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Unformatted text preview: winding. 2. A 400-kV transmission line has a hot-weather power rating of 1400 MVA. If the transmission line is operating in cold weather, it is rated for 2200 MVA (at 400 kV). The transmission line is under cold weather conditions, and the operating voltage is 390 kV. What is the per-unit value of line-to-line voltage and phase voltage with the operating voltage of 390 kV? What is the per-unit rated cold-weather power if the hot-weather rating is considered to be 1 p.u.? 3. A generator with a (source) reactance of 0.2 p.u. has a rating of 11.8 kV and 200 MVA. It is to be connected into a system which has been modeled with a base voltage of 11.0 kV and base power of 100 MVA. What per-unit value of reactance should be used when the generator is added to the system model?...
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- Spring '10
- Electrical Engineering