McDiarmid | Schneider Electric | Solar Business | CANADA |
Regulatory Compliance Engineering
From:
Pete Perkins 0061f3f32d0c-dmarc-requ...@ieee.org
To:
EMC-PSTC@LISTSERV.IEEE.ORG,
Date:
08/08/2014 05:47 PM
Subject:
Re: [PSES] question with regard of inverter
Peter
Dear Rich, dear Doug
Thank you very much for your professional answer. I really appreciate it. It
helps me a lot and also to my client.
One more question, is there any expert in this group who has real experience
with new Hazard Based Standard IEC 62368-1? We are currently working on few
@LISTSERV.IEEE.ORG
Reply To: Boštjan Glavič
Subject: Re: [PSES] question with regard of inverter
Dear Rich, dear Doug
Thank you very much for your professional answer. I really appreciate it. It
helps me a lot and also to my client.
One more question, is there any expert in this group who has real
Sent: Friday, August 8, 2014 8:51 AM
To: EMC-PSTC@LISTSERV.IEEE.ORGmailto:EMC-PSTC@LISTSERV.IEEE.ORG
Reply To: Boštjan Glavič
Subject: Re: [PSES] question with regard of inverter
Dear Rich, dear Doug
Thank you very much for your professional answer. I really appreciate it. It
helps me a lot
Dear Boštjan:
I participated in most of the drafting of IEC 62368-1. Please
feel free to ask questions. So did Pete Perkins. I don't know
if others also subscribe to this group.
Best regards,
Rich
On 8/8/2014 7:51 AM, Boštjan Glavič wrote:
Dear Rich, dear Doug
Thank you very much for
Compliance Engineering
From:
John Woodgate j...@jmwa.demon.co.uk
To:
EMC-PSTC@LISTSERV.IEEE.ORG,
Date:
08/06/2014 01:53 PM
Subject:
Re: [PSES] question with regard of inverter
In message 53e28a32.4020...@ieee.org, dated Wed, 6 Aug 2014, Richard
Nute ri...@ieee.org writes:
. Your solar
IEC 62109-1 considers “PV circuits in general” to be OVCII.
Regards,
Peter Tarver
*From:* McDiarmid, Ralph [mailto:ralph.mcdiar...@schneider-electric.com]
*Sent:* Friday, August 08, 2014 13:57
*To:* EMC-PSTC@LISTSERV.IEEE.ORG
*Subject:* Re: [PSES] question with regard of inverter
My
...@enphaseenergy.com]
Sent: Friday, August 08, 2014 3:47 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] question with regard of inverter
IEC 62109-1 considers “PV circuits in general” to be OVCII.
Regards,
Peter Tarver
From: McDiarmid, Ralph [mailto:ralph.mcdiar...@schneider
Dear experts,
I am trying to figure out how to determine correct spacings for non-isolated
inverter. According UL1741 OVC IV needs to be considered for inverter. From
table 8.1 from UL840 I get a transients of 8,0kV for 450VDC input. Is that
correct?
Output of inverter is connected to AC grid
Dear Boštjan:
Despite UL1741 and UL 840, OVC does not apply to DC. There is
no research that I know of that supports use of AC OVC to DC.
If the 450 V DC is not outside the building or is otherwise not
subject to lightning-caused overvoltages, OVC does not apply.
Likewise, if the 450 V DC
Dear Rich,
Thank you. DC input comes from solar cells therefore from outside. UL 1741
states that OVC IV needs to be used and for 120/240V it means 4000V. So what
transient should I use from DC side?
Why table 8.1 in UL840 also mentions dc input?
Best regards,
Bostjan
Boštjan Glavič
Vodja
Bostjan,
Even though PV array can be subject to lightning strikes, to my knowledge
there is no specific requirement for OV transients occurring on the DC side
of your inverter. This leaves you in a bit of a quandary fro spacings
determination on the DC side, especially if you have no transformer
Dear Boštjan:
If the solar cells are hit by lightning, then the DC and inverter
system will likely be destroyed, and the transient will propagate
into the AC system. There is no way to protect against a direct
lightning strike except to use a system of lightning rods, and
they may not provide
In message 53e28a32.4020...@ieee.org, dated Wed, 6 Aug 2014, Richard
Nute ri...@ieee.org writes:
. Your solar cell DC source is not
subject to load switching, but is subject to a direct lightning
strike.
Your DC OVC due to load switching is zero, and your OVC due to
lightning is beyond OVC
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