Impact Evaluation of the Neutral-Grounding Resistance on Short-Duration RMS Voltage Variations

Costa, Lucas Araujo da; Mohammadi, Younes; Leborgne, Roberto Chouhy; Gazzana, Daniel S.

doi:10.1109/ichqp46026.2020.9177891

Cited by 5 publications

(2 citation statements)

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“…There are changes in phasor voltages passing through transformers when different connections are used for their primary and secondary windings. 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%

“…Posterior works [6,[17][18][19] showed that voltage sags can be sorted into up seven types, which are a function of the fault type and transformer winding and load connections. Moreover, the influence of neutral grounding practice and the value of the zero-sequence impedance on voltages sags were given in [6] and further extended in [13], where their effects during unbalanced ground faults were analytically demonstrated.…”

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: Introductionmentioning

confidence: 99%