Process for controlling a power supply which supplies power to an electrostatic filter in which secondary circuit states are determined based on measured primary circuit values and in which short circuits are detected

US5471377A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Gerhard Donig · Erlangen, DE
• Roland Humpfner · Herzogenaurach, DE
• Norbert Grass · Herzogenaurach, DE
• Hans-Joachim Knaak · Erlangen, DE
• Franz Neulinger · Langen (Hessen), DE
• Helmut Schummer · Heusenstamm, DE

Key dates

• Filing date: Dec 4, 1992
• Grant date: Nov 28, 1995
• Expiry date: Dec 4, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S323/903
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A filter short circuit is detected when the primary voltage of the high-voltage transformer drops below a specified minimum value and does not rise above the specified minimum value during a specified delay period and a filter current is greater than a specified minimum current. No current is drawn from the external current supply for a variable time delay when a filter short circuit is detected. A filter short circuit count is incremented when a filter short circuit is detected. When the count exceeds a specified, variable limit within a specified, variable time span, the indirect converter is disconnected.