scholarly journals Investigation of the Effect of Winding Clamping Structure on Frequency Response Signature of 11 kV Distribution Transformer

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2307 ◽  
Author(s):  
Avinash Srikanta Murthy ◽  
Norhafiz Azis ◽  
Salem Al-Ameri ◽  
Mohd Mohd Yousof ◽  
Jasronita Jasni ◽  
...  
Keyword(s):  
Frequency Response ◽  
Correlation Coefficient ◽  
Hypothesis Test ◽  
Response Analysis ◽  
Distribution Transformer ◽  
F Test ◽  
Multiple Test ◽  
Offline Measurement ◽  
Spearman’S Correlation ◽  
Relative Factor

This paper presents an investigation on the sensitivity of frequency response of a 500 kVA, 11/0.433 kV distribution transformer with and without the presence of a winding clamping structure. Frequency response analysis (FRA) measurements of multiple test configurations were carried out with and without the presence of a winding clamping structure. Statistical analyses based on Pearson’s correlation coefficient (PCC), Spearman’s correlation coefficient (SCC), Kendall’s correlation coefficient (KCC), cross-correlation coefficient (CCF), root mean square error (RMSE), absolute sum of logarithmic error (ASLE), hypothesis test (F-test) and relative factor (RF) were applied to determine the effect of the winding clamping structure. It was found that the removal of the winding clamping structure has an impact on the frequency response signature at the frequency less than 2 kHz during offline measurement. It was found that ASLE and F-test are suitable methods that can be used to indicate the variation of frequency response caused by clamping structure removal of the distribution transformer under study.

scholarly journals The effect of short circuit fault in three-phase core-typed transformer

2020 ◽  
Vol 11 (1) ◽  
pp. 409
Author(s):  
N. F. M. Yasid ◽  
A. A. Alawady ◽  
M. F. M. Yousof ◽  
M. A. Talib ◽  
M. S. Kamarudin
Keyword(s):  
Laboratory Test ◽  
Frequency Response ◽  
Short Circuit ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Distribution Transformer ◽  
Three Phase ◽  
The Cost ◽  
Short Circuit Fault ◽  
Measured Phase

Different techniques for monitoring the transformer condition are continuously discussed. This is due to the fact that transformers are one of the most expensive components in the power system network. Not to mention the cost to fix any failure occurred in the transformer that have becoming more expensive nowadays. Frequency response analysis (FRA) is found to be the best method to monitor the transformer reliability. This paper presents a continuation of study presented in previous paper [1]. The study performed a laboratory test to show that the response of a normal winding phase A can be affected by short circuit fault which occurred at LV winding phase a, b, and c. To further investigate, current paper performed FRA measurement and applied fault on all phases. The same procedure is repeated on a distribution transformer to verify the findings. This is to examine the effect of fault at winding of other phases to the response of measured phase.

The Application of Frequency Response Analysis in Online Testing System of Transformer

2012 ◽  
Vol 571 ◽  
pp. 696-700
Author(s):  
Wei Zhou ◽  
Bao Bin Liu
Keyword(s):  
Frequency Response ◽  
Correlation Coefficient ◽  
Data Acquisition System ◽  
Response Analysis ◽  
Testing System ◽  
Online Testing ◽  
Frequency Response Analysis ◽  
Transformer Winding ◽  
The Relationship ◽  
Selection Of

Online testing system based on frequency response analysis is proposed for the deformation of transformer winding. The structure of testing system, the selection of sweep sequence and computer diagram of data acquisition system are developed in the course of design. In the process of analysis, the concept of correlation coefficient is introduced to judge the relationship between the deformation extent and correlation coefficient. With the proposed method, the location of deformation can be determined. The testing curves demonstrate the effectiveness of the presented system.

Estimation and Reduction of Motor Input Surge Voltage using Frequency Response Analysis

2012 ◽  
Vol 132 (8) ◽  
pp. 630-637
Author(s):  
Toru Wakimoto ◽  
Yoshimitsu Takahashi ◽  
Norihito Kimura ◽  
Yukitoshi Narumi ◽  
Naoki Hayakawa
Keyword(s):  
Frequency Response ◽  
Response Analysis ◽  
Frequency Response Analysis

Identification of Trouble of Transformer by Frequency Response Analysis

2009 ◽  
Vol 129 (4) ◽  
pp. 517-525 ◽  
Author(s):  
Satoru Miyazaki ◽  
Yoshinobu Mizutani ◽  
Hiroshi Suzuki ◽  
Michiharu Ichikawa
Keyword(s):  
Frequency Response ◽  
Response Analysis ◽  
Frequency Response Analysis

Diagnosis Criterion of Abnormality of Transformer Winding by Frequency Response Analysis (FRA)

2016 ◽  
Vol 136 (7) ◽  
pp. 654-662
Author(s):  
Satoru Miyazaki ◽  
Yoshinobu Mizutani ◽  
Akira Taguchi ◽  
Junichi Murakami ◽  
Naokazu Tsuji ◽  
...  
Keyword(s):  
Frequency Response ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Transformer Winding ◽  
Diagnosis Criterion

MODAL FREQUENCY RESPONSE ANALYSIS OF HUMAN SUBJECT USING FEM

2018 ◽  
Vol 11 (5) ◽  
Author(s):  
Sahil Savara ◽  
Ishbir Singh ◽  
Sachin Kalsi
Keyword(s):  
Frequency Response ◽  
Human Subject ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Modal Frequency
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