Transient overvoltages on power systems

Bickford, J.P.; Heaton, A.G.

doi:10.1049/ip-c.1986.0033

Cited by 20 publications

(3 citation statements)

References 1 publication

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“…Lightning disaster is one of the main causes of distribution line faults [1] and direct lightning strikes can be great threat to power systems [2]. At present, there are various lightning protection measures for distribution lines, but the effectiveness of protection measures has not been tested sufficiently.…”

Section: Introductionmentioning

confidence: 99%

Three‐phase overvoltage at lightning strike point due to direct triggered lightning to the phase wire of 10 kV power distribution line

Wang

Zhao

et al. 2022

IET Generation Trans & Dist

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This paper reports the observation results of three‐phase overvoltage at the lightning strike point of a 1.5 km, 10 kV power distribution line that was struck directly by rocket triggered lightning to its phase wire C. The arrester of the direct struck phase at the lightning strike point operated in all return strokes corresponding to return stroke current from −3.3 kA to −32.9 kA. The waveform of direct struck phase includes an initial spike before negative peak, operation area of metal oxide varistor, and the final attenuation with oscillation. The overvoltage waveforms of the indirect struck phase at the lightning strike point show a small initial negative peak, rapid transition to a large positive peak, and the final negative attenuation with oscillation. The negative peak value of the indirect struck phase at lightning strike point ranged from −4.1 kV to −25.2 kV and that of the direct struck phase was between −78.1 kV and −167.8 kV. The positive peak value of indirect struck phase was between 0.2 kV and 49.8 kV. The negative peak value, zero‐crossing time and the peak‐to‐peak value of voltage all have a good linear relation with the peak value of lightning return stroke current.

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Section: Introductionmentioning

confidence: 99%

Three‐phase overvoltage at lightning strike point due to direct triggered lightning to the phase wire of 10 kV power distribution line

Wang

Zhao

et al. 2022

IET Generation Trans & Dist

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“…The resonance overvoltages generated inside the windings caused by the switching phenomena in SF 6 switchgears and power networks, as well as the overvoltages triggered during ground faults due to lightning, contributed to many transformer failures protected by surge arresters, selected according to insulation coordination rules as reported, e.g., in [6][7][8][9][10]. It has also been reported that in some cases the inter-turn insulation is stressed due to internal resonance overvoltage to a greater extent than those subjected to lightning impulse voltage (BIIL-basic insulation impulse level) during the routine test (e.g.…”

Section: Introductionmentioning

confidence: 99%

Application of the transfer function to recognition of resonance overvoltages in transformer windings

Florkowski

Furgał

2010

Meas. Sci. Technol.

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Power transformer insulation systems are subjected to many stresses during normal operation due to lightning and switching. If the spectrum of incoming surge voltage matches the winding one, a corresponding resonance will be excited. Therefore external transients occurring in power systems might trigger internal overvoltages of a large maximum value in transformer windings. Overvoltages having such a character have been the main cause of many power transformer failures. This paper presents a novel approach to the identification of sensitive zones in the transformer windings based on measurements of overvoltages inside the windings and the frequency dependences of admittance of the power transformer. The frequency characteristics of the transformer winding may determine those regions in the frequency spectrum. The presented methodology might be used both for design optimization and diagnostics of power transformers.

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“…Fast transients are difficult to analyze, capture, and mitigate but the concerns with these steep surges and resultant loss of 1 Mietek Glinkowski is with ABB Medium Voltage Business Unit, Raleigh, NC 27606, USA. E-mail: mietek.glinkowski@us.abb.com 2 [10], primarily dealing with the numerical analysis of the generation of transients, and its effects on the insulation systems.…”

Section: Introductionmentioning

confidence: 99%

SmartChoke - protecting power equipment from fast transients

Glinkowski¹,

Piasecki

Florkowski

et al. 2008

2008 IEEE/PES Transmission and Distribution Conference and Exposition

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Fast transients in power systems can damage cables, motors, transformers, instrument transformers, reactors, and other equipment in both distribution and transmission networks. They are generated not only by lightning, but also by system switching operations or even by power electronics. As discovered more recently, the interaction between devices with specific highfrequency characteristics can lead to abnormal and harmful surges with steep fronts and high frequency components. Often, the existing means of surge protection, like surge capacitors, ZnO arresters, and even RC snubbers are not sufficient or are too cumbersome to be installed effectively against these surges. SmartChoke is a new type of device that can provide a better way of protecting the system. This paper presents some experimental verifications of the effectiveness of the device. Subsequent publications will also describe the device technology and more detailed application examples in the distribution networks.

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Transient overvoltages on power systems

Cited by 20 publications

References 1 publication

Three‐phase overvoltage at lightning strike point due to direct triggered lightning to the phase wire of 10 kV power distribution line

Three‐phase overvoltage at lightning strike point due to direct triggered lightning to the phase wire of 10 kV power distribution line

Application of the transfer function to recognition of resonance overvoltages in transformer windings

SmartChoke - protecting power equipment from fast transients

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