![]() ![]() Use the chart titled "Three Phase Low Voltage Dry Type Transformers". Standard KVA sizes are shown on the left margin, Standard Line-to-Line Voltages are shown along the top margin.Ĭhart Example: Using the numbers from the earlier Three Phase Transformer Example V=208, I=175. As an alternative to these calculations, you may prefer to use the charts below. This is a "Three Step Division", technique: VA / 1.732 / Voltage = Amperage.ģ. ![]() (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. Three Phase Example: Using a 75 KVA Three Phase Transformer as a starting point. This is a "Two Step Division", technique: VA / Voltage = Amperage. (K= 1,000) The full value in VA, 50,000 is then divided by the Voltage 240V = 208 Amperes. Single Phase Example: Using a 50 KVA Single Phase Transformer as a starting point. 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.Īmperage provided for a given KVA can be determined by similar techniques: From the Digest, an EXN75T3H will satisfactorily serve this load. This calculates to 63+ kVA, thus we round up to a standard Three Phase size 75kVA. From the Digest, an EE50S3H will satisfactorily serve this load. This calculates to 42 kVA, thus we round up to a standard Single Phase size 50kVA. Single Phase Transformer Example: V = 240, I = 175 Therefore: kVA = (240 x 175) / 1000 = 42 kVA Then round up to the next standard 3ph kVA rating as found in Section 14 of SquareD/Schneider Electric Catalog, Digest 178. Where 1.732 is the simple numerical value for the square root of 3 (1.7320508.) Three Phase Transformers: kVA = (V * I * 1.732) / 1000 Single Phase Transformers: kVA = (V * I) /1000 To determine kVA you must have at least two pieces of information: There are also the following methods for calculating or finding the Required Capacity kVA Rating or Amperage Capacity for Single and Three Phase Transformers:Ģ. This link on the Schneider Electric Website is a Transformer Data Calculator: Conversion chartĪdditionally, here is a chart showing the conversion of various power ratings at different electrical phases, considering a 0.8 power factor and a system voltage of 120V.This Frequently Asked Question offers three different methods for finding the needed information:ġ. Simply input the details, such as the kW rating and system voltage for DC connections, and consider the power factor rating for single and three-phase electrical systems. \Īside from these manual calculations, you can use an online calculator to easily determine the amp rating of a specific unit. Suppose you want to use a 10-kW unit in a 220v system, the calculation will go like this: To know how many amps is 10kW in DC connection, you need to consider the voltage rating of the system. For DC connections: Amps = (1000 x kW) / Volt Let’s explore the formulas and steps for each type: 1. The conversion and calculation process for converting 10 kilowatts (kW) to Amperes (Amps) depends on the type of electrical system: DC, AC single-phase, or three-phase. For AC single phase: Amps = 1000 x kW / (PF x Volt)Ĭonversion Formula and Calculation Process Conversion Formula and Calculation Process. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |