Field validation of gap-type overhead conductor creep

Fernández, E.; Albizu, I.; Bedialauneta, Miren T.; Mazón, A.J.; Etxegarai, A.

doi:10.1016/j.ijepes.2018.09.006

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…The high operating temperatures of overhead conductors result in the increase of sag. When the sag exceeds the maximum allowable value, occasional blackout accidents occur in the overhead conductors [2][3][4]. Thus, to prevent excessive sag occurring in operating overhead conductors, it is essential to understand and accurately calculate the sag-temperature behaviour for reserving adequate safety margin in the overhead line design [5].…”

Section: Introductionmentioning

confidence: 99%

Investigation of sag behaviour for aluminium conductor steel reinforced considering tensile stress distribution

et al. 2021

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Sag calculation plays an important role in overhead line design. Since the tensile stress of aluminium conductor steel reinforced (ACSR) is required for the sag calculation, an analysis on sag behaviour when considering the tensile stress distribution can be very useful to improve the accuracy of sag results. First, this paper analyses the ACSR tensile stress distribution arising from the temperature maldistribution through proposing a new calculation formula. A finite-element analysis (FEA) model of ACSR is conducted for the solution of the new formula. By using the results, the error and limitations of the existing sag calculation methods for ACSR are discussed. As the critical point of sag calculation, knee-point temperature is solved iteratively involving the tensile stress maldistribution phenomenon in aluminium wires. Based on this iterative solution, an improved analytical method for the ACSR sag calculation considering the creep effect is presented and also compared with the hybrid sag method. The results show that these two methods are basically coincident without the consideration of creep effect, while there are non-negligible differences between them as the creep strain is involved. Compared with the existing analytical methods, the improved sag calculation method proposed in this paper can be applied in more extensive situations.

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Section: Introductionmentioning

confidence: 99%

Investigation of sag behaviour for aluminium conductor steel reinforced considering tensile stress distribution

et al. 2021

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“…In the installation methodology [14] of gap-type conductors, the aluminium is left slack during the installation of the conductor; therefore, the KPT of the conductor is considered the installation temperature. As a result, the gap-type conductor works similar to a low-sag conductor above the installation temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Among the different types of HTLS conductors, one of the most widely used is the gap‐type conductor, which consists of a steel core and aluminium outer strands. A gap that exists between the steel and aluminium layers ensures that the aluminium layers remain slack during the conductor installation process [14].…”

Section: Introductionmentioning

confidence: 99%

Sag‐tension evaluation of high‐temperature gap‐type conductor in operation

Bedialauneta

Fernández

Albizu

et al. 2021

IET Generation Trans & Dist

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Low-sag conductors are characterised by their ability to operate above the "knee-point temperature" (KPT). Sag-tension performance must be calculated while designing a new overhead line. The ampacity limit of the conductor is influenced by the sag and the temperature of the conductor. The maximum sag must be limited to a certain value to ensure a safe clearance between the conductor and ground. In this study, a gap-type conductor in operation was monitored to evaluate the actual KPT. The KPT in low-sag conductors is a crucial factor since it affects the sag of the conductor, which must be limited for safety reasons. The KPT was detected based on the change in the coefficient of thermal expansion value of the conductor. To perform this detection, the conductor tension and temperature were monitored. This study proposes a procedure to estimate the coefficient of thermal expansion (CTE) value. The results showed a gradual displacement in CTE. This procedure was used to perform measurements in a pilot line.

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Time Hardening Model for Large Cross Section Conductor Based on Creep Experiments Analysis Under Different Temperature

Rui

Zhao³

et al. 2021

IEEE Trans. Power Delivery

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Field validation of gap-type overhead conductor creep

Cited by 3 publications

References 12 publications

Investigation of sag behaviour for aluminium conductor steel reinforced considering tensile stress distribution

Investigation of sag behaviour for aluminium conductor steel reinforced considering tensile stress distribution

Sag‐tension evaluation of high‐temperature gap‐type conductor in operation

Time Hardening Model for Large Cross Section Conductor Based on Creep Experiments Analysis Under Different Temperature

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