Skin and proximity effects in the series-impedance of three-phase underground cables

2016 ◽  
Vol 130 ◽  
pp. 132-138 ◽  
Author(s):  
Ana Isabel Brito ◽  
V. Maló Machado ◽  
M.E. Almeida ◽  
M. Guerreiro das Neves
Keyword(s):  
Proximity Effects ◽  
Underground Cables ◽  
Three Phase ◽  
Series Impedance

scholarly journals Time-Series Temperature-Dependent Power Flow Considering Unbalanced Thermoelectric Equivalent Circuits for Underground LV and MV Cables

2021 ◽  
Author(s):  
Evangelos Pompodakis ◽  
Andreas I. Chrysochos ◽  
Arif Ahmed ◽  
Minas C. Alexiadis
Keyword(s):  
Time Series ◽  
Power Flow ◽  
Low Voltage ◽  
Distribution Networks ◽  
Temperature Dependent ◽  
Underground Cables ◽  
Thermal Circuit ◽  
Three Phase ◽  
Homogeneous Soil ◽  
Conductor Temperature

<p>This manuscript proposes a time-series temperature-dependent power flow method for unbalanced distribution networks consisting of underground cables. A thermal circuit model for unbalanced three-phase multi-core cables is developed to estimate the conductor temperature and resistance of Medium and Low Voltage distribution networks. More specifically, a novel approach is proposed to model and estimate the parameters of the three-phase thermal circuit of 3/4-core cables, using the results of Finite Element Method and Particle Swarm Optimization. The proposed approach is generic and can be accurately applied to any kind of 3- or 4-core cables buried in homogeneous or non-homogeneous soil. Furthermore, it is applicable in cases where one or more adjacent cables exist. Using the proposed approach, the conductor temperature of each phase can be individually and precisely calculated even in networks with highly unbalanced loads. The proposed approach is expected to be an important tool for simulating the steady state of unbalanced distribution networks and estimating the conductor temperatures. The proposed thermal circuit is validated using two 4-core LV and one 3-core MV cables buried in different depths in homogeneous or non-homogeneous soil. Time-series power flow for a whole year is performed in a 25-bus unbalanced LV network consisting of multicore underground cables.</p>

scholarly journals Determination of the Operating Temperature of the Gas-Insulated Transmission Line

2020 ◽  
Vol 10 (24) ◽  
pp. 8877
Author(s):  
Tomasz Szczegielniak ◽  
Dariusz Kusiak ◽  
Paweł Jabłoński
Keyword(s):  
Power Transmission ◽  
Radiation Heat Transfer ◽  
Proximity Effects ◽  
High Current ◽  
Power Losses ◽  
Factors Affecting ◽  
Three Phase ◽  
Phase Conductors ◽  
High Power Transmission

Gas-insulated lines (GILs) have been increasingly used as high-current busducts for high-power transmission. Temperature is one of the most important factors affecting the performance and ampacity of GILs. In this paper, an analytical method was proposed to determine the temperature of a three-phase high-current busduct in the form of a single pole GIL. First, power losses in the phase conductors and enclosures were determined analytically with the skin, and proximity effects were taken into account. The determined power losses were used as heat sources in thermal analysis. Considering the natural convection and radiation heat transfer effects, the heat balance equations on the surface of the phase conductors and the screens were established, respectively. Subsequently, the temperature of the phase conductors and the enclosures were determined. The validation of the proposed method was carried out using the finite element method and laboratory measurements.

scholarly journals The Magnetic Field and Impedances in Three-Phase Rectangular Busbars with a Finite Length

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1419
Author(s):  
Kusiak
Keyword(s):  
Magnetic Field ◽  
Finite Length ◽  
Analytical Method ◽  
Proximity Effects ◽  
Phase System ◽  
High Current ◽  
Three Phase ◽  
The Magnetic Field

The paper presents an analytical method for calculating impedances of rectangular bus ducts. The method is based on the partial inductance theory—in particular, the impedance of rectangular busbars in a three-phase system with a neutral conductor is described. The results of resistances and reactances of these systems of multiple rectangular conductors were obtained. Skin and proximity effects were taken into account. The measurements of the impedance of shielded and unshielded high-current busducts of rectangular conductors were also carried out. The magnetic field of the busbars was determined with several methods.

Assessment of Series Compensator for Ferroresonance Damping in Power System

2016 ◽  
Vol 818 ◽  
pp. 101-105
Author(s):  
Amir Hesam Khavari ◽  
Zulkurnain Abdul-Malek ◽  
Chin Leong Wooi
Keyword(s):  
Power System ◽  
Power Quality ◽  
Critical Issue ◽  
Capacitive Coupling ◽  
General Idea ◽  
Power Transformers ◽  
Underground Cables ◽  
Three Phase ◽  
Non Linear ◽  
Static Synchronous Series Compensator

Nowadays power quality is a critical issue in power system. Moreover the connection of three-phase transformers through underground cables is growing fast in residential, commercial, industrial and rural applications. Due to this increasing situation, the possibilities of having a series connected capacitance and a non-linear inductance, and hence ferroresonance, become more probable. Ferroresonance can also occur in power transformers or reactors by capacitive coupling from neighbouring phases or lines. It is necessary to have a general idea about what would be the best preventive decisions to take in order to avoid unexpected surprises. It is necessary to have an accurate ferroresonance model so that a device that can smoothen the sharp effects of ferroresonance can be found. In this paper, the FACTS device, namely the static synchronous series compensator (SSSC) had been used to mitigate ferroresonance. Results show that using SSSC dramatically decreases and mitigates the ferroresonance shock as well as the instabilities of the network.

Assessment of Series Compensator for Ferroresonance Damping in Power System

2016 ◽  
Vol 818 ◽  
pp. 74-78 ◽  
Author(s):  
Zulkurnain Abdul-Malek ◽  
Amir Hesam Khavari ◽  
Mehdi Moradi ◽  
Chin Leong Wooi
Keyword(s):  
Power System ◽  
Power Quality ◽  
Critical Issue ◽  
Capacitive Coupling ◽  
General Idea ◽  
Power Transformers ◽  
Underground Cables ◽  
Three Phase ◽  
Non Linear ◽  
Static Synchronous Series Compensator

Nowadays power quality is a critical issue in power system. Moreover the connection of three-phase transformers through underground cables is growing fast in residential, commercial, industrial and rural applications. Due to this increasing situation, the possibilities of having a series connected capacitance and a non-linear inductance, and hence ferroresonance, become more probable. Ferroresonance can also occur in power transformers or reactors by capacitive coupling from neighbouring phases or lines. It is necessary to have a general idea about what would be the best preventive decisions to take in order to avoid unexpected surprises. It is necessary to have an accurate ferroresonance model so that a device that can smoothen the sharp effects of ferroresonance can be found. In this paper, the FACTS device, namely the static synchronous series compensator (SSSC) had been used to mitigate ferroresonance. Results show that using SSSC dramatically decreases and mitigates the ferroresonance shock as well as the instabilities of the network.

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