Capacitor voltage transformers

Wellings, J.G.; Mortlock, J.R.; Mathews, P.

doi:10.1049/jiee-1.1936.0195

Cited by 13 publications

(5 citation statements)

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“…According to [23], the ratio error of a CVT is defined as ε in equation (1), where V m and V p are the amplitude of the secondary voltage and the primary voltage, respectively, and k r is the rated transformation ratio. The phase displacement of a CVT is described as ∆ϕ in equation (2), where φ m and φ p represent the phase of the secondary voltage and primary voltage, respectively:…”

Section: Measurement Errormentioning

confidence: 99%

“…A capacitor voltage transformer (CVT) is allocated in a grid to measure the high voltage. Differing from conventional electromagnetic potential transducers (PTs), a CVT uses a capacitor divider to divide the high-voltage signal into a medium-voltage signal and then transforms it into a lowvoltage signal via an electromagnetic unit [1]. For a low-cost and good-insulation capacitor, a CVT is cheaper and more reliable than an electromagnetic potential transducer, especially in the ultra-high-voltage grid.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Detecting measurement error drifts of a capacitor voltage transformer on-line and its field application

Zhang¹,

Li²,

Yang³

et al. 2019

Meas. Sci. Technol.

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With the widespread application of capacitor voltage transformers (CVTs) in relaying, power system control and metering, detecting their measurement error drift has become an important and urgent task. Conventional methods are time-consuming and require the power to be cut, while some novel data-driven methods are impractical given their rigorous preconditions. In this paper, an innovative approach is proposed to detect the measurement error drift of CVTs connected to the same phase. Through principal component analysis, both the ratio error drift and the phase displacement drift of the CVT can be detected on-line. Besides the theoretical analysis, a monitoring system equipped with the proposed approach is installed in a 220 kV thermal power plant. The field application indicates it is not only sensitive to the measurement error drift but also good at locating faults.

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Section: Measurement Errormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detecting measurement error drifts of a capacitor voltage transformer on-line and its field application

Zhang¹,

Li²,

Yang³

et al. 2019

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The theory for them had also been much developed by followers once for some time, especially in circuit synthesis community. In 1936, being an expectation or proposition, the CVT being only a term was presented [4], with no claim made for presenting any new principles of design. One of its earliest practical devices was given and published in 1949 [5].…”

Section: Basics Of the Mutual Capacitormentioning

confidence: 99%

Mutual capacitor and its applications

Li¹,

Li²,

Li³

2014

J. eng.

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“…A CCVT is constructed from four general parts including capacitor units as a divider, a reactor as a compensator, a VT so-called as intermediate VT (IVT) for stepping down the reduced extra highvoltage and ferroresonance suppression circuit (FSC) as a damper. A CCVT structure tends to be more efficient in size and cost in comparison to a VT with the same characteristic [3][4][5]. However, comparing with a VT, the more complicated structure of a CCVT results in inaccuracy in both transient and steady-state operation [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%