15 years ago
This is basically a voltage divide array of identical 2% tolerance
resistors that are arranged in a WYE configuration with 4 series
conected 300Kohm resistors in each leg.
I connected the input to a 3 phase 4 wire supply of 213V - 215V
along points a-a-a in any combination I measure 153V-155V
along points b-b-b (center) in any combination I measure 100V- 101V
along points c-c-c in any combination I measure 51V
across each resistor there is 29V-30V dropped
from any input line to neutral I measure 123V to 124V
A little high, this is from a 120V/208V 3 phase 4 wire system.
I would expect that since point b-b-b is exactly half way between
line (average 214V) and neutral (average 0V) I would measure line/2
or 107 volts phase to phase here.
I dont however, I measure 100V which confuses me. I am really rusty on
my 3 phase calculations and hope someone can shed some light on this.
I am trying to create a voltage divider that will give me exactly half
the line voltage.
Remove dashes "-----------" to e-mail.