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reference:fault_current [2024/09/20 00:26] – [References] Alan Sheareference:fault_current [2024/09/20 00:34] (current) – [References] Alan Shea
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 =====Utility Transformers==== =====Utility Transformers====
  
-For utility transformers, a worst-case estimate of available short-circuit current in a three-phase fault can be determined by dividing the transformer ampere rating by the impedance of the transformer. This assumes an infinite utility bus with unlimited current; as this is rarely if ever the case, actual fault current will be limited by available utility bus current. +For utility transformers, a worst-case estimate of available short-circuit current in a three-phase fault can be determined by dividing the transformer ampere rating by the impedance of the transformer.((https://www.jcalc.net/transformer-short-circuit-fault-current-calculator)) This assumes an infinite utility bus with unlimited current; as this is rarely if ever the case, actual fault current will be limited by available utility bus current. 
 \\  \\ 
 +
 ===Three-Phase Fault== ===Three-Phase Fault==
 <WRAP col2> <WRAP col2>
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 </WRAP>  </WRAP> 
 \\  \\ 
 +---- 
 ===Phase to Phase Fault== ===Phase to Phase Fault==
 <WRAP col2> <WRAP col2>
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 </WRAP> </WRAP>
 \\  \\ 
 +---- 
 ===Phase to Neutral Fault==  ===Phase to Neutral Fault== 
 <WRAP col2> <WRAP col2>
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 \\  \\ 
  
-<WRAP 700px>+<WRAP center 650px>
 | **Voltage:** |V = V<sub>LL</sub>  | | **Voltage:** |V = V<sub>LL</sub>  |
 |  <m 14>sqrt{3}</m>  | <m 14>1.732</m> |  |  <m 14>sqrt{3}</m>  | <m 14>1.732</m> | 
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 | **Zero Sequence Impedance:**  | <m 14>Z0 ~=~ 0.85 * Z1</m>((For [[https://en.wikipedia.org/wiki/Transformer#Cores|core-type transformers]] with delta-star-earth connections.))| | **Zero Sequence Impedance:**  | <m 14>Z0 ~=~ 0.85 * Z1</m>((For [[https://en.wikipedia.org/wiki/Transformer#Cores|core-type transformers]] with delta-star-earth connections.))|
 </WRAP> </WRAP>
 +
 =====Generators==== =====Generators====
  
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 ===References=== ===References===
  
-  * [[http://cumminspower.com/www/literature/applicationmanuals/t030.pdf|Liquid Cooled Generator Application Manual [PDF - 10Mb]]] +  * [[https://web.archive.org/web/20131130123633/http://cumminspower.com/en/technical/application/|Cummins Power, Application Engineering Manuals]] 
-  * [[http://cumminspower.com/www/en/technical/application/t-016.pdf|Paralleling Application Manual [PDF - 10Mb]]]+    * [[https://web.archive.org/web/20131130123633/http://cumminspower.com/www/literature/applicationmanuals/t030.pdf|Liquid Cooled Generator Application Manual [PDF - 10Mb]]] 
 +    * [[https://web.archive.org/web/20131130123633/http://cumminspower.com/www/en/technical/application/t-016.pdf|Paralleling Application Manual [PDF - 10Mb]]]
  
reference/fault_current.1726791963.txt.gz · Last modified: 2024/09/20 00:26 by Alan Shea

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