A simple traceable current transformer calibration method

Corney, A.C.

doi:10.1109/cpem.2000.851184

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…These require two or more devices and usually bootstrap from simple calibrations of their 1/1 ratios to build up the calibrations of all the higher ratios in multiple steps. Examples of these approaches can be found in [2,4,10,18].…”

Section: Calibration Methods and Determination Of Uncertaintiesmentioning

confidence: 99%

“…These concepts will be developed more fully in subsequent chapters, and the quantities Z m and I m will be related to the underlying physics involved. 2) and combining (1.2) with (1.1) we get the transformer error as…”

Section: Transformer Error and Its Representationmentioning

confidence: 99%

“…Therefore, the measurement of the 1/1 ratio is indicative of the major error contributions at all ratios. In [2], Corney presents a formula to estimate the change in capacitive error when switching from the series to the parallel connection for transformers using a series-parallel primary configuration.…”

Section: Measuring the Test Transformer Burdenmentioning

confidence: 99%

“…These are typically rather difficult and tedious to perform, and require additional test devices and equipment. The simpler step-up procedures require two multi-ratio test devices with appropriate ratios, and intercomparison circuitry [2,10], while still relying on certain minimal assumptions. For example, in [10] the two test devices are compared using a simple current comparator having only three ratios (1/1, 2/2 and 2.5/1).…”

Section: Measuring the Test Transformer Burdenmentioning

confidence: 99%

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Transformer-like devices for high-accuracy AC current measurements

Souders¹

2004

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A theoretical and practical framework is presented to aid in the design, fabrication, and testing of transformer-like devices for use in high-accuracy ac current metering applications. Current transformers, two-stage current transformers, and current comparators are discussed, as well as related devices that use passive and active error correction techniques. Transformer theory is developed in terms of simple electromagnetic theory and practical equivalent circuits. Magnetic design equations are presented and the measurement of relevant magnetic properties is discussed. Sources of error and their mitigation are covered in detail, including errors caused by magnetizing currents, winding and core inhomogenieties (so-called magnetic errors), and circulating capacitive currents. Calibration methods and current transformer testing are also covered.

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Section: Calibration Methods and Determination Of Uncertaintiesmentioning

confidence: 99%

Section: Transformer Error and Its Representationmentioning

confidence: 99%

Section: Measuring the Test Transformer Burdenmentioning

confidence: 99%

Section: Measuring the Test Transformer Burdenmentioning

confidence: 99%

See 2 more Smart Citations

Transformer-like devices for high-accuracy AC current measurements

Souders¹

2004

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“…As the up level of the traceability system, the calibration of the calibrator should determine the measurement uncertainty of ratio error and phase error. The commonly used method to calibrate the traditional instrument transformer is the micro difference source [4], and the calibration of EIT tester followed this method, is to use a digital micro difference source, which adds a micro difference digital wave to the output data sequence to set the amplitude error and phase error, and compares them with the displayed values in EIT tester.…”

Section: Measurement Traceability System Of Eitmentioning

confidence: 99%

A Method for Measurement Traceability of Calibrator for Electronic Instrument Transformer Tester

Lei¹,

Guo²,

Zheng³

2014

AMM

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The bottleneck of the measurement traceability system of electronic instrument transformer is the calibrator, which is based on the digital micro-differential source principle and plays the role as intermediate between digital values in data frames and the analog output of the existing standard current transformer (CT) or voltage transformer (VT). A kind of working mechanism of the calibrator for electronic instrument transformer tester and related calibration method are proposed in this paper. The ratio accuracy can be calibrated by the high-precision multimeter and the phase accuracy can be calibrated by the high-speed oscilloscope, which records the waveforms of analog output and the synchronization signal, and the time offset between them can be traced to the time standard. A calibrator is designed and manufactured according to the mechanism and related experiments are conducted to verify the feasibility of the calibration method.

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Characterization of an arbitrary medium voltage signal generator

Faifer

Ottoboni

Toscani

et al. 2014

2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings

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Medium voltage transducers are calibrated by applying sinusoidal signals at their primary side and comparing the secondary output with that of a reference transducer. It is clear that this is a particular working condition that is often quite different from the actual one. In fact, voltage distortion in nowadays distribution networks can be not negligible. The measurement of these harmonic components is becoming more and more important, in particular for power quality monitoring. Therefore, the whole process of calibration should be reconsidered in order to take into account the behavior also under these operating conditions. A possible solution is to test the transducers by applying signals having a harmonic content similar to that which can be found in distribution networks. In order to perform such a kind of test an arbitrary medium voltage generator is required. This paper describes a voltage transducer testing setup based on a medium voltage generator proposed by the author in a recent paper. Moreover an evaluation of the generation accuracy is provided when the setup is used to test voltage transducers under realistic working conditions

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A simple traceable current transformer calibration method

Cited by 5 publications

References 6 publications

Transformer-like devices for high-accuracy AC current measurements

Transformer-like devices for high-accuracy AC current measurements

A Method for Measurement Traceability of Calibrator for Electronic Instrument Transformer Tester

Characterization of an arbitrary medium voltage signal generator

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