Method and device for the electrical monitoring of an electrode lead of a bipolar high-voltage D.C. transmission system

US6518769B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Jörg Ammon · Erlangen, DE
• Gerhard Plewka · Baiersdorf, DE
• Gerhard Schaller · Augsburg, DE

Key dates

• Filing date: Feb 9, 2001
• Grant date: Feb 11, 2003
• Expiry date: Feb 9, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R27/18
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

To monitor an electrode lead composed of two lines in a bipolar HVDCT system, a balanced-to-ground pulse formed from an unbalanced-to-ground pulse in push/pull mode is fed into the lines and an actual echo curve is recorded from the echo signals and compared to a dynamic target echo curve, a fault signal being generated when a tolerance band placed around the echo difference curve is exceeded. In this way, a monitoring method is achieved which is nearly independent of the sharply fluctuating ground conductance, which has a higher range with simultaneously lower dispersion of the echo, which radiates less electromagnetic energy and which requires no additional decoupling elements.