Conduction through sensing and inverter protection system
US4197575A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 25, 1978 |
| Grant date | Apr 8, 1980 |
| Priority date | — |
| Expiry date | Sep 25, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/525
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control or protection system for a line commutated inverter detects prescribed conduction-through faults and initiates a control sequence for recovery without shutting down the inverter. A conduction sensor in each leg provides a signal representing conduction and this is compared with a signal representing the forbidden interval when conduction should not occur in that leg. When conduction is detected in a forbidden interval it normally indicates a conduction-through fault and the gating pulses are advanced for at least the next two pulses to occur immediately but with a limit of 60.degree.. This causes commutation of the legs which are carrying the conduction-through fault current provided that sufficient volt-seconds remain in the alternating current part of the circuitry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.