Cable fatigue monitor and method thereof

US9134358B2 · kind B2 · utility

Assignee

• ABB RESEARCH LTD. · CH

Inventors

• Gang Wu · Zhejiang, CN
• Jens Hofschulte · Lehrte, DE
• Jingguo Ge · Shanghai, CN

Key dates

• Filing date: Nov 9, 2010
• Grant date: Sep 15, 2015
• Expiry date: Aug 17, 2031

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02G11/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A monitor for determining the operation condition of at least one cable that suffers bending and/or twisting and constitutes an electrical loop and a method thereof are provided. The monitor comprises a test electrical signal generator (5) for generating an identifiable test electrical signal and injecting the test electrical signal into the first point of the at least one cable, a test electrical signal filter (7) adapting to extract the injected test electrical signal from the second point of the at least one cable, and a comparator (8) for comparing a predetermined threshold with the difference between the electrical state of the injected test electrical signal and the extracted test electrical signal and producing a warning signal indicating cable fatigue when the difference exceeds the predetermined threshold. It provides the advantages as follows: it only monitors the electric performance, not the mechanical performance of a cable; it monitors the cable itself rather than a monitor material; it is applicable to all kinds of cables, including but not limited to a large-current cable; it does not introduce new cables; it is an on-line monitoring, i.e. the electro-mechanical sys…