Comparison of Methods for the Dissipation Factor Measurement

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Abstract

Due to the mechanisms of the liberalised electricity market a change of the maintenance
strategy from time to condition based can be noticed. This is a reason why different
monitoring-, analysis- and diagnostic systems become a essential part in electric power
generation, transmission and distribution systems with the aim to increase the reliability
of the whole system.This means that the condition of electric power equipment has to be
observed. Normally the operator of power networks applies technical diagnostic tools
with respect to operational data. With the known condition, optimal maintenance
strategies can be applied, required inspections can be planned on a long-term basis and
the whole component lifespan can be utilised.
Monitoring und diagnostic systems provide an evaluation of the operational status like
insulation integrity and thermal ageing. For example partial discharge and thermal
ageing lead to a change of the physical, chemical and electrical properties of different
insulation materials which causes a variation of the dielectric parameters, such as the
dissipation factor.
Therefore, in the range of electric diagnostics the dissipation factor measurement plays
a major role. The classical method to determine the dissipation factor and the tanδ tip-up
is the Schering Bridge, which is an AC-balanced bridge circuit. Recently electronic
bridges were developed at which no balancing of the bridge is necessary. New
computer-based measuring systems operate according to the principle of a vectorial
impedance measurement in the frequency range by analysing the funtamental current
harmonic of the test object and the reference capacitance. A further possibility is to
calculate the dissipation factor from the results of a DC-current method by polarisation
and depolarisation of the test object. The time based measuring current is transformed
to the frequency based description by means of a fourier analysis.
In this paper the basics of these three measuring methods (Schering Bridge, unbalanced
Bridge and PDC Analyzer) were faced with respect to accuracy, sensitivity and
applicability. First a theoretical overview of the measurement methods and techniologies
is given, followed by practical measurements which should demonstrate the
performance of each single method and point out the advantages and disadvantages.
For a comparison of the different measuring techologies, the measurements have been
done on the same samples at the similar ambient conditions.
Originalspracheenglisch
TitelInformation technology and electrical engineering - devices and systems, materials and technologies for the future
ErscheinungsortIlmenau
Herausgeber (Verlag)ISLE
Seiten377-378
ISBN (Print)3-938843-15-2
PublikationsstatusVeröffentlicht - 2006
Veranstaltung51. Internationales Wissenschaftliches Kolloquium, Technische Universität Ilmenau - Ilmenau, Deutschland
Dauer: 11 Sept. 200615 Sept. 2006

Konferenz

Konferenz51. Internationales Wissenschaftliches Kolloquium, Technische Universität Ilmenau
Land/GebietDeutschland
OrtIlmenau
Zeitraum11/09/0615/09/06

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