Calibration systems for analogue non-conventional voltage and current transducers

Houtzager, E.; Mohns, E.; Fricke, S.; Ayhan, B.; Kefeli, T.; Çaycı, H.

doi:10.1109/cpem.2016.7540488

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…Control requirements for protection are in conflict with those required to achieve FRT capability. TWs-based protection [64][65][66][67][68][69][70][71][72][73] Fault on feeder generates TWs. Current waveforms captured and analysed in the relay.…”

Section: Optimal Protection Relay Coordinationmentioning

confidence: 99%

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Review of technical issues influencing the decoupling of DG converter design from the distribution system protection strategy

Manditereza

Bansal

2018

IET Renewable Power Generation

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Several issues need to be considered in the design and control of converters for converter-interfaced distributed generators (DGs). Under fault conditions, the semiconductor devices withstand ratings must not be exceeded. The converter control strategy is also required to facilitate fault ride through (FRT) capability. On the other hand, protection against fault is better served by employing control strategies that allow the converter-interfaced DGs to contribute short duration fault current sufficient to aid the detection of faults. Semiconductor devices protection and FRT capability have the same objective of limiting the magnitude of the fault current. Protection coordination in the complex DG-integrated network is difficult and may result in protection settings that are not optimal or contribute to long relay operating times that may impact FRT support. On this basis, this study proposes the de-coupling of the protection solution from FRT and semiconductor device considerations. This study critically reviews various strategies proposed in the literature for the protection of the DG-integrated distribution system and develops an argument that aims to influence a paradigm shift towards voltage-based protection that may see protection design decoupled from inverter design and control, since fault current contribution may not be required to achieve effective protection.

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Section: Optimal Protection Relay Coordinationmentioning

confidence: 99%

“…Research on the development of non-conventional instrument transformers (NCITs) is on-going and some manufacturers are already offering power equipment with built-in NCITs [72]. These NCITs use new measurement techniques such as optical CTs and VTs.…”

Section: Tw-based Protectionmentioning

confidence: 99%

Review of technical issues influencing the decoupling of DG converter design from the distribution system protection strategy

Manditereza

Bansal

2018

IET Renewable Power Generation

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“…However, there are issues in special applications not yet addressed in scientific literature, such as the measurement of the phase angles timestamped against the absolute timeused, for example, for Phasor Measurement Unit (PMU) -in medium voltage grid application (Braun et al, 2016;Georgakopoulos and Quigg, 2017;Luiso et al, 2018;Sa´nchez-Ayala et al, 2013;Tang et al, 2013), or as the phase difference measurement with accuracy of the microradian; necessary, for example, for the calibration of Low Power Instrument Transformers (LPIT) with digital output (DLPIT) or Stand Alone Merging Units (SAMU) (Collin et al, 2018;Crotti et al, 2018aCrotti et al, , 2018bDel Prete et al, 2018;Djokic and So, 2005;Houtzager et al, 2016;Juvik, 2000;Mohns et al, 2017), carried out by comparison with a reference device with analog output -where the absolute phase deviation of the single channel of the used digitizer may be comparable or higher than the required accuracy.…”

Section: Introductionmentioning

confidence: 99%

“…Anyway, the issues related with measurement of the relative phase delay between two channels of the same digitizer, or two channels of two different digitizers with synchronized sampling clocks, is faced in a number of scientific papers (Bosco et al, 2011;Trinchera, Serazio and Pogliano, 2017;Crotti et al, 2017). However, there are issues in special applications, not yet addressed in scientific literature, as the measurement of the phase angles timestamped against the absolute time -used for example for Phasor Measurement Unit (PMU) -in medium voltage grid application (Sánchez-Ayala et al, 2013;Braun, Mester and André, 2016;Tang, Stenbakken and Goldstein, 2013;Georgakopoulos and Quigg, 2017;Luiso et al, 2018) or as the phase difference measurement with accuracy of the microradian -necessary for example for the calibration of Low Power Instrument Transformers (LPIT) with digital output (DLPIT) or Stand Alone Merging Units (SAMU) (Djokic and So, 2005;Juvik, 2000;Collin et al, 2018;Crotti et al, 2018;Crotti, Delle Femine et al, 2018;Mohns et al, 2017;Houtzager et al, 2016;Del Prete et al, 2018), carried out by comparison with a reference device with analog output -where the absolute phase deviation of the single channel of the used digitizer may be comparable or higher than the required accuracy. In (Crotti et al, 2019) the same authors presented a measurement procedure for the evaluation of the absolute phase errors of a digitizer, with an experimental validation.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty evaluation on the absolute phase error of digitizers

Femine

Gallo

Landi

et al. 2019

Transactions of the Institute of Measurement and Control

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In many engineering applications the phase angle of a signal is a key parameter. Especially when measuring small angles, the measurement accuracy is of a vital importance. Often, the absolute phase error of a digitizer, which is defined as the phase displacement between the digitized output and the input analog waveform and which represents a systematic measurement error, is neglected. Therefore, in this paper, a new measurement technique for the evaluation of this absolute phase error is discussed, along with a deep theoretical analysis on the uncertainty sources and how to handle them. The measurement technique is validated through a high accuracy experimental setup. Experimental tests demonstrate that even high accuracy digitizers can show non-linear behavior in the absolute phase errors.

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Measurement of the Absolute Phase Error of Digitizers

Crotti

Femine

Gallo

et al. 2019

IEEE Trans. Instrum. Meas.

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This paper proposes a method for the measure-1 ment of digitizer absolute phase errors, defined as the phase 2 displacement between the digitized output and the input analog 3 waveform. The measurement procedure is based on the use of a 4 phase reference signal (PRS), which is theoretically synchronous 5 with the input analog waveform and that triggers the digitizer 6 sampling clock. From the characterization of the waveform 7 generator phase response and the measurement of the time 8 delay of the digitizer sampling clock with respect to the PRS, 9 an accurate evaluation of the digitizer absolute phase error is 10 obtained. The method has been applied to a high-performance 11 digitizer, measuring the absolute phase errors of two different 12 channels. The expanded uncertainty of the method has been 13 quantified as a few microradians at 50 Hz and 150 µrad 14 at 20 kHz.

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Calibration systems for analogue non-conventional voltage and current transducers

Cited by 3 publications

References 3 publications

Review of technical issues influencing the decoupling of DG converter design from the distribution system protection strategy

Review of technical issues influencing the decoupling of DG converter design from the distribution system protection strategy

Uncertainty evaluation on the absolute phase error of digitizers

Measurement of the Absolute Phase Error of Digitizers

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