High-Voltage Test and Measuring Techniques

Hauschild, Wolfgang; Lemke, E.

doi:10.1007/978-3-319-97460-6

Cited by 58 publications

(105 citation statements)

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“…The absolute and relative tolerances of the solver are, respectively, 1 × 10 −6 and 1 × 10 −3 . Finally, the pressure was calculated for each time step using Equation (10).…”

Section: Case Of Study and Simulation Resultsmentioning

confidence: 99%

“…There are different models for simulating the PD activity inside cavities within solid dielectrics and they differentiate in the way the electric field produced by the electric charge on the void surface, left by previous PD, is calculated [6]. PD models can be classified into [7]: analytical [8][9][10], three-capacitance [11] and finite-element analysis (FEA) [12,13] models.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Temperature and Pressure Changes due to Partial Discharges in Spherical Cavities Within Solid Dielectrics at Different Ageing Conditions

Rodríguez‐Serna

Albarracín‐Sánchez

2019

Energies

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Partial Discharges (PD) behavior during ageing of the insulation systems exhibits variations that depend on changes in gas filling characteristics and surface condition. In this article, numerical simulations of temperature and pressure behavior in an air-filled spherical cavity within a homogenous solid dielectric material due to PD activity are presented. An Analytical-Finite Element Analysis simulation approach was implemented in MATLAB and results exhibit reasonable agreement with experimental measurements reported by other authors. Simulation results allow concluding that pressure changes are directly related to variations in the PD behavior. In addition, affectations to cavity surface due to temperature increments can be discarded.Energies 2019, 12, 4771 2 of 11 Analytical models, in spite of their simplicity, are electrostatic field-based approaches and when homogeneous and symmetrical conditions are considered, such as cylinders or spheroids, the solutions obtained through analytical and FEA models are similar [15], and have the advantage that less computational time is required when simulations for a great number of periods of the AC-voltage signal are required such as in ageing analysis.PD are inherently multi-physical phenomena where electrical, thermal and mechanical physics are involved in each PD event [16]. Processes such as electron generation rate and surface charge decay through surface conduction are temperature and pressure dependent [17][18][19]. On the other hand, temperature affects the ageing process in solid dielectrics mainly due to the acceleration of chemical ageing dynamics [1].In this paper, the analytical and thermal models are presented in Section 2. In Section 3, PD in a spherical cavity are simulated using the analytical model at different ageing phases and results are compared with measured values reported by other authors. In addition, temperature and pressure variations due to PD events are calculated using a heat transfer FEA model, and the effect of temperature and pressure along ageing on the electron generation rate and in inception and extinction field magnitudes is analyzed and correlated with measured variables. A discussion on the simulation results is presented in Section 4. Finally, a conclusion is presented in Section 5.

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“…The absolute and relative tolerances of the solver are, respectively, 1 × 10 −6 and 1 × 10 −3 . Finally, the pressure was calculated for each time step using Equation (10).…”

Section: Case Of Study and Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Temperature and Pressure Changes due to Partial Discharges in Spherical Cavities Within Solid Dielectrics at Different Ageing Conditions

Rodríguez‐Serna

Albarracín‐Sánchez

2019

Energies

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“…First, the 50% flashover voltage for both positive and negative polarity is determined with the up-and-down method according to BS EN 60060-1 [21] until 10 or more flashovers occurred at 20°C and 1013 hPa for each setup. A summary of insulator test setups is provided in Table 1 alongside with pictures of the flashover tests in Fig.…”

Section: % Flashover Voltage Measurement Resultsmentioning

confidence: 99%

Breakdown process experiments of cap‐and‐pin insulators and their EMT leader progression model implementation

Koehler¹,

Swingler²,

Peesapati

2017

IET Generation, Transmission & Distribution

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In this paper, breakdown tests of cap-and-pin glass insulators with arcing horns, conducted at two different HV Labs, are presented. Since only volt-time curves are measured, a curve-fitting approach to determine leader-progressionmodel parameters is taken, which involves modelling of the impulse generator in detail and inclusion of the Motoyama model to simulate the breakdown. Furthermore a comparison of the breakdown simulation results with LPM parameters for an air gap electrode arrangement and the measurements is accomplished. Finally a curve-fitting procedure is developed to fit the resulting volt-time-curves from simulations to the measurements.

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“…In this paper, the additional filter is proposed to connect at the LV side of the HV testing transformer. (10) The analysis of the additional filter will be presented in the next subsection. Fig.…”

Section: Pd Detection Systemmentioning

confidence: 99%

Development of High-voltage Testing System Based on Power Frequency Converter Used in Partial Discharge Tests of Potential Transformers

Prombud¹,

Yutthagowith²

2020

Sensors and Materials

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We present the development of a high-voltage (HV) testing system based on a power frequency converter in HV and partial discharge (PD) tests of a potential transformer (PT). The converter with the proper filter is utilized as a low-voltage source connected with a HV transformer in the HV and PD tests. The converter is composed of a three-phase rectifier and a power converter based on pulse width modulation (PWM) with a unipolar switching technique. The vital problem in the HV and PD tests is that a converter with a high rate of rise and fall of voltage switching always generates a high noise level that affects the background noise in the PD test. In some PD tests, the noise level is higher than the acceptable level of the PD test requirement in HV equipment such as PTs and distribution transformers. It will be advantageous if an efficient PD testing system based on a power frequency converter can be developed for such tests. In this paper, the proper filter was analyzed and developed to meet the following requirements: the applied HV difference (root mean square voltage and peak voltage/ 2) to the test object and its total harmonic distortion should be less than 5%, and the background noise level in the PD tests should be less than half the acceptable PD level of such HV equipment specified by the relevant standards. In the case of the oil-type PT, the acceptable PD level is only 5 pC, so it is difficult to find a low-cost commercial frequency converter that satisfies this requirement. To verify the developed system, the performance characteristics of the developed converter have been investigated in terms of the background noise in the PD test, the total harmonic distortion of output voltage from the HV testing transformer side, and the input power consumption. The characteristics of the proposed and developed system are analyzed, and experimental results agree well with the simulation ones. The developed system can generate an output voltage of high quality that satisfies the standard requirement. At the test voltage of 40 kV rms , the total harmonic distortion voltage (THD v ) is less than 2% and the background noise is less than 2.5 pC. Moreover, the proper switching frequency and amplitude modulation index (m a ) are investigated, and it is found that the switching frequency from 1 to 20 kHz and m a of 0.8 and 1 do not affect the background noise level or the THD v , and the switching frequency from 1 to 4 kHz and m a of 1 are the best conditions since the input power 574 Sensors and Materials, Vol. 32, No. 2 (2020) consumption is the lowest. In addition, the developed system has been tested in the partial test of a real PT and found to be feasible. With its promising performance, the developed system is an attractive choice for use in HV and PD tests.

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High-Voltage Test and Measuring Techniques

Cited by 58 publications

References 0 publications

Numerical Simulation of Temperature and Pressure Changes due to Partial Discharges in Spherical Cavities Within Solid Dielectrics at Different Ageing Conditions

Numerical Simulation of Temperature and Pressure Changes due to Partial Discharges in Spherical Cavities Within Solid Dielectrics at Different Ageing Conditions

Breakdown process experiments of cap‐and‐pin insulators and their EMT leader progression model implementation

Development of High-voltage Testing System Based on Power Frequency Converter Used in Partial Discharge Tests of Potential Transformers

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