Travelling-wave based fault protection of high-voltage transmission lines
US9007733B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 2011 |
| Grant date | Apr 14, 2015 |
| Priority date | — |
| Expiry date | Nov 1, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/265
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved method of fault detection in a high-voltage direct current (HVDC) power transmission line is provided. The fault detection is based on fault-induced travelling waves. The method comprises estimating an amplitude of fault-induced travelling waves at the fault location, and calculating a fault resistance (Rf) based on the estimated amplitude, an estimated pre-fault voltage at the fault location, and a surge impedance of the transmission line. The estimated fault amplitude and the estimated pre-fault voltage are calculated from voltage measurements performed at both ends of the transmission line. Further, a fault detection device is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.