Static Excitation Pt. 2: Reactors
Static Excitation Pt. 2: Reactors
(OP)
Question 1: How can a reactor (inductor) limit short circuit current?
Question 2: How can i do a QnD measurement of the inductance of the reactor without use of expensive DMMs?
Question 2: How can i do a QnD measurement of the inductance of the reactor without use of expensive DMMs?






RE: Static Excitation Pt. 2: Reactors
Answer to Q2: Consulting the documentation provided by the manufacturer/distributor, or checking out the nameplate of the reactor.
RE: Static Excitation Pt. 2: Reactors
I'm not sure what would make this question specific to a static excitation system, although reactors are often found within the large semiconductor rectifiers used in static AVR's if several diodes or thyristors have been paralleled to increase current rating. The reactors are primarily to improve current sharing between devices and to calm down very high di/dt edges caused by thyristor switching. The reactor slows the rising edge of the current allowing time for the full silicon die to reach a conducting state and thus avoid current crowding and thermal runaway in local hotspots which can occur if the die is partially conducting.
Guessing reactor impedance is a tough question - it depends on the construction of the reactor. Air cored types are harder to predict than those with an iron core. The presence or absence of an airgap in a iron cored type makes a difference too. You should refer to a high school physics textbook for some calculation methods for inductance of various coils. You will gain some useful understanding of the principles too.
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RE: Static Excitation Pt. 2: Reactors
On static excitation application, probably your referring to SATURABLE CORE REACTORS.. It was also used on static stepless motor control, brush generator static excitation system, though obsolete(i think).