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New adaptive coordination approach between generator-transformer unit overall differential protection and generator capability curves

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This paper presents a new method to increase the reliability of the generator-transformer unit overall differential
protection with use of the capability charts. The main objective of proposed method is preventing the false
tripping under both heavy external solid-faults associated at Generator Step-Up Transformer (GSUT) HV Side
and Unit Auxiliary Transformer (UAT) LV Side, load rejection either house load rejection or zero load rejection,
and synchronization. Also, the proposed method simultaneously detects both faults at low voltage side of UAT
where the fault current is very small and near to normal load current comparing to generator capacity and singleline-
to-ground faults at GSUT Low voltage side (generator terminal) due to the transformer delta connection that
isolates the zero-sequence component from the network side. The presented method is based on using adaptive
setting (three selected settings) for the generator-transformer unit overall differential protection to raise the
characteristic setting under the external fault, load rejection and synchronization and decrease the characteristic
setting under internal high-impedance fault. The suitable setting is selected according to the location of the
generator operating point inside the generator capability curves. The generator capability curves are divided into
four operating regions, where each one has a different differential characteristic setting having dual-rate of
change of the differential current. The four operating regions are normal load operation and high impedance
internal fault; heavy external and internal faults; load rejection and synchronization; and at under excitation
operation without faults, respectively. The real dynamic simulation of the power station has been conducted by
ATP/EMTP software for the large steam turbine driven synchronous generator. Extensive simulation case studies
for internal faults and system disturbances are investigated as well as practical recorded signals.

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Ketersediaan

EJ20217

My Library

Tersedia

Informasi Detil

Judul Seri

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No. Panggil

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Penerbit

Elsevier Ltd. : ., 2020

Deskripsi Fisik

15 p.

Bahasa

English

ISBN/ISSN

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Klasifikasi

NONE

Tipe Isi

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Tipe Media

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Tipe Pembawa

online resource

Edisi

Electrical Power and Energy Systems 118 (2020) 105

Subyek

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Info Detil Spesifik

Ejurnal

Pernyataan Tanggungjawab

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