Investigation on Shielding Failure of a Novel 400-k$\text{V}$ Double-Circuit Composite Tower

Wang, Qian; Jahangiri, Tohid; Bak, Claus Leth; Silva, Filipe Miguel Faria da; Skouboe, Henrik

doi:10.1109/tpwrd.2017.2716383

Cited by 16 publications

(6 citation statements)

References 11 publications

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“…The spatial shielding failure probability around the tower was calculated based on the ratio of discharge paths recorded in the test. The test results verified the feasibility of EGM in the lightning performance evaluation of the fully composite pylon and confirmed that the special negative shielding angle in the new composite tower provides good lightning shielding performance [9]. Although this research was based on scale model which has limitations to simulate the real case because the facility and space limitations and degree of air ionization is not changed linearly with the scale ratio, scale model is still meaningful for lightning performance investigation due to the similarity of the long gap discharges in the laboratory with the final stage of natural lightning.…”

Section: Introductionsupporting

confidence: 59%

“…Another index used to indicate the lightning protection level is the lightning trip-out rate (LTR), which refers to all kinds of tripping operation caused by lighting striking, including BFR and shielding failure rate. Reference [8,9] points out that there is almost no possibility of shielding failure for Eagle tower and Y composite pylon due to the negative protection angle. With the SFFOR taken into consideration, the final LTR for Y shaped pylon and Donau tower are 0.00294 and 0.0291 flashes/100 km-year, and the lightning performance of Y pylon with the optimized down-lead system is much better than that of traditional Donau and Eagle towers.…”

Section: B Comparison With Traditional Towersmentioning

confidence: 99%

“…In summary, the theoretical calculation for this new pylon shows an almost perfect evaluation in the point of shielding failure. Subsequently, Wang et al [9] conducted the relevant test. The spatial shielding failure probability around the tower was calculated based on the ratio of discharge paths recorded in the test.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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: Introductionsupporting

confidence: 59%

Section: B Comparison With Traditional Towersmentioning

confidence: 99%

See 1 more Smart Citation

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

Self Cite

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“…And -60 ° can provided better shield performance [6]. According to the above experience, the possibility of lightning shield failure was deeply investigated via both the revised electro-geometric model (EGM) and scale model tests [7], and it was proved to be practically negligible. Operating experience showed that for the overhead lines over 500 kV, lightning strike accidents were majorly caused by the shield failure of lightning striking towers and shield wires.…”

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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“…Composite towers are being widely used in power systems due to their excellent insulation and mechanical properties [1–3 ]. However, there is a partial arc near metal joints on composite towers under wet polluted conditions [4 ].…”

Section: Introductionmentioning

confidence: 99%

Study on dry band discharge of wet polluted surface with float potential metal by electro-thermal synchronous observation

Lan

Wang

et al. 2020

IET Science, Measurement &Amp; Technology

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Severe partial arc occurred near metal bolts on the composite tower under wet pollution conditions, which had a close relationship with the temperature distribution on the surface. Artificial contamination tests on the small‐sized composite plate were carried out. Temperature distribution and leakage current variation of the specimen were acquired synchronously. The effects of float potential metal, pollution layer width, metal shape, and moisture on temperature distribution, dry band formation, and discharge phenomenon were studied by a series of comparative experiments. The results show that the float potential metal makes the temperature distribution of the pollution layer more concentrated. The dry band begins to form in the region with the highest temperature. The formation of a dry band on the narrow pollution layer is faster. The temperature of the dry band endpoint is very high and increases with the extension of the dry band. The formation and passing through of dry band blocks leakage current leading to the occurrence of partial arc. Temperature distribution near metals with sharp shapes is more inhomogeneous. In a humid environment, dry band arc can exist stably and develop to float potential metal. Owing to the rewetting of the dry band, dry band formation, and dry band arc will occur repeatedly.

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Investigation on Shielding Failure of a Novel 400-k$\text{V}$ Double-Circuit Composite Tower

Cited by 16 publications

References 11 publications

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

Transient modelling and backflashover rate analysis of a fully composite pylon

Study on dry band discharge of wet polluted surface with float potential metal by electro-thermal synchronous observation

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