[BC] RCA BTA5L

[Peter]

On May 2, 2008, at 2:03 PM, Ron Youvan wrote:

> I have seen many of these, the Scott connected plate
> transformer (3 phase in and 4 phase out) is something
> that I have been trying to get my brain around ever
> since.

"Four-phase", but really two-phase full-wave (for rectifiers), much  
as "six-phase" is really three-phase full-wave.

The transmitter was manufactured in Camden, as I recall, and  
Philadelphia/Camden/Reading was one of the last hold-outs for two- 
phase electrification.

So, the plate supply was two-phase, and this required only four  
relatively expensive thyratrons, instead of six thyratrons, and it  
could be tested on two-phase power in Camden, and then reconnected  
for three-phase and shipped as a three-phase product for installation  
elsewhere.

Niagara Falls, NY, Niagara Falls, ONT and Buffalo, NY also was a hold- 
out for two-phase power.

The Scott-T is traditionally used for two-phase to three-phase and  
three-phase to two-phase conversions, but it may also be used for  
three-phase to three-phase conversions.