NDLI: Ultrasonic and Nuclear Magnetic Resonance for non-destructive diagnostics of cable systems

Content Provider	IEEE Xplore Digital Library
Author	Cornelissen, C. Wiesmath, A. Schnettler, A. Blumich, B.
Copyright Year	2003
Description	Author affiliation: Inst. For High Voltage Technol., Aachen Univ., Germany (Cornelissen, C.)
Abstract	Due to mechanical, thermal and electrical stress non-reversible damages of the morphological texture can occur in polymeric materials used in cable systems (mainly polyethylene and silicone rubber). Reasons for the preceding damaging are for example included gas-filled microvoids and local inhomogeneities of the cross-linking-density. Considering the consequences of these processes, effective diagnostic methods are currently required, which have to fulfill certain demands (for example non-destructivity). Investigations carried out so far have shown that Ultrasonic and Nuclear Magnetic Resonance (NMR) meet these requirements. Ultrasonic diagnosis rest on the observation of the sound-propagation in materials. NMR is based on the recording of spin-dependent relaxation processes and its characteristics. Both diagnostic methods are well-known in materials science, whereas their use for monitoring equipment of cable systems has to be further developed. Therefore the current investigations focus on the detection, localization and characterization of defects. The analysis regarding the influence of mechanical stress (expansion of joints) shows a non-reversibility of this impact. Furthermore investigations relating to ageing phenomena are depicted. In addition first examinations using an automated ultrasonic measuring device, which has been developed with regard to industrial appliance, confirm the assumption of the ability to detect even small failures in insulation materials.
Sponsorship	IEEE Dielectrics & Electrical Insulation Soc. IEE Japan
Starting Page	88
Ending Page	91
File Size	325838
Page Count	4
File Format	PDF
ISBN	0780377257
ISSN	10817735
DOI	10.1109/ICPADM.2003.1218359
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-06-01
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Nuclear magnetic resonance Thermal stresses Magnetic materials Polymers Mechanical cables Polyethylene Rubber Acoustic materials Magnetic recording Materials science and technology
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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