Effects of GIC on power transformers and power systems

Girgis, R.S.; Vedante, Kiran

doi:10.1109/tdc.2012.6281595

Cited by 85 publications

(43 citation statements)

References 7 publications

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“…We considered transformers with either five or three limbs. In three-limb transformers, the change in flux due to GIC is smaller than for five-limb transformers (Girgis et al, 2012). Our simulations show no voltage instabilities for the system when all transformers are three-limbed.…”

Section: Resultsmentioning

confidence: 64%

North Europe power transmission system vulnerability during extreme space weather

Piccinelli

Elisabeth

2018

J. Space Weather Space Clim.

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-Space weather driven by solar activity can induce geomagnetic disturbances at the Earth's surface that can affect power transmission systems. Variations in the geomagnetic field result in geomagnetically induced currents that can enter the system through its grounding connections, saturate transformers and lead to system instability and possibly collapse. This study analyzes the impact of extreme space weather on the northern part of the European power transmission grid for different transformer designs to understand its vulnerability in case of an extreme event. The behavior of the system was analyzed in its operational mode during a severe geomagnetic storm, and mitigation measures, like line compensation, were also considered. These measures change the topology of the system, thus varying the path of geomagnetically induced currents and inducing a local imbalance in the voltage stability superimposed on the grid operational flow. Our analysis shows that the North European power transmission system is fairly robust against extreme space weather events. When considering transformers more vulnerable to geomagnetic storms, only few episodes of instability were found in correspondence with an existing voltage instability due to the underlying system load. The presence of mitigation measures limited the areas of the network in which bus voltage instabilities arise with respect to the system in which mitigation measures are absent.

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Section: Resultsmentioning

confidence: 64%

North Europe power transmission system vulnerability during extreme space weather

Piccinelli

Elisabeth

2018

J. Space Weather Space Clim.

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“…Next, I h2 is mapped into an effective GIC per phase. For a relative wide range of GIC amplitudes (up to a 100 Amps per phase), a linear relationship is reasonable; see (7). For higher amplitudes of GIC, the third order polynomial in (8) …”

Section: Harmonic Monitoring Methodologymentioning

confidence: 88%

“…Dominion's EHV fleet of power transformers consists of single-phase, core/shell designed, 500/230 kV, 280MVA auto-transformers. A comprehensive analysis for different core configurations can be found in [1,[6][7][8]. Fig.…”

Section: B Harmonic Spectrum Of Transformer Magnetizing Current Durimentioning

confidence: 99%

Single-Phase Transformer Harmonics Produced During Geomagnetic Disturbances: Theory, Modeling, and Monitoring

Bernabeu

2015

IEEE Trans. Power Delivery

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The main purpose of this paper is to provide a methodology to monitor harmonics produced by power transformers during Geomagnetic Disturbances (GMD). The advocated scheme leverages existing infrastructure and is based on the embedded operating quantities of microprocessor-based differential protection relays. The characteristics of single-phase transformer magnetizing current are discussed. The second harmonic signature is a good indicator of half-cycle saturation and can be mapped into an effective Geomagnetically Induced Current (GIC). The proposed scheme was tested in closed-loop using a Real Time Digital Simulator (RTDS) and validated with field measurements.

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“…Istovremeno transformator se greje i u krajnjem slučaju, ako je DC struja velika, termički se razara. Orijentacije radi, treba reći da struja do oko 20 A, što odgovara niskom nivou geomagnetske struje, izaziva porast temperature transformatora za samo 1 o C [10]. Sa druge strane, tipični impuls GIC iznosi 400 A i traje nekoliko minuta.…”

Section: Slika 2 -Način Ulaska Gic U Elektroenergetski Sistemunclassified

“…oblik AC struje, [10] Posledice uticaja GIC-a zavise i od tipa energetskog transformatora. Za određeni transformator maksimalna dozvoljena DC struja kroz neutral zavisi od više faktora, napr.…”

Section: Slika 3 -Uz Objašnjenje Uticaja DC Struje Na Talasniunclassified

Overview of the problems related to the impact of geomagnetic induced current

Kostić¹

2017

Tehnika

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Effects of GIC on power transformers and power systems

Cited by 85 publications

References 7 publications

North Europe power transmission system vulnerability during extreme space weather

North Europe power transmission system vulnerability during extreme space weather

Single-Phase Transformer Harmonics Produced During Geomagnetic Disturbances: Theory, Modeling, and Monitoring

Overview of the problems related to the impact of geomagnetic induced current

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