Transformer Impedance-Inrush
Transformer Impedance-Inrush
(OP)
Its a liquid filed 3000KVA/4000KVA, 13.8/600 delta wye, z=10%. Is inrush current still 12 time the FLA for .1 sec?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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Transformer Impedance-Inrush
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RE: Transformer Impedance-Inrush
RE: Transformer Impedance-Inrush
JIM
RE: Transformer Impedance-Inrush
According to Siemens "Formel und Tabellenbuch" the inrush current depends upon Rated Power .So for 3000/4000 KVA would be 6 [from 13.8 kV] and 10 supplied from 0.6 kV. The inrush current amplitude would be half of the above value for at least 10 up to 60 cycles. For 60 Hz [one cycle=1/60 second] from 1/6 up to 1 second. So for 0.1 seconds would be sure above the half.
Best Regards
RE: Transformer Impedance-Inrush
what is siemens "Formel und Tabellenbuch" ?
Thanks for the responce though. I am also woriied about cold and hot load pick up. cold load pick up could be 15 times more right? any information on these values?
RE: Transformer Impedance-Inrush
Source impedance does have an effect, as you suggest. There was some discussion here several months ago regarding a white paper by S&C that discussed this issue. You might search this forum or see if you can find it on S&C webpages.
RE: Transformer Impedance-Inrush
http://www.sandc.com/webzine/2003/012003_1.asp
A great reference.
RE: Transformer Impedance-Inrush
These items are different from the magnetizing inrush in both magntiude and duration. You need to differentiate if the load is a utility feeder residential, industrial load etc all of which may have much different characteristics.
JIM
RE: Transformer Impedance-Inrush
RE: Transformer Impedance-Inrush
Siemens AG is well known Manufactory company for Electrical Product including High Voltage Equipment and Transformer.
The actual table [Translated] is as follows:
Siemens AG Berlin Muenchen
Formel- und Tabellenbuch für Starkstrom-Ingenieure [Formula and table book for power engineers] 1965[see attachment]