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ETAP Project (fault calculation) - Protected View ⚫Saved to this PC Search File Home Insert Draw Design Layout References Mailings Review View Help PROTECTED VIEW Be careful-files from the Internet can contain viruses. Unless you need to edit, it's safer to stay in Protected View. Page 1 of 3 308 words Enable Editing The diagram below shows a HV transmission system supplied by two generating stations (GS1 & GS2). Both generators are operating at rated voltage. At each station the voltage is stepped up to a transmission level voltage. The HV buses are connected by a double circuit line. A load bus is located part way along one of the lines. G1 mm LINE 1 www-m LINE 2 Text Predictions: On O Search PROJECT 2 LINE 3 LOAD LINE 4 www A G2 T2 mm Focus UN Comments Viewing Share × + 100% ENG 10:10 AM ^ 22 US 2024-11-11

ETAP Project (fault calculation) - Protected View ⚫Saved to this PC Search File Home Insert Draw Design Layout References Mailings Review View Help PROTECTED VIEW Be careful-files from the Internet can contain viruses. Unless you need to edit, it's safer to stay in Protected View. Page 1 of 3 308 words Enable Editing The diagram below shows a HV transmission system supplied by two generating stations (GS1 & GS2). Both generators are operating at rated voltage. At each station the voltage is stepped up to a transmission level voltage. The HV buses are connected by a double circuit line. A load bus is located part way along one of the lines. G1 mm LINE 1 www-m LINE 2 Text Predictions: On O Search PROJECT 2 LINE 3 LOAD LINE 4 www A G2 T2 mm Focus UN Comments Viewing Share × + 100% ENG 10:10 AM ^ 22 US 2024-11-11

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter17: Commercial And Industrial Air-conditioning Control Systems
Section: Chapter Questions
Problem 6RQ
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  1. Using a value of SBASE = 100MVA and the system device impedances, calculate the expected fault currents for each type of fault (line - line) using the Per Unit method and symmetrical components. Assume that all generators are operating at their rated voltage. Compare to the values obtained from ETAP. 

 

  1. Draw a symmetrical component sequence network diagram for the Line to Ground fault.

 

 

 

 

 

G1 = 175 MVA
G1 = 19 KV
G1 pf = 0.9
G1 %Xd" = 19
G1 %X2 = 22
G1 %X0 = 8

G2 = 200 MVA
G2 = 18 KV
G2 pf 0.9
G2 %Xd" 18
G2 %X2 22
G2 %X0 6

T1 = 225 MVA
T1 Vpri = 19 KV
T1 Vsec = 345 KV
%Xpos 9
%Xzero 9
%Xneg 9

T2 = 250 MVA
T2 Vpri = 18 KV
T2 Vsec = 345 KV
%Xpos 10
%Xzero 10
%Xneg 10

Line 1
Xpos Ω 60
Xneg Ω 60
Xzero Ω150

Line 2

Xpos Ω 60
Xneg Ω 60
Xzero Ω 150

Line 3
Xpos Ω 225
Xneg Ω 225
Xzero Ω 350

Line 4
Xpos Ω 225
Xneg Ω 225
Xzero Ω 350

Load MVA 115
PF (Lagging) 0.9

 

 

Etap values to verify answers

line – line fault = 1183 A ∠-179.5

 

 

ETAP Project (fault calculation) - Protected View ⚫Saved to this PC Search File Home Insert Draw Design Layout References Mailings Review View Help PROTECTED VIEW Be careful-files from the Internet can contain viruses. Unless you need to edit, it's safer to stay in Protected View. Page 1 of 3 308 words Enable Editing The diagram below shows a HV transmission system supplied by two generating stations (GS1 & GS2). Both generators are operating at rated voltage. At each station the voltage is stepped up to a transmission level voltage. The HV buses are connected by a double circuit line. A load bus is located part way along one of the lines. G1 mm LINE 1 www-m LINE 2 Text Predictions: On O Search PROJECT 2 LINE 3 LOAD LINE 4 www A G2 T2 mm Focus UN Comments Viewing Share × + 100% ENG 10:10 AM ^ 22 US 2024-11-11
Transcribed Image Text:ETAP Project (fault calculation) - Protected View ⚫Saved to this PC Search File Home Insert Draw Design Layout References Mailings Review View Help PROTECTED VIEW Be careful-files from the Internet can contain viruses. Unless you need to edit, it's safer to stay in Protected View. Page 1 of 3 308 words Enable Editing The diagram below shows a HV transmission system supplied by two generating stations (GS1 & GS2). Both generators are operating at rated voltage. At each station the voltage is stepped up to a transmission level voltage. The HV buses are connected by a double circuit line. A load bus is located part way along one of the lines. G1 mm LINE 1 www-m LINE 2 Text Predictions: On O Search PROJECT 2 LINE 3 LOAD LINE 4 www A G2 T2 mm Focus UN Comments Viewing Share × + 100% ENG 10:10 AM ^ 22 US 2024-11-11
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