Re: Homemade Voltage Divider

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>


It's also very simple to do this type of 
measurement by simply monitoring the input 
potential to the power xmfr.  This is the way 
most modern x-ray xmfr systems do it.

For example, a primary meter movement is 0-120 
VAC and the meter is calibrated as 0-12 kV 
AC.  At the 100 volt mark on the meter you are 
delivering 10 kV Erms on the sec. side of the 
xmfr.  You can also just carry this over to 
rectified DC capacitor charging knowing that Erms 
x 1.414 equals the peak DC capacitor (charged) 
potential. The meter is calibrated with DC kiloVolts on the face accordingly.

It's easy to do and always accurate since the 
xmfr ratio never changes. Initial (test) 
measurements are taken with a HV probe or divider 
to insure accuracy on the meter calibration.

HV power lines and substation techniques are 
similar.  They use a PT (potential xmfr), for 
example, a 69 kV to 120 VAC provides full output 
potential metering on a standard 0-120 VAC meter 
that has it's face calibrated 0-69 kV.

Dr. Resonance




Original poster: DRIEBEN@xxxxxxxxxxxxxxx

Hi Jim,

I'm pretty sure that R. Hull had the measurement
of a known fraction of HVAC when suggesting the use
of an NST to measure HV, as the 15kv/120v ratio can
easily be multiplied by the output measurement of
the reversed NST. However, I am trying to measure
high voltage DC since I'm trying to guage the ap-
plied voltage to the terminal of a huge capacitor
bank that I'm trying to charge. The reverse NST
measurement method that you propose would only
give resaonbly accurate measurement data for high
voltage AC.

David Rieben

----- Original Message -----
From: Tesla list <tesla@xxxxxxxxxx>
Date: Friday, January 27, 2006 2:45 pm
Subject: Re: Homemade Voltage Divider

> Original poster: "James Zimmerschied" <zimtesla@xxxxxxx>
>
> I am pondering a way to reliably measure 10 KVDC
> across the terminals of (2) 100 µFd energy dis-
> charge caps Original poster: "David Rieben"
>
> David
> Richard Hull showed the use of a NST is reverse
> to measure high voltages. This might be bulky but reliable.
> Jim Zimmerschied
>
>