Coupling unit for the operative monitoring of the high-voltage wingings and the connected output leads in electric high-voltage machines and apparatus, by means of partial discharge determination and breakdown spark measurement

US4779051A · kind A · utility

Assignee

• Kraftwerk Union Aktiengesellschaft · DE

Inventors

• Peter Grunewald · Bocholt, DE
• Reinhold Koziel · Neheim, DE

Key dates

• Filing date: Feb 13, 1987
• Grant date: Oct 18, 1988
• Expiry date: Feb 13, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/343
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

Coupling unit for the operational monitoring of the high-voltage winding (SW) and the connected electric output lines in electric high-voltage machines and apparatus, particularly of three-phase stator windings in turbo-generators including their generator output lines (5.1, 5.2, 5.3) and/or in transformers and converters by means of determining partial discharges and measurement of the breaking spark in the high-frequency range, where the above-mentioned machines and apparatus are connected via generator output leads or other connecting line to each other and are connected to ground potential via network protection capacitors. The respective coupling unit (AE1, AE2, AE3) is coupled to one each of the three legs (5.1, 5.2, 5.3) of the generator output lead (5), and the network protection capacitor (C.sub.1, C.sub.2, C.sub.3) of each phase are connected to ground potential (B) via a measuring impedance. Furthermore, the shielded measuring lines (4.1, 4.2, 4.3) brought from the measuring voltage terminal of the measuring impedance to the partial discharge measuring device, are conducted through a filter.