Testing Submergible Power Cables for Oil Well Applications

1981 ◽  
Vol 54 (1) ◽  
pp. 51-60
Author(s):  
Jon W. Martin
Keyword(s):  
Electrical Properties ◽  
Field Testing ◽  
Power Cable ◽  
Oil Well ◽  
Power Cables ◽  
Degradation Mechanisms ◽  
Cable Insulation ◽  
Thermal Limits ◽  
The World

Abstract A downhole simulator can be used to test oil well power cable, providing results more quickly and economically than can be obtained from field testing. Electrical properties of the cable can be monitored durng the test. Thermal limits can be established. Field degradation mechanisms can be reproduced. TRW uses the facility to evaluate oil well cable designs and to test new cable insulation and protection materials. From this experience, submergible cables have been improved to meet the most severe downhole conditions being encountered throughout the world.

scholarly journals Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2591
Author(s):  
Diana Enescu ◽  
Pietro Colella ◽  
Angela Russo ◽  
Radu Florin Porumb ◽  
George Calin Seritan
Keyword(s):  
Computational Methods ◽  
Risk Estimation ◽  
Renewable Energy Sources ◽  
Thermal Conditions ◽  
Weather Conditions ◽  
Operating Conditions ◽  
International Standards ◽  
Power Cable ◽  
Power Cables ◽  
Thermal Limits

With the increase in the electrical load and the progressive introduction of power generation from intermittent renewable energy sources, the power line operating conditions are approaching the thermal limits. The definition of thermal limits variable in time has been addressed under the concept of dynamic thermal rating (DTR), with which it is possible to provide a more detailed assessment of the line rating and exploit the electrical system more flexibly. Most of the literature on DTR has addressed overhead lines exposed to different weather conditions. The interest in the dynamic thermal rating of power cables is increasing, considering the evolution of computational methods and advanced systems for cable monitoring. This paper contains an overview of the concepts and methods referring to dynamic cable rating (DCR). Starting from the analytical formulations developed many years ago for determining the power cable rating in steady-state conditions, also reported in International Standards, this paper considers the improvements of these formulations proposed during the years. These improvements are leading to include more specific details in the models used for DCR analysis and the computational methods used to assess the power cable’s thermal conditions buried in soil. This paper is focused on highlighting the path from the initial theories and models to the latest literature contributions. Attention is paid to thermal modelling with different levels of detail, applications of 2D and 3D solvers and simplified models, and their validation based on experimental measurements. A salient point of the overview is considering the DCR impact on reliability aspects, risk estimation, real-time calculations, forecasting, and planning with different time horizons.

scholarly journals Assessment of dielectric strength and partial discharges patterns in nanocomposites insulation of single-core power cables

2021 ◽  
Vol 11 (04) ◽  
pp. 2150022
Author(s):  
Ahmed Thabet ◽  
M. Fouad
Keyword(s):  
Dielectric Strength ◽  
Partial Discharges ◽  
Power Cable ◽  
Insulation Material ◽  
Power Cables ◽  
Cable Insulation ◽  
Electrical Stress ◽  
Different Shapes ◽  
Work Done ◽  
New Strategies

Nanoparticles succeeded to enhance the dielectric properties of industrial insulation but the presence of voids inside the power cable insulation still leads to formation high electrical stress inside power cable insulation material and collapse. In this paper, the dielectric strength of new design nanocomposites has been deduced as experimental work done to clarify the benefit of filling nanoparticles with different patterns inside dielectrics. Also, it has been studied the effect of electrical stress distribution in presence of air, water and copper impurities with different shapes (cylinder, sphere and ellipse) inside insulation of single core. In simulation model, it has been used finite element method (FEM) for estimating the electrostatic field distribution in power cable insulation. It has been applied new strategies of nanotechnology techniques for designing innovative polyvinyl chloride insulation materials by using nanocomposites and multi-nanocomposites. Finally, this research succeeded to remedy different partial discharges (PD) patterns according to using certain types and concentrations of nanoparticles.

scholarly journals Research on Cable Insulation Aging Under Acid-base Environment

2021 ◽  
Vol 261 ◽  
pp. 02053
Author(s):  
Jin Ming Guo ◽  
Fei Feng Wang
Keyword(s):  
Electrical Properties ◽  
Strong Acid ◽  
Power Cable ◽  
Insulation Material ◽  
Test Results ◽  
Cable Insulation ◽  
Alkaline Environment ◽  
Ph Values ◽  
Insulation Aging ◽  
Micro Morphology

In order to further study the effect of different degree of acidity and alkalinity on cable insulation aging, the aging condition of cable insulation was compared and analyzed under different pH values. The samples of cable insulation material slice and short cable were carried out the accelerated aging test, which were placed in the conditions of different pH values. And then the test results of micro morphology and electrical properties between the different samples were compared and analyzed after aging. According to the test results in this paper, the micro morphology of the cable insulation material slice would change differently under the aging conditions of different acidity and alkalinity, which indicated that the degree of oxidation degradation of insulation material aging was different from the different acidity and alkalinity conditions. In addition, both acid or alkaline environment would accelerate the aging of cable insulation and reduce the service life of cable, while strong acid and strong alkaline environment are more conducive to the formation of interpenetrating water tree in cable insulation material and cause the operation accident of power cable. Furthermore, the test results of electrical properties of short cable samples after aging showed that the aging degree of short cable samples was more serious in alkaline environment, and the decline of electrical properties was faster.

scholarly journals Polyethylene Nanocomposites for Power Cable Insulations

Polymers ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 24 ◽  
Author(s):  
Ilona Pleşa ◽  
Petru Noţingher ◽  
Cristina Stancu ◽  
Frank Wiesbrock ◽  
Sandra Schlögl
Keyword(s):  
Electrical Performance ◽  
Power Cable ◽  
Power Cables ◽  
Structure Property ◽  
Thermoplastic Polymers ◽  
Water Tree ◽  
Tree Resistance ◽  
Structure Property Relationships ◽  
Aging Mechanisms ◽  
Comprehensive Study

This review represents a comprehensive study of nanocomposites for power cables insulations based on thermoplastic polymers such as polyethylene congeners like LDPE, HDPE and XLPE, which is complemented by original results. Particular focus lies on the structure-property relationships of nanocomposites and the materials’ design with the corresponding electrical properties. The critical factors, which contribute to the degradation or improvement of the electrical performance of such cable insulations, are discussed in detail; in particular, properties such as electrical conductivity, relative permittivity, dielectric losses, partial discharges, space charge, electrical and water tree resistance behavior and electric breakdown of such nanocomposites based on thermoplastic polymers are described and referred to the composites’ structures. This review is motivated by the fact that the development of polymer nanocomposites for power cables insulation is based on understanding more closely the aging mechanisms and the behavior of nanocomposites under operating stresses.

Development of a Portable XLPE Cable Insulation Detection Device

2014 ◽  
Vol 960-961 ◽  
pp. 881-884
Author(s):  
Xiao Guang Xi ◽  
Yu Yan Man ◽  
Chi Zhang ◽  
Ming Lei Wu ◽  
Yan Wei Dong ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Electromagnetic Wave ◽  
Electromagnetic Coupling ◽  
Partial Discharge ◽  
Power Cables ◽  
Cable Insulation ◽  
Xlpe Cable ◽  
Insulation Status

In this article, a portable XLPE cable insulation detection device is introduced. Such a device utilizes electromagnetic coupling, UHF electromagnetic wave and acoustic emission to detect partial discharge signals in power cables. By analyzing the partial discharge signals and cable temperatures, the insulation status of XLPE power cables is judged.

Recent trends in import and export of Rudraksha beads in India

2018 ◽  
Vol 25 (4) ◽  
pp. 225-228
Author(s):  
Amar Nath Singh ◽  
Keyword(s):  
Electrical Properties ◽  
Present Article ◽  
High Demand ◽  
The World ◽  
Recent Trends ◽  
Import And Export ◽  
Prayer Beads ◽  
Religious Importance ◽  
Magnetic And Electrical Properties

The Rudraksha beads are traditionally used as prayer beads in Hinduism (especially Shaivism) throughout India. Apart from the religious importance, medicinal, bio-magnetic and electrical properties of the Rudraksha beads have also been reported. This commodity is in high demand from the devotees across the world. Therefore, this is in trade throughout the country and abroad. The recent trends in import and export of Rudraksha beads in India have been described in the present article, considering scant publications on this aspect.

scholarly journals Temperature Dependence of Mechanical, Electrical Properties and Crystal Structure of Polyethylene Blends for Cable Insulation

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1922 ◽  
Author(s):  
Lunzhi Li ◽  
Lisheng Zhong ◽  
Kai Zhang ◽  
Jinghui Gao ◽  
Man Xu
Keyword(s):  
High Temperature ◽  
Electrical Properties ◽  
Temperature Dependence ◽  
Elevated Temperatures ◽  
Breakdown Strength ◽  
Temperature Stability ◽  
Xrd Analysis ◽  
Insulation Material ◽  
Cable Insulation ◽  
Polyethylene Blends

There is a long-standing puzzle concerning whether polyethylene blends are a suitable substitution for cable-insulation-used crosslinking polyethylene (XLPE) especially at elevated temperatures. In this paper, we investigate temperature dependence of mechanical, electrical properties of blends with 70 wt % linear low density polyethylene (LLDPE) and 30 wt % high density polyethylene (HDPE) (abbreviated as 70 L-30 H). Our results show that the dielectric loss of 70 L-30 H is about an order of magnitude lower than XLPE, and the AC breakdown strength is 22% higher than XLPE at 90 °C. Moreover, the dynamic mechanical thermal analysis (DMA) measurement and hot set tests suggest that the blends shows optimal mechanical properties especially at high temperature with considerable temperature stability. Further scanning electron microscope (SEM) observation and X-ray diffraction (XRD) analysis uncover the reason for the excellent high temperature performance and temperature stability, which can be ascribed to the uniform fine-spherulite structure in 70 L-30 H blends with high crystallinity sustaining at high temperature. Therefore, our findings may enable the potential application of the blends as cable insulation material with higher thermal-endurance ability.

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