A Discussion on recent advances in heavy electrical plant - Underground power cables

1973 ◽  
Vol 275 (1248) ◽  
pp. 193-203 ◽  
Keyword(s):  
Power Transmission ◽  
Power Cable ◽  
Power Cables ◽  
Cable System ◽  
Insulating Materials ◽  
Cable Systems ◽  
Underground Power Cable ◽  
Underground Power Cables ◽  
Near Future ◽  
Further Development

Up to the present, effectively all underground power transmission needs have been satisfied by the use of conductors insulated with impregnated paper. In particular, in recent years, the oil-filled cable system using cellulose paper impregnated with oil under pressure has been further developed to meet all immediate and near future needs for higher voltage and higher current power transmission underground. With modem materials and technology, are there more economical solutions and can the needs of the longer future term be met? The basic electrical, thermal, mechanical and reliability constraints which are exerted upon the design of supertension underground power cable systems are considered. The limitations upon further development of the oil-filled cable system are identified. Also, indications are given of the potentials of new insulating materials and novel constructions of cable to provide more economical solutions and greater power transmission capabilities.

scholarly journals Analysis of an application possibility of geopolymer materials as thermal backfill for underground power cable system

2020 ◽  
Author(s):  
Paweł Ocłoń ◽  
Piotr Cisek ◽  
Marcelina Matysiak
Keyword(s):  
Thermal Conductivity ◽  
Economic Benefits ◽  
Environmental Benefits ◽  
Power Cable ◽  
Closed Cycle ◽  
Cable System ◽  
Material Costs ◽  
Cable Systems ◽  
Underground Power Cable ◽  
By Products

Abstract The circular economy is a closed cycle that allows one to reuse the industrial waste, as well as minimize the energy and resources losses during the production process. This paper presents an innovative idea of the application of a geopolymer cable backfill for underground power cable system installation. The closed cycle, in this case, is formulated as follows: the primary resource is the waste from the combustion of fossil fuels, i.e., fly ash that is utilized to form the geopolymer matrix. The geopolymer then is used as thermal backfill in underground power cable systems. Utilization of combustion by-products in the form of a geopolymer is a highly profitable solution since landfill waste disposal, in this case, generates considerable costs for the electrical energy producers. In typical applications, geopolymers are used as insulators. By adding individual components, the thermal conductivity of 2.0 W/(m K), higher than of typical thermal backfills (Fluidized Thermal Backfill), which value is close to 1.5 W/(m K), is reached. What is very important, geopolymers can absorb water better than typical sand–cement mixtures. As a result, a high thermal conductivity with the temperature increase is maintained. The application of geopolymers as thermal backfills has the potential to improve the flexibility of underground power cable systems, as well as to minimize the material costs of installation. The case study is presented to show the economic benefits of using the combustion by-products as a geopolymer thermal backfill. The finite element method model of an underground power cable system is developed, and optimization of backfill dimensions is provided to minimize the material costs using the geopolymer thermal backfill and to maximize the underground power cable system performance. The main result of this paper is that the application of geopolymers leads to a decrease in underground power cable system costs, compared to traditional backfill (sand–cement mixture). The reason is the higher value of thermal conductivity, which allows selecting a cable with a smaller cross-sectional area. Also, the environmental benefits of geopolymer application for cable bedding are discussed. Graphic abstract

Underground Power Cable Construction

2016 ◽  
pp. 1-34
Keyword(s):  
Electric Energy ◽  
Power Cable ◽  
Power Cables ◽  
Underground Cables ◽  
Different Types ◽  
Materials Used ◽  
Underground Power Cable ◽  
Underground Power Cables ◽  
Transmission And Distribution

This chapter deals with many special features of underground power cables. Important points are presented in this chapter. In this chapter the various components of the different underground cables used in transmission and distribution of electric energy are explained. The materials used in the manufacture of these cables are given in details. This chapter also contains the different types of cable joints and terminations.

scholarly journals Experimental Validation of a Heat Transfer Model in Underground Power Cable Systems

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1747 ◽  
Author(s):  
Paweł Ocłoń ◽  
Janusz Pobędza ◽  
Paweł Walczak ◽  
Piotr Cisek ◽  
Andrea Vallati
Keyword(s):  
Experimental Validation ◽  
Thermal Conditions ◽  
Test Stand ◽  
Temperature Fields ◽  
Transfer Model ◽  
Power Cable ◽  
Power Cables ◽  
Temperature Changes ◽  
Steady State Temperature ◽  
Underground Power Cable

This paper presents the laboratory test stand that is used for experimental validation of underground power cable system models. Determination of temperature distribution in the vicinity of the cable is the main goal of the study. The paper considers a system of three power cables, situated in the in-line arrangement, and buried in sand. Three electrical heaters of special construction are used in order to simulate the heat flux that is generated in the power cables during their operation. The test stand is designed to be placed in a thermoclimatic chamber, which allows testing the system in various thermal conditions when the ambient temperature changes by 20 °C to 30 °C. Numerical computations of the steady-state temperature fields are performed using the finite element method.

Devices Used in Corrosion Control of Power Cables

CORROSION ◽  
1961 ◽  
Vol 17 (6) ◽  
pp. 300t-304t
Author(s):  
J. J. POKORNY
Keyword(s):  
Corrosion Protection ◽  
Cathodic Protection ◽  
Power Cables ◽  
Corrosion Control ◽  
Cable System ◽  
Long Time ◽  
Power Rectifier ◽  
Underground Power Cables ◽  
Test Current

Abstract This paper describes the various devices which are used in the corrosion control of underground power cables. Many of these devices have been used for a long time but the present paper describes a number of useful improvements in such devices as the electrolysis switch, the test current interrupter, and the cathodic protection and forced drainage rectifiers. The use of silicon power rectifier as an electrolysis switch is described. A method of grounding and corrosion protection of a pipe cable system is also outlined. 7.7, 5.2.1

Characteristics and Reduction of Sheath Circulating Currents in Underground Power Cable Systems

2004 ◽  
Vol 1 (1) ◽  
Author(s):  
C.K. Jung ◽  
J.B. Lee ◽  
J.W. Kang ◽  
Xinheng Wang ◽  
Yong-Hua Song
Keyword(s):  
Transmission System ◽  
Power Cable ◽  
Special Equipment ◽  
Transmission Systems ◽  
Circulating Current ◽  
Cable Systems ◽  
Underground Power Cable ◽  
Formation System ◽  
Circulating Currents

Sheath current can cause sheath loss and reduce the permissible current of a power cable transmission system. High sheath current is usually caused by mixed cable burying formation, different length between sections, poor connection of the bonding leads, and connection of distribution cable onto transmission systems. This paper analyses the characteristics of sheath circulating current at various conditions and presents a useful method to reduce it in a mixed burying formation system. It can effectively reduce the current by up to 90%. The method is validated by practical measurements and simulations using ATP, and has been implemented in actual systems. In addition, a special equipment is designed to measure and analyze the sheath circulating current. It can measure and analyze nine currents at a same time.

scholarly journals The performance analysis of a new thermal backfill material for underground power cable system

2016 ◽  
Vol 108 ◽  
pp. 233-250 ◽  
Author(s):  
Paweł Ocłoń ◽  
Marco Bittelli ◽  
Piotr Cisek ◽  
Eva Kroener ◽  
Marcin Pilarczyk ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Power Cable ◽  
Cable System ◽  
Backfill Material ◽  
Underground Power Cable

scholarly journals Evolution of Temperature Field around Underground Power Cable for Static and Cyclic Heating

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 8191
Author(s):  
Shahbaz Ahmad ◽  
Zarghaam Haider Rizvi ◽  
Joan Chetam Christine Arp ◽  
Frank Wuttke ◽  
Vineet Tirth ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Weather Conditions ◽  
Nonlinear Dependence ◽  
Transfer Model ◽  
Power Cable ◽  
Cable Systems ◽  
Underground Power Cable

Power transmission covering long-distances has shifted from overhead high voltage cables to underground power cable systems due to numerous failures under severe weather conditions and electromagnetic pollution. The underground power cable systems are limited by the melting point of the insulator around the conductor, which depends on the surrounding soils’ heat transfer capacity or the thermal conductivity. In the past, numerical and theoretical studies have been conducted based on the mechanistic heat and mass transfer model. However, limited experimental evidence has been provided. Therefore, in this study, we performed a series of experiments for static and cyclic thermal loads with a cylindrical heater embedded in the sand. The results suggest thermal charging of the surrounding dry sand and natural convection within the wet sand. A comparison of heat transfer for dry, unsaturated and fully saturated sand is presented with graphs and colour maps which provide valuable information and insight of heat and mass transfer around an underground power cable. Furthermore, the measurements of thermal conductivity against density, moisture and temperature are presented showing positive nonlinear dependence.

scholarly journals A statistical method for stastical appraisal of the power cable conditions based on the TD and PD diagsnostics result

2019 ◽  
Vol 124 ◽  
pp. 02014
Author(s):  
T. Neier ◽  
J. Knauel ◽  
M. Bawart ◽  
D. Antipov ◽  
S. Kim
Keyword(s):  
Life Time ◽  
Distribution Networks ◽  
Power Cable ◽  
Practical Case ◽  
Power Cables ◽  
Remaining Life ◽  
Power Utilities ◽  
Underground Power Cables ◽  
Asset Managers

This study handles one of the key questions of network operators: How can the remaining life time of underground power cables be estimated? The answer to this question is explained by a new method of KEPCO Korea. When combining VLF Tan Delta (TD) and Partial Discharge (PD) diagnostic it is possible to identify and localize weak individual spots along a cable. After weak spots are cleared, the general aging condition of the cable can be evaluated and the Remaining Life Time can be estimated. The implementation of this approach in the KEPCO Distribution Networks is illustrated in a practical case study. A new tool for asset managers is available and it is expected that it will help to further develop the preventive maintenance approach by power utilities all around the world.

Thermal performance optimization of the underground power cable system by using a modified Jaya algorithm

2018 ◽  
Vol 123 ◽  
pp. 162-180 ◽  
Author(s):  
Paweł Ocłoń ◽  
Piotr Cisek ◽  
Monika Rerak ◽  
Dawid Taler ◽  
R. Venkata Rao ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Performance Optimization ◽  
Power Cable ◽  
Jaya Algorithm ◽  
Cable System ◽  
Underground Power Cable
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