Partial Discharge Inception Voltage in DC insulation systems: a comparison with AC voltage supply

Seri, Paolo; Cirioni, Leonardo; Naderiallaf, Hadi; Montanari, Gian Carlo; Hebner, Robert E.; Gattozzi, Angelo L.; Feng, Xianyong

doi:10.1109/eic43217.2019.9046630

Cited by 25 publications

(14 citation statements)

References 9 publications

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“…The physical mechanism of PD under DC voltage is approximately the same as under AC, being driven by field magnitude, electron injection probability and gas‐ionisation features [16, 34, 39]. The phenomenology of PD under DC and AC is however significantly different, particularly in terms of repetition rate and magnitude [3, 36, 40]. This impacts significantly on the ageing rate and life and therefore the following discussion will mostly focus on those parameters, i.e.…”

Section: Factors Of Influence Accelerating the Ageing Process Undermentioning

confidence: 99%

Ageing and reliability of electrical insulation: the risk of hybrid AC/DC grids

et al. 2020

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With an impetuous growth of DC links and future grids that will be often hybrid, providing AC and DC supply to nearby or the same customer, an important element is often neglected, that is, electrical insulation. There are no doubts that overhead lines will step back compared to insulated cables, for known reasons of environmental impact, right of way and reliability, especially in an urban or harsh environment. On the other hand, while AC insulation systems have been investigated and used for decades, there is no analogue experience for DC polymeric insulation, nor for insulation systems subjected to power electronics supply. This study aims at enhancing the attention on this topic, focusing on insulation ageing mechanisms and models of relevance for hybrid AC/DC assets and grids. Ageing and life models for AC, DC and power electronics supply are discussed and compared to experimental data, focusing on partial discharge and space charge. It is shown how these two phenomena affect lifetime for different AC, DC and transient operating conditions. The main drivers for insulation design and material selection are discussed, showing that insulation reliability can be achieved only if operating stresses, ageing mechanisms and life models are known and accounted for properly by insulation designers.

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Section: Factors Of Influence Accelerating the Ageing Process Undermentioning

confidence: 99%

Ageing and reliability of electrical insulation: the risk of hybrid AC/DC grids

et al. 2020

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“…Expressions for PDIV AC and PDIV DC , and their ratio, can be simply obtained resorting to the classic equivalent circuit generally used to describe PD occurrence (abc circuit), and assuming a deterministic discharge process, [22], [23]:…”

Section: Partial Discharge Inception In DC and Ac And Impact On mentioning

confidence: 99%

A Contribution to Everlasting Electrical Insulation for DC Voltage: PD-Phobic Materials

2020

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This paper focuses on the design of insulating materials candidate from DC-supply applications, proposing viable solutions that may increase the defect-tolerance of an insulation system and avoid the presence of highly energetic phenomena, specifically partial discharges, which can cause premature insulation breakdown. It is shown that, in principle, polymeric materials for DC insulation can be structured, possibly through nanotechnology, to avoid partial discharge inception in steady state even in UHVDC cables and high-field design insulation systems, which would exclude partial discharge degradation from the aging factors that can affect insulation reliability and life. This approach may provide basic tools to design DC insulation having electro-thermal life and reliability of virtually unlimited extent, thus of so-called PD-phobic materials. INDEX TERMS Cables, electro-thermal life, HVDC, insulation reliability, nano-filled materials, partial discharge (PD), partial discharge inception voltage (PDIV), polymeric materials.

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“…(3), can be obtained from the classic abc circuit of Fig. 3, valid for both AC and DC power supply, [4,5]…”

Section: Partial Discharge Inception In Transient and DC Steady mentioning

confidence: 99%

“…Then, a more direct criterion could consist of the estimation of the PD repetition rate. Because PD are activated mostly during applied voltage gradients, one can expect that the repetition rate will drop drastically when the field in the defect where PD are generated reaches the DC steady conditions (considering that PD repetition rate under DC is much smaller than in AC [4,5]). Note that PD magnitude might be not a criterion as valid as repetition rate, because it may show smaller time variation than the latter, mostly driven by the random delay time of the incepting electron, which is much more influential for PD amplitude in AC than in DC [4].…”

Section: Partial Discharge Measurements Under DC Supplymentioning

confidence: 99%

“…This would determine operating conditions where defects could incept partial discharges, PD, under AC supply but not DC, and vice versa [4]. Also, PD under DC supply can be activated as a function of load conditions, as shown in [5] and discussed in the next Section. On the other hand, it is clear, at least for those who try, that measuring PD under DC is a hard challenge, mainly because recognizing PD from noise is still a partly unresolved issue, and the repetition rate of PD may be largely smaller than that of noise impulses [6].…”

Section: Introductionmentioning

confidence: 99%

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Partial discharge measurements of DC insulation systems: the influence of the energization transient

Seri

Ghosh

Cirioni

et al. 2019

2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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This paper introduces techniques for partial discharge, PD, recognition under DC, both in steady state and in transient condition, during which the field in insulation varies slowly from a permittivity-driven to a conductivity-driven profile. This transient can be significantly long, depending on insulating material characteristics, and condition PD phenomenology and impact of PD on insulation life. Focusing mainly on the behavior of PD repetition rate as a function of time, after insulation energization by a DC voltage step, PD triggered by transient field can be separated from those relevant to steady state, which may indicate a criterion to estimate the partial discharge inception voltage, PDIV, under DC supply.

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Partial Discharge Inception Voltage in DC insulation systems: a comparison with AC voltage supply

Cited by 25 publications

References 9 publications

Ageing and reliability of electrical insulation: the risk of hybrid AC/DC grids

Ageing and reliability of electrical insulation: the risk of hybrid AC/DC grids

A Contribution to Everlasting Electrical Insulation for DC Voltage: PD-Phobic Materials

Partial discharge measurements of DC insulation systems: the influence of the energization transient

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