Re: Autotransformer deep questions!
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Same readings, within cursor positioning tolerance…
Also extended the .tran until current transient decayed, around 60+ms.
I plotted the currents in L1 and L2: Essentially identical , but + and – 6+amps?!?
Is that some kind of circulating current in coupled inductors?
Only mA in L6, the separate 18V winding
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From: LTspice@groups.io <LTspice@groups.io>
On Behalf Of John Woodgate
Sent: Thursday, December 26, 2024 2:41 PM
To: LTspice@groups.io
Subject: EXTERNAL: Re: [LTspice] Autotransformer deep questions!
Use the cursor instead of MEAS statements, which are so easily wrongly-written.
On 2024-12-26 22:32, Bell, Dave via groups.io wrote:
.TRAN for 1010ms made no difference; same measurements at 1005m as at 5m
Two things I notice instantly:
Primary voltage should be 311V. Voltages in SPICE are peak.
You don't run a 50Hz transient for only 10ms.
Le 26/12/2024 à 21:40, Bell, Dave via groups.io a écrit :
Please see my recent upload, Autotransformer.zip
I need some tutorials regarding autotransformer modelling!
I was intrigued by Hassan's AC Stabilizer and tried to model TR1
The model differed from my expectations in several ways.
1: Why do the tap-to-tap voltages differ, with equal inductances?
2: Why is the separate 18V winding so different?
2a: Why is it more different when I separate the Kxxx directives?
3: Why do the outputs throw infinities with small or megohm loads, but not when 1G or open??
Dave
--
OOO - Own Opinions Only
Best Wishes
John Woodgate
Keep trying
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Bell, Dave
