Analysis of Construction Points of 10kV Power Cable Line

2021 ◽  
Keyword(s):  
Power Cable ◽  
Cable Line

Analysis and calculation the thermal stress and short circuit force of the power cable line

2014 ◽  
Author(s):  
Zhen-peng Zhang ◽  
Nai-qiu Shu ◽  
Jian-kang Zhao ◽  
Wen-bin Rao ◽  
Shao-xin Meng ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Short Circuit ◽  
Power Cable ◽  
Cable Line

scholarly journals THE DISTRIBUTION OF MAGNETIC AND THERMAL FIELDS, POWER LOSSES IN ELECTROMAGNETIC SHIELD OF UNDERGROUND TWO-CIRCUIT CABLE LINE

2021 ◽  
Vol 2021 (60) ◽  
pp. 12-21
Author(s):  
I.M. Kucheriava ◽  
Keyword(s):  
Maximum Temperature ◽  
Power Cable ◽  
Cable Line ◽  
Thermal Fields ◽  
Operating Current ◽  
Electromagnetic Shield ◽  
Electromagnetic Characteristics ◽  
Extra High Voltage ◽  
The Magnetic Field ◽  
Lower Heating

In the article, the magnetic and thermal field distributions generated by underground two-circuit extra-high voltage power cable line in the environment, particularly near the cables and flat aluminum shield, which is located at a different distance from the cables and has different thicknesses, are analyzed. The unique features of the magnetic field and temperature distributions inside the shield are computed and studied. For the cases under consideration, the Joule losses in the external shield do not exceed 3% of the losses in the cables. The primary electromagnetic characteristics are compared for the aluminum shield (shielding efficiency is 1,94) and the shield with lower conductivity (shielding efficiency is equal to 1,2). As shown, the thicker shield helps to increase the ampacity of the cable line owing to lower heating. The actual operating current of the cable line under consideration depends on the distance of the shield from the cables owing to the relation between their maximum temperature and this distance. Ref. 15, fig. 7, table.

scholarly journals Modeling the reliability of electrical power lines of the seaport in conditions forced electricity consumption

2021 ◽  
pp. 121-127
Author(s):  
А.П. Лицкевич ◽  
С.А. Лицкевич ◽  
О.Н. Лицкевич
Keyword(s):  
Mathematical Model ◽  
Technological Process ◽  
Operating Time ◽  
Electricity Consumption ◽  
Arbitrary Point ◽  
Power Line ◽  
Operating Conditions ◽  
Power Lines ◽  
Power Cable ◽  
Cable Line

В работе рассматривается задача оценки времени наработки силовой кабельной линии морского порта, с учетом форсирования технологического процесса в морском порту (погрузочно-разгрузочных работ) и, в связи с этим, повышения величины токовой нагрузки в силовой линии, превышающей допустимый предел, что ведет к повреждению линии. Для оценки влияния форсированного технологического процесса, на наработку силовых линий, вводятся основные факторы влияния: время длительности форсированного режима; величина тока в линии; температура окружающей среды. С их помощью вводится функция сокращающегося временного ресурса наработки силовой линии, которая отображает повреждения в силовой линии. Общая математическая модель наработки силовой кабельной линии включает повреждения в кабельной линии как основной фактор. Решение задач осуществляется с помощь разработанных программных средств и применения нечеткой математики, в среде Mathcad. Представленная математическая модель позволяет количественно оценить время наработки при использовании форсированных технологических режимов и повышенного потребления энергии, а также оценить степень снижения времени наработки, в результате суммарного действия повреждающих факторов, для произвольного момента времени в условиях эксплуатации. The paper considers the problem of estimating the operating time of the power, cable line of the seaport, taking into account the acceleration of the technological process in the seaport (loading and unloading operations) and, in this regard, the increase in the current load in the power line exceeding the permissible limit, which leads to damage lines. To assess the influence of the forced technological process on the operating time of the power lines, the main factors of influence are introduced: the duration of the forced mode; line current value; ambient temperature. With their help, the function of reducing the time resource of the operating time of the power line is introduced, which displays the damage in the power line). The general mathematical model of the power cable line operating time includes damage in the cable line as the main factor. The solution of problems is carried out with the help of the developed software and the use of fuzzy mathematics, in the Mathcad environment. The presented mathematical model makes it possible to quantitatively evaluate the operating time when using forced technological modes and increased energy consumption, as well as to assess the degree of reduction in the operating time, as a result of the total action of damaging factors, for an arbitrary point in time under operating conditions.

Optimization the Arrangement of Power Cable Lines in Tunnel

2014 ◽  
Vol 678 ◽  
pp. 513-517
Author(s):  
Guang Hua He ◽  
Zhen Peng Zhang ◽  
Min Sheng Xie ◽  
Ying Xiong Wu ◽  
Dong Xing Yang ◽  
...  
Keyword(s):  
Short Circuit ◽  
Short Circuit Current ◽  
Layout Design ◽  
Power Cable ◽  
Cable Line ◽  
Force Peak ◽  
Cable Lines ◽  
Better Than ◽  
Peak Value

In order to optimized the power cable layout design in tunnel, and improved the operation ability of the cable line, this paper analyzed the cable rating and the short-circuit force under different arrangements. 220kV cable circuit was simulated in the tunnel with conditions of the flat and the trefoil arrangements. The temperature and the rating of the 220kV cable under the condition of the two arrangements were calculated in this paper. The short circuit force peak value and its direction of the cable line under short circuit current of 50kA under the condition of the two arrangements were simulated in this paper. The results show that, the cable rating in flat arrangement is better than in trefoil formation. The value and the direction of the short circuit force in tunnel are better in flat arrangement than in trefoil formation. So it is suggested that the flat arrangement is preferred when conditions permit.

scholarly journals Analysis of Overvoltages Appearing in One-Sidedly Ungrounded MV Power Cable Screen

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1821 ◽  
Author(s):  
Aleksandra Schött-Szymczak ◽  
Krzysztof Walczak
Keyword(s):  
Single Phase ◽  
Field Studies ◽  
Power Cable ◽  
Cable Line ◽  
Medium Voltage ◽  
Ground Fault ◽  
Actual Outcome ◽  
Connection Type ◽  
Overvoltage Protection ◽  
Line Work

Changing the connection type of a medium voltage (MV) cable screen is linked to a decrease in power loss, although it may also lead to the generation of overvoltage in a metallic cable screen, which is hazardous for proper cable line work. In this paper, results of simulation and field researches are presented, showing the range of voltages that occurs in cable screens during single-phase ground fault. There are considered to be three scenarios according to the applied type of cable screen connection. Conducted researches allow the comparison of chosen methods of simulation with an actual outcome. Results obtained during simulation and field studies lead to the conclusion that the range of overvoltage occurred in a cable screen could in fact be dangerous for the cable line’s sheath insulation without proper overvoltage protection.

Innovative calculation methods of the magnetic field from single and double-circuit twisted three-phase cables widely used in MV and LV installations

2012 ◽  
Vol 2 (2) ◽  
Author(s):  
Giovanni Mazzanti ◽  
Marco Landini ◽  
Effrosyni Kandia ◽  
Cesare Biserni ◽  
Massimo Marzinotto
Keyword(s):  
Magnetic Field ◽  
Power Distribution ◽  
Approximate Expression ◽  
Power Cable ◽  
Cable Line ◽  
Worst Case ◽  
Medium Voltage ◽  
Three Phase ◽  
Worst Case Approach ◽  
The Magnetic Field

AbstractThis paper proposes a simple innovative formula for the calculation of the magnetic field generated by a single and a double circuit twisted three-phase power cable line. The formula results a good approximation of the rigorous analytical one and at the same time is much more accurate than the approximated formula found in literature, as demonstrated by some cases of a twisted three-phase power cable used for power distribution at the medium voltage level. The effectiveness of this simple innovative formula is also examined in the case of a double-circuit twisted three-phase power cable line following the’ worst case’ approach and concluding at proposing an approximate expression for the total magnetic field generated by both twisted three-phase power cables.

scholarly journals Safety Issues Referred to Induced Sheath Voltages in High-Voltage Power Cables—Case Study

2020 ◽  
Vol 10 (19) ◽  
pp. 6706
Author(s):  
Stanislaw Czapp ◽  
Krzysztof Dobrzynski
Keyword(s):  
High Voltage ◽  
Electric Shock ◽  
Short Circuit ◽  
Single Point ◽  
Power Cable ◽  
Power Cables ◽  
Power Losses ◽  
Cable Line ◽  
Low Level

Load currents and short-circuit currents in high-voltage power cable lines are sources of the induced voltages in the power cables’ concentric metallic sheaths. When power cables operate with single-point bonding, which is the simplest bonding arrangement, these induced voltages may introduce an electric shock hazard or may lead to damage of the cables’ outer non-metallic sheaths at the unearthed end of the power cable line. To avoid these aforementioned hazards, both-ends bonding of metallic sheaths is implemented but, unfortunately, it leads to increased power losses in the power cable line, due to the currents circulating through the sheaths. A remedy for the circulating currents is cross bonding—the most advanced bonding solution. Each solution has advantages and disadvantages. In practice, the decision referred to its selection should be preceded by a wide analysis. This paper presents a case study of the induced sheath voltages in a specific 110 kV power cable line. This power cable line is a specific one, due to the relatively low level of transferred power, much lower than the one resulting from the current-carrying capacity of the cables. In such a line, the induced voltages in normal operating conditions are on a very low level. Thus, no electric shock hazard exists and for this reason, the simplest arrangement—single-point bonding—was initially recommended at the project stage. However, a more advanced computer-based investigation has shown that in the case of the short-circuit conditions, induced voltages for this arrangement are at an unacceptably high level and risk of the outer non-metallic sheaths damage occurs. Moreover, the induced voltages during short circuits are unacceptable in some sections of the cable line even for both-ends bonding and cross bonding. The computer simulations enable to propose a simple practical solution for limiting these voltages. Recommended configurations of this power cable line—from the point of view of the induced sheath voltages and power losses—are indicated.

scholarly journals MAGNETIC FIELD SHIELDING OF UNDERGROUND POWER CABLE LINE BY H-SHAPED SHIELD

2020 ◽  
Vol 2020 (6) ◽  
pp. 15-20
Author(s):  
I.M. Kucheriava ◽  
Keyword(s):  
Magnetic Field ◽  
Low Carbon Steel ◽  
Power Cable ◽  
Low Carbon ◽  
Shielding Effectiveness ◽  
Cable Line ◽  
Three Phase ◽  
Underground Power Cable ◽  
Extra High Voltage ◽  
The Magnetic Field

In the article the magnetic field distributions, generated by underground extra-high voltage (330 kV) three-phase power cable line in the environment, in particular near the cables in the trench and on the ground, are analyzed for using of H-shaped shield made of different materials including aluminum, low carbon steel and non-oriented grain steel. As shown, the best shielding effectiveness is realized by aluminium shield. The H-shaped shield made of high-conducting non-magnetic materials is proposed to use in order to mitigate the magnetic field level on the ground down to regulated nonhazardous values. References 14, figures 7.

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