Achievable Accuracy in Industrial Measurement of Dissipation Factor of Power Capacitors

Bergman, Anders

doi:10.1080/19315775.2017.1335585

Cited by 2 publications

(1 citation statement)

References 16 publications

(19 reference statements)

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“…In an aside it can be noted that reference for loss at high voltage refers back to loss factor of compressed gas capacitors, and that their performance is adequate for loss of transformers but can be just about sufficient for large reactors [7].…”

Section: Introductionmentioning

confidence: 99%

Estimating Uncertainty in Loss Measurement of Power Transformers

Bergman

Jönsson²,

Rietveld

et al. 2019

Lecture Notes in Electrical Engineering

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The Eco-design directive issued by the European Commission has led to requirements on efficiency of power transformers. In the case of large power transformers used in grid applications, serious problems are encountered in establishing how reliable the loss measurements are. An effort is currently ongoing within IEC to produce a documentary standard on "Rules for the determination of uncertainties in the measurement of the losses of power transformers". An IEC standard should be clear and easy to understand by all users in the industry. Background theory and material, whilst necessary for understanding, is not required for the day-today application of the standard. This paper presents a more detailed background and theory on the measurement of transformer losses and how to quantify precision. The authors are all members of the IEC maintenance team working with the standard.

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Section: Introductionmentioning

confidence: 99%

Estimating Uncertainty in Loss Measurement of Power Transformers

Bergman

Jönsson²,

Rietveld

et al. 2019

Lecture Notes in Electrical Engineering

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Measurement of Dissipation Factor of Inner Layers of Insulation in Three-Core Belted Cables

Kostiukov

2021

LEPE

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This paper presents a substantiation of an approach for direct measurements of dielectric dissipation factor of layers of insulation between the conductors of three-core power cables. Proposed approach is based on grounding of the inspecteddielectric layer through the sufficiently low electrical resistance. The results of carried out analysis, which was carried out taking into consideration the presence of numerous parasitic parameters of tested layer of insulation due to the capacitive coupling between the electrically conductive elements of three-core power cable, have shown that for the case of sufficiently low value of used resistor the value of phase shift between the waveforms of voltage drop on inspected layer of insulation and resistor, through which this layer of insulation is grounded, coincides with the value of phase shift between the sine waveforms of current and voltage for parallel equivalent scheme of tested layer of insulation with power losses. Because of the dependence of dielectric power loss angle on the value of phase shift between sine curves of current and voltage, the presented approach for the measurement of dielectric dissipation factor is based on such coincidence of values of phase shift. Depending on the value of applied resistor, the value of dissipation factor is calculated on the basis of measured value of phase shift between the voltage drop on the electrical resistor, through which tested layer of insulation is grounded, and either the waveform of voltage dropon the inspected layer of insulation, or the waveform of applied voltage. Factors that affect the accuracy of measurement are discussed, equivalent schemes of tested three core power cable for various ways of applying testing voltage are presented and theexample of practical implementation of presented approach for dissipation factor measurement is also given. Further development of presented approach for dissipation factor measurement is supposed to include the comparative analysis of the results of its practical implementation with the results obtained by applying previously developed techniques based on aggregate measurements.

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Achievable Accuracy in Industrial Measurement of Dissipation Factor of Power Capacitors

Cited by 2 publications

References 16 publications

Estimating Uncertainty in Loss Measurement of Power Transformers

Estimating Uncertainty in Loss Measurement of Power Transformers

Measurement of Dissipation Factor of Inner Layers of Insulation in Three-Core Belted Cables

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