Development of a DC Current-Blocking Device for Transformer Neutrals

Bolduc, L.; Granger, M.; Pare, G.; Saintonge, J.; Brophy, L.

doi:10.1109/tpwrd.2004.835437

Cited by 93 publications

(12 citation statements)

References 10 publications

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“…In case of GMDs and E3 HEMP events, a widely used mitigation method is reducing transformer reactive power consumption with GIC blocking devices [103][104][105]. These devices are switched capacitors that are placed between the transformer neutral point and the substation grounding grid.…”

Section: Planning-based Methodsmentioning

confidence: 99%

Resilience in an Evolving Electrical Grid

et al. 2021

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Fundamental shifts in the structure and generation profile of electrical grids are occurring amidst increased demand for resilience. These two simultaneous trends create the need for new planning and operational practices for modern grids that account for the compounding uncertainties inherent in both resilience assessment and increasing contribution of variable inverter-based renewable energy sources. This work reviews the research work addressing the changing generation profile, state-of-the-art practices to address resilience, and research works at the intersection of these two topics in regards to electrical grids. The contribution of this work is to highlight the ongoing research in power system resilience and integration of variable inverter-based renewable energy sources in electrical grids, and to identify areas of current and further study at this intersection. Areas of research identified at this intersection include cyber-physical analysis of solar, wind, and distributed energy resources, microgrids, network evolution and observability, substation automation and self-healing, and probabilistic planning and operation methods.

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Section: Planning-based Methodsmentioning

confidence: 99%

Resilience in an Evolving Electrical Grid

et al. 2021

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“…When DC bias of transformer occurred, the use of the DC bias suppression device had a great influence on the monitoring data [25][26][27]. To obtain the data characteristics when the DC bias occurred and the suppression device was off, the tests were carried out.…”

Section: Data Characteristics When the DC Bias Occurs And The Suppresmentioning

confidence: 99%

Validity Evaluation Method Based on Data Driving for On-Line Monitoring Data of Transformer under DC-Bias

Zhou

Lin

et al. 2020

Sensors

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The DC-bias monitoring device of a transformer is easily affected by external noise interference, equipment aging, and communication failure, which makes it difficult to guarantee the validity of monitoring data and causes great problems for future data analysis. For this reason, this paper proposes a validity evaluation method based on data driving for the on-line monitoring data of a transformer under DC-bias. First, the variation rule and threshold range of monitoring data for neutral point DC, vibration, and noise of the transformer under different working conditions are obtained through statistical analysis. Then, the data validity criterion of DC bias monitoring data is proposed to achieve a comprehensive evaluation of data validity based on data threshold, continuity, impact, and correlation. In addition, case studies are carried out on the real measured data of the DC bias magnetic monitoring system of a regional power grid by using this evaluation method. The results show that the proposed method can systematically and comprehensively evaluate the validity of the DC bias monitoring data and can judge whether the monitoring device fails to a certain extent.

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“…In works [4][5][6][7][8][9][10][11][12][13][14][15][16] it was proved that the immediate cause of transmission system failures are these GIC induced in the HV transmission line. These currents cause the phenomenon of semisaturation, ie half-period supersaturation of the magnetic circuit of the power transformers, which results in current and consequently thermal overload of their VHV windings.…”

Section: Introductionmentioning

confidence: 99%

Indicator of the influence of a geomagnetic storm on the transmission electric system

Mayer

Štork

2023

Journal of Electrical Engineering

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Magnetic storms are severe disorders in the Earth’s magnetosphere caused by enormous solar activity. The magnetic storm induces a quasi-stationary geomagnetic current (GIC) in the wires of the very high voltage (VHV) lines. These currents cause the current and thus thermal overload of the VHV part of the transmission lines, especially the transformers of the system. In the submitted article described by a device that indicates these effects of magnetic storms on the transmission system and allows it to carry out its safe operation. The indicator is located on the VHV wire of the bundle conductor. Using the Hall probe, it senses the magnetic field of the current in the line. With a digital frequency low-pas filter removes the ac component of the indicated current and information about its dc component, ie about the GIC, wireless transmission to the workplace of the system operator. This will then instruct the transmission system protective regime.

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Development of a DC Current-Blocking Device for Transformer Neutrals

Cited by 93 publications

References 10 publications

Resilience in an Evolving Electrical Grid

Resilience in an Evolving Electrical Grid

Validity Evaluation Method Based on Data Driving for On-Line Monitoring Data of Transformer under DC-Bias

Indicator of the influence of a geomagnetic storm on the transmission electric system

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