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manir_b4u2002
Associate
India - Member - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Feb 2009
Posts: 38

Directional Over Current / Earth Fault

08/15/2009 9:05 AM

Can anybody explain what is the basic principle of directional over current and directional earth fault relay function. When we used such scheme in substation? plz give reply.

i have follwing date: trafo- 100 MVA, 220KV/33KV, Ynd1, Artificial neutral in delta side by earthing trafo. we are using broken delta PT and there are many PS class CT also in 33 KV panels.
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V.I.Abraham
Guru
Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

Join Date: May 2007
Location: Pune , India
Posts: 875
Good Answers: 42
#1

Re: Directional Over Current / Earth Fault

08/15/2009 1:12 PM

Dear manir,

Please read the following link . This is from the Book " Power system Commissioning and Practice by Keith Harker.This gives elaborate details of directional overcurrent and earth fault protection. Chapter 13

Regards

http://books.google.com/books?id=uugjB9YAsnUC&pg=PA309&lpg=PA309&dq=Principle+of+directional+overcurrent+and+earth+fault+relay&source=bl&ots=ZL1MNy92FV&sig=tTFFDI_sf_p61yCxN8KI3wcJtF8&hl=en&ei=M-mGStfvM4Gltgep2djnDA&sa=X&oi=book_result&ct=result&resnum=5#
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ramvinod
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Join Date: Jun 2007
Location: chennai,India
Posts: 592
Good Answers: 19
#2
In reply to #1

Re: Directional Over Current / Earth Fault

08/16/2009 1:07 AM

Good reference

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 Ramesh,Freelance Electrical/automation Consultant
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