Wye-Wye to 100kW Xantrex blows utility meter fuse [RE-wrenches]

[William Korthof]

<x-flowed>
Mark,

Did you verify that the phase rotation was correct?

If not, A B and C currents are dissimilar and the PF
is bad. If so, just swap any *two* phase connections:
A:B, B:C, or A:C.

/wk

At 09:24 AM 9/2/03 -0700, Bill Brooks wrote:
>Mark,
>
>Why are you using #2 Wire? Seems too small to me. You could be overheating
>the wire and fuse and the fuse is failing based on temperature, not current.
>Increase your wire size to #1/0 copper or #4/0 aluminum, and your problem
>may resolve itself.
>
>Bill.
>
>-----Original Message-----
>From: Mark Robinson [mailto:Mark at TheEnergyGrid.com]
>Sent: Tuesday, September 02, 2003 8:30 AM
>To: RE-wrenches at topica.com
>Subject: Wye-Wye to 100kW Xantrex blows utility meter fuse [RE-wrenches]
>
>
>Just finished installing a 124kw system in El Cajon. (very sweet.. see
>photos at www.Nextekpower.com) 4kW is connected to the Nextek DC lighting
>system... that part works great. 120k is connected to a 100k PV-100208
>Xantrex. We're blowing the AC fuse on the C leg at the utility meter and we
>think it may have to do with the isolation transformer.
>If you've had any experience with this, please let me know.
>
>Here are the Details:
>SDGE comes in with 480/277 3 phase Wye transformer.
>Ideally, It would make sense to use a Wye Delta Isolation transformer to the
>Xantrex but, because of costs (and with the blessings of Xantrex) we used a
>Wye-Wye with and X0 not connected (floating).
>At the Utility meter, and all-in-1 test section with pullout fuses, the
>three phases are protected with JLLS 150 AMp Fuses. The C Phase keeps
>blowing and the #2 wires are hot.
>No Unusual THD reading although there is 6A on the neutral, which Xantrex
>says is normal (??) in a system this size.
>Xantrex says we should remove the connection to H0 at the transformer and
>replace the fuse with a 175 AMP... suitable for the wire but not ideal
>according to the 125% rule.
>
>Thoughts?
>
>Mark Robinson
>The Energy Grid
>
>
>VP Sales and Marketing
>
>Nextek Power Systems, Inc.
>
>89 Cabot Court, Suite L
>
>Hauppauge, NY 11788
>
>(603) 305-1942
>
>www.NextekPower.com
>
>- - - -
>To send a message: RE-wrenches at topica.com
>
>Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
>
>List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
>
>Check out participant bios: www.mrsharkey.com/wrenches/index.html
>
>Hosted by Home Power magazine
>
>Moderator: michael.welch at homepower.com
>
>- - - -
>To send a message: RE-wrenches at topica.com
>
>Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
>
>List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
>
>Check out participant bios: www.mrsharkey.com/wrenches/index.html
>
>Hosted by Home Power magazine
>
>Moderator: michael.welch at homepower.com

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://www.topica.com/lists/RE-wrenches/

List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm

Check out participant bios: www.mrsharkey.com/wrenches/index.html

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com
--^----------------------------------------------------------------
This email was sent to: michael_welch at sbcglobal.net

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com

TOPICA - Start your own email discussion group. FREE!
http://www.topica.com/partner/tag02/create/index2.html
--^----------------------------------------------------------------


</x-flowed>