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World Journal of Engineering
Research and Technology

An International Peer Reviewed Journal for Engineering Research and Technology

ISSN 2454-695X

Impact Factor : 5.924

ICV : 79.45

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Indexing

Abstract

EFFECT OF NEUTRAL SYSTEMS ON TEMPORARY OVERVOLTAGE IN DISTRIBUTION NETWORKS

Gamal Hazza*

ABSTRACT

The effect of neutral systems for distribution networks has been evaluated when overvoltage caused by grounded faults. Sana'a distribution networks; as a part of Yemeni interconnected system; have been investigated as a case study. The obtained results confirmed that temporary overvoltage phenomena should be taken into account when neutral systems connect to the neutral point of transformers. Results demonstrate that the installed neutral systems in the distribution networks need remediation in order to overcome the overvoltage phenomena, especially in the 15 kV level. In this work, some solutions have been suggested for mitigating overvoltage values during the faults. The suggested mitigation method based on a modification of the neutral system to add constraints for preventing the unacceptable temporary overvoltage limit which equals 1.2 pu of the nominal voltage value.

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