scholarly journals Numerical calculation of the lightning transient voltage distribution on converter transformer winding based a dual winding model

2019 ◽  
Vol 2019 (16) ◽  
pp. 3012-3016
Author(s):  
Hongrui Jia ◽  
Xuezhong Liu ◽  
Shijin Tian ◽  
Lin Wang ◽  
Fei Gao
Keyword(s):  
Numerical Calculation ◽  
Voltage Distribution ◽  
Transformer Winding ◽  
Transient Voltage

Estimation of Transformer Winding Capacitances through Frequency Response Analysis – An Experimental Investigation

2013 ◽  
Vol 14 (6) ◽  
pp. 549-559 ◽  
Author(s):  
Krupa Shah ◽  
K. Ragavan
Keyword(s):  
Frequency Response ◽  
Wide Frequency Range ◽  
Response Analysis ◽  
Voltage Distribution ◽  
Response Data ◽  
Non Invasive ◽  
Transformer Winding ◽  
Invasive Method ◽  
Ladder Network ◽  
Good Agreement

Abstract This article focuses on developing a non-invasive method for determining capacitances using frequency response data. The proposed methodology involves acquiring driving-point impedance of the winding under consideration over wide frequency range. With certain terminal conditions and using the terminal impedance measured at specific frequencies, input and shunt capacitances are determined. For the purpose of estimating series capacitance of the winding, an algorithm is proposed. To demonstrate the capability of the method, initially model coils that have provisions for connecting external capacitances are considered. Then, it is found that the estimated values of capacitances are nearly same as those of connected capacitances. The method is, then, extended to transformer winding, and a capacitive ladder network is constructed. To assess the accuracy of estimation, capacitive voltage distribution is utilized. That is, the voltage distribution in the winding is compared with that of synthesized circuit. A good agreement between those data reveals that the estimated capacitance values are accurate.

Transformer Modelling for Impulse Voltage Distribution and Terminal Transient Analysis

2013 ◽  
pp. 239-320
Author(s):  
Marjan Popov ◽  
Bjørn Gustavsen ◽  
Juan A. Martinez-Velasco
Keyword(s):  
Black Box ◽  
Electromagnetic Transients ◽  
Main Section ◽  
Laboratory Measurements ◽  
Voltage Distribution ◽  
Box Models ◽  
Transformer Winding ◽  
Lightning Discharges ◽  
Transient Events ◽  
Black Box Models

Voltage surges arising from transient events, such as switching operations or lightning discharges, are one of the main causes of transformer winding failure. The voltage distribution along a transformer winding depends greatly on the waveshape of the voltage applied to the winding. This distribution is not uniform in the case of steep-fronted transients since a large portion of the applied voltage is usually concentrated on the first few turns of the winding. High frequency electromagnetic transients in transformers can be studied using internal models (i.e., models for analyzing the propagation and distribution of the incident impulse along the transformer windings), and black-box models (i.e., models for analyzing the response of the transformer from its terminals and for calculating voltage transfer). This chapter presents a summary of the most common models developed for analyzing the behaviour of transformers subjected to steep-fronted waves and a description of procedures for determining the parameters to be specified in those models. The main section details some test studies based on actual transformers in which models are validated by comparing simulation results to laboratory measurements.

Study on the Methodology of Detection for Transformer Winding Insulation Defects Based on Impulse Test

2013 ◽  
Vol 805-806 ◽  
pp. 863-866
Author(s):  
Yu Sheng Quan ◽  
Dai Juan Wang ◽  
Hua Gui Chen ◽  
Zong Cheng Zhang
Keyword(s):  
Ratio Method ◽  
Half Wave ◽  
Insulation Defect ◽  
Impulse Voltage ◽  
Transformer Winding ◽  
Lightning Impulse ◽  
Harmonic Voltage ◽  
Transient Voltage ◽  
The Moment ◽  
Winding Insulation

A methodology of diagnosing the winding insulation defect according to data of transient voltage and current from the impulse voltage test is put forward in this paper. Lightning impulse test for transformer is divided into half-wave and full-wave at the moment. According to the full voltage and reduced voltage at two pressure processes. The transient voltage and current from the impulse voltage test can be divided into Series of harmonics. The insulation defect is diagnosed by dividing impulse voltage and current into series of harmonic and structuring discriminant function according to the longitudinal ratio method and cross ratio method for the corresponding period of harmonic voltage and current. The methodology is also applicable to diagnose whether there are insulation damage in the windings those have passed the lightning impulse test.

Solution for Voltage Distribution in Transformer Winding Model

2009 ◽  
Author(s):  
Chun Zhao ◽  
Jiangjun Ruan ◽  
Zhiye Du ◽  
Liang Chen ◽  
Ling Ruan ◽  
...  
Keyword(s):  
Voltage Distribution ◽  
Transformer Winding
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