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Have You Ever Carried Out Artificial Phase-Earth Fault at 420 kV ?

06/19/2014 7:29 AM

one of fault is at arable field, and other at rocky ground

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#1

Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/19/2014 7:49 AM

Please explain what a <...artificial...fault...> is?

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#2
In reply to #1

Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/19/2014 7:56 AM

Isn't it obvious ? MANMADE. We have carried out that intentionally.

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#4
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/19/2014 9:12 AM

You committed an act of sabotage. You photographed this act of sabotage. You post these photographs on a forum that includes the engineers that risk their lives maintaining what you sabotaged with absolutely no explanation.

Please explain why the police should not be hauling your ass away.

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#8
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/19/2014 10:27 AM

Red,

Because he works for the utility and was doing a preplanned test to capture the reaction of the system to the fault. It's done on an as needed basis but usually in a remote location so as to not cause undue alarm amongst the general public. Your reaction proves why.

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#11
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/19/2014 11:11 AM

An authorized test of protection systems is fine with me. I would not have reacted the way I did if he had stated that this was an authorized test in the first place. [Actually the OP has yet to state this.]

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#20
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/20/2014 12:48 PM

In looking at those pictures (very impressive by the way), it looks as though there are people within a few feet of where the arc returns to earth. Maybe its just an illusion.

I would be looking for a clean pair of undershorts if I was anywhere within a hundred yards of that.

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#21
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/20/2014 2:34 PM

Yes you are right. We taught it will be like first fault,but didnt. And we felt heat of arc on our face. It was very scary but at the same time spectacular.

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#23
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/24/2014 3:57 AM

You live to die!

Better think twice before you do this again!

(Bang, I am glad I was not there and just shake my head in disbelieve . . .)

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#9
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/19/2014 10:53 AM

In that case it is not a fault, so the descriptor <...artificial...fault...> is incorrect. Hence the need for the question - the meaning was unclear.

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#10
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/19/2014 11:01 AM

My ENGLISH BROTHER, Just a little bit tolerate please for my bad english. And you are the one clever engineer.

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#12
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/19/2014 3:11 PM

In power engineering a fault is a fault regardless of what initiates it. It's just an abnormal operation or condition, even something that should have happened but didn't, is considered a fault.

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#29
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

01/23/2025 7:34 AM

How abstruse.

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#3
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/19/2014 9:11 AM

Generally speaking a coil of thin wire is grounded at one end and the other launched over a transmission line. The resulting ground fault is quite spectacular, thanks for the pictures. Hopefully there was full instrumentation to record the transients.

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#5
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/19/2014 9:25 AM

I can send you both of faults all event and osilo records, if you want

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#30
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

01/23/2025 7:38 AM

Ground-breaking stuff, evidently.

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#6
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/19/2014 9:47 AM

EXAMINING OF PHASE-EARTH FAULT AT 420 kV
2nd FAULT (AT ROCKY GROUND)A NZPI> 12IN> 1tIN> 117 Feb 201111.37.42Distance Protection Relay didn't trip.Directional Earth-Fault Protection Relay Tripped.System Frequency: 49,98 HzTotal Fault Time: 1832 msCircuit Breaker Tripping Time: 60 msRelay Tripping Time: 1767 ms
37,73 Km
PREFAULT
IA : 210,8 A < -15,14 degreeIB : 216,7 A < -137,5 degreeIC : 193,4 A < 102,4 degreeIN : 0 A < 0 degree
VA : 235,1 kV < 0 degreeVB : 230,7 kV < -120 degreeVC : 232,3 kV < 120 degreeVN : 3,497 kV < 32,83 degree
FAULT
IA : 1.800 A < -18,21 degreeIB : 193,4 A < -110,4 degreeIC : 137,7 A < 77,06 degreeIN : 1.781 A < -20,01 degree
VA : 216,8 kV < -9,132 degreeVB : 236,5 kV < -119,8 degreeVC : 231,2 kV < 121,7 degreeVN : 49,66 kV < -120,3 degree

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#7
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/19/2014 9:54 AM

EXAMINING OF PHASE-EARTH FAULT AT 420 kV
1st FAULT (AT ARABLE FIELD)A NZ1I> 12IN> 117 Feb 201110.26.54Distance Protection Relay Tripped.System Frequency: 50,00 HzTotal Fault Time: 70 msCircuit Breaker Tripping Time: 61 msRelay Tripping Time: 4 ms
10,05 Km
PREFAULT
IA : 300,3 A < -9,927 degreeIB : 300,9 A < -132,1 degreeIC : 276,3 A < -108,4 degreeIN : 0 A < 0 degree
VA : 236, 2 kV < 0 degreeVB : 231, 7 kV < -120,2 degreeVC : 233, 4 kV < 120 degreeVN : 3,558 kV < 32 degree
FAULT
IA : 7.204 A < -65,18 degreeIB : 588,6 A < -98,51 degreeIC : 167,9 A < -86,53 degreeIN : 7.861 A < -67,98 degree
VA : 72,94 kV < -35,79 degreeVB : 240,5 kV < -123,6 degreeVC : 239,3 kV < 124,4 degreeVN : 213,9 kV < -167,7 degree

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#13
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/20/2014 2:04 AM

That was a great stuff. Thanks for the reports as well.

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#14
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/20/2014 2:22 AM

Good engineers appreciate suchlike works ofcourse like you, but some offscourings grammar teachers don't...

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#15
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/20/2014 2:31 AM

Dear Sir,

Why Didn't the distance protection tripped in the case of the second fault. Both were carried out on the same line at different locations. Hence the Distance protection of two different faults zones should have acted. Please explain. What was your finding???

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#16
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/20/2014 2:52 AM

FAULT

IA : 1.800 A < -18,21 degree

IB : 193,4 A < -110,4 degree

IC : 137,7 A < 77,06 degree

IN : 1.781 A < -20,01 degree

VA : 216,8 kV < -9,132 degree

VB : 236,5 kV < -119,8 degree

VC : 231,2 kV < 121,7 degree

VN : 49,66 kV < -120,3 degree

Plon earthing and arc earthing are very big because of rocky ground.

and notice VA, It is same almost, didn't change too much. Fault empedance located out of latest distance protection zone.

For instance Z1=7Ω, t1=0,0 msec

Z2=11Ω, t2= 400 msec

Z3= 18Ω, t3= 800 msec

Z4= 35Ω, t4=1200 msec

Zreverse=35Ω, tr= 2000 msec

Directional Ground Over Current Tripped in 1767 msec.

Did you see?

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#17
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/20/2014 3:09 AM

Thanks for that update...

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#18
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/20/2014 5:26 AM

Dear Sir,
As stated above that the Fault location for Case 2 was out of Zone of the latest protection relay, Could you please clarify isn't it a usual practice to provide or cover the entire Length of Transmission line through Zonal protection. Is it envisaged to leave some of the zones or lengths of Transmission line not being covered under Distance protection as the same may be taken care by some other relays like the Directional Earth Fault or Over current as happened in Case 2. Please clarify. What was the length of Transmission line and Distance from the Power station and receiving end Substation.
Regards,Raghavendran.R

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#19
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Re: Have you ever carried out ARTIFICIAL PHASE-EARTH FAULT at 420 kV ?

06/20/2014 7:25 AM

lenth of transmission line = 185 Km.

empedance of transmission line :8,1 Ω

1st Zone = 85% Line

2nd Zone = Line + 50% Next Shortest Line

3rd Zone = Line + 100% Next Longest Line

4th Zone = 2 x 3rd Zone

Reverse Zone = 4th Zone

Nearest Power Plant is in distance 150 Km

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#22

Re: Have You Ever Carried Out Artificial Phase-Earth Fault at 420 kV ?

06/20/2014 4:59 PM

Bloody hell! What silly wazzock did that? :-o

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#24
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Re: Have You Ever Carried Out Artificial Phase-Earth Fault at 420 kV ?

06/24/2014 3:58 AM

Whoever put that OT has not read this.

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#25
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Re: Have You Ever Carried Out Artificial Phase-Earth Fault at 420 kV ?

06/24/2014 4:20 AM

I dunno, It is main crucial point of work.

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#26
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Re: Have You Ever Carried Out Artificial Phase-Earth Fault at 420 kV ?

06/24/2014 6:52 AM

Yes. This is an important, infrequent part of maintaining a power grid. It should only be performed by authorized workers.

I wonder what the X-ray dose you absorbed from doing this test? Did you bring any dosimetry with you? It would also be informative to know what Personal Protective Equipment (PPE) you wore?

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#27
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Re: Have You Ever Carried Out Artificial Phase-Earth Fault at 420 kV ?

06/24/2014 7:21 AM

Can you send me line protection schema that you use, relays and settings

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#28
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Re: Have You Ever Carried Out Artificial Phase-Earth Fault at 420 kV ?

06/24/2014 8:55 AM

I wonder why the OT troll doesn't like my replies to this thread.

Oh well, he's an ugly coward anyway. It is probably best we don't hear or see him.

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