Re: Reactor inductance measurement

On Sat, 1 Jul 2006 00:33:34 +1000, "Phil Allison"
<philallison@xxxxxxxxxx> wrote:


"John Larkin"

Hi, i need to measure the inductance of a 70kVA linear reactor. What
are the most cost effective (e.g. cheap) options? I already measured it
with a bench LCR meter, but i do not trust the results; it read 5mH.


Try applying a DC voltage, say from a bench power supply, and noting
how the current rises with time.

L = E * T / I

Some of the big utility transformers take, I think I heard, minutes to
ramp up.



** Is the manic, the depressive or the autistic John Larkin talking here ?


At your service!

Or maybe just a pedantic bloody fool who cannot spot a novice's typo ?

Where's the error?

I do know that big utility transformers are tested this way. Their
inductances can be in the kilohenries, and losses and distributed
capacitance are way too high for conventional LC bridges to measure
anything sensible.

John


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