Enhanced energy efficiency of underground cables

Richardson, Brent; Ramachandran, Ram

doi:10.1109/tdc.2010.5484220

Cited by 3 publications

(3 citation statements)

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“…The most-studied property of XLPE is its dielectric loss coefficient tan(delta) [2,4,8,9,[12][13][14][15][16][17][18][19][20][21]23,27,33,34,39,[41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58]. Authors have analyzed the effects of frequency, aging time, cable life, voltage test, and temperature on the tan(delta) distribution and value.…”

Section: Introductionmentioning

confidence: 99%

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Electric Field Distribution and Dielectric Losses in XLPE Insulation and Semiconductor Screens of High-Voltage Cables

Nadolny

2022

Energies

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This article presents the electric field distribution E and dielectric losses ΔPdiel. in the insulation system of high-voltage cables. Such a system consists of inner and outer semiconductor screens and XLPE insulation. The aim of this study was to compare the values of E and ΔPdiel. between semiconductor screens and XLPE insulation. The objects of the research were high-voltage cables of 110 kV, 220 kV, 400 kV, and 500 kV. The geometrical dimensions of the cables, especially the radii of individual layers of insulation, as well as the electrical properties of the screens and XLPE, were taken from the literature. Semiconductor screens and XLPE insulation were treated as a system of three concentric cylinders. When determining the electric field distribution, both the electrical permittivity and electrical conductivity, which, in the case of semiconductor screens, play important roles, were taken into account. The obtained results prove that both the electric field distribution E and dielectric losses Pdiel. are significantly larger in XLPE insulation than in semiconductor screens. The intensity E in XLPE insulation is about four orders of magnitude greater than the intensity in semiconductor screens. Dielectric losses ΔPdiel. in XLPE insulation are about eight orders of magnitude greater than the losses occurring in semiconductor screens.

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Section: Introductionmentioning

confidence: 99%

“…In article [50], the authors, determining the financial costs that result from losses in cable insulation, focused only on losses in XLPE insulation. In article [52], the authors described the effect of semiconductor screens on losses in cables.…”

Section: Introductionmentioning

confidence: 99%

Electric Field Distribution and Dielectric Losses in XLPE Insulation and Semiconductor Screens of High-Voltage Cables

Nadolny

2022

Energies

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“…Energy efficiency in both high voltage alternating current (HVAC) and high voltage direct current (HVDC) transmission systems strictly depends on the cable design. One of the most important elements in a cable is the insulation layer [1][2][3]. For this reason, cable manufacturers are continuously testing dielectric materials that can provide the best performances [4,5].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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Modeling and simulation framework for techno-economic analysis of large city low-voltage distribution network

Zhang

Nair

Cross³

2015

2015 IEEE Innovative Smart Grid Technologies - Asia (ISGT ASIA)

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The techno-economic studies of distributed energy resources in the low-voltage (LV) distribution networks are mostly simulated on a few typical LV feeders, so the scalability issue of modeling and simulating a large part of LV networks in a large city is discussed. The proposed generic modeling framework has been implemented on a practical utility-scale LV network considering the LV network characteristics. The simulation platform is open source, which is customized and automated to assess the impact of rooftop photovoltaic (PV) integration. The framework can be expanded to assess the other Smart Grid technology options and to assist the localized asset investment policy decisions.

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Enhanced energy efficiency of underground cables

Cited by 3 publications

References 0 publications

Electric Field Distribution and Dielectric Losses in XLPE Insulation and Semiconductor Screens of High-Voltage Cables

Electric Field Distribution and Dielectric Losses in XLPE Insulation and Semiconductor Screens of High-Voltage Cables

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

Modeling and simulation framework for techno-economic analysis of large city low-voltage distribution network

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