|
Prepared by the North Dakota Legislative Council staff for the Electric
Industry Competition Committee |
SURGE IMPEDANCE LOADING
| Voltage | MW | New Estimate | |
| 1,000 | $1,200/mi | ||
| 500 | $1,000/mi | ||
|
$900/mi |
345 kV | 298 | $900/mi |
|
$700/mi |
230 kV | 132 | $700/mi |
|
$500/mi |
115 kV | 33 | $500/mi |
|
$300/mi |
69 kV | 12 | $250/mi |
|
$300/mi |
57 kV | 8 | $250/mi |
|
$125/mi |
41.6 kV | 4 | $125/mi |
The Square Butte DC line, operated by Minnesota Power, is rated at +/-250 kV DC and has a nominal power transfer capability of 500 MW. The CU DC line, operated by United Power Association, is rated +/-500 kV DC and has a nominal power transfer capability of 1,000 MW with a continuous overload rating of 1,100 MW. These two DC facilities are limited by the inverter and converter equipment located at each end of the DC lines.
