Rated Capacitance Determination of a New 1000 kV Equipotential Shielding Capacitor Voltage Transformer Under the Interference of Stray Capacitance

Dong, Wei; Zha, Kunpeng; Gao, Chong; Ji, Feng; He, Zhiyuan

doi:10.1109/tpwrd.2018.2850936

Cited by 9 publications

(5 citation statements)

References 11 publications

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“…In general, the total VDR of the CVT depends on the CVD, EMU, the temperature shift, power frequency variation, and proximity effects. Among them, it is believed that the CVD and EMU are the main factors [7]. e EMU is poured in an aluminum alloy box as a whole, so it is hardly affected by the external electromagnetic interference (EMI).…”

Section: Structure and Operation Principle Of The Cvtmentioning

confidence: 99%

“…us, it must be considered in the design of high-voltage devices. e stray capacitances of the CVT to ground and other charged parts play an important role in causing the VDR of the CVT [7]. Especially for the CVT applied in the ultra-high-voltage level, the effect of stray capacitance on its VDR is more serious [8].…”

Section: Introductionmentioning

confidence: 99%

“…Installation of a grading ring for a new UHV equipotential shielding CVT can improve the voltage distribution and compensate for the adverse effect caused by stray capacitance [3]. Furthermore, the rated bulk capacitances of this UHV CVT are derived under the interference of stray capacitances [7]. ey are much less than those of the traditional CVT without a grading ring for the same accuracy class.…”

Section: Introductionmentioning

confidence: 99%

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Studying the Effect of Stray Capacitance on the Measurement Accuracy of the CVT Based on the Boundary Element Method

et al. 2021

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The capacitive voltage transformer (CVT) is a special measuring and protecting device, which is commonly applied in high-voltage power systems. Its measurement accuracy is affected seriously by the stray capacitances of the capacitance voltage divider (CVD) to ground and other charged parts. In this study, based on the boundary element method, a mathematical model was established firstly to calculate the stray capacitance. Then, the voltage distribution of the CVD was obtained by the CVD’s equivalent circuit model. Next, the effect of stray capacitance on the voltage distribution and the voltage difference ratio (VDR) of CVD was analysed in detail. We finally designed three types of shield and optimized their structure parameters to reduce VDR. The results indicated that the average deviation rate between calculated and experimental measured voltages is only 0.015%; that is to say, the method has high calculation precision. The stray capacitance of the CVD to ground is far larger than that of the CVD to the high-voltage terminal. It results in the inhomogeneous distribution of voltage and the increase of VDR. For the test CVT, its VDR exceeds the requirement of class 0.2. Among all of the three types of shield, the C type reduced the VDR of the test CVT the most. After optimizing the structure parameters of C-type shield, the VDR is further reduced to 0.08%. It is not only in accord with the requirement of class 0.2 but also has an adequate margin.

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Section: Structure and Operation Principle Of The Cvtmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Studying the Effect of Stray Capacitance on the Measurement Accuracy of the CVT Based on the Boundary Element Method

et al. 2021

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“…DCTV is an important primary equipment for the construction and operation of the DC electric power transmission, which provides accurate and reliable measurement information for the control and protection of the system. Its operation reliability and measurement accuracy are directly related to the safe and stable operation of the DC electric power transmission [1][2][3]. There are high-frequency coupling channels between the DC transmission and AC/DC systems, and the DC system contains a large amount of high-order harmonics.…”

Section: Introductionmentioning

confidence: 99%

Transient frequency response test and measurement error prediction of DCTV based on adaptive inertial weight improved ACO

Yang,

Zhai,

Tang

et al. 2024

The Journal of Engineering

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A temporary frequency response test and measurement error prediction method of direct current voltage transformer (DCTV) based on artificial intelligence (AI) is proposed. Firstly, the frequency characteristic of direct current (DC) side voltage of DCTV is analyzed. On this basis, a DCTV transient Frequency Response testing method based on transient alternating current (AC) & DC superposition was developed. Then, the method of voltage sudden change and phase correction is used to achieve transient process DCTV response time testing. Finally, the ant colony optimization (ACO) algorithm was improved by combining an adaptive inertia weight improvement strategy, achieving accurate prediction of the Measurement Error of DCTV. The proposed AI based DCTV transient Frequency Response testing and Measurement Error prediction method were compared and analyzed with the other three methods through simulation experiments. Compared to the other three comparison methods, the maximum transformation error in the evaluation indicators of mean squared error (MSE), root mean squared error (RMSE), and mean absolute error (MAE) decreased by 0.006, 0.0119, and 0.0085, respectively, while the maximum phase error decreased by 0.2794, 0.3004, and 0.2823, respectively.

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“…9,14 However, the stray capacitances of compensation reactor and intermediate transformer are uncertain, and the parameter values of CVT are easily affected by temperature. 15 In order to calculate the values of stray capacitances, some works 16,17 pointed out that the relatively accurate method for calculating the values of stray capacitances is finite element analysis, but this method is complicated to operate.…”

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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Rated Capacitance Determination of a New 1000 kV Equipotential Shielding Capacitor Voltage Transformer Under the Interference of Stray Capacitance

Cited by 9 publications

References 11 publications

Studying the Effect of Stray Capacitance on the Measurement Accuracy of the CVT Based on the Boundary Element Method

Studying the Effect of Stray Capacitance on the Measurement Accuracy of the CVT Based on the Boundary Element Method

Transient frequency response test and measurement error prediction of DCTV based on adaptive inertial weight improved ACO

Stray capacitances calculation and harmonic measurement of capacitor voltage transformer

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