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Performance of transformer differential relay at different neutral grounding resistance based on wavelet transform

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Abstract
Power transformer protective relay should block the tripping during magnetizing inrush and rapidly should operate the tripping during internal faults. There are a variety of protective relays using different measuring techniques to provide reliable and secure transformer protection. These types of the protective relays include electro-mechanical, solid state, digital and numerical relays. Within each group
of them, various algorithms are existed. A stand-alone digital relay has been designed and implemented, where its function can be modified easily to accommodate the protection of different types of transformers by only changing its attendant software. This paper suggests a possibility of improving the digital power transformer algorithm for the protection of three-phase power transformers based on the discrete wavelets transform. This algorithm is able to discriminate between the inrush and internal fault currents even
in the case of an inrush with a low second harmonic component and an internal fault current with a high second harmonic
component. A sample of a power transformer is simulated using the Electro Magnetic Transient Program, and the generated
data are used by theMATLAB to test the performance of the technique, such as its speed of response and reliability. The obtained results showed that the proposed algorithm is reliable, accurate and fast. Also in this paper, the performance of the proposed algorithm is tested for different neutral grounding resistances of the transformer, as it greatly affects the relay sensitivity in the case of turn-to-ground fault.

Keywords : Differential relay · Neutral grounding resistance (NGR) · Transform · Wavelet

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Ketersediaan

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Informasi Detail

Judul Seri

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No. Panggil

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Penerbit

: Springer-Verlag Berlin Heidelberg., 2017

Deskripsi Fisik

Electr Eng (2017) 99:275–284

Bahasa

English

ISBN/ISSN

1432-0487

Klasifikasi

NONE

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

Electronical engineering ; Volume 99, Issue 1, Mar

Subjek

TEKNIK ELEKTRO

Info Detail Spesifik

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Pernyataan Tanggungjawab

ety

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