The development of a two-stage voltage transformer of 110/&amp;#x221A;3 kV and class 0.001

Shao, Haiming; Lin, Feipeng; Liang, Bo; Qin, Xichang; Peng, Shixiong

doi:10.1109/cpem.2014.6898615

Cited by 4 publications

(5 citation statements)

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“…Table 1 lists theẽ T23 andẽ T1 in condition of corresponding voltages. In Fig.4, the standard VT is a 110/ √ 3 kV semiinsulated LVE-TSVT (T 0 ) [13]. A 8-dial two-stage inductive voltage divider (IVD) was cascaded with the series secondary windings of T 1 and T 23 in order to match the ratios between the 110/ √…”

Section: B the Error Measurements Ofẽ T1 Andẽ T23 In The Serial Connmentioning

confidence: 99%

“…In the bridge, seven dials for capacitive ratio and dissipation were designed, and an external phase-lock-amplifier was attached as a null indicator to obtain a 1 × 10 −7 adjustment. The current dependence of the fixed ratio of this C-tanδ bridge was checked better than 3 × 10 −7 by comparing two capacitors with negligible voltage coefficient [13]. 3 kV LVE-TSVT with the HVSC method (#1) and the series summation method, including the additional errors ignored (#2) and corrected (#3).…”

Section: The Verification By Measuring the Vc Of The 110/ √ 3 Kv Lmentioning

confidence: 99%

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The Research on Additional Errors of Voltage Transformer Connected in Series

2020

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The series summation method is an important method in the calibration of the voltage coefficient (VC) of the standard voltage transformers (VTs), in which the key step is connecting a fullyinsulated VT and a semi-insulated VT in series, and comparing them with the third VT under test. Caused by the imperfect electrical shielding of the serially-wound VTs, additional errors are introduced in the calibration. By analyzing the cause of the additional errors in the serial connection of the VTs, two methods were designed in this paper to measure the additional errors. The proposed methods were harnessed to measure the additional errors for a serial connection of a 35 kV fully-insulated two-stage voltage transformer (TSVT) and a 35 kV semi-insulated TSVT. The results show that the two methods give a consistency of better than 1.0 × 10 −6 in ratio error and 2.0 µrad in phase displacement, respectively. The accurate measurement of the series additional errors and the correction of them significantly improve the accuracy of the VC measurement of a 110/ √ 3 kV TSVT based on the series summation method. Furthermore, the VC measurement result is verified by the consistency of the series summation method with the series additional errors corrected and the high-voltage standard capacitor method. INDEX TERMS Error analysis, high-voltage techniques, series summation method, standard voltage transformer, the serial connection of the transformers, voltage coefficient.

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Section: B the Error Measurements Ofẽ T1 Andẽ T23 In The Serial Connmentioning

confidence: 99%

Section: The Verification By Measuring the Vc Of The 110/ √ 3 Kv Lmentioning

confidence: 99%

The Research on Additional Errors of Voltage Transformer Connected in Series

2020

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“…To build the highest standard based on the voltage transformer, Shao et al [6] present here a new TSVT structure, where a low-voltage excitation winding replaces the high-voltage excitation winding of a traditional TSVT. With only one high-voltage ratio winding wound around the cores, it reduces the requirement of insulation but keeps the two-stage structure and the error characteristic, to acquire high-accuracy voltage ratio standards for 110/ √ 3 kV and higher voltage.…”

Section: Introductionmentioning

confidence: 99%

The Development of <inline-formula> <tex-math notation="LaTeX">$110/\sqrt {3} \textrm {kV}$ </tex-math></inline-formula> Two-Stage Voltage Transformer With Accuracy Class 0.001

Shao

Lin

Liang

et al. 2015

IEEE Trans. Instrum. Meas.

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This paper presents a new structure of a two-stage voltage transformer (TSVT) with toroidally wound ring cores excited by low voltage for high-voltage measurement. In the new TSVT, two high-voltage windings are wound on two separate groups of toroidally wound ring cores, respectively. This avoids the insulation problem in the traditional TSVT structure for high voltage and high accuracy, in which, the high-voltage excitation and ratio windings need to be wound together around overlapped cores. Three TSVTs, 10, 35, and 110/ √ 3 kV, were developed based on this scheme. The uncertainties of magnitude and phase of these TSVTs are all less than 3.2 × 10 −6 and 1.1 µrad, respectively, at reference voltage. Comparative measurements with a high-voltage capacitive divider and a current comparator illustrate that in the range of 20%-120% rated voltage, variations of no-load errors of new TSVTs are as follows: 2-4 × 10 −6 and 2 µrad in magnitude and phase, respectively, which reach class 0.0005 to class 0.001.

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“…Recent work on accurate characterisation of voltage dividers 1 The manufacturers and instrumentation mentioned in this paper do not indicate any preference by the authors, nor do they indicate that these are the best available for the application discussed. focuses on step-up methods for calibration of conventional voltage transformers [11]- [14]. Mohns et al have recently developed and characterised a CVD, however this CVD is mainly designed for short-term stability and high linearity to facilitate the step-up characterisation of conventional VTs.…”

Section: Introductionmentioning

confidence: 99%

Verification of a Capacitive Voltage Divider With 6-μrad Uncertainty Up To 100 kV

Zhao

Rietveld

2021

IEEE Trans. Instrum. Meas.

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A reference setup for system calibration of industrial transformer loss measurement (TLM) systems consists of three main components, a voltage divider, current transformer and a power meter, and their phase displacements should each not be more than 10 µrad to achieve an overall system uncertainty of better than 20 µW/VA. We have extensively verified the uncertainty level of the current-comparator-based capacitive voltage divider (CVD) used in the TLM reference setup of the Van Swinden Laboratorium (VSL), both from the component level and the system as a whole. Different practical conditions relevant for on-site measurements are considered, e.g. measurement cable lengths, cable types and grounding. The verification measurement results show an agreement of better than (6 ± 6) × 10 −6 in ratio error and (4 ± 6) µrad in phase displacement between the CVD component and system calibrations up to 100 kV. Requirements for achieving this agreement are adequate grounding of the CVD and the use of triax cable between the HV capacitor and the CVD low-voltage electronics in case large distances have to be covered on-site. The (4 ± 6) µrad agreement in phase displacement is well within the required 10 µrad limit for voltage measurements as part of on-site TLM system calibrations with 20 µW/VA overall uncertainty at low power factors.

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The development of a two-stage voltage transformer of 110/√3 kV and class 0.001

Cited by 4 publications

References 0 publications

The Research on Additional Errors of Voltage Transformer Connected in Series

The Research on Additional Errors of Voltage Transformer Connected in Series

The Development of <inline-formula> <tex-math notation="LaTeX">$110/\sqrt {3} \textrm {kV}$ </tex-math></inline-formula> Two-Stage Voltage Transformer With Accuracy Class 0.001

Verification of a Capacitive Voltage Divider With 6-μrad Uncertainty Up To 100 kV

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