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
Short Transmission Line
A short transmission line is a transmission line that has a length less than 80 kilometers, an operating voltage level of less than 20 kV, and zero capacitance effect.
Power Flow Analysis
Power flow analysis is a topic in power engineering. It is the flow of electric power in a system. The power flow analysis is preliminary used for the various components of Alternating Current (AC) power, such as the voltage, current, real power, reactive power, and voltage angles under given load conditions and is often known as a load flow study or load flow analysis.
Complex Form
A power system is defined as the connection or network of the various components that convert the non-electrical energy into the electric form and supply the electric form of energy from the source to the load. The power system is an important parameter in power engineering and the electrical engineering profession. The powers in the power system are primarily categorized into two types- active power and reactive power.
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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