Instrument Transformer Test Set calibration using digital sampling

Franco, Ana Maria Ribeiro; Debatin, Rosane Moreira; Vitorio, P C O; Soares, Maurício A.; Lima, Vladimir Rodrigues de; Toth, E.

doi:10.1109/cpem.2012.6250916

Cited by 4 publications

(6 citation statements)

References 1 publication

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“…Specifically, the phase error variation for the range of −0.5 crad ~+1 crad was found to be less than ±0.0005 crad. The specification was calculated by the error equations with a 0.5% reading +0.001 crad for the phase as provided by the manufacturer [9]. The error bar shown in figure 10(b) indicates the measurement uncertainty obtained in table 6.…”

Section: Uncertainty Analysis and Discussionmentioning

confidence: 99%

“…Because we already know the capacitance values of C N , C X and C V , we can obtain the calculated value of the ratio error of positive polarity using equation (9). Therefore, we obtained the ratio error of both polarities by comparing the calculated values with the measured values.…”

Section: Ratio Error Calibrationmentioning

confidence: 99%

“…Research on the calibration of a CTTS is rare except for our previous study [4], although several papers for CT calibration and CT comparators exist [5][6][7][8]. Franco et al [9] developed a calibration method for a voltage transformer test set (VTTS) using digital sampling by employing two commercial voltmeters. They presented the preliminary calibration results of a VTTS in a limited error range up to 0.0030% for the ratio and 2´ for the phase.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of a current transformer test set calibrator and its applications

Lee

Jung

Kim

2015

Meas. Sci. Technol.

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A current transformer test set (CTTS) calibrator consisting of capacitors and resistors was fabricated. The calibrator was utilized for the calibration of several commercial CTTSs and covered a ratio error and phase error range up to ±10% and ±10 crad, respectively. From the calculated and measured values of the corresponding readings, the errors in the ratio and phase readings are derived. The calibration results for several commercial CTTSs are presented with the measurement uncertainty and are compared with the specifications provided by the manufacturer. The absolute uncertainty of a CTTS for both the ratio and the phase for the entire investigated range was obtained. The absolute uncertainty for the ratio error range of –0.1% to +0.05% was found to be less than 10 × 10−6 and the absolute uncertainty of the phase error range of –0.1 to +0.1 crad was not more than 6 µrad.

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Section: Uncertainty Analysis and Discussionmentioning

confidence: 99%

Section: Ratio Error Calibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication of a current transformer test set calibrator and its applications

Lee

Jung

Kim

2015

Meas. Sci. Technol.

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“…The standard error and standard digital protocol, which are the key standard parameters provided by a calibration device when calibrating the error measurement performance and digital channel performance of a ITTS, are the research focus of ITTS calibration technology. The standard error is achieved through the following schemes: 1) adjusted by signal sources and measured by auxiliary equipment [10], [11]; 2) adjusted by signal sources, voltage dividers or resistance-capacitance bridges [7], [12]- [15]; and 3) adjusted by program-based mathematical formulas [16], [17]. The standard digital protocol is achieved by 1) sampling with a digital multimeter or an A/D circuit [16], [17] or 2) utilizing a program-based protocol generator without sampling [10], [18].…”

Section: Introductionmentioning

confidence: 99%

Wide-Range Digital-Analog Mixed Calibration Technology of a DC Instrument Transformer Test Set

Nie²,

Xiong³

et al. 2021

IEEE Access

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A DC instrument transformer test set (ITTS), as an error measurement device for DC instrument transformers, needs to be calibrated regularly to ensure its accuracy. Existing calibration technology can only achieve DC ITTS error calibrations within a zero analog standard error. This paper proposes a wide-range digital-analog mixed calibration scheme for a DC ITTS based on multistage serial proportional micro-difference technology and high-speed high-precision sampling and coding technology, achieving a digital-analog standard error of ±1% that can be fine-tuned in 0.001% steps. A prototype is developed, and the prototype test results show that the expanded uncertainty of the prototype does not exceed 1×10 -4 , the maximum error of the standard error does not exceed ±3×10 -5 , and the output frequency of the digital protocol message is 4 kHz and 12.8 kHz. This scheme can achieve the error calibration of the analog and digital channels for the DC ITTS within a ±1% standard error and solve the error calibration problem of wide-range digital channels for DC ITTSs.

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“…Betts et al [5] presented the self-calibrating VTTS, which employs two inductive voltage dividers driven by the secondary of the standard VT (STD) to attain the balance inphase and in-quadrature components with the VT under test (TEST). Franco et al [6] described a method to calibrate an instrument transformer test set based on the method of digital sampling processing utilizing two voltage generators, two multimeters, two voltage dividers and a C language program together with measurement uncertainty.…”

Section: Introductionmentioning

confidence: 99%

Calibration of voltage transformer test set using an error simulator

Jung

Faisal

Lee

et al. 2015

Meas. Sci. Technol.

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A portable error simulator using a simple voltage divider consisting of a resistor and capacitor in series was developed. The error simulator was applied to the calibration of several commercial current-comparator-based voltage transformer test sets and covered the ratio error and phase errors with ranges up to about ±10% and ±14 crad, respectively. From the calculated and measured values of corresponding readings, the errors in the ratio and phase readings are derived with measurement uncertainty and compared with the accuracy provided by the manufacturer.

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Instrument Transformer Test Set calibration using digital sampling

Cited by 4 publications

References 1 publication

Fabrication of a current transformer test set calibrator and its applications

Fabrication of a current transformer test set calibrator and its applications

Wide-Range Digital-Analog Mixed Calibration Technology of a DC Instrument Transformer Test Set

Calibration of voltage transformer test set using an error simulator

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