Characterization of internal disturbances and external faults in transformers using an S-transform--based algorithm

Abdolaziz ASHRAFIAN; Mehrdad ROSTAMI; Gevork B. GHAREHPETIAN

Makale detayları

Characterization of internal disturbances and external faults in transformers using an S-transform--based algorithm

Yazarlar:

Abdolaziz ASHRAFIAN | Mehrdad ROSTAMI | Gevork B. GHAREHPETIAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Electrical Engineering and Computer Science 2013 Vol.21 Issue 2, pp.330-349

Belge Tipi:

Makale

Yayın Tarihi:

1/2013

Belge Dili:

Türkçe

Document ID (Org No.):

2000743331

Sıklık:

İki Aylık

eISSN:

1303-6203

pISSN:

1300-0632

Özet:

 

In this paper, the S-transform is used to discriminate  between the internal disturbances and external faults of transformers.  The proposed algorithm consists of 2 stages.  The internal  disturbances and the external faults are distinguished in the first  stage.  Next, the S-transform is applied to differential currents of  faulty phases and the absolute deviation of the S-matrix is  calculated.  The relay scheme issues a trip signal in the case of an  internal fault, according to the absolute deviation of the S-matrix.  The scheme is implemented in a MATLAB environment and the inputs are  differential currents, derived from EMTP software.  In order to  simulate the internal turn-to-turn and turn-to-earth faults, the power  transformer is modeled using 8 x 8 RL matrices, obtained from the  subroutine BCTRAN of the EMTP software.  The differential current  signals are contaminated by noise and the robustness of the algorithm  in a noisy environment is investigated.  The performance of the  S-transform and the wavelet transform are compared.  It is shown that  the proposed algorithm is superior to wavelet transform-based methods.

 

In this paper, the S-transform is used to discriminate  between the internal disturbances and external faults of transformers.  The proposed algorithm consists of 2 stages.  The internal  disturbances and the external faults are distinguished in the first  stage.  Next, the S-transform is applied to differential currents of  faulty phases and the absolute deviation of the S-matrix is  calculated.  The relay scheme issues a trip signal in the case of an  internal fault, according to the absolute deviation of the S-matrix.  The scheme is implemented in a MATLAB environment and the inputs are  differential currents, derived from EMTP software.  In order to  simulate the internal turn-to-turn and turn-to-earth faults, the power  transformer is modeled using 8 x 8 RL matrices, obtained from the  subroutine BCTRAN of the EMTP software.  The differential current  signals are contaminated by noise and the robustness of the algorithm  in a noisy environment is investigated.  The performance of the  S-transform and the wavelet transform are compared.  It is shown that  the proposed algorithm is superior to wavelet transform-based methods.

Makale detayları

Characterization of internal disturbances and external faults in transformers using an S-transform--based algorithm

Yazarlar: Abdolaziz ASHRAFIAN | Mehrdad ROSTAMI | Gevork B. GHAREHPETIAN

Yayıncı: TUBITAK

Dergi: Turkish Journal of Electrical Engineering and Computer Science 2013 Vol.21 Issue 2, pp.330-349

Belge Tipi: Makale

Yayın Tarihi: 1/2013

Belge Dili: Türkçe

Document ID (Org No.): 2000743331

Sıklık: İki Aylık

eISSN: 1303-6203

pISSN: 1300-0632

Sayı

Yazarlar:

Abdolaziz ASHRAFIAN | Mehrdad ROSTAMI | Gevork B. GHAREHPETIAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Electrical Engineering and Computer Science 2013 Vol.21 Issue 2, pp.330-349

Belge Tipi:

Makale

Yayın Tarihi:

1/2013

Belge Dili:

Türkçe

Document ID (Org No.):

2000743331

Sıklık:

İki Aylık

eISSN:

1303-6203

pISSN:

1300-0632