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| Calculate %Z autotransformers in open delta? https://brainfiller.com/arcflashforum/viewtopic.php?f=23&t=3687 |
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| Author: | haze10 [ Tue May 05, 2015 7:44 am ] |
| Post subject: | Calculate %Z autotransformers in open delta? |
I have two single phase 480V-120V 75KVA 5.0% Impedance transformers, 625A secondary. They are connected as boosting autotransformers in open delta, 480V primary, 600V secondary. I need to calculate fault current on the secondary. The equivalent transformer capacity would be 625A x 600V x1.73 = 469KVA But I'm not sure how to calculate the equivalent impedance. Any direction to reference material or a mathematical method is appreciated. I am not in a position to physically measure impedance by shorting the secondaries and varying input voltage. gary |
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| Author: | haze10 [ Tue May 05, 2015 9:41 am ] |
| Post subject: | Re: Calculate %Z autotransformers in open delta? |
Correction: Equivalent KVA = (75+75) x2 x.86 = 258KVA |
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| Author: | engrick [ Mon May 11, 2015 10:02 am ] |
| Post subject: | Re: Calculate %Z autotransformers in open delta? |
check out: http://forums.mikeholt.com/showthread.php?t=126891 |
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