Efficiency a eet ek nee 9r 96 95 94 93 de ole ole l Ka ms A SO Non Compliant TP1 Efficiency ale ole ale ale oO P P P F Percent Load Figure 1 SolaHD offers the following family of transformers that meet the strict efficiency standards The efficiencies of these transformers are optimized for the load losses calculated at 35 of the name plate rating This 385 represents an industry average load of most LVGP transformers Applications Any situation where the available voltage must be changed to accommodate the voltage required by the specific electrical circuit or connected equipment For many electrical circuits the National Electrical Code NEC requires a separately derived neutral secondary connection provided by Delta Wye connected transformers Distribution transformers can be located close to the load No vaults are required for installation and no long expensive feeder lines are needed Common applications include inductive and resistive loads such as motors lighting and heating General Purpose Transformers Transformers designed to meet the high energy efficiencies required by NEMA Standard TP 1 Low Temperature Rise Transformers Transformers designed to limit the temperature rise of the core and coil assembly to either 80 C or 115 C above a 40 C ambient Reduction in temp
6. ansformers and are therefore not required to meet the energy efficiency standards at this time e Autotransformers e Drive isolation transformers e Grounding transformers e Machine tool control transformers e Non ventilated transformers e Rectifier and Regulating transformers e Sealed transformers e Special impedance transformers e Testing transformers e Transformer with tap range of 20 or more e Uninterruptible power supply transformers e Welding transformers Benefiting from Higher Energy Efficiencies Increasing the energy efficiency of a transformer allows the unit to operate at the same level of power with less energy being wasted in the process Decreasing usage through reduced waste by just 03 over the next 20 years cuts the need for new power generation in the United States by 60 to 66 million kw SolaHD has been engineering and producing energy efficient transformers for over a decade years The SolaHD energy efficient transformers are optimized to meet NEMA s TP 1 limits for load losses calculated to 35 of the name plate rating yet are the same compact size and footprint as its conventional 150 C rise units The example pictured in Figure 1 shows the differences in efficiency for the old standard model compared to the compliant model At 35 load the absolute difference in efficiency is only 1 7 However that represents a 52 reduction in wasted energy Taking that 52 reduction in wasted energy
7. e must define what full capacity means on one phase of a three phase transformer A three phase transformer built by SolaHD in a ventilated enclosure standard construction on 15 kVA and above has a per phase capacity equal to 1 3 of the nameplate rating Therefore the tapped phase of a ETSHS30S has a total capacity of 10 KVA 1 3 of 30 kVA The 120 volt tap is at the center of this 240 volt winding so the capacity is 5 KVA on either side of the tap X1 to X6 and X3 to X6 To determine the available capacity of the center tap you must know the three phase load applied to the 240 delta Each phase will supply 1 3 of the kVA to the three phase load If the ET5H30 has a 21 kVA 3 phase load connected to it each phase is loaded at 7 kVA Therefore the tapped phase has 3 kVA available 10 KVA 7 KVA 3 kVA The center tap can be loaded to 3 kVA without over loading the transformer but the load must be split so that no more than 1 5 kVA 1 2 the available capacity is connected to either side of the tap X1 to X6 and X3 to X6 The general formula is Transformer kVA 30 Load kVA kVA of each GO Center Tap Circuit a fy gh i 7 if LAN rF i i if Sy ff Sy aoe k k _ FF 4 2 Ai A 4 J r 4 if BF Note All 480 delta to 240 delta transformers stocked by SolaHD are equipped with a center tap Secondary Fuse Recommendations Secondary Voltage Va 24 110 115 120 220 230 240 VA Secondary Time Delay Dual Element Slow Blow
8. erature rise increases reliability K Factor Transformers Transformers designed to withstand the electrical anomalies associated with solid state equipment and DC power supplies excluding SCR variable speed motor drives without derating the nameplate kVA Copper Wound Transformers SolaHD general purpose transformers have standard aluminum coil windings As an option we offer a selection with copper windings 200 Contact Technical Services at 800 377 4384 with any questions Visit our website at www solahd com
9. ponent parts as a motor and like a motor exhibits an inrush when energized This inrush current is dependent upon where in the sine wave the transformer was last turned off in relation to the point of the sinewave you are when you energize the transformer Although transformer inrush could run up to 30 to 35 times full load current under no load it typically is the same as a motor about 6 to 8 times normal running current For this reason It Is important to use a dual element slow blow type fuse the same type of fuse you would use with a motor If using a circuit breaker select a breaker with a time delay again the same type you would use with a motor If the time delay is not sufficient you may experience nuisance tripping a condition where the breaker trios when energizing the transformer but it functions properly after it is re started Secondary Overcurrent Protection Overcurrent devices are used between the output terminals of the transformer and the load for three reasons 1 Protect the transformer from load electrical anomalies 2 Since short circuit current is minimized a smaller gauge wire may be used between the transformer and the load 3 Per NEC a larger primary fuse may be used to reduce nuisance tripping Capacity of Center Tap in Center Tap Delta Transformers This is one of the most common transformer application questions If the transformer is a SolaHD T5H series the tap is full capacity but w
10. y Voltage Primary a Overcurrent ercurrent Protector Pri Lia Primary Secondary Overcurrent Current Current Protection Rating 250 primary current Less than 9 amps 167 maximum 125 or next higher standard rating Not more than 250 9 amps or more 4 lf the branch circuit feeding the transformer has overcurrent protection to meet the individual primary overcurrent protection requirements in Example 3 then individual primary protection is not required Secondary OCP is required as shown below Individual transformer overcurrent protection NOT REQUIRED eco Overcurrent Supply Voltage Branch Circuit feeding the transformer meets these requirements Overcurrent Protection Rating Primary Current Secondary Current Diagram C 250 primary current Less than 9 amps 167 maximum 3 Not more than 250 9 amps or more 12o A Or NEX elas standard rating Diagram D Contact Technical Services at 800 377 4384 with any questions 197 Visit our website at www solahd com Transformers SOLA HD Primary Fuse Recommendations Primary Voltage X 120 200 208 220 230 240 211 440 460 480 550 579 600 VA 50 T25 2 I roni 25 e MTSE e TTS 6 1 6 1 D8 3 D 3 5 3 5 25 4 25 4 25 4 75 OS ILa des 1 1 6 81 6 8 1 5 8 1 25 5 8 A 8 A 75 4 6 3 6 3 6 100 DS Ay Nes 2Sy 1422511 251225 12512 252 aes eais 6 1 6 1 5 8 5 8 5 8 150
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