Proposal of objective criterion in diagnosis of abnormalities of power-transformer winding by Frequency Response Analysis

2016 ◽  
Author(s):  
S. Miyazaki ◽  
Y. Mizutani ◽  
A. Taguchi ◽  
J. Murakami ◽  
N. Tsuji ◽  
...  
Keyword(s):  
Frequency Response ◽  
Power Transformer ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Objective Criterion ◽  
Transformer Winding

scholarly journals Application of Frequency Response Analysis for in-service power transformers

2017 ◽  
Vol 20 (K1) ◽  
pp. 58-66
Author(s):  
Dinh Anh Khoi Pham
Keyword(s):  
Frequency Response ◽  
Power Transmission ◽  
Power Transformer ◽  
International Standards ◽  
Power Transformers ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Frequency Responses ◽  
Measured Frequency ◽  
Transformer Winding

CIGRE, IEC and IEEE have recently approved the technique of Frequency Response Analysis (FRA) as an application tool for diagnosis of mechanical failures in power transformer’s active part, i.e., windings, leads and the core. The diagnosis is based on the discrepancy between frequency responses measured on power transformers mainly at different time points. In Vietnam, utilities such as Power Transmission Companies and Power Corporations are investigating this technique for application on their power transformers. Mechanical failures in power transformers cause changes on measured frequency responses starting from a medium frequency range, from several hundreds of Hz or tens of kHz depending on transformer/winding type and power. For a reliable diagnosis, the understanding of transformer/winding structure on measured frequency responses is of importance; thus, the international standards suggested the simulation approach with physical distributed transformer circuits should be exploited. The development of physical distributed circuits of power transformers normally needs availability of internal transformer structure and material properties for an analytical approach. However, for in-service power transformers, this task is challenging since the required data are not available. For a feasible application of the simulation based FRA interpretation, this paper introduces an investigation on the development of a distributed equivalent circuit of an in-service 6.5 MVA 47/27.2 kV Yd5 power transformer. The result of this investigation is a feasible approach in determining electrical parameters in a physical distributed circuit, which supports analysis of frequency responses measured at transformer terminals for real application on in-service power transformers of utilities.

scholarly journals Response Test of Power Transformer Windings Excited by Nanosecond Pulse

2021 ◽  
Author(s):  
Xinhe Liu ◽  
Wenwu Hang ◽  
Haitao Wu
Keyword(s):  
Frequency Response ◽  
Power Transformer ◽  
High Reliability ◽  
Pulse Frequency ◽  
Nanosecond Pulse ◽  
Response Analysis ◽  
Analysis Method ◽  
Frequency Response Analysis ◽  
Transformer Winding ◽  
Winding Deformation

At present, the detection of transformer winding deformation in the offline phase, in order to discover the small transformer winding deformation, realize the online monitoring, in this paper, using nanosecond pulse frequency response analysis method, the detection of transformer winding deformation is studied, the results show that the nanosecond pulse frequency response analysis method in the detection of transformer winding deformation with high reliability and sensitivity.In order to verify the repeatability of the method, the method was used again at a 30-day interval under the condition that the detection environment was basically unchanged. The ρ value was 0.9719 in the range of 1 kHz∼1 MHz.

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
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