Review of acoustic methods for space charge measurement

Ala, Guido; Caruso, M.; Cecconi, Vittorio; Ganci, Salvatore; Imburgia, A.; Miceli, R.; Romano, Pietro

doi:10.1109/aeit.2015.7415270

Cited by 26 publications

(8 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…sample interface with the direct wave started at the farthest one [18]. In order to avoid the abovementioned waveform distortion, the thicknesses of the layers of different materials of the PEA cell have to be calibrated, taking into account the multiple reflections.…”

Section: Principles Of the Pulsed Electro Acoustic (Pea) Method-applimentioning

confidence: 99%

“…Multiple reflections of the generated waves cause the distortion of the measurement output pattern. In particular, with reference to Figure 5, the high value of the sound velocity in the aluminum grounded electrode (about equal to 6400 m/s) could lead to the superimposing of the doubly reflected waves generated at the closer sample interface with the direct wave started at the farthest one [18]. In order to avoid the above-mentioned waveform distortion, the thicknesses of the layers of different materials of the PEA cell have to be calibrated, taking into account the multiple reflections.…”

Section: Principles Of the Pulsed Electro Acoustic (Pea) Method-applimentioning

confidence: 99%

See 1 more Smart Citation

Review of the PEA Method for Space Charge Measurements on HVDC Cables and Mini-Cables

et al. 2019

View full text Add to dashboard Cite

This review takes into account articles and standards published in recent years concerning the application of the Pulsed Electro Acoustic (PEA) method for space charge measurement on High Voltage Direct Current (HVDC) cables and mini-cables. Since the 80s, the PEA method has been implemented for space charge measurements on flat specimens in order to investigate space charge phenomena and to evaluate the ageing of dielectrics. In recent years, this technique has been adapted to cylindrical geometry. Several studies and experiments have been carried out on the use of the PEA method for full size cables and HVDC cable models. The experiments have been conducted using different arrangements of the measurement setup and focusing attention on different aspects of space charge phenomena. In this work, the importance of space charge measurement is highlighted and the state-of-the-art PEA method application to full size cables and mini-cables is described. The main aim of this paper is to offer a complete and current review of this technique. In addition, limits on the use of PEA method are examined and main possible directions of research are proposed in order to improve the applicability, reliability, and replicability of this method.

show abstract

Section: Principles Of the Pulsed Electro Acoustic (Pea) Method-applimentioning

confidence: 99%

Section: Principles Of the Pulsed Electro Acoustic (Pea) Method-applimentioning

confidence: 99%

Review of the PEA Method for Space Charge Measurements on HVDC Cables and Mini-Cables

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The first component allows the absorption of the acoustic waves with the aim to avoid reflection of the signal across the piezoelectric sensor. The amplifier, instead, is used to increase the voltage level of the piezoelectric sensor output signal [20][21][22][23].…”

Section: The Pea Methods For Cablesmentioning

confidence: 99%

“…Based on the considerations above, in 2017, some experts in the field of high voltage tests suggested the introduction of the space charge measurement for cables, during pre-qualification or type tests load cycle. Therefore, according to "IEEE Std 1732-2017" standard, both thermal step method (TSM) [18,19] or the pulsed electro-acoustic (PEA) [20] technique can be used to test the full-size cables specimens. Both measurement techniques are widely described and compared in [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

The Industrial Applicability of PEA Space Charge Measurements, for Performance Optimization of HVDC Power Cables

et al. 2019

View full text Add to dashboard Cite

Cable manufacturing industries are constantly trying to improve the electrical performance of power cables. During the years, it was found that one of the most relevant degradation factors influencing the cable lifetime is the presence of space charge in the insulation layer. To detect the accumulated charge, the pulsed electro-acoustic (PEA) method is the most used technique. Despite the wide use of the PEA cell, several issues are still present. In particular, the PEA output signal is strongly disturbed by the acoustic waves reflections within the PEA cell. This causes the distortion of the output signal and therefore the misinterpretation of the charge profiles. This, in turn, may result in an incorrect cable characterization from the space charge phenomenon point of view. In 2017, due to the proved degradation effect of the space charge accumulation phenomenon, the IEEE Std 1732 was developed. This standard describes the steps to be followed for the space charge measurement in cables specimens during pre-qualification or type tests. Therefore, cable manufacturing industries started to take a particular interest in these measures. In the light of this, the aim of the present work is to highlight that the enacted standard is not easily applicable since various problems are still present in the PEA method for cables. In particular, in this work, the effect of multiple reflected signals due to the different interfaces involved, but also the effect of the signal attenuation due to cable dielectric thickness, as well as the effect of the PEA cell ground electrode thickness in the output charge profile, are reported. These issues have been demonstrated by means of an experimental test carried out on a full-size cable in the Prysmian Group High Voltage laboratory. To better understand the PEA cell output signal formation, a PEA cell model was developed in a previous work and it has been experimentally validated here. In particular, simulations have been useful to highlight the effect of the reflection phenomena due to the PEA cell ground electrode thickness on the basis of the specimen under test features. Moreover, by analyzing the simulation results, it was possible to separate the main signal from the reflected waves and, in turn, to calculate the suitable ground electrode thickness for the cable specimen under test.

show abstract

“…73 Furthermore, the works proposed in Refs. 74 and 75 put in evidence the relationship occurring between the space charge measured by the FLIMM technique and the induced mechanical deformation, which was measured with the DIC (Digital Images Correlation) technique.…”

Section: G Focused Laser Intensity Modulation Methodsmentioning

confidence: 99%

Contributed Review: Review of thermal methods for space charge measurement

Imburgia

Romano

Caruso

et al. 2016

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

Decay of space charge in conjugated polymers measured using pyroelectric current transients J. Appl. Phys. 93, 2884 (2003) The space charge accumulation phenomenon has garnered great interest over the last two decades because of the increased use of direct current in high voltage electrical systems. In this context, a significant relevance has been achieved by the thermal methods, used for solid dielectrics. This paper presents a review of this non-destructive measurement system used for the measurement of space charge. The thermal pulse method, the thermal step method, and the laser intensity modulation method are described. For each configuration, the principle of operation, the thicknesses analyzed, and the spatial resolution are described, reporting also the main related applications. Published by AIP Publishing. [http://dx

show abstract

Review of acoustic methods for space charge measurement

Cited by 26 publications

References 71 publications

Review of the PEA Method for Space Charge Measurements on HVDC Cables and Mini-Cables

Review of the PEA Method for Space Charge Measurements on HVDC Cables and Mini-Cables

The Industrial Applicability of PEA Space Charge Measurements, for Performance Optimization of HVDC Power Cables

Contributed Review: Review of thermal methods for space charge measurement

Contact Info

Product

Resources

About