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Three-Phase-Voltage-Drop-and-Fault-Current-Calculator---Electric-West

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Three-Phase-Voltage-Drop-and-Fault-Current-Calculator---Electric-West Powered By Docstoc
					Three Phase Voltage Drop and Short Circuit Calculator
Transformer K= 12.9 CU or 21.2 AL Length L-L Volts kVA %Z 21.2 20 480 150 1.3 Cmils Segment 1 Length Segment 1 Motor Amps Panel 1 Resistive Amps Panel 1 Total Amps Segment 1 Voltage at Panel 1 % Voltage Drop from PCC Segment 1 PANEL 1 Total I s.c. sym RMS "C" Value Conductors per phase 13312 18593 1 Total I s.c. sym RMS "C" Value Conductors per phase 3815 18593 1 Total I s.c. sym RMS "C" Value Conductors per phase 250000 1000 8 2 37.5 474.5 1.15% Cmils Segment 2 Length Segment 2 Motor Amps Panel 2 Resistive Amps Panel 2 Total Amps Segment 2 Voltage at Panel 2 % Voltage Drop from PCC Segment 2 PANEL 2 1631 18593 1 Total I s.c. sym RMS "C" Value Conductors per phase 250000 2000 11.5 0 27.5 466.4 2.83% Cmils Segment 3 Length Segment 3 Motor Amps Panel 3 Resistive Amps Panel 3 Total Amps Segment 3 Voltage at Panel 3 % Voltage Drop from PCC Segment 3 PANEL 3 923 18593 1 Total I s.c. sym RMS "C" Value Conductors per phase 250000 3000 8 0 16 459.4 4.30% Cmils Segment 4 Length Segment 4 Motor Amps Panel 4 Resistive Amps Panel 4 Total Amps Segment 4 Voltage at Panel 4 % Voltage Drop from PCC segment 4 PANEL 4 701 18593 1 250000 2500 8 0 8 456.4 4.91% Power Drop

Point of Common Coupling (PCC)

CALCULATION REFERENCE AREA 3 Phase FLA Multiplier I s.c. at Transformer "f" M I s.c. sym RMS Total Motor Amps I s.c Motor Contribution 1.732 180 76.92 13879 0.0539 0.9489 13170 36 142

Available I s.c. "f" M I s.c. sym RMS Total Motor Amps I s.c Motor Contribution

13170 2.5855 0.2789 3673 36 142

Available I s.c. "f" M I s.c. sym RMS Total Motor Amps I s.c Motor Contribution

3673 1.4672 0.4053 1489 36 142

Available I s.c. "f" M I s.c. sym RMS Total Motor Amps I s.c Motor Contribution

1489 0.9057 0.5247 781 36 142

Available I s.c. "f" M I s.c. sym RMS Total Motor Amps I s.c Motor Contribution

781 0.3986 0.7150 559 36 142

Electric West Inc. 1417 Energy St. PO Box 939 Gillette, WY 82717-0939 (307) 686-6466 Office (307) 682-6615 Fax Designed by Lorn MacIlravie Comments or corrections are welcome! This calculator is based on the information in Ugly's Electrical References. You can find information on the wire sizes and the "C" value in the Ugly's Electrical References, or in publications from Cooper Bussmann. lorn@vcn.com


				
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Description: Three-Phase-Voltage-Drop-and-Fault-Current-Calculator---Electric-West