Overvoltages during power-system faults

Clarke, Edith; Crary, S. B.; Peterson, H. A.

doi:10.1109/ee.1939.6431480

Cited by 20 publications

(3 citation statements)

References 11 publications

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“…The EPS neutral grounding causes a difference between the total positive-and zero-sequence impedances, being directly related to the transformer neutral grounding. Transformer neutral grounding, or, in general, EPS neutral grounding, causes a great influence on temporary overvoltages in non-faulty phases and determines the fault current magnitude during ground faults [14][15][16]. Therefore, it is a feature that impacts SDVVs.…”

Section: Transformers Winding Connection and Neutral Grounding Assessmentmentioning

confidence: 99%

“…Furthermore, the load connection can likewise determine how certain loads experience unbalanced SDVVs [6,12,13]. Beyond that, the winding connection and the presence or absence of a neutral to ground connection influence the zero-sequence circuit continuity between both sides of a transformer and on the system zero-sequence impedance, which also changes the SDVV characteristics [6,[14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Main and Secondary Transformers on Mitigation of Voltage Sags, Swells and Interruptions in Unbalanced Medium Voltage Distribution Systems

Costa

Gazzana

Leborgne

2020

Electric Power Components and Systems

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CONTENTS 1. Introduction 2. Concepts Related to SDVVS: Definition and Stratification 3. Methodology Applied to the Study 4. Case Study 5. Results and Discussion Conclusion Acknowledgment ReferencesAbstract--Since voltage interruptions, sags and swells are Power Quality (PQ) disturbances with great economic impact, studies that seek alternatives to mitigate its effects have been conducted extensively. The PQ Brazilian standard names these disturbances as Short-Duration Voltage Variations (SDVVs), classified them in terms of magnitude, duration, and frequency of occurrence. These parameters are used to calculate the Impact Factor (IF) of SDVVs, a severity-characterization index of their incidence. In this context, this work assesses the influence of three-phase transformer winding connection and neutral grounding on the quantities of SDVVs and the IF observed by an industrial consumer in a distribution system. Fault simulations at ATP-EMTP perform the study, considering two different winding connections for the secondary transformer and applying a grounding resistance to the neutral of the main transformer of the distribution system. The SDVVs are verified in two different ways: phase-to-ground and phase-to-phase voltages. It is observed that there are differences in these quantities and for the value of the IF due to the winding connection of the secondary transformer, the value of the neutral grounding resistance of the main transformer and the ways of voltage verification.

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Section: Transformers Winding Connection and Neutral Grounding Assessmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Main and Secondary Transformers on Mitigation of Voltage Sags, Swells and Interruptions in Unbalanced Medium Voltage Distribution Systems

Costa

Gazzana

Leborgne

2020

Electric Power Components and Systems

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show abstract

“…Para que este método pudesse ser aplicado, partiu-se do pressuposto de que as impedâncias directa e inversa são iguais (em regra, adopta-se na análise de defeitos em sistemas de potência), que a tensão que se obtém diz respeito somente ao ponto de defeito e que são desprezáveis os efeitos de coroa e de saturação. Num outro estudo, respeitante à avaliação das tensões que se obtêm na ocorrência de defeitos para a terra [11], os autores utilizam uma vez mais as componentes simétricas das impedâncias do sistema, partindo do estudo de curvas pré--definidas de tensões. Desta feita, conclui-se que as tensões que se obtêm, num sistema de neutro solidamente ligado à terra e na ocorrência de defeito, não ultrapassa os 1.73 da tensão nominal de pré-defeito.…”

Section: Sistemas De Potênciaunclassified

Determination of the Earth Fault Factor in Power Systems for Different Earthed Neutrals

Calado

Mariano

2010

IEEE Latin Am. Trans.

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This paper proposes an analytical method to calculate the earth fault factor (EFF) in power systems, under different neutral earthed possibilities. The magnitude of the EFF depends on the way the neutrals of a system are earthed and influences some important aspects in power systems as the sensitivity and selectivity of relays, the value of short-circuit currents, the overvoltage between lines and earth, the determination of arrester rating and the system insulation level. The obtained results are compared with the values of EFF referred in International Standards.

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Transient overvoltages and distance protections: problems and solutions

Torelli¹,

Moorthy²

2010

10th IET International Conference on Developments in Power System Protection (DPSP 2010). Managing the Change

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Overvoltages during power-system faults

Cited by 20 publications

References 11 publications

Investigation of Main and Secondary Transformers on Mitigation of Voltage Sags, Swells and Interruptions in Unbalanced Medium Voltage Distribution Systems

Investigation of Main and Secondary Transformers on Mitigation of Voltage Sags, Swells and Interruptions in Unbalanced Medium Voltage Distribution Systems

Determination of the Earth Fault Factor in Power Systems for Different Earthed Neutrals

Transient overvoltages and distance protections: problems and solutions

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