Calibration of Commercial Test Sets for Non-Conventional Instrument Transformers

Mohns, E.; Mortara, A.; Çaycı, H.; Houtzager, E.; Fricke, S.; Agustoni, M.; Ayhan, B.

doi:10.1109/amps.2017.8078324

Cited by 13 publications

(9 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The inclusion of voltage amplifiers and dividers within the generation and acquisition stage would allow for increasing the output level, up to the IEEE Std range. However, the accuracy and stability of such devices still represent open issues for power system applications and their uncertainty contributions might largely exceed the target performance [31], [32]. Nevertheless, their frequency response can be carefully characterized and compensated, in order to mitigate the propagation of uncertainty to the final estimation of the reference values [17].…”

Section: Hardware and Software Architecture A Hardware Architecmentioning

confidence: 99%

Characterization of uncertainty contributions in a high-accuracy PMU validation system

et al. 2019

View full text Add to dashboard Cite

The effective deployment of Phasor Measurement Units (PMUs) in Distribution Networks (DNs) requires an enhancement in terms of estimation accuracy beyond the limits of IEEE Std C37.118.1 (IEEE Std), aiming at a Total Vector Error (TVE) in the order of 0.0x% in steady-state test conditions. As a consequence, a rigorous metrological characterization of PMU performance requires a validation system whose accuracy is at least one order of magnitude better than the one of the device under test, i.e. it requires a TVE in the order of 0.00x% in steady-state test conditions and 0.0x% in distorted or dynamic test conditions. In this paper, we describe the hardware and software architecture of a PMU validation system specifically designed for PMUs operating in DNs. We evaluate the quality of the generated test waveforms, and we carry out a thorough metrological characterization of the uncertainty contributions due to generation, acquisition and synchronization stages.

show abstract

Section: Hardware and Software Architecture A Hardware Architecmentioning

confidence: 99%

Characterization of uncertainty contributions in a high-accuracy PMU validation system

et al. 2019

View full text Add to dashboard Cite

show abstract

“…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%

“…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]. The above schemes, except for the second standard error scheme, which uses an inductive voltage divider to adjust the standard error to calibrate a DC ITTS, are all used for AC ITTSs and are ill-suited for DC ITTSs because they use AC signal processing technology.…”

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

View full text Add to dashboard Cite

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.

show abstract

“…Synchronisation for an accurate determination of the power quality parameters can be achieved by various methods regarding to the different aspects of the calibration system. For instance, in a laboratory environment, the synchronisation of the sampling processes of the reference measuring system is already possible by synchronising the sampling frequency f S to the fundamental frequency f 1 of the signal and by starting the sampling process of the reference system with the PPS [ 1 , 5 , 6 ]. Moreover, the software-based algorithms in the frequency domain have been used to synchronise an asynchronously running sampling to the measured signal for the measuring system [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Precise Amplitude and Phase Determination Using Resampling Algorithms for Calibrating Sampled Value Instruments

Chen

Mohns

Seckelmann

et al. 2020

Sensors

View full text Add to dashboard Cite

Sampling-based calibration systems for calibrating “Sampled Value” (SV)-based instruments for substation automation require synchronised and time-aligned sampling processes. As the signal frequency of the power grid is always asynchronous to the standardised sampling frequencies according to IEC 61869-9, the sampled waveforms of the calibration system and of the SV-based device under test can be resampled to be synchronised and to allow better accuracy in the following measurements based on the Discrete Fourier Transform (DFT) of the resampled waveforms. The paper presents simulations and results for different resampling algorithms. A modified sinc interpolation method with a finite impulse response (FIR) is presented. The deviation of the results for the root mean square (RMS) and phase angle is in the order of 10−8V/V (or rad) for normalised frequencies of up to 20% of the sampling frequency. No practical degradation in the presence of noise and harmonics could be observed. In addition, laboratory experiments demonstrate the realization of the proposed resampling process in the future SV-based calibration systems for SV-based instrumentation.

show abstract

Calibration of Commercial Test Sets for Non-Conventional Instrument Transformers

Cited by 13 publications

References 7 publications

Characterization of uncertainty contributions in a high-accuracy PMU validation system

Characterization of uncertainty contributions in a high-accuracy PMU validation system

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

Precise Amplitude and Phase Determination Using Resampling Algorithms for Calibrating Sampled Value Instruments

Contact Info

Product

Resources

About