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.  
>


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William Miller
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email: wrmiller at slonet.org
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