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Anand_07
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Join Date: Jul 2017
Posts: 4

Protection

07/03/2018 12:57 AM

What are the consequences or affects of incorrect phase sequence in protection relay such as distance, overcurrent or earthfault protection of transmission line.
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raghun
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Join Date: Jan 2010
Location: Hyderabad
Posts: 343
Good Answers: 22
#1

Re: Protection

07/03/2018 2:29 AM

Nothing I suppose except the phase identification will be incorrect, when fault occurs.

The incorrect phase sequence reflects in both CT and VT signals, thus nullifying the effect on directionality of protection elements.

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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#2

Re: Protection

07/03/2018 3:47 AM

Dismissal for incompetence is among the possibilities.

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Rixter
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Join Date: Apr 2010
Location: About 4000 miles from the center of the earth (+/-100 mi)
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#3

Re: Protection

07/03/2018 9:11 AM

If you're talking about paralleling a generator with the wrong sequence, very bad things will happen if the overcurrent relay doesn't trip fast enough.
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brich
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Location: sometimes Wales,UK.. was Libya, now Oman!
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#5

Re: Protection

07/04/2018 4:12 AM

Anand.....

No please or thank you?

I'm sure your manners are much better really!

Two things... First... Is this a project or home work question?

Second... Do you have any idea what you have just asked?

I can tell from the question that you know very little about the effects of electricity and the dangers they pose and the effects of a short circuit which, if you were knowledgeable, you would know that incorrect phase sequence is a short circuit.

So to enlighten you.. take a look at this LINK

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RAMConsult
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Engineering Fields - Power Engineering - New Member

Join Date: May 2007
Location: NYC metropolitan area.
Posts: 3230
Good Answers: 444
#6
In reply to #5

Re: Protection

07/04/2018 10:22 AM

"..you would know that incorrect phase sequence is a short circuit.." No it is not, but it is the leading cause of motors turning in the wrong direction, and in the case of the OP's original question, misoperation of the protective relaying system.

btw- the arc flash demo illustrates what does happen when a dead-short occurs, and what would be the result of connecting two: out of phase, out of sync, mismatched voltage/frequency, etc., systems together.

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Users who posted comments:

brich (1); lyn (1); PWSlack (1); raghun (1); RAMConsult (1); Rixter (1)

Previous in Forum: Excitation Problem with Parallel Operation of Turbo Generator   Next in Forum: ACS 850: What is A.154 or A.70

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