Effect of a fault on a voltage source
- Thread starter mull982
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gar
Senior Member
- Location
- Ann Arbor, Michigan
- Occupation
- EE
080915-2114 EST
An ideal voltage source has an absolutely constant voltage output. This is what you work with theoretically in an equivalent circuit.
A real world voltage source will generally be assumed to be an ideal voltage source with some series internal impedance, or an ideal current source with a shunt internal impedance. You can use either as your source.
The short circuit current is determined by the ideal voltage source, and its internal impedance in series with whatever is the external short circuit impedance.
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An ideal voltage source has an absolutely constant voltage output. This is what you work with theoretically in an equivalent circuit.
A real world voltage source will generally be assumed to be an ideal voltage source with some series internal impedance, or an ideal current source with a shunt internal impedance. You can use either as your source.
The short circuit current is determined by the ideal voltage source, and its internal impedance in series with whatever is the external short circuit impedance.
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Strahan
Senior Member
- Location
- Watsontown, PA
AC or DC? I have seen countless times where a fault occurs on a DC power supply drawing the voltage level down. Once the fault is determined and fixed the supply returns to nominal level. Of course this is on lower voltage scale typically 24vdc.
brian john
Senior Member
- Location
- Kilmarnock, Va
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- Retired after 52 years in the trade.
Strahan said:
With a limited source.
gar
Senior Member
- Location
- Ann Arbor, Michigan
- Occupation
- EE
080916-0913 EST
mull982:
Study this on-line reference on Thevenin and Norton equivalent circuits. If this is insufficient, then ask some more questions and I will try to find another reference.
http://www.facstaff.bucknell.edu/mastascu/eLessonsHTML/Source/Source2.html
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mull982:
Study this on-line reference on Thevenin and Norton equivalent circuits. If this is insufficient, then ask some more questions and I will try to find another reference.
http://www.facstaff.bucknell.edu/mastascu/eLessonsHTML/Source/Source2.html
.
gar
Senior Member
- Location
- Ann Arbor, Michigan
- Occupation
- EE
080916-1146 EST
mull982:
The internal impedance is a function of a number of items. For a transformer it is both the resistance of the windings, both primary and the secondary, and the leakage flux of the transformer, primary flux that does not couple to the secondary, which is described as the leakage inductance.
Short lengths of branch wiring can be consider as primarily resistive.
If you look toward the incoming power source at your main panel, then the equivalent source impedance is made up of everything going back to the power plant generators. However, the significant portion of this starts at your pole transformer.
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mull982:
The internal impedance is a function of a number of items. For a transformer it is both the resistance of the windings, both primary and the secondary, and the leakage flux of the transformer, primary flux that does not couple to the secondary, which is described as the leakage inductance.
Short lengths of branch wiring can be consider as primarily resistive.
If you look toward the incoming power source at your main panel, then the equivalent source impedance is made up of everything going back to the power plant generators. However, the significant portion of this starts at your pole transformer.
.
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