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<font face="Arial">Hello Glenn,<br>
<br>
The UL1741 standard uses IEEE1547 which gives the following;<br>
(use courier or other fixed width font for best viewing)<br>
<br>
<font face="Courier New, Courier, monospace">Voltage
range Clearing time(s)<br>
(% of base voltage)<br>
----------------------------------------<br>
V < 50 0.16 <br>
50 ≤ V< 88 2.00 <br>
110 < V < 120 1.00 <br>
V ≥ 120 0.16 <br>
<br>
<br>
DR size Frequency range (Hz) Clearing time(s)<br>
---------------------------------------------- <br>
≤ 30 kW<br>
--------<br>
> 60.5 0.16 <br>
< 59.3 0.16<br>
<br>
> 30 kW<br>
--------<br>
> 60.5 0.16 <br>
< {59.8 – 57.0} Adjustable 0.16 to 300 <br>
(adjustable set point) <br>
< 57.0 0.16</font><br>
</font><br>
Sincere regards,<br>
Richard Scott<br>
KACO New Energy<br>
<br>
On 12/16/2010 5:52 PM, Glenn Burt wrote:
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<p class="MsoNormal">Does anyone have the text of UL 1741 and
can tell me how much time is allowed for disconnect when loss
of utility grid happens?<o:p></o:p></p>
<p class="MsoNormal">I am thinking between 2-5 cycles?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Glenn Burt<o:p></o:p></p>
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