Re: Why PT's?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "gary weaver" <gary350-at-earthlink-dot-net> 

The dinosaurs are basically bullet proof.  A solid state device would work
the power company maintenance people to death keeping everything working.

Gary


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, November 25, 2003 9:13 PM
Subject: Why PT's?


 > Original poster: "Lau, Gary" <gary.lau-at-hp-dot-com>
 >
 > Here's a question I've always wondered about.  As I understand it,
 > potential transformers are devices designed to step down a 14.4kV or
 > whatever transmission line to a more manageable 120V signal that can be
 > more easily read by the utility companies, so they can see what's
 > happening on their HV lines.  Basically a step-down transformer with a
 > precise turns ratio and a minimal power handling capability, but happily
 > enough so that it's useful in "our" application.
 >
 > These are big, heavy devices.  I would think that a solid state
 > optically isolated equivalent could be easily produced.  Why are these
 > dinosaurs still used by the utility companies?  And why a 120V output?
 > I'm grateful that these devices work so well for our application but...
 >
 > Gary Lau
 > MA, USA
 >
 >