Method of locating a fault in a predetermined monitoring region of a multiphase electric power transmission system
US5929642A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1997 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Nov 19, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/088
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for locating a fault in an electric power transmission line to form measured precursor fault vector values of two aerial modes from sample values from currents and voltages stored immediately before and during an occurrence of the fault, using the Clarke transformation. For synchronization, the phase angle is determined from these measured vector values, so that fault vector voltage values of both aerial modes can be generated without distortion by asynchronously forming the sample values. The fault vector voltage values of one aerial mode are subtracted from those of the other aerial mode, and the resulting differences are squared. The location of the fault is determined by estimating the minimum value of the sum of the squared differences.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.