A New Model of AC Resistance in ACSR Conductors

Barrett, J.S.; Nigol, O.; Fehervari, C. J.; Findlay, R.D.

doi:10.1109/tpwrd.1986.4307951

Cited by 37 publications

(32 citation statements)

References 9 publications

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“…[5][6][7] It is also possible to say that improvement on the conductivity of the aluminium alloy provides a designer to design OPGW with smaller diameter and low unit weight. [5][6][7] It is also possible to say that improvement on the conductivity of the aluminium alloy provides a designer to design OPGW with smaller diameter and low unit weight.…”

Section: Resultsmentioning

confidence: 99%

Improving Short-Circuit Current Capacity, Resistance, and Breaking Load of OPGW Constructions by Modifying Aluminium Alloy With AlB₂

Karabay¹,

Tayşı²

2004

Materials and Manufacturing Processes

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This article presents a method that can be applied to molten AA-6101 alloy to improve electrical properties of the aluminium part of the optical ground wire (OPGW) used in overhead transmission lines to protect phase conductors from lightning strike and to transmit signals and data. AA-6101 alloy in casting of the log as 6 m length and 178 mm diameter for extrusion has been inoculated by AlB 2 to decrease detrimental effects of Cr, Ti, V, and Zr on the conductivity of the material. After inoculation, improved billets were extruded as 9.5 mm diameter feedstock. Required wires drawn from the feedstock according to the construction types of OPGW to be tested were exposed to aging at 175 C, 6 h (T-8). Upon completion of the back-twist and performing-type stranding process, resistance, and short-circuit current capacity and breaking load of the OPGW 88/44 constructions with other metal combinations have been examined and tested to show improvement. Results are summarized in tables and graphically.

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Section: Resultsmentioning

confidence: 99%

Improving Short-Circuit Current Capacity, Resistance, and Breaking Load of OPGW Constructions by Modifying Aluminium Alloy With AlB₂

Karabay¹,

Tayşı²

2004

Materials and Manufacturing Processes

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“…In order to obtain the value of , Equations (12), (13), and (14) are solved and the maximum value is considered i.e. max { , , , as recommended by IEEE Std 738-2012 [20].…”

Section: Thermal Modeling Of Overhead Conductorsmentioning

confidence: 99%

“…The reactive and active power losses are separately represented in Equation 20 20, consists of a real and an imaginary part [14] as follows:…”

Section: Modeling Of the Magnetic Effectsmentioning

confidence: 99%

“…While the magnetic effect can be neglected in AAC conductors due to the low relative permeability of the core, it is significant in ACSR conductors with an odd number of layers, especially the single-layer [13], [14]. Single-layer conductors are mainly used in distribution networks due to their lower current capacity, between 100A and 400A [15].…”

Section: Introductionmentioning

confidence: 99%

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A Three-Phase Weather-Dependent Power Flow Approach for 4-Wire Multi-Grounded Unbalanced Microgrids with Bare Overhead Conductors

Pompodakis¹

2020

Preprint

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<p><b>Conventional power flow (CPF) algorithms assume that the network resistances and reactances remain constant regardless of the weather and loading conditions. Although the impact of the weather in power flow analysis has been recently investigated via the weather-dependent power flow (WDPF) approaches, the magnetic effects in the core of ACSR conductors have not been explicitly considered. ACSR conductors are widely used in distribution networks. Therefore, this manuscript proposes a three-phase weather-dependent power flow algorithm for 4-wire multi-grounded unbalanced microgrids (MGs), which takes into consideration the impact of weather as well as the magnetic effects in the core of ACSR conductors. It is shown that the magnetic effects in the core can significantly influence the power flow results, especially for networks composed of single-layer ACSR conductors. Furthermore, the proposed algorithm explicitly considers the multi-grounded neutral conductor, thus it can precisely simulate unbalanced low voltage (LV) and medium voltage (MV) networks. In addition, the proposed approach is generic and can be applied in both grid-connected and islanded networks. Simulations conducted in a 25-Bus unbalanced LV microgrid highlight the accuracy and benefit of the proposed approach. </b></p>

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“…The magnetising effect is opposite in a two‐layer conductor and results in a small increase of the effective resistance. This effect is considerable in one‐layer conductors, moderate in three‐layer conductors, and it may be disregarded for five‐layer conductors and more . The exact calculation of this effect is difficult because the core magnetic properties and the exact layer lengths are generally not available.…”

Section: Steady‐state Heat Balancementioning

confidence: 99%

A proposed algorithm for an overhead transmission line conductor temperature rise calculation

Kotni

2012

Int. Trans. Electr. Energ. Syst.

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SUMMARYThe work carried out in this paper is to deal with a proposed conductor temperature rise computation algorithm. This simple algorithm gives more accurate calculation, making use of the load current and the weather data parameters, particularly the amount of solar incidental radiation upon the conductor and the conductor material properties. The calculation is based on the heat transfer mechanisms occurring in the stranded exposed overhead transmission lines (OHTL) conductors in a natural environment. In this paper, the mathematical models for the use of the natural and forced convections are presented by using Numbers of Grashof and Reynolds, respectively, in the determination of the temperature rise of the OHTLs. Skin effect and iron losses are also taken into account in order to determine the alternating current resistance of an Aluminium Conductor Steel Reinforced in the process of iteration's heat balance equation. The surface area factor of the stranded conductors that increases the loss by radiation from the conductor surface is also used to calculate the temperature rise of the stranded OHTL.

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A New Model of AC Resistance in ACSR Conductors

Cited by 37 publications

References 9 publications

Improving Short-Circuit Current Capacity, Resistance, and Breaking Load of OPGW Constructions by Modifying Aluminium Alloy With AlB₂

Improving Short-Circuit Current Capacity, Resistance, and Breaking Load of OPGW Constructions by Modifying Aluminium Alloy With AlB₂

A Three-Phase Weather-Dependent Power Flow Approach for 4-Wire Multi-Grounded Unbalanced Microgrids with Bare Overhead Conductors

A proposed algorithm for an overhead transmission line conductor temperature rise calculation

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A New Model of AC Resistance in ACSR Conductors

Cited by 37 publications

References 9 publications

Improving Short-Circuit Current Capacity, Resistance, and Breaking Load of OPGW Constructions by Modifying Aluminium Alloy With AlB2

Improving Short-Circuit Current Capacity, Resistance, and Breaking Load of OPGW Constructions by Modifying Aluminium Alloy With AlB2

A Three-Phase Weather-Dependent Power Flow Approach for 4-Wire Multi-Grounded Unbalanced Microgrids with Bare Overhead Conductors

A proposed algorithm for an overhead transmission line conductor temperature rise calculation

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Improving Short-Circuit Current Capacity, Resistance, and Breaking Load of OPGW Constructions by Modifying Aluminium Alloy With AlB₂

Improving Short-Circuit Current Capacity, Resistance, and Breaking Load of OPGW Constructions by Modifying Aluminium Alloy With AlB₂