Immediate and delayed responses of power lines and transformers in the Czech electric power grid to geomagnetic storms

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F20%3A00534668" target="_blank" >RIV/67985815:_____/20:00534668 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/20:10413874

Výsledek na webu

<a href="http://hdl.handle.net/11104/0312840" target="_blank" >http://hdl.handle.net/11104/0312840</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/swsc/2020025" target="_blank" >10.1051/swsc/2020025</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Immediate and delayed responses of power lines and transformers in the Czech electric power grid to geomagnetic storms

Popis výsledku v původním jazyce

We search for a rapid response of devices in the Czech electric distribution grid to disturbed days of high geomagnetic activity. Such disturbed days are described either by the cumulative storm-time Dst or d(SYM-H)/dtlow-latitude indices mainly influenced by ring current variations, by the cumulative AE high-latitude index measuring substorm-related auroral current variations, or by the cumulative ap mid-latitude index measuring both ring and auroral current variations. We use superposed epoch analysis to identify possible increases of anomaly rates during and after such disturbed days. We show that in the case of abundant series of anomalies on power lines, the anomaly rate increases significantly immediately (within 1 day) after the onset of geomagnetic storms. In the case of transformers, the increase of the anomaly rate is generally delayed by 2-3 days. We also find that transformers and some electric substations seem to be sensitive to a prolonged exposure to substorms, with a delayed increase of anomalies. Overall, we show that in the 5-day period following the commencement of geomagnetic activity there is an approximately 5-10% increase in the recorded anomalies in the Czech power grid and thus this fraction of anomalies is probably related to an exposure to GICs.

Název v anglickém jazyce

Immediate and delayed responses of power lines and transformers in the Czech electric power grid to geomagnetic storms

Popis výsledku anglicky

We search for a rapid response of devices in the Czech electric distribution grid to disturbed days of high geomagnetic activity. Such disturbed days are described either by the cumulative storm-time Dst or d(SYM-H)/dtlow-latitude indices mainly influenced by ring current variations, by the cumulative AE high-latitude index measuring substorm-related auroral current variations, or by the cumulative ap mid-latitude index measuring both ring and auroral current variations. We use superposed epoch analysis to identify possible increases of anomaly rates during and after such disturbed days. We show that in the case of abundant series of anomalies on power lines, the anomaly rate increases significantly immediately (within 1 day) after the onset of geomagnetic storms. In the case of transformers, the increase of the anomaly rate is generally delayed by 2-3 days. We also find that transformers and some electric substations seem to be sensitive to a prolonged exposure to substorms, with a delayed increase of anomalies. Overall, we show that in the 5-day period following the commencement of geomagnetic activity there is an approximately 5-10% increase in the recorded anomalies in the Czech power grid and thus this fraction of anomalies is probably related to an exposure to GICs.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Space Weather and Space Climate

ISSN

2115-7251

e-ISSN

—

Svazek periodika

10

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

31

Strana od-do

26

Kód UT WoS článku

000549812900001

EID výsledku v databázi Scopus

2-s2.0-85087861940