- posted
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.

Thanks.

Frank White

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