Design of Generator Stator Protection 100% Using Overvoltage and Undervoltage Schemes

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Ali Mashar
Department of Energy Conversion Engineering - Politeknik Negeri Bandung

Maula Zahara Firdausi
Department of Energy Conversion Engineering - Politeknik Negeri Bandung

Achmad Mudawari
Department of Energy Conversion Engineering - Politeknik Negeri Bandung

Achmad Deni Mulyadi
Department of Energy Conversion Engineering - Politeknik Negeri Bandung

Djafar Sodiq
Department of Energy Conversion Engineering - Politeknik Negeri Bandung

Keywords

Neutral grounding transformer, Secondary resistor, Relay settings, Relay sensitivity, Relay overlapping

Abstract

Nowadays, there are still many high capacity generators have not yet protected completely from their internal ground faults. They still rely on differential and over current relays. It is seen that this relay will reduce their sensitivities when applied to generators with high impedance grounding systems. To overcome such problem, a combination protection scheme of the neutral overvoltage (59N) and neutral undervoltage third harmonics (27N3) is developed. This paper aims to design the protection scheme for high capacity generators. This paper demonstrates the designing of neutral grounding transformer (NGT) system, the relay settings and reviewing of their sensitivities. To clarify the concepts this study uses a generator 802 MVA, 22.8 kV as object. The results show that the protection scheme is very effective to protect 100% of generator stator with relays overlapping of 31.5%. It needs NGT transformer with capacity of only 28.33 kVA, 15000/240 V, and the secondary resistor of 0.38,117 kW. This paper can hopefully be used as one reference for protection system engineers to design or develop protection schemes in their fields especially whose generator has not equipped yet with such protection scheme.

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References

IEEE, 1993.Std C37.101, Guide for Generator Ground Protection. USA: IEEE, Inc.
IEEE, 2017. Std C62.92.2 - 2017 Guide for The Application of Neutral Groundingin Electrical Utility Systems, Part II - Synchronous Generator Systems. New York, USA: IEEE, Inc
Marttila, R.J. 1986. Design Principles of A New Generator Stator Ground Relay for 100% Coverage of The Stator Winding. Toronto, Canada: IEEE, Inc
Klingerman, N., 2016. Understanding Generator Stator Ground Faults and Their Protection Schemes. Atlanta, Georgia: Duke Energy & Schweitzer Engineering Laboratories, Inc.
Pope, J.W., 1984. A Comparison of 100% Stator Ground Fault Protection Schemes for Generator Stator Windings. USA: IEEE, Inc.
Xiaobo L., 2010, The Research and Exploiture of Subharmonic Injection Scheme for Generator Stator Ground Protection, China International Conference on Electricity Distribution
Reimert D., 2006, Protective Relaying for Power Generation Systems, Taylor & Francis Group, London, New York
IEEE, 2000, Std C62.92.1, Guide for the Aplication of Neutral Grounding in Electrical Utility Systems-Part 1: Introduction, New York, USA: IEEE, Inc
IEEE, 2006, Std C37.102™-, Guide forAC Generator Protection, New York, USA: IEEE, Inc
Mashar, A, Hernawan, K, Firdausi, M.Z., 2019, Design of generator grounding systems for 100% generator stator protection schemes using NGT (in Indonesian), Jurnal Energi, Vol. 9, No. 1, 2019, ISSN 2089-2527.

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Published
Apr 17, 2020
DOI https://doi.org/10.35313/ijatr.v1i1.25

Article Details

How to Cite
1.
Mashar A, Firdausi M, Mudawari A, Mulyadi A, Sodiq D. Design of Generator Stator Protection 100% Using Overvoltage and Undervoltage Schemes. IJATR [Internet]. 17Apr.2020 [cited 20Apr.2024];1(1):66 -80. Available from: https://ijatr.polban.ac.id/ijatr/article/view/25
Issue
Vol 1 No 1 (2020)
Section
Articles

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