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shengjiboy
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Join Date: Nov 2010
Posts: 4

Fault Level Evaluation of 11kV Network

02/20/2011 11:01 PM

Hello..

Can anyone please guide me on how to calculate the three phase fault level at each bus, while still maintaining power flow to substations A and B without overloading the feeders? For example, case 1: X0, Y0 are open, all other circuit breakers are closed.

Thank you very much!!
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TonyS
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Join Date: Aug 2010
Location: Resting under the Major Oak
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#1

Re: Fault Level Evaluation of 11kV Network

02/20/2011 11:30 PM

Homework?

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shengjiboy
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#2
In reply to #1

Re: Fault Level Evaluation of 11kV Network

02/21/2011 12:53 AM

Yaya...:)
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theravellerzt
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Join Date: Mar 2011
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#14
In reply to #2

Re: Fault Level Evaluation of 11kV Network

03/08/2011 8:19 PM

Shenji, can u share me the coding?~
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loadshare
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Engineering Fields - Electrical Engineering - New Member Engineering Fields - Mechanical Engineering - New Member

Join Date: Jan 2011
Location: Jakarta
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#3

Re: Fault Level Evaluation of 11kV Network

02/21/2011 1:06 AM

:-P

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electricalexpert65
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Join Date: Oct 2009
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#4

Re: Fault Level Evaluation of 11kV Network

02/21/2011 9:17 AM

Can you afford my consultancy fees?
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Anonymous Poster
#5

Re: Fault Level Evaluation of 11kV Network

02/22/2011 1:08 AM

if u provide ur email id i can forward the copy of calculation in excel sheet for ur reference.
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Abdul_Gafoor_MK
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Join Date: Feb 2011
Posts: 5
#6
In reply to #5

Re: Fault Level Evaluation of 11kV Network

02/22/2011 1:34 AM

can you please also forward to this mail id Thank You,

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shengjiboy
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Join Date: Nov 2010
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#7
In reply to #5

Re: Fault Level Evaluation of 11kV Network

02/22/2011 7:44 AM

thank u very much!!

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theravellerzt
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Join Date: Mar 2011
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#11
In reply to #7

Re: Fault Level Evaluation of 11kV Network

03/06/2011 12:47 AM

can u email 2 me too?
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theravellerzt
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Join Date: Mar 2011
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#12
In reply to #5

Re: Fault Level Evaluation of 11kV Network

03/06/2011 12:49 AM

can u email 2 me too?
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Taj gouda
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Join Date: Mar 2011
Posts: 2
#8

Re: Fault Level Evaluation of 11kV Network

03/03/2011 12:26 AM

Hi Shengiboy, Have you successfully answered this question?
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shengjiboy
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Join Date: Nov 2010
Posts: 4
#9
In reply to #8

Re: Fault Level Evaluation of 11kV Network

03/03/2011 10:31 PM

hello there!

in the process of answering..
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Taj gouda
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Join Date: Mar 2011
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#10
In reply to #9

Re: Fault Level Evaluation of 11kV Network

03/04/2011 6:06 AM

okay, tell me when you are done. am also trying to solve it.
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jaiZi
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Join Date: Mar 2011
Posts: 1
#13

Re: Fault Level Evaluation of 11kV Network

03/08/2011 11:27 AM

hey shengjiboy.do you have complete the calculation?
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theravellerzt
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Posts: 4
#15

Re: Fault Level Evaluation of 11kV Network

03/10/2011 12:16 AM

someone plz help me...share me the coding~
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gemstar
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Join Date: Mar 2011
Posts: 1
#16

Re: Fault Level Evaluation of 11kV Network

03/14/2011 11:59 AM

i know to do this 1..any payment?
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mprajaneb
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Join Date: Oct 2010
Posts: 2
#17

Re: Fault Level Evaluation of 11kV Network

04/07/2011 4:09 AM

Assumptions: CB X0, Y0 are open and all other CBs are closed.

Impedance offered to 132X bus by system = Base MVA/Fault level

= 100/2700 = 0.037pu

Impedance offered to 132Y bus by system =0.056pu

impedance of T1 to base value = Tx. impedance*base MVA/Tx. MVA

= 0.267pu

impedance of T2 to base value =0.267pu

impedance of T3 to base value= 0.222pu

impedance of T4 to base value =0.222pu

impedance of line XA1 to base value = imp. in ohms *Base MVA/line KV^2

= 1.134pu

impedance of line XA2 to base value =1.134pu

impedance of line YB1 to base value =0.235pu

impedance of line YB2 to base value =0.235pu

impedance of line AB4 to base value =0.471pu

On the occurance of a fault on bus 11B1 - 11B2, the effective impedance =0.23pu (draw the single line diagram and estimate the equivalent impedance)

Fault level on 11B1 / 11B2 = base MVA/effective impedance upto the bus

= 434.53MVA, 22807 Amps.

On the occurance of a fault on bus 11A1 - 11A2, the effective impedance =0.373 pu (draw the single line diagram and estimate the equivalent impedance)

Fault level on 11A1 / 11A2 = base MVA/effective impedance upto the bus

= 268.13 MVA, 14073 Amps.

Effective impedance on 11X1 = 0.258pu (this needs delta to star conversion and series parallel combination of impedance, in the single line diagram)

Fault level on 11X1 = 387.44MVA, 20335 Amps.

Same fault level on 11X2.

Effective impedance on 11Y1 = 0.205pu (this needs delta to star conversion and series parallel combination of impedance, in the single line diagram)

Fault level on 11Y1 = 488.48MVA, 25638 Amps.

Same fault level on 11Y2.

I checked these values with ETAP demo vesion and obtained more close results.
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Users who posted comments:

Abdul_Gafoor_MK (1); Anonymous Poster (1); electricalexpert65 (1); gemstar (1); jaiZi (1); loadshare (1); mprajaneb (1); shengjiboy (3); Taj gouda (2); theravellerzt (4); TonyS (1)

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