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any one knows about Restricted Earth Fault in 7UT612?

Created by: mehri at: 10/5/2009 11:43 AM (3 Replies)

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10/5/2009 11:43 AM	Rate (0)
mehri Posts: 1 Rating: (0)	Hi, any one knows about Restricted Earth Fault in 7UT612,I think both REF in 7UT612 are Low Impedance but in siprotec the 7UT612 has 1 High & 1 Low REF. please help me
mehri Posts: 1 Rating: (0)	Last edited by: O_Moderator at: 10/5/2009 12:03 PM new subject after splitting
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11/2/2009 11:35 AM	Rate (0)
Mike J Platinum Expert Joined: 10/9/2007 Last visit: 1/13/2025 Posts: 1253 Rating: (115)	Hi Take a look at www.siprotec.com . you'll find all manuals for Digsi and Siprotec devices there. Mike J
	Energy Automation products: Sicam, Siprotec, Digsi
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12/21/2010 3:57 PM	Rate (0)
litses Member Joined: 12/14/2010 Last visit: 2/2/2011 Posts: 12 Rating: (0)	REF (or low impedance)needs 2 different current inputs (phase currents of the desired REF side & neutral current)for calculating the differential and restricting current. High impedance needs sizing of the varistor, a resistance and wiring connection for reading the differential current. It is a completely different wiring and philosophy. High impedance works like an overcurrent. Check photo. Attachment REF_High imp.JPG (264 Downloads)

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2/17/2016 10:15 AM	Rate (0)
jigyesh29 Member Joined: 5/11/2015 Last visit: 1/12/2022 Posts: 8 Rating: (0)	Can we use same CT for REF & Differential in HV side with High differential protection.?? If yes please show digramatically!

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