This calculator program in C helps the user to enter the Operator (+, -, *, or /) and two values. C Program to Create Simple Calculator Example 1 See attached document 7400HO9501 ' Looking for Low Voltage Transformer Solutions' for more information.How to write a C Program to Create Simple Calculator using Switch case, Functions, and Else If Statement. Following the 208V top margin entry, and reading down vertically, it is seen 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. 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. This is a 'Three Step Division', technique: VA / 1.732 / Voltage = Amperage.Īs an alternative to these calculations, you may prefer to use the charts below. (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 EX75T3H 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 177. 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
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