[SBE] Phasor current draw

[ednixon at yahoo.com]

What power levels ?

--- Original Message ---
From:"Edwin Bukont" <ebukont at msn.com>
Sent:Mon 7/13/09  1:11 pm
To:"sbe" <sbe at sbe.org>
Subj:[SBE] Phasor current draw


I am trying to create a DA/NDA remote control for a 3-tower phasor system.  The system has remote for choosing transmitters and Day or Nite. It does not have remote for choosing DA/NDA.

 

Currently, someone has brought out the Tx and D/N to 240VAC relays with 30A contacts.  Is this really necessary?

 

The mode change itself appears to throw maybe 5 contactors including the towers.  I realize that in the DA mode it has to support the current involved with switching of Day and Night.

 

I want to do my additional control with a 24VDC coil and contacts rated at 15A/250VAC.

 

Am I missing something here.  Do I really need those big power relays or will something smaller suffice.  I do not know what the current draw is,,and it would be difficult to amp clamp.

 

Anybody have any ideas what a 30-40 year old three tower, 3 modes Phasor array might draw in Amps at 250VAC during switching?

 

Thanks

Edwin Bukont CSRE, DRB, CBNT 
V- 240.417.2475; F- 240.368.1265 

 

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