Earth Fault Protection relays
Earth Fault Protection relays
(OP)
Would someone please be able to explain to me how Earth Fault protection relays work for electrical industry on LV Switchboards.
Regards
GAZ
Regards
GAZ
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
Download nowINTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Earth Fault Protection relays
|
RE: Earth Fault Protection relays
rather than type out this is what i have found useful. i believe it is rarer to find just a Earth Fault protection relay more likely to have it included in a Residual Current Operated Circuit Breaker With Integral Overcurrent Protection. (RCBO) That way you get earth fault currents, overloads and short-circuits protection.
Hope that helps.
Johnny H-S BSc(Hons) MInstMC
Engineers like to solve problems. If there are no problems handily available, they will create their own problems.
RE: Earth Fault Protection relays
Most E/F relays are a sub-set of overcurrent relays, and are basically a standard overcurrent relay connected to either a CT in the neutral earthing connection or in the residual of a three-phase CT group. Earth fault relays may be instantaneous, definite minimum time, or inverse-time. Inverse-time relays often have a high-set value above which an instantaneous trip occurs.
One of the better known types is the GEC Relays MCGG, now marketed by Areva http://w
You could do worse than register and download the Network Protection & Automation Guide from Areva's website, or trawl the net for the Art & Science of Protective Relaying. I have to admire the logic by which Areva decided to stop publishing the NPAG: "It's proving very popular, therefore we'll discontinue publication".
----------------------------------
If we learn from our mistakes I'm getting a great education!
RE: Earth Fault Protection relays
In additional to Scotty's recommendation...also with registration..., a very good documents on the site:
http://www.i-gard.com/ exactly what you need, ground/earth fault on LV SWB.
Good Luck.
Slava
RE: Earth Fault Protection relays
Regards
Gaz