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Due to the enlarging of served area, it is decided to change the line to line primary voltage. Assuming that number of feeders of the new area A2 is 10 and using voltage square factor, The new primary voltage VLLnew that should be used in the new substation SS1 is:

Due to the enlarging of served area, it is decided to change the line to line primary voltage. Assuming that number of feeders of the new area A2 is 10 and using voltage square factor, The new primary voltage VLLnew that should be used in the new substation SS1 is:

Power System Analysis and Design (MindTap Course List)
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter6: Power Flows
Section: Chapter Questions
Problem 6.61P
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Assuming a distribution substation SSO has a capacity of 30MVA with input - output voltages are 66KV - 9KV. SSO is feeding a square shaped area A1 by 4 primary feeders where A1=4 km2 with load density D1=2000KW/Km2. the operating voltage of primary feeders was 5.2KV / 9KV. After 30 years, the area fed by SSO will be enlarged to become circular shape A2 with radius R=L2 = 4KM (as shown in the figure). The load density of the extended area (A2 - A1) remains the same of the old area. For info, all loads in area A1 and (A2-A1) are lagging with PF=0.8 Area A2 D2=01 Area A1 D1 Area A1 D1 S1 SSo 12 = New Feeder L1= Old Feeder Due to the enlarging of served area, it is decided to change the line to line primary voltage. Assuming that number of feeders of the new area A2 is 10 and using voltage square factor, The new primary voltage VLLnew that should be used in the new substation SS1 is Select one: Оа. 2690KV Ob. 23.90KV Oc 24.90KV O d. 25.90KV Oe. 22.90KV O f. None of these
Transcribed Image Text:Assuming a distribution substation SSO has a capacity of 30MVA with input - output voltages are 66KV - 9KV. SSO is feeding a square shaped area A1 by 4 primary feeders where A1=4 km2 with load density D1=2000KW/Km2. the operating voltage of primary feeders was 5.2KV / 9KV. After 30 years, the area fed by SSO will be enlarged to become circular shape A2 with radius R=L2 = 4KM (as shown in the figure). The load density of the extended area (A2 - A1) remains the same of the old area. For info, all loads in area A1 and (A2-A1) are lagging with PF=0.8 Area A2 D2=01 Area A1 D1 Area A1 D1 S1 SSo 12 = New Feeder L1= Old Feeder Due to the enlarging of served area, it is decided to change the line to line primary voltage. Assuming that number of feeders of the new area A2 is 10 and using voltage square factor, The new primary voltage VLLnew that should be used in the new substation SS1 is Select one: Оа. 2690KV Ob. 23.90KV Oc 24.90KV O d. 25.90KV Oe. 22.90KV O f. None of these
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