An AC Current Transformer Standard Measuring System for Power Frequencies

Mohns, E.; Roeissle, G.; Fricke, S.; Pauling, F.

doi:10.1109/tim.2017.2648918

Cited by 35 publications

(17 citation statements)

References 8 publications

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“…The current sources, standards, burdens, comparators, connecting conductors in the complement of the calibration systems are the sources of uncertainty too. One of the smallest sources of uncertainty is the device for comparing currents, for example, the contribution of the PTB bridge has a level of several hundredths of μA/A [4]. One of the methods for verification of the accuracy of AC comparators is a method for determining the reference values of RE and PD using the oscilloscope allowing metrological support of the comparators exploited [16].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…In the above investigations, the results obtained with the help of precision measuring instruments (often sophisticated complexes of technical means) are compared. An example of such a complex system is the alternating current transformer standard measuring system developed by PTB (Germany), which allows defining RE with an uncertainty of about 1 μA/A [4]. But the assurance of high accuracy of the complex measuring system requires highly skilled scientific and technical personnel, as well as considerable funds for the purchase and maintenance of equipment.…”

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confidence: 99%

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Comparator effect on equivalence of results of calibrating current transformers

Isaiev¹,

Velychko²,

Anokhin³

2019

EEJET

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The importance of the accuracy level of ITs is discussed in developing a medium voltage signal generator for testing voltage measuring transducers for the study of the quality of electricity [2]. An accuracy of ITs is also important when testing power transformers in part of the dynamic effects of a short circuit with the help of the method for accurate measurement [3]. It is difficult to count all cases 1. Introduction One of the important branches of the economy of each technically developed state is the energy sector. In the electric power industry, such technical means as instrument transformers (IT) have become very widespread. Such scaling transducers are used in solving measurement-related tasks, and the accuracy of such devices should

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

mentioning

confidence: 99%

Comparator effect on equivalence of results of calibrating current transformers

Isaiev¹,

Velychko²,

Anokhin³

2019

EEJET

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“…Power Quality (PQ) measurement instruments, Phasor Measurement Units (PMUs) and all metering and protection instruments installed in the distribution and transmission grids require the measurement of grid voltage and current [1]. Since in transmission and distribution grid amplitude these quantities span from hundreds of volt and tens of ampere up to hundreds of kilovolt and tens of kiloampere, transducers have to be introduced in the measurement chain in order to reduce the signals to be acquired to the input levels of the installed measurement instruments.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Dynamic Voltage Variation Effect on Instrument Transformers for Power Grid Applications

Crotti

Giordano

D’Avanzo

et al. 2020

2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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Within the framework of distribution and transmission grids, knowledge of Instrument Transformers (ITs) behavior in distorted conditions is a topics of great interest. Its relevance stems from the ITs wide use in metering, protection, monitoring and control applications, where their role is to reduce voltage and current to levels compatible with measuring instruments input. In force standards require that the performance of measuring instruments is assessed under realistic conditions. On the contrary, performance test of ITs are generally carried out only at rated conditions, so that their behavior under actual waveforms is not fully known. To cover this gap and starting from the hardware used for the Medium Voltage (MV) Voltage Transformer (VT) frequency characterization, a suitable setup is developed for the traceable test of VTs under a quite large set of static and time varying test waveforms. In the paper, after a short description of the setup, examples of its applications to the evaluation of the performances of ITs under different test voltage waveforms are given, including a realistic reproduction of a PQ event and focusing on the amplitude and phase modulation tests, as those suggested for the Phasor Measurement Units in IEEE Std. C37.118.1. Preliminary experimental results are shown.

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“…They are used for state monitoring of high voltage transmission line [2] appliances, load monitoring applications for smart home and industries [3,4,5,6,7,8], smart metering applications [9] and for condition monitoring and recording of electrical rotating machines [10]. Established methods are available for non-invasive current measurement for direct current (DC) and alternating current (AC) applications such as Hall effect current sensors [11] and current transformers [12,13,14,15] with a high degree of accuracy. There are few non-invasive AC measurement schemes using capacitive coupling-based measurement of transmission line voltage [16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Low Power Contactless Voltage Sensor for Low Voltage Power Systems

Femine

Gallo

Landi

et al. 2019

Sensors

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Contactless measurements represent the desirable solution in many contexts, where minimal cabling is required or, in general, cabling is not possible. This paper presents a new contactless voltage sensor for low voltage power systems. It is based on a contactless capacitive probe, which surrounds the power cable. It has two concentric electrodes insulated by a shield. A low power analog conditioning circuit evaluates the power line voltage by measuring the current in one of the capacitances of the probe. All the single stages of the circuit have been designed by using low-power rail-to-rail operational amplifiers, supplied at 3.3 V, in order to minimize the power absorption. The sensor has been characterized in various conditions, with sine waves and distorted signals, varying the frequency and the harmonic distortion. The influence of the current, flowing into the power cable, on the voltage measurement has been evaluated too. It shows a good accuracy (lower than 0.3%) from 100 V to 300 V, with a power consumption less than 5 mW.

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An AC Current Transformer Standard Measuring System for Power Frequencies

Cited by 35 publications

References 8 publications

Comparator effect on equivalence of results of calibrating current transformers

Comparator effect on equivalence of results of calibrating current transformers

Measurement of Dynamic Voltage Variation Effect on Instrument Transformers for Power Grid Applications

Low Power Contactless Voltage Sensor for Low Voltage Power Systems

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