The insulation co-ordination of high-voltage stations

Diesendorf, W.

doi:10.1016/b978-0-408-70464-9.50011-3

Cited by 14 publications

(8 citation statements)

References 11 publications

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“…The lightning-path impedance of 400 Ω was derived by Bewley [21]. Diesendorf [22] suggested 1000-2000 Ω for lightning-path impedance. Gorin and Shkilev [23] used current oscillograms to estimate the equivalent impedance of the lightning channel and their estimates varied from 600 Ω to 2.5 kΩ.…”

Section: Simulation Resultsmentioning

confidence: 99%

Lightning surge analysis of Faraday cage using alternative transient program‐electromagnetic transients program

Mamiş

Keles

Arkan

et al. 2016

IET Generation, Transmission & Distribution

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Section: Simulation Resultsmentioning

confidence: 99%

Lightning surge analysis of Faraday cage using alternative transient program‐electromagnetic transients program

Mamiş

Keles

Arkan

et al. 2016

IET Generation, Transmission & Distribution

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“…The lightning stroke current waveform is a ramp waveform with a front duration of 1 μs, a wave tail duration of 70 μs (1 / 70 μs) and a standard crest value of 150 kA for a 500 kV system. In this analysis, it was verified whether or not flashover occurred for a crest value of 200 kA and a lightning path impedance of 1,000 Ω [19] in addition. In this case, the incoming line span from the gantry to the tower was set at 150 m. Table 1 shows whether or not a flashover occurred in the event of a lightning stroke to the first tower based on FDTD simulation.…”

Section: Conditions For Back-flashover Due To a Lightning Stroke To Tmentioning

confidence: 87%

Lightning surge into a substation at a back-flashover and review of lightning protective level through the FDTD simulation

Takami

Tsuboi

Yamamoto

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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Higher accuracy in the lightning-surge analysis has been pursued; based on circuit analysis. However, the need to analyze phenomena where a plane wave propagation mode cannot be assumed is an outstanding issue. The finite-difference time-domain (FDTD) method is a dominant measure to solve such issue. This study evaluated surge waveforms intruding into a 500 kV air-insulated substation due to a back-flashover through FDTD simulation. The lightning surges were calculated with the inclined angle of the incoming line changed from 0 to 69 degrees and the voltage of the lightning surge intruding into the substation decreased with increasing incline angle of the incoming line. At the open end of the incoming line to the substation at the circuit breaker, the voltage was minimized and maximized when the span length was 20 m and 200 m respectively. This result differed in terms of characteristics from that obtained using the conventional circuit analysis model, whereby the voltage was minimized when the span length was 200 m. The lightning overvoltage at the circuit breaker terminal based on FDTD analysis was lower than that based on circuit analysis. Their relative ratio is 0.557 for a standard incoming line span length of 150 m, showing a 44 % reduction in FDTD analysis from the circuit analytical result. Since the current lightning impulse test voltage is evaluated based on this circuit analytical result, it was clarified that the lightning impulse test voltage level could be potentially reduced with consideration of the inclined conductors at the incoming line span, the vertical conductors of the tower and lightning path, and their mutual coupling with the transmission line. Index Terms -Transmission line, substation, incoming line, lightning surge, backflashover, non-uniform line, lightning protection design.

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“…The resistance, inductance, and capacitance of the under transient phenomenon are calculated by [13], [14]: A back flashover occurs when a lightning strikes an OHGW or pole of a subtransmission line, resulting in the voltage across the insulators exceeding CFO. BFOR is a product of the number of lightning strikes to the OHGW and a probability of stroke critical current [7], [9], [10], [12]. The critical current is defined as lightning stroke current when injected into the conductor causing flashover.…”

Section: E Number Of Lightning Strikes To Linesmentioning

confidence: 99%

Lightning performance analysis of overhead subtransmission lines in power system

Phayomhom¹,

Kulwongwit²,

Rugthaicharoencheep

2014

2014 International Conference on Lightning Protection (ICLP)

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This paper analyzes the existing performance of insulator strings described in term of the total flash over rate (TFOR) for 69 kV and 115 kV subtransmission lines in a service area of Metropolitan Electricity Authority (MEA), Thailand. Presently, the design and installation of insulator strings for 69 kV and 115 kV subtransmission lines in MEA are based on American National Standards Institute (ANSI). The applications of this standard may not be appropriate for insulation coordination evaluation in MEA because of the different number of thunderstorm days. As a result, the failure on insulator strings of subtransmission system in MEA was often found. The resultsshow that the difference in TFORs of the lines is significant for different thunderstorm days and probability peak current curves.

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The insulation co-ordination of high-voltage stations

Cited by 14 publications

References 11 publications

Lightning surge analysis of Faraday cage using alternative transient program‐electromagnetic transients program

Lightning surge analysis of Faraday cage using alternative transient program‐electromagnetic transients program

Lightning surge into a substation at a back-flashover and review of lightning protective level through the FDTD simulation

Lightning performance analysis of overhead subtransmission lines in power system

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