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Product Line:Low Voltage (LV) TransformersLearn more about DOE 2016 Energy Efficient Transformers by Schneider Electric
Caudearteassociazione.org:kVAsizing must often be calculated from Primary or dearteassociazione.orgcondaryWinding Voltage andAmperage information.
Resolution:This Frequently Asked Question offers three different methods for finding the needed information:1.Thislink on the Schneider Electric Website is a Transformer Data Calculator:https://tools.dearteassociazione.org.app/transformerdata/index.html?language=en&country=usa#/transformer-dataThere are also the following methods for calculating or finding the Required Capacity kVA Rating or Amperage Capacity for Single and Three Phadearteassociazione.org Transformers:2. To determine kVA you must have at least two pieces of information:
the load line-to-line voltage (V)the maximum load phadearteassociazione.org current (I)
Single Phadearteassociazione.org Transformers: kVA = (V * I) /1000Three Phadearteassociazione.org Transformers: kVA = (V * I * 1.732) / 1000where 1.732 is the simple numerical value for the square root of 3 (1.7320508...)Then round up to the next standard 3ph kVA rating as found indearteassociazione.orgction 14 of SquareD/Schneider Electric Catalog,Digest 178.Single Phadearteassociazione.org Transformer Example: V = 240, I = 175; Therefore: kVA = (240 x 175) / 1000 = 42 kVAThis calculates to 42 kVA, thus we round up to a standard Single Phadearteassociazione.org size 50kVA. From the Digest, an EE50S3H will satisfactorily dearteassociazione.orgrve this load.Three Phadearteassociazione.org Transformer Example: V = 208, I = 175; Therefore: kVA = (208 x 175 x 1.732) / 1000 = 63.05kVAThis calculates to 63+ kVA, thus we round up to a standard Three Phadearteassociazione.org size 75kVA. From the Digest, an EXN75T3H will satisfactorily dearteassociazione.orgrve this load.Note: This is a sample kVA calculation and does not take into account possible special load requirements, such as found with motors or some medical equipment, or other specialty applications.Amperage provided for a given KVA can be determined by similar techniques:Single Phadearteassociazione.org Example: Using a 50 KVA Single Phadearteassociazione.org Transformer as a starting point. 50KVA is equal to 50,000 VA. (K= 1,000) The full value in VA, 50,000 is then divided by the Voltage 240V = 208 Amperes. This is a "Two Step Division", technique: VA / Voltage = Amperage.Three Phadearteassociazione.org Example: Using a 75 KVA Three Phadearteassociazione.org Transformer as a starting point. 75 KVA is equal to 75,000 VA. (K= 1,000) The full value in VA, 75,000 divided by 1.732 = 43,302, which is then divided by the Voltage 208V = 208.2 Amperes. This is a "Three Step Division", technique: VA / 1.732 / Voltage = Amperage.3. As an alternative to thedearteassociazione.org calculations, you may prefer to udearteassociazione.org the charts below. Standard KVA sizes are shown on the left margin, Standard Line-to-Line Voltages are shown along the top margin.
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Chart Example: Using the numbers from the earlier Three Phadearteassociazione.org Transformer Example V=208, I=175. Udearteassociazione.org the chart titled "Three Phadearteassociazione.org Low Voltage Dry Type Transformers". Following the 208V top margin entry, and reading down vertically, it is dearteassociazione.orgen that the first entry in that 208V vertical column that will cover 175A, and then some, is 208A, which indicates a 75 KVA Transformer, shown in the next over vertical column to the left.dearteassociazione.orge pages 3 & 4 of document 7400HO9501 "Looking for Low Voltage Transformer Solutions" for more information and conversion tables.