Reproduction of Lightning Incidence Resulted in Line Surge Arrester Failure

The voltage across a 77‐kV‐class transmission line surge arrester (TLSA) and the heat in the TLSA have been computed using the finite‐difference time‐domain (FDTD) method for a lightning current having a magnitude of 50 kA, a risetime of 1 μs, and a half‐peak width of about 100 μs. The TLSA is represented with series‐connected‐nine ZnO elements, each of which has a length of 36 mm and a diameter of 32 mm. The ZnO element is represented with many 2 × 2 × 2 mm cubic cells, each of which has a nonlinear resistivity in each of the x‐, y‐, and z‐directions dependent on the electric field in each direction and the temperature in each cell. From the spatial and temporal distributions of FDTD‐computed heat in the TLSA, the spatial and temporal distributions of thermal stress in the TLSA have been computed using the finite‐element method. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

“…Transmission line surge arresters (TLSAs) are damaged or broken by high-and long-duration currents of winter lightning [1,2]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Electromagnetic Field, Heat and Thermal Stress of a Transmission Line Surge Arrester for Lightning Currents

Nishimura

Baba

Shinjo

2023

“…It has been reported that transmission-line arresters are broken by winter lightning [1,2], which has long-duration current and large energy. Transmission-line arresters are composed of series-stacked zinc-oxide (ZnO) elements.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic and Thermal Analysis of a ZnO Element of Transmission‐Line Arrester for a Lightning Surge Current

Saito

Tanaka

Tosa

et al. 2021

The voltage generated across a zinc-oxide (ZnO) element, in which a lightning impulse current flows, has been computed with the finite-difference time-domain (FDTD) method. Also, the distribution of temperature in the ZnO element has been computed on the basis of FDTD-computed conduction current densities with a discretized heat equation. The ZnO element having a thickness of 37 mm and a diameter of 34 mm is represented with many 1 mm × 1 mm × 1 mm cubic cells, each of which has a nonlinear resistivity in each of the x , y, and z directions dependent on the electric field in each direction and the temperature in each cell. Waveforms of voltage appearing across the ZnO element and the temperature on the side surface of the ZnO element computed for a short lightning impulse current having a magnitude of 66 kA agree reasonably well with the corresponding measured ones.

“…TLAs are also an effective means of reducing the frequency of instantaneous voltage drops . However, TLAs are sometimes damaged due to energy stresses generated by a lightning stroke with high peaks and/or a long duration of current, particularly in winter . There are also cases of damage due to lightning strokes of several times.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of improved detection method for damaged transmission line arresters using frequency characteristics of equivalent series resistance

Kawamura

Itamoto

Shinjo

2019

Self Cite

As an effective countermeasure against lightning faults on transmission lines, transmission line arresters (TLAs) have been installed. However, they have been damaged by lightning strokes with large electric charges, particularly in winter. Through the investigation of damaged TLAs, we found that some of the internal zinc oxide elements had been damaged despite the undamaged appearance of the arresters. Therefore, it is necessary to detect TLAs with damaged zinc oxide elements as soon as possible to prevent lightning faults with arrester failures. As reported in this paper, we have improved the previous method of detecting TLAs with damaged zinc oxide elements using the frequency characteristics of equivalent series resistance and evaluated the accuracy of the improved method.