a) The Newmont Mining Company at Ahafo in the Bono region of Ghana requested a dedicated power supply line from Kumasi in the Ashanti region of Ghana to feed its mining roller mills. The World Bank helped the Government of Ghana to fund the project. A company won the bid and came up with the design specifications as follows: The system would be a three-phase 138-KV transmission line and the total power to be connected to the line is 49-MV and would be operating at a 0.85 lagging power factor due to the large rotating motors in the roller mills. The line constants would have length of 120km long line with Z = 95∟78ºΩ and Y = 0.001∟90ºS. They are proposing to use nominal -T circuit representation in their analysis. If they are to provide: (i) The A, B, C and D constants of the line. (ii) The voltage from Kumasi to the Newmont

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a) The Newmont Mining Company at Ahafo in the Bono region of Ghana requested a
dedicated power supply line from Kumasi in the Ashanti region of Ghana to feed its
mining roller mills. The World Bank helped the Government of Ghana to fund the
project. A company won the bid and came up with the design specifications as follows:
The system would be a three-phase 138-KV transmission line and the total power to be
connected to the line is 49-MV and would be operating at a 0.85 lagging power factor
due to the large rotating motors in the roller mills. The line constants would have length
of 120km long line with Z = 95∟78ºΩ and Y = 0.001∟90ºS.
They are proposing to use nominal -T circuit representation in their analysis. If they are
to provide:
(i) The A, B, C and D constants of the line.
(ii) The voltage from Kumasi to the Newmont
What are the values you think the company that won the bid would provide?


b) Using the information provided in a) above, Newmont Mining Company wants to know:
(i) The total current(I) they would be drawing from kumasi.
(ii) The power factor the system would be operating at from Kumasi.
(iii) The effectiveness of the transmission line design
What values from your understanding would the transmission line company provide to
Newmont Mining Company?


c) Two power system transmission engineers designed a transmission system. One used
the lumped parameters and the other used distributed parameters in their transmission
line analysis. Could you kindly evaluate the differences of these parameters chosen by
the two engineers?

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