Influence of harmonics on partial discharge measurements and interpretation of phase-resolved patterns

Florkowski, Marek

doi:10.1016/j.measurement.2022.111198

Cited by 11 publications

(6 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…4, б) относятся к их распространению только в полости дефекта, а широкие -к движению зарядов вдоль поверхности дефекта (рис. 4, а) [23].…”

Section: результаты и обсуждение (Results)unclassified

“…Однако в последние годы эта модель была дополнена предположением о переходе от стримерного разряда к диффузному механизму (механизму Таунсенда). В последние годы к ним добавились механизмы образования на диэлектрических поверхностях дефекта в газовой полости плазменных образований, а также воздействия полей от предшествующих ЧР [23]. Разнообразие предложенных моделей механизмов ЧР, во-первых, предполагает многопараметричность физических процессов и, во-вторых, расширение немногочисленных экспериментальных методов изучения механизмов ЧР при больших напряженностях приложенных полей [17].…”

Section: результаты и обсуждение (Results)unclassified

“…Более того, опираясь на немногочисленные эксперименты на модельных дефектах того же вида: электрод-дефект-полость, диэлектрик-электрод [17,20,23], мы постарались связать предложенную нами эмпирическую модель влияния предшествующих ЧР на ускорение процессов старения высоковольтных изоляторов и способы дистанционного обнаружения критического состояния ВИ на подстанциях с полученными в ряде работ результатами. К общим для результатов на реальных изоляторах и модельных дефектах можно отнести: смещение фазовых интервалов генерации ЧР с ростом дефектов к близким к нулевым фазам положительных и отрицательных полупериодов приложенного высокого напряжения, увеличение плотности электронных зарядов на диэлектрической поверхности дефекта при накоплении количества предшествующих ЧР, повышение электропроводности и градиента поля на поверхности дефекта, уменьшение плотности электронного заряда в стримерном пучке в полости дефекта.…”

Section: результаты и обсуждение (Results)unclassified

See 2 more Smart Citations

Generation of critical acoustic pulses in high-voltage insulators due to induced fields of partial discharges

Golenishchev-Kutuzov

Semenikov

et al. 2023

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

View full text Add to dashboard Cite

THE PURPOSE of the article is to discuss an updated survey of the technical condition of porcelain high-voltage insulators of the type IOS 110/400, which had defects with partial discharge intensities above 4 nC, at Tatenergo substations. The experiments were carried out with simultaneous use of electromagnetic and acoustic research methods.During the analysis of the RESULTS obtained, the influence of the fields of previous powerful partial discharges on the technical condition of high-voltage insulators was established. The physical features of detecting powerful partial discharges by electromagnetic and acoustic methods have been studied. The conducted studies allow us to draw the following.CONCLUSIONS: the previous partial discharges can create additional long-lived electric fields on the dielectric surfaces of defects that exceed the field of the applied operating voltage in intensity; the necessity of using both physical methods simultaneously in the examination of high-voltage insulators in operation is shown.

show abstract

Section: результаты и обсуждение (Results)unclassified

See 1 more Smart Citation

Generation of critical acoustic pulses in high-voltage insulators due to induced fields of partial discharges

Golenishchev-Kutuzov

Semenikov

et al. 2023

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

View full text Add to dashboard Cite

show abstract

“…PD monitoring of HVDC cable systems is currently challenging [5][6][7]. The conventional identification of the type of defect involved in AC cable systems through phaseresolved PD pattern recognition, PRPD, [8,9] is not applicable in HVDC cable systems. Furthermore, when the voltage remains constant in an HVDC grid, the rate of PD pulses due to a defect, such as a cavity in the insulation, is negligible since they appear mainly when the voltage changes [7].…”

Section: Power Transformermentioning

confidence: 99%

New Synthetic Partial Discharge Calibrator for Qualification of Partial Discharge Analyzers for Insulation Diagnosis of HVDC and HVAC Grids

Khamlichi

Garnacho

Simón

2023

Sensors

View full text Add to dashboard Cite

A synthetic partial discharge (PD) calibrator has been developed to qualify PD analyzers used for insulation diagnosis of HVAC and HVDC grids including cable systems, AIS, GIS, GIL, power transformers, and HVDC converters. PD analyzers that use high-frequency current transformers (HFCT) can be qualified by means of the metrological and diagnosis tests arranged in this calibrator. This synthetic PD calibrator can reproduce PD pulse trains of the same sequence as actual representative defects (cavity, surface, floating potential, corona, SF6 protrusion, SF6 jumping particles, bubbles in oil, etc.) acquired in HV equipment in service or by means of measurements made in HV laboratory test cells. The diagnostic capabilities and PD measurement errors of the PD analyzers using HFCT sensors can be determined. A new time parameter, “PD Time”, associated with any arbitrary PD current pulse i(t) is introduced for calibration purposes. It is defined as the equivalent width of a rectangular PD pulse with the same charge value and amplitude as the actual PD current pulse. The synthetic PD calibrator consists of a pulse generator that operates on a current loop matched to 50 Ω impedance to avoid unwanted reflections. The injected current is measured by a reference measurement system built into the PD calibrator that uses two HFCT sensors to ensure that the current signal is the same at the input and output of the calibration cage where the HFCT of the PD analyzer is being calibrated. Signal reconstruction of the HFCT output signal to achieve the input signal is achieved by applying state variable theory using the transfer impedance of the HFCT sensor in the frequency domain.

show abstract

“…In the second decade of this century, this became the main reason to conduct a series of experimental studies on actual HVIs of electrical substations during their operation [17][18][19]. The main objectives were to study the dependencies of VLPD parameters on the characteristics of defects that cause them, as well as to develop methods for simultaneous noncontact detection of VLPDs by electromagnetic and acoustic methods [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Technical Condition of High-Voltage Insulators during Operation

Иванов¹,

Golenishchev-Kutuzov²,

Sadykov³

et al. 2022

Machines

View full text Add to dashboard Cite

During the operation process of high-voltage insulators, the characteristics of assessing their technical state are evaluated by using remote contactless monitoring and by subsequent forecasting of their residual life based on the developed set of diagnostic parameters of critical defects. Special attention is paid to the challenges of the practical application for remote contactless monitoring of high-voltage insulators’ current operating state. Measurements of characteristics for partial discharges on high-voltage insulators with various types of critical defects taken by electromagnetic and acoustic sensors are described. Based on the measurements, it was found that the unusual properties of the PD begin to manifest themselves starting from the intensities q ≥ 1.5–2 nC, and their maximum intensity can reach 5–7 nC. Up to PD intensities q ≤ 3 nC, most parameters of PD characteristics measured by electromagnetic and acoustic sensors correspond with an accuracy of 70–90%. It was found that for small defects with sizes d ≤ 300 μm in HVI, the PD intensity does not exceed 100 pC and depends little on the size of the defect. However, with an increase in the size of defects above 0.4–0.6 mm, a sharp rise in the intensity of the emerging VLPD begins.

show abstract

Influence of harmonics on partial discharge measurements and interpretation of phase-resolved patterns

Cited by 11 publications

References 46 publications

Generation of critical acoustic pulses in high-voltage insulators due to induced fields of partial discharges

Generation of critical acoustic pulses in high-voltage insulators due to induced fields of partial discharges

New Synthetic Partial Discharge Calibrator for Qualification of Partial Discharge Analyzers for Insulation Diagnosis of HVDC and HVAC Grids

Assessment of the Technical Condition of High-Voltage Insulators during Operation

Contact Info

Product

Resources

About