Ultraschalldiagnostik als neues Verfahren zur Zustandsbewertung elastomerer Isolierstoffe in Energiekabelsystemen
type: CreativeWork
description: Ultrasonic diagnosis is analysed as a method for condition assessment of elastomeric insulating materials for power cable accessories. It is possible to identify the most critical effects regarding a potential lowering of the insulation behaviour. In this context the basic demands on ultrasonic diagnosis for an use of condition assessment are defined and - especially regarding a possible industrial use - verified. As an important part of this project a measuring setup to conduct experiments in contact- and immersing-technique is built up. Using a micropositioning system it is possible to move the ultrasonic transceiver to any position of the sample's surface. By the development of an automation software, a scanning of the sample's surface with a minimal step increment of 50 micrometres can be realised. Furthermore there is a possibility to examine large (industrial) objects such as high voltage joints in an additional measuring device. The detection of ultrasonic signals, which are reflected by included failures like voids, depends on a large number of parameters like the size and depth of the fault, the type of the transceiver and so on. These influences are first discussed theoretically and afterwards analysed and verified in various experimental researches. Thereby the measurement resolution of the used setup is determined. For example, voids of 100 micrometres are detectable in a depth of nearly 30 millimetres, what is very interesting regarding an industrial use. A main topic of the project is the analysis of singular inhomogenities such as gas-filled microvoids. They can be detected and localised in a detailed scan process of the sample's surface. Software tools for handling the large amount of measured data are developed and so an automated evaluation of the signals regarding their amplitude, width and quantity is feasible. Furthermore the received results are used for image processing to detect existing objects in the scan. Details regarding the object's dim…
abstract: Ultrasonic diagnosis is analysed as a method for condition assessment of elastomeric insulating materials for power cable accessories. It is possible to identify the most critical effects regarding a potential lowering of the insulation behaviour. In this context the basic demands on ultrasonic diagnosis for an use of condition assessment are defined and - especially regarding a possible industrial use - verified. As an important part of this project a measuring setup to conduct experiments in contact- and immersing-technique is built up. Using a micropositioning system it is possible to move the ultrasonic transceiver to any position of the sample's surface. By the development of an automation software, a scanning of the sample's surface with a minimal step increment of 50 micrometres can be realised. Furthermore there is a possibility to examine large (industrial) objects such as high voltage joints in an additional measuring device. The detection of ultrasonic signals, which are reflected by included failures like voids, depends on a large number of parameters like the size and depth of the fault, the type of the transceiver and so on. These influences are first discussed theoretically and afterwards analysed and verified in various experimental researches. Thereby the measurement resolution of the used setup is determined. For example, voids of 100 micrometres are detectable in a depth of nearly 30 millimetres, what is very interesting regarding an industrial use. A main topic of the project is the analysis of singular inhomogenities such as gas-filled microvoids. They can be detected and localised in a detailed scan process of the sample's surface. Software tools for handling the large amount of measured data are developed and so an automated evaluation of the signals regarding their amplitude, width and quantity is feasible. Furthermore the received results are used for image processing to detect existing objects in the scan. Details regarding the object's dim…
author: Cornelissen, Christian
language: ger
keywords: info:eu-repo/classification/ddc/620, Ingenieurwissenschaften, Ultraschall, Zustandsbewertung, Energiekabel, Garnituren
date published: 2003
date modified: 2026-07-30T19:43:19Z
provider: RWTH Aachen University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Publikationsserver der RWTH Aachen University