Device for the protection of a converter which converts an impressed D-C current from a current source into an A-C current fed to a load

US4369492A · kind A · utility

Assignee

• Brown, Boveri & Cie AG · DE

Inventors

• Klaus Moll · Bischofswerda, DE
• Helmut Schulze · Großwallstadt, DE

Key dates

• Filing date: Mar 16, 1981
• Grant date: Jan 18, 1983
• Expiry date: Mar 16, 2001

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02H7/1225
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

The converter protection device has a number of controlled semiconductor elements. A control unit is connected to the semiconductor elements of the converter for forming firing pulses for the controlled semiconductor elements. Reference blocking intervals for the semiconductor elements are set and actual blocking intervals of the semiconductor elements are set and controlled. A comparator receives and compares the reference and actual blocking intervals. There are also provided a read-only memory for storing the reference blocking intervals, an event counter for counting disturbances detected by comparison of the reference and actual blocking intervals, a memory stage being connected to the event counter and being set if the event counter reaches a predetermined count, and a time-base device connected to the event counter and memory stage for resetting the event counter if the memory stage is not set at the end of a predetermined base time.