600 vdc arc testing [RE-wrenches]
William Miller
wrmiller at slonet.org
Wed Jan 23 08:55:04 PST 2002
PV Geeks:
One problem with the ground located combiner is it removes one of the
advantages of the high voltage array--lower wire losses. Now we are
running our power back and forth from the roof through long leads,
increasing I squared R losses and conduit size.
William
At 06:37 PM 1/21/02 +0000, you wrote:
>Also, we passed the UL1077 tests for our 600 vdc six pole circuit
>breaker on Friday. This PV disconnect allows you to connect six 48 vdc
>nominal PV arrays which are then connected in series for high voltage
>(600 vdc max)once the breaker is closed. It can also be used as a normal
>600 vdc disconnect if the poles are connected in series with wire
>jumpers.
>
After the testing of the breaker we drilled out the rivets and examined
>the contacts - very little wear or evidence was visible. We did over
>300 cycles with load on the breaker during the testing - several even
>with short circuits applied.
>
__________________________________________________________________
William Miller
SLO Communications: Communications and Power Systems Consulting
PO Box 50, Santa Margarita, CA 93453
Voice :805-438-5600 Fax: 805-438-4607 VMail: 805-546-4875
email: wrmiller at slonet.org
License No. C-10-773985
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