Reach-measurement method for distance relays and fault locators on series-compensated transmission lines using local information
US6336059B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1998 |
| Grant date | Jan 1, 2002 |
| Priority date | — |
| Expiry date | Nov 17, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A reach-measurement method is used in connection with a series-compensated line of a power system. The series-compensated line includes an installed series capacitance having a bus side and a line side, and a non-linear protection device parallel to the installed series capacitance. The series-compensated line has a line current, a bus side voltage, and a line side voltage. The series capacitance and the non-linear protection device have a capacitance voltage thereacross equal to the bus side voltage minus the line side voltage. In the method, a number (n) of line current samples are measured, where such samples are representative of values of a line current waveform at successive instants of time on the series-compensated line. Capacitance voltage values are computed based on the measured line current samples in accordance with an equation which takes into account the non-linear protection device parallel to the installed series capacitance. A prescribed power system function is then performed based on the computed capacitance voltage values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.