Note: An improved calibration system with phase correction for electronic transformers with digital output

Cheng, Hanmiao; Li, Hongbin

doi:10.1063/1.4929756

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…Then PCA is used to analyze the measured data, and monitor the metering performance of the analog EVTs. At the same time, the traditional performance calibration system [21] using a standard transformer is built to verify the proposed method. The accuracy of the calibration system is Class 0.05.…”

Section: Analysis Of Experimental Resultsmentioning

confidence: 99%

Monitoring the metering performance of an electronic voltage transformer on-line based on cyber-physics correlation analysis

Zhang

Tang

et al. 2017

Meas. Sci. Technol.

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Metering performance is the key parameter of an electronic voltage transformer (EVT), and it requires high accuracy. The conventional off-line calibration method using a standard voltage transformer is not suitable for the key equipment in a smart substation, which needs on-line monitoring. In this article, we propose a method for monitoring the metering performance of an EVT on-line based on cyber-physics correlation analysis. By the electrical and physical properties of a substation running in three-phase symmetry, the principal component analysis method is used to separate the metering deviation caused by the primary fluctuation and the EVT anomaly. The characteristic statistics of the measured data during operation are extracted, and the metering performance of the EVT is evaluated by analyzing the change in statistics. The experimental results show that the method successfully monitors the metering deviation of a Class 0.2 EVT accurately. The method demonstrates the accurate evaluation of on-line monitoring of the metering performance on an EVT without a standard voltage transformer.

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Section: Analysis Of Experimental Resultsmentioning

confidence: 99%

Monitoring the metering performance of an electronic voltage transformer on-line based on cyber-physics correlation analysis

Zhang

Tang

et al. 2017

Meas. Sci. Technol.

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“…The TMU is actually a time-to-digital converter [19]. According to practical requirements, if a frequency of counting pulse is 50 MHz, the TMU is able to measure the time interval with a precision of ±0.02 µs.…”

Section: Structure Designmentioning

confidence: 99%

Metrology and Measurement Systems

Cheng

Huang

et al. 2018

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Synchronization signals are requisite for calibrating electrical measurement devices with digital output when using conventional calibration methods. However, since the signal sampling process of the analogue merging units (MUs) operating in an intelligent substation does not rely on external synchronization signals, accuracy calibration without the use of synchronization signals is of particular importance in order to guarantee the measurement accuracy in practical situations. So far, very little research on calibration systems independent of synchronization signals has been performed. This paper presents a design of the calibration system without dependence on synchronization signals. To verify the feasibility of the proposed design, the designed system and a conventional calibration system have been employed in testing the accuracy of the same analogue MU of a 0.2 accuracy class. The comparison of the test results shows that the differences of ratio errors are below 0.02%, and the maximum difference of phase errors is about 4 ′ . This paper also provides a new efficient and significant calibration method which does not require any external synchronization signals.

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The traceability method of electronic transformer calibrators based on time series-weighted correlation degree extension integrating Hilbert phase-shift

Chen

et al. 2023

Review of Scientific Instruments

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The traceability method directly affects the reliability and accuracy of the measurement of electronic transformers. The stability and unreliable traceability performance of analog devices would affect the traditional analog differential method. Thus, we propose a digital differential method combining a time series-weighted correlation degree extension integrating Hilbert phase-shift of four-term continuous third-derivative Nuttall window function, effectively suppressing the end effect problem and realizing the high-precision addition of the differential. Results of simulation experiments showed that the differential’s deviation was <10−10, much less than that (1.32 × 10−4) due to the analog differential. The voltage and current ratio difference’s combined standard uncertainty was 5.01 × 10−5 and 5.08 × 10−5, respectively, and 0.1718′ in the phase error. Finally, an automatic traceability detection system was constructed. Compared with the traditional method, the accuracy and stability of the automatic system were better and could meet the traceability requirements for 0.05-accuracy electronic voltage transformer calibrator.

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Note: An improved calibration system with phase correction for electronic transformers with digital output

Cited by 5 publications

References 14 publications

Monitoring the metering performance of an electronic voltage transformer on-line based on cyber-physics correlation analysis

Monitoring the metering performance of an electronic voltage transformer on-line based on cyber-physics correlation analysis

Metrology and Measurement Systems

The traceability method of electronic transformer calibrators based on time series-weighted correlation degree extension integrating Hilbert phase-shift

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