2006.02.08 fault localization
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Introduction
Physics
Development
Schedule
Conclusion
Fault Localization in High Voltage Cable with
VLF Power SupplyMaster Thesis
Beat Schwaller
Telecommunications, Networks and Security
Department of Computer ScienceUniversity of Fribourgand PDTech AG Neuenhof
7.2.2006
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Introduction
Physics
Development
Schedule
Conclusion
Outline
1 Introduction
2 Physics
3 Development
4
Schedule
5 Conclusion
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Introduction
Physics
Development
Schedule
Conclusion
Topic
The goal of this master thesis is to produce a softwarebased portable (low cost) measurement instrument for
localizing weak spot of high power cable insulation.
Supported by PDTech AG
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Introduction
Physics
Development
Schedule
Conclusion
Motivation
Replacement of underground cables is expensive
Detecting weak spot in cable insulation allows local
reparation
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Physics
Development
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What is PD?
Partial discharges are caused by local irregularity/defect of
insulation material
The capacitance in such locations is much less than of the
surrounding insulation
Applying high voltage, partial discharges appear
Figure: Partial Discharge Pattern. Source: [1]
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Why VLF 0,1 Hz?
For field-test, the power supply should be portableA very low frequency (0,1Hz) power supply offers a
compact portable design of test equipment
Low power requirement I= U 2 f C
(500 times less power than a regular 50Hz power supply)
Beat Schwaller Fault Localization in High Voltage Cable with VLF Power Supply
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How to localize fault location?
Analyze the PD reflections against the velocity of
propagation of the signals and cable length
Figure: Reflectometry. Source: [1]
Beat Schwaller Fault Localization in High Voltage Cable with VLF Power Supply
Introduction
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Introduction
Physics
Development
Schedule
Conclusion
Workflow
Development of a base application (I/O handling,calibration, etc)
Module for manual fault location detection (prototype)
Module for automatic detection (signal analyzing)
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Physics
Development
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Conclusion
Development
Picoscope (USB Oscilloscope)
LabView 7.1 (Graphical programming language)
Coupling capacitors
VLF power supply
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Physics
Development
Schedule
Conclusion
Screenshot PD Analyzer
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Introduction
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Introduction
Physics
Development
Schedule
Conclusion
Schedule
first draft for a timeschedule
20.2. - 25.2. Testmeasurement in Ludwigshafen (AVISO)
3 weeks development of base application for manual
measurement
5 weeks development and implementation of automatic
signal detection
Testing and debugging
Documentation
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Physics
Development
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Conclusion
Conclusion
In a first draft, the system should detect weak spots in
cable insulation
Problems may arise when multiple discharges are detected
at the same time
The feasibility of detecting weak spots in a composite
cable system is not ensured
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Physics
Development
Schedule
Conclusion
Bibliography
[1] M. de Nigris; G. Rizzi, et al. : CABLEDIAGNOSIS BASED ON DEFECT LOCATION
AND CHARACTERIZATION THROUGH PARTIAL
DISCHARGE MEASUREMENTS, Cesi (Cigre
15-109 session 2002).
Beat Schwaller Fault Localization in High Voltage Cable with VLF Power Supply
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