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RCD trip times

 
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rpelec



Joined: 26 Nov 2006
Posts: 3
Location: Dorset
PostPosted: Sun Nov 26, 2006 4:20 pm    Post subject: RCD trip times Reply with quote
I have an RCD that trips within 0.4 seconds at 1 and 5 times for 0 degrees but takes a lot longer for 180 degrees. Any ideas as to a relevent problem?
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vince knight
Moderator


Joined: 04 Mar 2004
Posts: 1334
Location: Essex/East London
PostPosted: Sun Nov 26, 2006 9:16 pm    Post subject: Reply with quote
Whaat are the times for the 180 degree setting and what if any was your problem in the first place please.

Vince
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rpelec



Joined: 26 Nov 2006
Posts: 3
Location: Dorset
PostPosted: Mon Nov 27, 2006 4:09 pm    Post subject: RCD trip times Reply with quote
The 180 degree trip time was 2.6s on a ring final that I wanted to add spur to. Until I tested it I did not know of a fault.

Rick
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vince knight
Moderator


Joined: 04 Mar 2004
Posts: 1334
Location: Essex/East London
PostPosted: Mon Nov 27, 2006 10:15 pm    Post subject: Reply with quote
What type of earthing system do you have, TT, TN-S, TNC-S etc please and what is your Ze reading.

Vince
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rpelec



Joined: 26 Nov 2006
Posts: 3
Location: Dorset
PostPosted: Tue Nov 28, 2006 4:50 pm    Post subject: RCD trip times Reply with quote
Hi,
The earthing system is TN-S and the measured Ze is 0.3 ohms.

Rick.
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