Compact system for onsite calibration of 1000 kV voltage transformers

Zhao, Shuangshuang; Huang, Qifeng; Lei, Min

doi:10.1049/iet-smt.2017.0372

Cited by 9 publications

(8 citation statements)

References 15 publications

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“…Comparing formulas (3), (5) and (7)-(9), we can get ε˙= (ε˙1 + ε˙a)ε˙2ε˙3 (10) The phasor diagram for this three-stage VT is shown in Fig. 4 Moreover, the equation derivation process is shown as formulas (2)- (10).…”

Section: Error Analysismentioning

confidence: 98%

“…However, as we know, the capacitance stability is easily affected by temperature, time and even movement [7,8]. Electromagnetic standard VT for high voltage with single-stage structure can also reach relatively high accuracy class [9,10]. To develop the highest standard for high-voltage ratio at power frequency, this paper discusses a three-stage structure of VT, which can improve the class of accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Precision 500/√3 kV three‐stage VT with double excitation

Yin

Hao²,

Lan

et al. 2019

IET Science, Measurement & Technology

Self Cite

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Section: Error Analysismentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Precision 500/√3 kV three‐stage VT with double excitation

Yin

Hao²,

Lan

et al. 2019

IET Science, Measurement & Technology

Self Cite

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“…The research on high-voltage transformers is mainly focusing on two aspects. One is the series of multiple-capacitance voltage transformer and the other is the optical voltage transformer [11]. The temperature stability of the optical voltage transformer is poor, and the measurement accuracy may be affected.…”

Section: Principle and Structurementioning

confidence: 99%

“…As shown in Figure 8, on the basis of Formula (12), the capacitance can be obtained when the cylindrical conductor shells is off-axis. The errors of the complex rectangular, trapezoid, and Simpson transfer functions are given in Table 1, according to Formula (11). We can see that the error in the 0.95π period is 4.0266 × 10 −3 using Formula (10) to construct a traditional digital integrator, and the error is reduced to 5.7389 × 10 −5 after the error compensation channel is added on the basis of Figure 7.…”

Section: Calculation Of Off-axis Capacitancementioning

confidence: 99%

Research on Electronic Voltage Transformer for Big Data Background

Wang

et al. 2018

Symmetry

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A new type of electronic voltage transformer is proposed in this study for big data background. By using the conventional inverted SF_6 transformer insulation structure, a coaxial capacitor sensor was constructed by designing a middle coaxial electrode between the high-voltage electrode and the ground electrode. The measurement of the voltage signal could be obtained by detecting the capacitance current i of the SF_6 coaxial capacitor. To improve the accuracy of the integrator, a high-precision digital integrator based on the Romberg algorithm is proposed in this study. This can not only guarantee the accuracy of computation, but also reduce the consumption time; in addition, the sampling point can be reused. By adopting the double shielding effect of the high-voltage shell and the grounding metal shield, the ability and stability of the coaxial capacitor divide could be effectively improved to resist the interference of stray electric fields. The factors that affect the coaxial capacitor were studied, such as position, temperature, and pressure, which will influence the value of the coaxial capacitor. Tests were carried out to verify the performance. The results showed that the voltage transformer based on the SF_6 coaxial capacitor satisfies the requirements of the 0.2 accuracy class. This study can promote the use of new high-performance products for data transmission in the era of big data and specific test analyses.

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“…The errors of standard are <0.01% and 0.4 min. Meanwhile, this method has also been referred to carry on precise measurement of voltage ratio standard [6] benefited to the two independent structure design, this type SVT has been used to carry on the VT calibration onsite [7].…”

Section: Introductionmentioning

confidence: 99%