Designing a compensating electronic circuit to enhance capacitive voltage transformer characteristics

Zare, Mohammad Hadi; Mirzaei, Ahmad; Abyaneh, Hossein Askarian

doi:10.1109/pspc.2015.7094922

Cited by 3 publications

(4 citation statements)

References 15 publications

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“…When the capacitance C CA is 0.061 pF, the three normalized ratios become equal to 1. It indicates that a specific set of parameters satisfies the three equations given in (11). The parameters for the layout of this case study are presented in Table 3.…”

Section: Compensation Of the Coupling Capacitancesmentioning

confidence: 99%

“…In high-voltage substations, voltage measurement is often carried out using capacitive voltage transformers (CVT) or inductive voltage transformers (IVT). Although these devices provide accurate measurements at nominal frequency, their outputs deviate significantly at higher frequencies [ 7 , 8 , 9 , 10 , 11 ]. Consequently, this characteristic restricts their application for measuring fast transients.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome the limitations of voltage transformers, specific techniques have been proposed in the literature [ 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. Most of these methods focus on correcting the distorted output voltage.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of Transient Overvoltages by Capacitive Electric Field Sensors

Probst,

Beltle,

Tenbohlen

2024

Sensors

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The accurate measurement and the investigation of electromagnetic transients are becoming more important, especially with the increasing integration of renewable energy sources into the power grid. These sources introduce new transient phenomena due to the extensive use of power electronics. To achieve this, the measurement devices must have a broadband response capable of measuring fast transients. This paper presents a capacitive electric field sensor-based measurement system to measure transient overvoltages in high-voltage substations. The concept and design of the measurement system are first presented. Then, the design and concept are validated using tests performed in a high-voltage laboratory. Afterwards, two different calibration techniques are discussed: the simplified method (SM) and the coupling capacitance compensation (CCC) method. Finally, three recorded transients are evaluated using the calibration methods. The investigation revealed that the SM tends to overestimate the maximum overvoltage, highlighting the CCC method as a more suitable approach for calibrating transient overvoltage measurements. This measurement system has been validated using various measurements and can be an efficient and flexible solution for the long-term monitoring of transient overvoltages in high-voltage substations.

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Section: Compensation Of the Coupling Capacitancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Measurement of Transient Overvoltages by Capacitive Electric Field Sensors

Probst,

Beltle,

Tenbohlen

2024

Sensors

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“…Using multiple scales method, Lyapunov exponents are obtained and the attraction behaviour in route to chaos is analysed by chaos theory. The ferroresonance phenomenon in capacitive voltage transformer (VT) has been commonly regarded as an unexplained phenomenon [26, 27]. Some basic steady‐state types of ferroresonance oscillations have been studied by researchers such as sinusoidal oscillation (monoharmonic), steady state oscillation including odd harmonics only and even and odd harmonics (polyharmonic), quasi‐periodic oscillations with a non‐periodic, irregular aspect, subharmonics and chaotic ferroresonance [28].…”

Section: Introductionmentioning

confidence: 99%

Smart solid‐state ferroresonance limiter for voltage transformers application: principle and test results

Heidary

Radmanesh

2018

IET Power Electronics

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This study employs a novel smart solid state ferroresonance limiter (SSFL) for stabilising the chaotic behaviour of a voltage transformer (VT). It is shownthat the ferroresonance overvoltage in VTs includes some resonance modes that can be classified as a fundamental, sub-harmonic and chaotic oscillations. The effects of the suggested SSFL on decreasing the amplitude of the ferroresonance over-voltages are examined. To confirm the simulation results, a laboratory prototype is implemented and tested. The performance of the suggested SSFL is simulated using MATLAB software and experimental results are compared with the simulation results. The measurement and experimental results are in agreement and clearly show the ability of the suggested SSFL on ferroresonance cancellation and VT protection against the occurred overvoltage.

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Ferro-Resonance Analysis of Capacitor Voltage Transformer with Fast Saturation Damper

et al. 2022

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With the increase in capacitor voltage transformer (CVT) operation life, CVT impedance changes, and the short-time switching of overhead lines, it is very easy to cause a transient oscillation accident in which a CVT participates, reduce the insulation level of a CVT, and even induce regional power grid oscillation and easily cause capacitor breakdown, after long-term operation with defects. In this paper, the whole power network, including the generator, power grid, and consumer, is modeled, and the theoretical model of the CVT ferro-resonance connected grid is built. The frequency spectrum analysis, and the measurements of resonance bus voltage and line voltage, were carried out to find the design method of a fast saturation damper (FSD) and its voltage–current characteristics that affect the vibration, based on theory and practice; this paper puts forward effective measures to reduce the resonance effect of a CVT in operation, and avoid the oscillation of the line and even the regional power grid system.

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Designing a compensating electronic circuit to enhance capacitive voltage transformer characteristics

Cited by 3 publications

References 15 publications

Measurement of Transient Overvoltages by Capacitive Electric Field Sensors

Measurement of Transient Overvoltages by Capacitive Electric Field Sensors

Smart solid‐state ferroresonance limiter for voltage transformers application: principle and test results

Ferro-Resonance Analysis of Capacitor Voltage Transformer with Fast Saturation Damper

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