The role of HVDC voltage waveforms on partial discharge activity in paper/oil insulation

Jiang, Tianyan; Cavallini, A.; Montanari, Gian Carlo; Li, J.

doi:10.1109/ceidp.2012.6378810

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…Some technical challenges to include local temperature rises in restricted spaces, combined action of DC and AC voltages, severe distortion of electric field, partial discharge, magnetic vibration, noise reduction, and transportation difficulties must be addressed in developing ±1100 kV converter transformers [57]. Following successful development and manufacturing of ±800 kV converter transformers, researchers have conducted much research on ±1100 kV converter transformers [58–62]. Research indicates that the optimised arrangement sequence of UHV converter transformers can make it easier to implement the vertical outlet line at the end of grid side.…”

Section: Key Equipmentmentioning

confidence: 99%

Research on key technologies in ±1100 kV ultra‐high voltage DC transmission

et al. 2018

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Based on completely mastering ±800 kV transmission technologies, the first ±1100 kV direct current (DC) transmission demonstration project is being constructed in China. Combining theoretical analysis and a large number of experiments, the margin of switching overvoltage in converter stations, the configuration scheme and performance of lightning arresters, the shielding angles of ground lines under different geographical conditions, and the maximum air gap of lines have been determined. The switching impulse flashover characteristics of equipotential sphere and typical rod-plane air gaps are also provided. The external insulation is designed differently for light, medium, and heavy pollution areas. For the ±1100 kV project, if the 8 × 1250 mm 2 conductors are applied, the pole gap is 26 m and the height of the line is 25 m, all the electromagnetic parameters will meet the requirement of international electromagnetic standards. The key design points of ±1100 kV converter transformers, smoothing reactors, converter valves, and wall bushings are researched and the 75 mH smoothing reactors, ±1100 kV/5000 A converter valves, and ±1100 kV/5523 A wall bushings are successfully made. The optimised hierarchical connection modes and coordination control measure of the ±1100 kV project are studied and the results can provide sufficient technical support for the demonstration project.

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Section: Key Equipmentmentioning

confidence: 99%

Research on key technologies in ±1100 kV ultra‐high voltage DC transmission

et al. 2018

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“…Concerning the principles and the mechanisms of PD under DC fields, remarkable investigations have been carried out [8,9], but the operational nature of HVDC systems introduces some challenges: harmonic injection that appears in the form of ripples in the DC side of the converters influences cable insulation [10]. Some recent studies have focused on PD activity under abnormal conditions that could be imposed by the operational conditions of HVDC equipment, through modelling [11,12] and experimental tests [13,14]. Moreover, cable insulation is influenced by the normal polarity reversal operation of Line Commuted Converters (LCC); this might be due to accumulation of space charges under the effect of DC electric fields [15][16][17] that result in locally intensified fields within the cable insulation.…”

Section: Introductionmentioning

confidence: 99%

Partial discharge behavior under operational and anomalous conditions in HVDC systems

Fard

Farrag

McMeekin

et al. 2017

IEEE Trans. Dielect. Electr. Insul.

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Power cables undergo various types of overstressing conditions during their operation that influence the integrity of their insulation systems. This causes accelerated ageing and might lead to their premature failure in severe cases. This paper presents an investigation of the impacts of various dynamic electric fields produced by ripples, polarity reversal and transient switching impulses on partial discharge (PD) activity within solid dielectrics with the aim of considering such phenomena in high voltage direct current (HVDC) cable systems. Appropriate terminal voltages of a genericHVDC converter were reproduced -with different harmonic contaminations -and applied to the test samples. The effects of systematic operational polarity reversal and superimposed switching impulses with the possibility of transient polarity reversal were also studied in this investigation. The experimental results show that the PD is greatly affected by the dynamic changes of electric field represented by polarity reversal, ripples and switching. The findings of this study will assist in understanding the behaviour of PDs under HVDC conditions and would be of interest to asset managers considering the effects of such conditions on the insulation diagnostics. where he is engaged in research on power system control and operation, renewable energy integration and energy storage systems.

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“…Introduction UHVDC transmission projects of a higher voltage level, such as 1,100 kV, are being planned in China (Pu et al, 2015). Both converter transformers and smoothing reactors are important Stray-field loss and flux distribution 1715 devices in UHVDC transmission system (Jiang et al, 2012;Cheng et al, 2008). In the light of the particularity of working conditions (Atkinson-Hope et al, 2012), a large number of harmonics flow into the windings of smoothing reactors (e.g.…”

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confidence: 99%

Stray-field loss and flux distribution inside magnetic steel plate under harmonic excitation

Zhao

Meng

Cheng³

et al. 2017

COMPEL

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Purpose This paper aims to investigate an efficient approach to model the electromagnetic behaviors and predict stray-field loss inside the magnetic steel plate under 3D harmonic magnetization conditions so as to effectively prevent the structural components from local overheating and insulation damage in electromagnetic devices. Design/methodology/approach An experimental setup is applied to measure all the magnetic properties of magnetic steel plate under harmonic excitations with different frequencies and phase angles. The measurement and numerical simulation are carried out based on the updated TEAM Problem 21 Model B+ (P210-B+), under the 3D harmonic magnetization conditions. An improved method to evaluate the stray-field loss is proposed, and harmonic flux distribution in the structural components is analyzed. Findings The influence of the harmonic order and phase angle on the stray-field loss in magnetic steel components are noteworthy. Based on the engineering-oriented benchmark models, the variations of stray-field losses and magnetic field distribution inside the magnetic components under harmonic magnetization conditions are presented and analyzed in detail. Research limitations/implications The capacity of the multi-function harmonic source, used in this work, was not large enough, which limits the magnetization level. Up to now, further improvements to increase the harmonic source capacity and investigations of the electromagnetic behaviors of magnetic steel components under multi-harmonic and DC-AC hybrid excitations are in progress. Originality/value To accurately predict the stray-field loss in magnetic steel plate, the improved method based on the combination of magnetic measurement and numerical simulation is proposed. The effects of the frequency and phase angle on the stray-field loss are analyzed.

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The role of HVDC voltage waveforms on partial discharge activity in paper/oil insulation

Cited by 10 publications

References 9 publications

Research on key technologies in ±1100 kV ultra‐high voltage DC transmission

Research on key technologies in ±1100 kV ultra‐high voltage DC transmission

Partial discharge behavior under operational and anomalous conditions in HVDC systems

Stray-field loss and flux distribution inside magnetic steel plate under harmonic excitation

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