Question

(Three-phase problem) An electric mining shovel is supplied by a 13.8 kV, 3$\phi$ source. The motor is rated at 3 MW with power factor 0.9 lagging. Because the shovel is operating in a remote mine, the power company must install 20 miles of 3-phase service, with installation costs as given below. All electrical requirements at the location are negligible compared to the electric shovel. Which of the following solutions would work? Which should be chosen? Show your work and explain your reasoning | Line | Installation cost per mile in millions of dollars | Current capacity, A | |---|---|---| | A | $0.6 M | 100 | | B | $0.8 M | 300 | | C | $1.5 M | 700 |

          (Three-phase problem) An electric mining shovel is supplied by a 13.8 kV, 3$\phi$ source.
The motor is rated at 3 MW with power factor 0.9 lagging. Because the shovel is
operating in a remote mine, the power company must install 20 miles of 3-phase service,
with installation costs as given below. All electrical requirements at the location are
negligible compared to the electric shovel. Which of the following solutions would work?
Which should be chosen? Show your work and explain your reasoning

| Line | Installation cost per mile in millions of dollars | Current capacity, A |
|---|---|---|
| A | $0.6 M | 100 |
| B | $0.8 M | 300 |
| C | $1.5 M | 700 |

three phase problem an electric mining shovel is supplied by a 138 kv 3phi source the motor is rated at 3 mw with power factor 09 lagging because the shovel is operating in a remote mine the 75647

Added by Tracy V.

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