Coupling Capacitor Voltage Transformer: A Device to Correct its Secondary Voltage in Real Time

Silva, Célio Anésio da; Fernandes, Darlan A.; Neves, Washington Luiz Araújo; Machado, Eubis Pereira

doi:10.1007/s40313-013-0014-5

Cited by 9 publications

(2 citation statements)

References 4 publications

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“…In the same way, the harmonic phases of CVT can also be corrected according to the phase deviation curves. Comparing with the capacitive current method, 1,11 the method 12,13 of harmonic measurement using amplitude‐frequency characteristic curve of CVT does not change the internal structure of CVT and has great advantages in economy, practicability, and security. When using amplitude‐frequency characteristic curve of CVT to correct the CVT harmonic voltages, the harmonic transfer characteristic curves of CVT must be fitted in the laboratory 9,14 .…”

Section: Introductionmentioning

confidence: 99%

Stray capacitances calculation and harmonic measurement of capacitor voltage transformer

Zhu

Shao

Nie

2022

Int J Numerical Modelling

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When the manufacturers produce capacitor voltage transformers (CVT), the function of harmonic measurement is not considered. Therefore, this paper explores methods to solve the problems of harmonic measurement from the perspective of manufacturers. Using the amplitude‐frequency characteristic curve of CVT under no‐load condition and standard environment as the benchmark, the estimation method of stray capacitance parameters in CVT based on CSO algorithm is proposed. Besides, in order to improve the accuracy of harmonic correction of CVT in different operating environments, this paper deeply studies the influence of oil temperature and industrial frequency on internal parameters and harmonic transfer characteristics of CVT. On this basis, this paper proposes a correction method of CVT harmonic transfer characteristic curves under different operating environments based on BP neural network algorithm. Finally, under the actual operating environment, calculating the amplitude‐frequency characteristic curve of CVT by utilizing the actual harmonic voltages at the secondary side of the TYP3‐0.02HF CVT and RCVT, and comparing it with the amplitude‐frequency characteristic curve of CVT predicted by the BP neural network. The results show that the proposed methods are effective and feasible.

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Section: Introductionmentioning

confidence: 99%

Stray capacitances calculation and harmonic measurement of capacitor voltage transformer

Zhu

Shao

Nie

2022

Int J Numerical Modelling

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“…Studies show that both VTs [3] and CCVDs [4] are limited in a frequency band to a few kHz at best, and even less when using resonance dampers. Various frequency response correction techniques have been proposed [5]. The broad and known frequency response of a transceiver has become more important recently, as the number of power electronic loads and sources in the power grid increases significantly.…”

Section: Introductionmentioning

confidence: 99%

New Sensor for Medium- and High-Voltage Measurement

2021

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Measurements of medium and high voltages in a power grid are normally performed with large and bulky voltage transformers or capacitive dividers. Besides installation problems, these devices operate in a relatively narrow frequency band, which limits their usability in modern systems that are saturated with power electronic devices. A sensor that can be installed directly on a wire and can operate without a galvanic connection to the ground may be used as an alternative voltage measurement device. This type of voltage sensor can complement current sensors installed on a wire, forming a complete power acquisition system. This paper presents such a sensor. Our sensor is built using two dielectric elements with different permeability coefficients. A finite element method simulation is used to estimate the parameters of a constructed sensor. Besides simulations, a laboratory model of a sensor was built and tested in a medium-voltage substation. Our results provide a proof of concept for the presented sensor. Some errors in voltage reconstruction have been traced to an oversimplified data acquisition and transmission system, which has to be improved during the further development of the sensor.

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Flexible Broadband Overvoltage Sensor for High-voltage Power Electronic Equipment

Kunpeng¹,

Ningming²,

Li³

et al. 2022

2022 7th Asia Conference on Power and Electrical Engineering (ACPEE)

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Coupling Capacitor Voltage Transformer: A Device to Correct its Secondary Voltage in Real Time

Cited by 9 publications

References 4 publications

Stray capacitances calculation and harmonic measurement of capacitor voltage transformer

Stray capacitances calculation and harmonic measurement of capacitor voltage transformer

New Sensor for Medium- and High-Voltage Measurement

Flexible Broadband Overvoltage Sensor for High-voltage Power Electronic Equipment

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