Method and device for power system protection
US6501631B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 2000 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Apr 14, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for protecting a zone in a power system, which has a number of transmission lines connected to power sources and a number of transmission lines connected to a number of loads, where the power sources and the loads are arranged outside the zone. Continuously measuring all the incoming currents (Iin) to the zone, continuously measuring all the outgoing currents (Iout) from the zone, and continuously calculating the differential current (Id) according toId=Iin−Iout.Continuously integrating Iin, Iout and Id according to wherein T is the fundamental frequency cycle. Changes of the continuously integrated values Iin, IOUT and Id are indications of whether faults in the power system occur within or outside a zone. A computer program implements performance of the method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.