PD characteristics at square shaped voltages applying two different detecting techniques

Madonia, Antonino; Romano, Pietro; Hammarström, Thomas; Gubanski, Stanislaw; Viola, Fabio; Imburgia, A.

doi:10.1109/ceidp.2016.7785646

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…The second setup, a traditional AC IEC 60270 PD test circuit, employs a 50/60 Hz HV transformer, a filter resistor of 100 kΩ to limit power system noise and a coupling capacitor of 100 pF connected in parallel with the PD source. More details about both these setups can be found in [7][8][9].…”

Section: High Voltage Generation Systemsmentioning

confidence: 99%

“…Increased use of power electronic devices based on Insulated-Gate Bipolar Transistors (IGBTs), Thyristors (SCRs) and Mosfets (FETs) results in the appearance in power systems of voltage waveforms that are different from sinusoidal and often contain fast transients. Exposure of electrical devices to such voltage waveforms yields new types of problems, principally in their insulation systems, and much work has been dedicated to evaluating these effects [1][2][3][4][5][6][7]. In the case of standard 50-60 Hz sinusoidal sources, the partial discharge (PD) detection techniques have taken advantage of the substantial difference in the frequency content between the driving voltage source and the discharge signals.…”

Section: Introductionmentioning

confidence: 99%

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Partial discharges at different voltage waveshapes: Comparison between two different acquisition systems

Romano

Hammarström

Bengtsson

et al. 2018

IEEE Trans. Dielect. Electr. Insul.

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In modern HV apparatuses the wide use of electronic converters, increase the stress on the involved insulation systems and thus affect the reliability of the whole power grid. Additionally, such non-sinusoidal voltage shapes contain high gradient flanks that create problems in the detection of partial discharge (PD) activity. The aim of this paper is to discuss the methodology on how to suitably approach PD detection in insulation systems exposed to various voltage waveshapes in general by comparing two different measuring systems. The first one, equipped with a resonant PD decoupler, designed specifically for detection at typical power electronic waveshapes and the other one, based on an antenna sensor with flat frequency response, a general-purpose AC system. It was found that not so much the acquisition principles as the features are important for effective detection of PD signals appearing at rapidly changing test voltages from power electronic devices.

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Section: High Voltage Generation Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Partial discharges at different voltage waveshapes: Comparison between two different acquisition systems

Romano

Hammarström

Bengtsson

et al. 2018

IEEE Trans. Dielect. Electr. Insul.

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“…However, from the insulation side, frequency and slew rate are two of the most critical factors of a voltage pulse, which influences the level of degradation of the insulation systems that are exposed to such voltage pulses [4]. Solid dielectrics are found to be vulnerable to frequency, while the dominant factor for PD inception in liquid dielectrics is rising [5,6]. In this regard, the study of the insulation degradation of silicone gel, which has the properties of both liquids and solids can be challenging.…”

Section: Introductionmentioning

confidence: 99%

Partial Discharge Analysis under High-Frequency, Fast-Rise Square Wave Voltages in Silicone Gel: A Modeling Approach

Borghei

Ghassemi

2019

Energies

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Wide bandgap (WBG) power modules able to tolerate high voltages and currents are the most promising solution to reduce the size and weight of the power management and conversion systems. These systems are envisioned to be widely used in the power grid and the next generation of more (and possibly all) electric aircraft, ships, and vehicles. However, accelerated aging of silicone gel when being exposed to high frequency causes fast rise-time voltage pulses that can offset or even be an obstacle for using WBG-based systems. Silicone gel is used to insulate conductor parts in the module and encapsulate the module. It has less electrical insulation strength than the substrate and is susceptible to partial discharges (PDs). PDs often occur in the cavities located close to high electric field regions around the sharp edges of metallization in the gel. The vulnerability of silicone gel to PDs occurred in the cavities under repetitive pulses with a high slew rate investigated in this paper. The objective mentioned above is achieved by developing a Finite-Element Analysis (FEA) PD model for fast, repetitive voltage pulses, which have been done for the first time to the best of our knowledge. By using the model, the influence of frequency and slew rate on the magnitude and rate of PD events is studied.

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A new approach to calibrate the thermal conditions in space charge measurements on HVDC mini-cables

Rizzo

Romano

Ala

et al. 2019

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

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PD characteristics at square shaped voltages applying two different detecting techniques

Cited by 4 publications

References 10 publications

Partial discharges at different voltage waveshapes: Comparison between two different acquisition systems

Partial discharges at different voltage waveshapes: Comparison between two different acquisition systems

Partial Discharge Analysis under High-Frequency, Fast-Rise Square Wave Voltages in Silicone Gel: A Modeling Approach

A new approach to calibrate the thermal conditions in space charge measurements on HVDC mini-cables

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