System for checking synchronization of AC voltage sources before closing a power circuit breaker
US7230809B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 21, 2004 |
| Grant date | Jun 12, 2007 |
| Priority date | — |
| Expiry date | Feb 3, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J3/42
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system for checking synchronization of AC voltage sources before closing a power circuit breaker is provided comprising two power circuit breakers connected by a power transmission line, such as by using remote voltage via fiber channel. Each circuit breaker is respectively connected to a bus and a protective relay. The circuit also comprises voltage transformers between the bus and the protective relay. The protective relays monitor the voltages on the bus side of the circuit breakers and current flowing through the circuit breakers in order to detect short circuits on the line. A bidirectional communications link is further provided for connecting protective relays together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.