Comparison and analysis of three pulse injection methods in the pulsed electroacoustic technique used for long cables

Wang, X.; Hao, Jia-Qi; Xiong, Jiayu; Chen, C.; Wu, Kai; Fu, Mingli; Chen, G.

doi:10.1109/mei.2018.8430040

Cited by 7 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Simulation results show that the overlap of the acoustic In this work, the pulse generator has been applied into the partially stripped outer semiconductive layer of the cable. In future work, in order to verify the effect of injecting voltage pulses into a coaxial cable, further two test methods will be considered, such as pulse injection into the cable conductor and pulse injection into the measuring electrode [35].…”

Section: Resultsmentioning

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

Section: Resultsmentioning

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

show abstract

“…The thickness of the piezoelectric membrane plays an important role for the goodness of the measurement since the wave crossing time through the film is proportional to the spatial resolution of the results [16]. On the other hand, a thin film generates a small signal amplitude.…”

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

confidence: 99%

“…The higher peak The spatial resolution of the PEA setup may be defined as the minimum distance z over which a volumetric charge density variation can be measured. The spatial resolution is related to the pulse width ∆T p , to the sample thickness d, and to the sound velocity in the sample, about 2000 m/s in polyethylene, as follows [16,17]:…”

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

confidence: 99%

“…Usually, the η sa value is in the range between 0.02 and 0.05. The spatial resolution of the PVDF film is calculated by the time necessary for the pressure wave to cross the piezoelectric membrane with the time necessary to cross the sample [16]:…”

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

confidence: 99%

“…In this example, a current of 32 A passes through a mini-cable with an external radius of 3.05 mm to reach The properties of the E/O and O/E converters, particularly in terms of sampling rate, has to be taken into account in order to avoid cutting high frequency contributions. For this purpose, an improved version of Setup 3 is proposed in [16] and it consists of the direct connection between the amplifier and the oscilloscope. The latter is therefore insulated from the ground and connected to a PC by means of optical fiber.…”

Section: Setup 3-pulsed Voltage Applied To the Outer Semicon Layer Atmentioning

confidence: 99%

See 2 more Smart Citations

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

Review on Charge Generation, Measurement and Dissipation in Large-length HVDC Cable

Wang

Liu

Cui

et al. 2022

2022 7th Asia Conference on Power and Electrical Engineering (ACPEE)

View full text Add to dashboard Cite

Comparison and analysis of three pulse injection methods in the pulsed electroacoustic technique used for long cables

Cited by 7 publications

References 21 publications

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

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

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

Review on Charge Generation, Measurement and Dissipation in Large-length HVDC Cable

Contact Info

Product

Resources

About