Att6f_Innercanyon_Single-Phase_Transformer_Short_Circuit.pdf
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- Solicitation number
- 140P2022R0100
About this file
This document provides short circuit current calculations for single-phase transformers to be used in the potable water supply system at Grand Canyon National Park. Transformer specifications are given for eight models ranging from 25 to 167 KVA, including secondary voltages of 120/240V and percent impedances from 1.6 to 1.8%. Full load and short circuit current values are provided for the transformer windings and associated secondary cable runs of 1/0 aluminum from 25 to 50 feet in length with 4 to 9 parallel runs. The calculations assume an unlimited primary short-circuit current from an infinite bus.
The related federal contract opportunity is solicitation number 140P2022R0100 to replace the Transcanyon waterline and improve potable water systems at Grand Canyon National Park for the Department of the Interior National Park Service National Office.
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Text version
Transformer TX885912 TX885914 TX885916 TX885919 TX885921 TX885923 TX885924 TX885926
Transformer KVA 50 75 25 25 50 25 167 75
Secondary Voltage (LG) 120 120 120 120 120 120 120 120
Secondary Voltage (LL) 240 240 240 240 240 240 240 240
% Impedance 1.6 1.6 1.6 1.6 1.6 1.6 1.8 1.6
FLA (Full Load Amps) 208 313 104 104 208 104 696 313
ISC - Transformer (Amps Short Circuit LL) 13,021 19,531 6,510 6,510 13,021 6,510 38,657 19,531
ISC - Transformer (Amps Short Circuit LG) 19,531 29,297 9,766 9,766 19,531 9,766 57,986 29,297
Secondary Cable 1/0 AL 1/0 AL 1/0 AL 1/0 AL 1/0 AL 1/0 AL 750 AL 1/0 AL
Length of Secondary (ft) 50 50 50 50 50 50 25 20
Number of Parallel Runs of Secondary 4 4 4 4 4 4 9 4
ISC - Secondary (Amps Short Circuit LL) 10,566 14,484 5,833 5,833 10,566 5,833 37,370 17,142
ISC - Secondary (Amps Short Circuit LG) 11,509 14,323 7,242 7,242 11,509 7,242 52,555 20,658
*Assumes unlimited primary short-circuit current (infinite bus)
Faults calculated using Cooper Bussman Short Circuit Current Calculations
Grand Canyon - Inner Canyon Distribution Transformer
(Secondary Service Available Fault Current)*
TMOORE
Text Box H.3 Phantom Ranch Single-Phase Transformers Short Circuit Calculations
File details come from the government source that posted it. Updated .