Standard for high-power loss measurement systems for testing power transformers

Mohns, E.; Rather, P.; Badura, Henrik; Schmidt, Matthias

doi:10.1109/amps.2016.7602858

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Recently, sampling techniques have reached maturity and offer a possible alternative to classical bridges [19][20][21]. In a sampling system, current shunts are used to convert the capacitive currents into a voltage that can be recorded by the sampling instruments as shown in Figure 3.…”

Section: Digital Methodsmentioning

confidence: 99%

Achievable Accuracy in Industrial Measurement of Dissipation Factor of Power Capacitors

Bergman

2018

NCSLI Measure

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Modern dielectrics used in power capacitors can exhibit a dissipation factor lower than 0.005 %, which approaches the limits of presently available measurement techniques. This article reviews techniques, apparatus, and available calibration services for dissipation factor with regard to lowest achievable uncertainties. It is shown that further metrological advances are necessary to lower uncertainty in the measurement to levels at least five times less than presently achievable, in order to ensure traceable and quality-assured measurement of modern dielectrics with such low dissipation factors.

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Section: Digital Methodsmentioning

confidence: 99%

Achievable Accuracy in Industrial Measurement of Dissipation Factor of Power Capacitors

Bergman

2018

NCSLI Measure

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“…To this end, the reference setup generates a test current with a stable and accurately known phase angle with respect to the applied high voltage. This can either be realized via parallel generation of the voltage and current test signals [22], or via a control loop that generates the current based on the measured phase of the applied high voltage, as depicted in Fig. 5 [12,14].…”

Section: Ivb Lms System Calibrationmentioning

confidence: 99%

Reliable Power Transformer Efficiency Tests

Rietveld

Houtzager

Hoogenboom

et al. 2020

Lecture Notes in Electrical Engineering

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Power transformer efficiency measurements are a crucial part of the acceptance tests of a power transformer. These tests have increased importance since the EU Ecodesign Directive per 1 July 2015 has put efficiency limits to power transformers that are sold on the European market. In this paper we present a series of measures to assure that power transformer efficiency tests performed by power transformer manufacturers are accurate and reliable. This includes the development of more accurate industrial loss measurement systems (LMS), optimized LMS calibration approaches, and a reference system for on-site LMS calibration.

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“…The advantage of this approach over a conventional voltage transformer is that it is much less bulky and thus more suitable for on-site measurements and moreover can achieve good phase uncertainties. Although the uncertainties of several reference set-ups for TLM system calibration were given in [4], [7]- [10], a detailed evaluation of the VD uncertainty in these setups is not presented so far. Recent work on accurate characterisation of voltage dividers 1 The manufacturers and instrumentation mentioned in this paper do not indicate any preference by the authors, nor do they indicate that these are the best available for the application discussed.…”

Section: Introductionmentioning

confidence: 99%

Verification of a Capacitive Voltage Divider With 6-μrad Uncertainty Up To 100 kV

Zhao

Rietveld

2021

IEEE Trans. Instrum. Meas.

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A reference setup for system calibration of industrial transformer loss measurement (TLM) systems consists of three main components, a voltage divider, current transformer and a power meter, and their phase displacements should each not be more than 10 µrad to achieve an overall system uncertainty of better than 20 µW/VA. We have extensively verified the uncertainty level of the current-comparator-based capacitive voltage divider (CVD) used in the TLM reference setup of the Van Swinden Laboratorium (VSL), both from the component level and the system as a whole. Different practical conditions relevant for on-site measurements are considered, e.g. measurement cable lengths, cable types and grounding. The verification measurement results show an agreement of better than (6 ± 6) × 10 −6 in ratio error and (4 ± 6) µrad in phase displacement between the CVD component and system calibrations up to 100 kV. Requirements for achieving this agreement are adequate grounding of the CVD and the use of triax cable between the HV capacitor and the CVD low-voltage electronics in case large distances have to be covered on-site. The (4 ± 6) µrad agreement in phase displacement is well within the required 10 µrad limit for voltage measurements as part of on-site TLM system calibrations with 20 µW/VA overall uncertainty at low power factors.

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Standard for high-power loss measurement systems for testing power transformers

Cited by 4 publications

References 3 publications

Achievable Accuracy in Industrial Measurement of Dissipation Factor of Power Capacitors

Achievable Accuracy in Industrial Measurement of Dissipation Factor of Power Capacitors

Reliable Power Transformer Efficiency Tests

Verification of a Capacitive Voltage Divider With 6-μrad Uncertainty Up To 100 kV

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