Determination of minimum air clearances for a 420kV novel unibody composite cross-arm

Jahangiri, Tohid; Bak, Claus Leth; Silva, Filipe Miguel Faria da; Endahl, Brian

doi:10.1109/upec.2015.7339949

Cited by 9 publications

(5 citation statements)

References 1 publication

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“…Meanwhile, clamps are mounted on the cross-arms, and Aluminum Conductor Steel-Reinforced (ACSR) conductors in a duplex bundle are used. According to IEC 60071-1 [13] and CIGRE TB.72 [14], the required phase-to-phase and phase-to-shield wire air clearances on the unibody cross-arm are 3.68 m and 2.8 m, respectively [15]. Two separated bare conductors connected with the shielding wires are arranged through the pylon cross-arm and body.…”

Section: ⅱ Pylon Model Buildmentioning

confidence: 99%

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The Design and Optimization of the Down-Lead System for a Novel 400 kV Composite Pylon

Yin

Ghomi

Zhang

et al. 2023

IEEE Trans. Power Delivery

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Section: ⅱ Pylon Model Buildmentioning

confidence: 99%

“…The corresponding probability of each T f is f(T f )ΔT. Finally, the total BFR considering T f range can be obtained (15).…”

Section: G Bfr Calculationmentioning

confidence: 99%

The Design and Optimization of the Down-Lead System for a Novel 400 kV Composite Pylon

Yin

Ghomi

Zhang

et al. 2023

IEEE Trans. Power Delivery

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“…Two shield wires are mounted on the tip of cross-arms, and each cross-arm holds three two-bundle conductors. The interval between phase conductors and upper phase conductor to shield wire are 3.4 m and 2.8 m, respectively [13]. Two bare conductors with radii of 1.75 cm going through the two cross-arms are connected together with the steel mast.…”

Section: Tower Structurementioning

confidence: 99%

The effect of frequency-dependent soil electrical parameters on the lightning response of a ‘Y’ shaped composite pylon for 400 kV transmission lines

et al. 2022

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“…In recent years, usage of overhead lines in transmission system has been faced with great challenges, because of the increasing requirement for transmission capacity along with the public opposing to erect more conventional metal lattice towers, which have negative visual impact. A proposal for a fully composite pylon has been designed to meet the requirements of compact structure and elegant appearance for newgeneration transmission towers, which has the advantages of saving lines corridors and reducing visual impact [1]. The fully composite pylon is in the shape of a 'Y' geometric configuration, shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Transient modelling and backflashover rate analysis of a fully composite pylon

Zhang¹,

Wang²,

Yin³

et al. 2021

IET Conf. Proc.

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A proposal for a fully composite pylon has been designed to meet the requirements of compact structure and elegant appearance for new-generation 400 kV transmission towers, able to save lines corridors and reduce visual impact. Correspondingly, a method of external down-lead has been proposed to bring grounding potential to the shield wires. Based on this design, in this paper, lightning overvoltage level of the fully composite pylon is investigated by using transient simulation tools and backflashover performance is evaluated through Monte Carlo method. An equivalent distributed parameter model of the pylon is established, with the stray capacitances of phase conductors calculated in advance. Monte Carlo method is used to simulate the randomness of lightning current waveform in the nature. The overvoltage levels are simulated in PSCAD to determine the occurrence of backflashover. The backflashover rate (BFOR) is estimated by accumulate the probability of backflashover after repeated random sampling of lightning current. Simulating results show that the BFOR is 0.074 flashes/100 km•year and the overvoltage level calculated becomes lower in the modified model considering stray capacitances. Effects of both the lightning peak current and the tail time on the probability of backflashover occurrence is also summarized.

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Determination of minimum air clearances for a 420kV novel unibody composite cross-arm

Cited by 9 publications

References 1 publication

The Design and Optimization of the Down-Lead System for a Novel 400 kV Composite Pylon

The Design and Optimization of the Down-Lead System for a Novel 400 kV Composite Pylon

The effect of frequency-dependent soil electrical parameters on the lightning response of a ‘Y’ shaped composite pylon for 400 kV transmission lines

Transient modelling and backflashover rate analysis of a fully composite pylon

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