An Efficient Digitizer for Calibration of Instrument Transformers

George, Noby; Ooka, Prashanth V; Gopalakrishna, Shrihari

doi:10.1109/amps.2018.8494842

Cited by 5 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A large number of advanced approaches are complemented by digitization during calibration of IT as an alternative to complex methods of balancing the alternating current or measurement data acquisition systems. It increases the accuracy of the measurement of RE and PD because the conversion process delivers digital outputs of RE and PD of the test transformer directly [13].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Comparator effect on equivalence of results of calibrating current transformers

Isaiev¹,

Velychko²,

Anokhin³

2019

EEJET

View full text Add to dashboard Cite

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

show abstract

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Comparator effect on equivalence of results of calibrating current transformers

Isaiev¹,

Velychko²,

Anokhin³

2019

EEJET

View full text Add to dashboard Cite

show abstract

“…Other methods to determine the accuracy of tested CTs are based on measuring systems using the Rogowski coil or the current transducer made with flux-gate technology [15,25,26]. These systems may use the transducer with a digital signal proportional to the current error and phase displacement [27]. Such devices use a dual-band A/D converter and keep the accuracy over a wide frequency range.…”

Section: Introductionmentioning

confidence: 99%

The Method to Determine the Turns Ratio Correction of the Inductive Current Transformer

Stano

2021

Energies

View full text Add to dashboard Cite

This paper presents the method for evaluation of the turns ratio correction of the inductive current transformer using the magnetization curves determined at the non-load state and in the load conditions. The presented method may be applied to determine even a fractional winding correction factor. The standard IEC 61869-2 provides the method to determine the turns ratio correction of the tested CT from the measured rms values of voltages on its primary and secondary winding in the non-load state. However, this approach is limited in determining the significant changes in the number of turns of the secondary winding. Moreover, the paper presents the influence of the applied turns ratio correction on the frequency characteristics of the current error and phase displacement of the inductive current transformers evaluated for the transformation of the distorted current.

show abstract

“…The expanded uncertainty, declared by the developer, does not exceed 5 µA/A in magnitude and 5 µrad in phase [7]. The researchers have also offered alternative approaches to determining the metrological characteristics of instrument transformers, such as the application of a quasi-balance technique using the virtual instrument [8], or low cost efficient digitiser [9], or a method based on the low-voltage reciprocity principle [10], or a calculation of the errors based on the excitation table [11].…”

Section: Introductionmentioning

confidence: 99%

Metrological characterisation of current transformers calibration unit for accurate measurement

Isaiev

Velychko

2021

ACTA IMEKO

View full text Add to dashboard Cite

<p class="Abstract"><span lang="EN-US">The manuscript presents a method for the metrological characterisation of the commercial AC comparators used to calibrate current transformers. The theoretical basis for simulating the difference between two almost identical currents has been outlined, as well as the mathematical models for both a ratio error and a phase displacement has been derived. The measurement setup, consisting of conventional measuring instruments, has been described with a detailed presentation of its parameters. The sources of uncertainty have been distinguished and analysed with determining the current phase shift which led to a significant increase of relative measurement uncertainty. The simulation of measurement results was yielded in two ways: physically using a method presented and virtually using a Monte Carlo method. The second method confirmed that evaluating the measurement uncertainty through derived sensitivity coefficients is correct enough. The simulation results in the range from 1 to 1200 parts per million for both ratio error and phase displacement motivated the use of a comparator characterised through the proposed method for accurate measurement, especially for very low errors.</span></p>

show abstract

An Efficient Digitizer for Calibration of Instrument Transformers

Cited by 5 publications

References 15 publications

Comparator effect on equivalence of results of calibrating current transformers

Comparator effect on equivalence of results of calibrating current transformers

The Method to Determine the Turns Ratio Correction of the Inductive Current Transformer

Metrological characterisation of current transformers calibration unit for accurate measurement

Contact Info

Product

Resources

About