Partial discharge theory and technologies related to medium-voltage electrical equipment

Paoletti, G.J.; Golubev, A.

doi:10.1109/28.903131

Cited by 72 publications

(36 citation statements)

References 4 publications

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“…On the other hand, the discharge magnitude is greater when the semicon wall in the void is negative [17]. However, unlike the observations in [17,20], the findings of [21] suggested that negative PDs have higher D m as compared to positive PDs. The defects studied in the same reference were of different type at the termination of the medium voltage XLPE cable, but still involved the outer semicon layer and the insulation.…”

Section: Pd Initiationmentioning

confidence: 58%

“…But a more convincing reasoning for the asymmetry in distribution comes from considering the material in the role of cathode in each case [17,20]. When the inner conductor is at negative polarity (resulting in measured negative PDs), the EPR insulation wall acts as the cathode, thus exhibiting a higher rate of discharges consistent with observations in [20]. During positive polarity however, semicon layer is the cathode, resulting in higher over-voltages and therefore, higher discharge magnitudes [17,19].…”

Section: Void Discharge Behavior With Applied Voltage and Frequencymentioning

confidence: 83%

“…This role will reverse when the central conductor is at negative polarity. Based on the availability of free electrons, it is discussed in [20] how there is a greater tendency of discharges when insulation wall acts as the cathode. On the other hand, the discharge magnitude is greater when the semicon wall in the void is negative [17].…”

Section: Pd Initiationmentioning

confidence: 99%

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Impact of DC Voltage Enhancement on Partial Discharges in Medium Voltage Cables - An Empirical Study with Defects at Semicon-Dielectric Interface

Shekhar¹,

Feng²,

Gattozzi³

et al. 2017

Preprint

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Abstract:A scientific consensus is emerging on the benefits of dc distribution in medium voltage power systems of ships and cities. At least 50 % space savings and increased power transfer capacity are estimated with enhanced voltage dc operation of electric cables. The goal of this research is to contribute to developing the empirical knowledge on the insulation performance in order to validate the feasibility of such anticipated gains of dc versus ac, and to determine the comparative impact of different operational conditions from a component engineering point of view. The partial discharge (PD) activity in cables is measured under ac and dc conditions as an indicator of insulation performance. Specifically, PDs in defects at the semicon-insulation interface are studied in terms of inception voltage, repetition rate and discharge magnitude. Empirical understanding is drawn for operating voltage and frequency dependence of the discharge behavior in such voids in the range of 10 to 20 kV and 0 to 0.1 Hz, respectively. The change in PD activity with void evolution is explored.

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Section: Pd Initiationmentioning

confidence: 58%

Section: Void Discharge Behavior With Applied Voltage and Frequencymentioning

confidence: 83%

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Impact of DC Voltage Enhancement on Partial Discharges in Medium Voltage Cables - An Empirical Study with Defects at Semicon-Dielectric Interface

Shekhar¹,

Feng²,

Gattozzi³

et al. 2017

Preprint

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“…If a potential fault is detected prior to complete breakdown it can help avoiding significant economic loss and customer dissatisfaction [11]. …”

Section: Condition Monitoring Using Partial Dischargesmentioning

confidence: 99%

Air-Core Sensors Operation Modes for Partial Discharge Detection and On-line Diagnostics in Medium Voltage Networks

Kütt¹,

Shafiq²,

Lehtonen³

et al. 2013

Electrical, Control and Communication Engineering

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-In this paper, sensors for the application of high voltage networks insulation diagnostics are focused on. For detection and localization of the components with insulation deterioration, observing the partial discharge transients is one of the main methods. However, as the partial discharge traces are transients of extremely short duration, monitoring of such transients is also a challenging task. This paper presents the inductive sensors that would be suitable for the on-line partial discharge monitoring and the selection of operating mode and characteristics are discussed. The issues of resonance and signal processing are analyzed for the targets of reaching highest accuracy of the measurements. Operation criteria and performance limits such as sensitivity and upper bandwidth are particularly discussed. It is presented that in order to reach highest accuracy and sensitivity the sensor should be used in damped mode. Applying the accurate air-core inductive sensors would allow the condition monitoring systems to be cheaper and thus mounted for permanent and continuous condition monitoring in various locations in the power distribution networks.

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“…Partial discharges commonly occur in power cables such as those made from cross-linked polyethylene (XLPE) [5][6][7][8]. Therefore, analyses of partial discharge activities within power cables have to be carried out periodically to monitor the insulation performance of the cables.…”

Section: Introductionmentioning

confidence: 99%

Partial Discharge Characteristics in LLDPE-Natural Rubber Blends: Correlating Electrical Quantities with Surface Degradation

Aulia

Ahmad²,

Abdul‐Malek³

et al. 2016

Journal of Electrical Engineering and Technology

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-Partial discharges (PD) lead to the degradation of high voltage cables and accessories. PD activities occur due to the existence of impurities, voids, contaminants, defects and protrusions during the manufacture and installation of power cables. Commonly, insulation failures occur at cable joints and terminations, caused by inhomogeneous electric field distributions. In this work, a blend of natural rubber (NR) and linear low density polyethylene (LLDPE) was investigated, and the optimal formulation of the blend that could resist PD was discussed. The experiments were conducted under a constant high voltage stress test of 6.5 kV AC and the magnitude of partial discharge activities was recorded using the CIGRE method II. Pattern analysis of PD signals was performed along with the interpretation of morphological changes. The results showed that the addition of 10 wt% of NR and 5 wt% of Alumina Trihydrate (ATH) provided promising results in resisting PD activities. However, as the NR content increased, more micropores existed, thus resulting in increased PD activities within the samples.

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Partial discharge theory and technologies related to medium-voltage electrical equipment

Cited by 72 publications

References 4 publications

Impact of DC Voltage Enhancement on Partial Discharges in Medium Voltage Cables - An Empirical Study with Defects at Semicon-Dielectric Interface

Impact of DC Voltage Enhancement on Partial Discharges in Medium Voltage Cables - An Empirical Study with Defects at Semicon-Dielectric Interface

Air-Core Sensors Operation Modes for Partial Discharge Detection and On-line Diagnostics in Medium Voltage Networks

Partial Discharge Characteristics in LLDPE-Natural Rubber Blends: Correlating Electrical Quantities with Surface Degradation

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