Lightning overvoltages in low voltage networks

Mirra, C.; Porrino, A.; Ardito, A.; Nucci, C.A.

doi:10.1049/cp:19970488

Cited by 9 publications

(5 citation statements)

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“…Among those of external origin to the circuit, fundamentally of the transitory type, mainly are caused by atmospheric discharges and followed for the ones generated by power circuit commutations. These surges differ of those caused by lightning, mainly, for their long duration (of until several seconds); although of the short duration of the first ones they are very harmful due to their high energy content [1,2].…”

Section: Introductionmentioning

confidence: 93%

Experimental study of the transfer of overvoltage surges through distribution transformers

Zamanillo¹,

Gómez²,

Tourn³

et al. 2005

18th International Conference and Exhibition on Electricity Distribution (CIRED 2005)

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A high number of low voltage electrical appliances are damaged due to the presence of overvoltage surges that reach them coming from different points of the electric system. In order to clarify how the overvoltage surges coming from the distribution system pass through distribution transformers, an experimental study about overvoltage transference from transformer primary winding to secondary winding has been carried out on distribution and rural type transformers. The methodology consisted on applying dissimilar overvoltage surges to the primary winding, measuring and recording the wave that appears at the secondary coil, determining in this way its magnification, attenuation and change in waveform. As incident waveforms the normalized impulsive wave 1.2/50 µs was adopted. From the experimental results it can be concluded that the impulsive wave is transferred with considerable magnification (up to three times the value of the incident wave) regarding the winding rated voltage and showing a great change in waveform. On the other hand, it can be also concluded that the magnitude of the transferred impulsive wave is function of the transformer constructive characteristics.

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Section: Introductionmentioning

confidence: 93%

Experimental study of the transfer of overvoltage surges through distribution transformers

Zamanillo¹,

Gómez²,

Tourn³

et al. 2005

18th International Conference and Exhibition on Electricity Distribution (CIRED 2005)

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“…From Figure 4, it can be explained that the induction current that enters that structure The resistance R and the point where the structure is installed through the soil is the resistance of the RE. Affects the current value induced into the system [8], [9].…”

Section: Fig 4 Equivalent Resistive Network Of the Aluminum Latticementioning

confidence: 99%

Impacts of Factor Lightning and Surge Protection for Photovoltaic Power Generator on Distribution System

Rugthaicharoencheep

Maigan

2020

AMM

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This research paper presents the analysis of factor lightning protection for photovoltaic power generation. The question of the safety of lightning protection systems in photovoltaic power generation, especially under severe weather conditions such as thunderstorms. Therefore, a simple model of a photovoltaic power generation was developed, which included the arrangement of a conventional photovoltaic panel. The effect of lightning is also simulated by the pattern of lightning currents. It is also found that the size of the panel mounting structure and the point of lightning conduction induce the induced voltage at the junctions of the photovoltaic panel. Based on the results of the impulse current analysis, the intensity of the lightning current is increasing rapidly. All these factors will be taken into consideration in order to design a protective system.

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“…The remaining overvoltage surge changes shape as it travels through the transformer and finally reaches the main distribution board of the facility and the sub-distribution board . The task of the overvoltage protection system of the facility is to carry the remaining part of this wave to the ground [2,4]. Since the LV overhead line has no ground wire, lightning with a high gradient of rising at the front of the surge wave can directly strike the phase conductors or strikes near LV line and induces an overvoltage surge wave on it [12].…”

Section: Overvoltage Placement Of a Gas Discharge Arrester Within Anmentioning

confidence: 99%

“…The authors in [2] studied the effects of the overvoltage phenomenon as a consequence of lightning strikes within radial LV networks. They assumed the travelling of surge waves through the network.…”

Section: Introductionmentioning

confidence: 99%

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Impact of line length on the operation of overvoltage protection in LV networks

Ribič

2015

Electric Power Systems Research

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a b s t r a c tThis paper deals with analysing the impact of LV lines impedance on the operation of overvoltage protection, especially on the operation of gas discharge arresters. A model of the overvoltage protection with all elements (gas discharge arrester and metal-oxide surge arrester) was developed within a Simulink/Matlab environment for this purpose. This model of LV line is presented as a model for the computation of transients. Computations were carried out for various line lengths and various combinations of overvoltage protection elements. On the basis of analyzing the models responses, an analysis was made on the impact of the impedance of LV lines on the ability of self-extinguishing the gas discharge arrester. Some additional measures are also proposed for achieving the proper operation of overvoltage protection.

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Lightning overvoltages in low voltage networks

Cited by 9 publications

References 0 publications

Experimental study of the transfer of overvoltage surges through distribution transformers

Experimental study of the transfer of overvoltage surges through distribution transformers

Impacts of Factor Lightning and Surge Protection for Photovoltaic Power Generator on Distribution System

Impact of line length on the operation of overvoltage protection in LV networks

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