Field experience of small quasi-DC bias on power transformers

Albert, Dennis A.; Schachinger, Philipp; Renner, Herwig; Hamberger, P.; Klammer, F.; Achleitner, Georg

doi:10.1007/s00502-020-00846-1

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…In the case of power grids, GICs enter through grounded transformer neutral points. The frequency range of GICs is lower than 0.1 Hz [2] and compared to the grid operating frequency of 50 or 60 Hz, GICs behave like DC. GICs lead to half-cycle saturation of transformers, causing internal temperature hot spots, harmonic emissions and higher reactive power demand.…”

Section: Introductionmentioning

confidence: 98%

Reduction of Geomagnetically Induced Current Impacts by Optimized Neutral Point Connections

Schachinger

Albert

Renner

2023

Preprint

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Solar storms impact electrical power grids by causing DC neutral point currents in transformers. These currents lead to half-cycle saturation as well as other related and unwanted effects in the grid. To reduce the effect of these currents on the grid, DC-blocking devices can be installed or changes in the grid topology can be made. However, these counter measures often have unwanted side effects or cannot be applied to the grid due to operational restrictions. In this work, a novel mitigation approach, based on the distribution of currents on more transformers, is presented. The number and location of grounded transformer neutral points is optimized, taking grid related constraints such as the minimal number of transformer connections into account. It is shown that the algorithm can effectively reduce the stress on transformers without any additional assets and thus increase system security.

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Section: Introductionmentioning

confidence: 98%

Reduction of Geomagnetically Induced Current Impacts by Optimized Neutral Point Connections

Schachinger

Albert

Renner

2023

Preprint

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“…In the case of power grids, GICs enter through grounded transformer neutral points. The frequency range of GICs is lower than 0.1 Hz [2] and compared to the grid operating frequency of 50 or 60 Hz, GICs behave like DC or quasi‐DC. GICs lead to half‐cycle saturation of transformers, causing internal temperature hot spots, harmonic emissions and higher reactive power demand.…”

Section: Introductionmentioning

confidence: 99%

Reduction of geomagnetically induced current impacts by optimized neutral point connections

Schachinger

Albert

Renner

2023

IET Generation Trans & Dist

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Solar storms impact electrical power grids by causing quasi‐DC neutral point currents in transformers. These currents lead to half‐cycle saturation as well as other related and unwanted effects in the grid. To reduce the effect of these currents on the grid, DC‐blocking devices can be installed or changes in the grid topology can be made. However, these counter measures often have unwanted side effects or cannot be applied to the grid due to operational restrictions. In this work, a novel mitigation approach, based on the distribution of currents on more transformers, is presented. The number and location of grounded transformer neutral points is optimized, taking grid related constraints such as the minimal number of transformer connections into account. It is shown that the algorithm can effectively reduce the stress on transformers without any additional assets and thus increase system security.

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Analysis of Power Transformer Inrush Current in the Presence of Quasi-Direct Currents

Behdani

Shariatinasab

Afrasiabi

et al. 2022

2022 IEEE International Conference on Environment and Electrical Engineering and 2022 IEEE Industrial and Commercial Power Syst

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Field experience of small quasi-DC bias on power transformers

Cited by 3 publications

References 12 publications

Reduction of Geomagnetically Induced Current Impacts by Optimized Neutral Point Connections

Reduction of Geomagnetically Induced Current Impacts by Optimized Neutral Point Connections

Reduction of geomagnetically induced current impacts by optimized neutral point connections

Analysis of Power Transformer Inrush Current in the Presence of Quasi-Direct Currents

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