Re: Autotransformer deep questions!
|
Ahh, unloaded, so (little to) no reflected impedance!
In this simplified circuit, L2 is on top of L1, and is the 220V input, so the same current flows in L1.
I tried loading the (buck, 210V) tap between L2 and L1.
With any load <6 Meg, it blows up into infinities again, or in some config, threw a singular matrix error.
переключити цитоване повідомлення
Показати цитований текст
From: LTspice@groups.io <LTspice@groups.io>
On Behalf Of Jerry Lee Marcel via groups.io
Sent: Thursday, December 26, 2024 3:00 PM
To: LTspice@groups.io
Subject: EXTERNAL: Re: [LTspice] Autotransformer deep questions!
Le 26/12/2024 à 23:49, Bell, Dave via groups.io a écrit :
I plotted the currents in L1 and L2: Essentially identical , but + and – 6+amps?!?
Impedance of a 100mH inductor at 50Hz=31 ohms
220V into 31 ohms= about 7 amps
Is that some kind of circulating current in coupled inductors?
Only mA in L6, the separate 18V winding
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
|
Приєднайтеся до {LTspice@groups.io, щоб автоматично отримувати всі повідомлення групи.
Bell, Dave
