Abstract
Different power-frequency positive-sequence parameter measurements for transmission lines are compared. The equivalent circuit of transmission line is analyzed theoretically according to its different lengths, its parameters are calculated based on the digital parameter measurement, and the frequency-related phase model is selected as the transmission line model. The simulation model is constructed based on PSCAD software platform and the simulative results for different power-frequency positive-sequence parameter measurements are compared. The positive-sequence impedance is calculated for two conditions: with and without the line-end current. The difference between calculated and theoretical values is analyzed and the conclusion is that: when the length of transmission line is shorter than 100 km, the value calculated only with the line-head voltage and current may meet the practical requirements; when the length is longer than 100 km, the line-end current should be acquired to get more accurate result.
| Original language | English |
|---|---|
| Pages (from-to) | 68-71 |
| Number of pages | 4 |
| Journal | Dianli Zidonghua Shebei / Electric Power Automation Equipment |
| Volume | 31 |
| Issue number | 2 |
| Publication status | Published - Feb 2011 |
| Externally published | Yes |
Keywords
- Error analysis
- Overhead transmission line
- PSCAD
- Phase model
- Power-frequency parameter measurement
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