Analysis on Behaviour of Wavelet Coefficient during Fault Occurrence in Transformer

2017 International Conference on Renewable Energy and Environment

能源学;生态环境科学

Sreewirote, Bancha^1 ; Ngaopitakkul, Atthapol^2

Department of Electrical Engineering, Faculty of Engineering, Thonburi University, Bangkok, Thailand^1

Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand^2

关键词: Classification algorithm;    Fault conditions;    Low-frequency components;    Protection schemes;    Protection systems;    System reliability;    Wavelet characteristics;    Wavelet coefficients;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/127/1/012008/pdf
DOI  :  10.1088/1755-1315/127/1/012008

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The protection system for transformer has play significant role in avoiding severe damage to equipment when disturbance occur and ensure overall system reliability. One of the methodology that widely used in protection scheme and algorithm is discrete wavelet transform. However, characteristic of coefficient under fault condition must be analyzed to ensure its effectiveness. So, this paper proposed study and analysis on wavelet coefficient characteristic when fault occur in transformer in both high- and low-frequency component from discrete wavelet transform. The effect of internal and external fault on wavelet coefficient of both fault and normal phase has been taken into consideration. The fault signal has been simulate using transmission connected to transformer experimental setup on laboratory level that modelled after actual system. The result in term of wavelet coefficient shown a clearly differentiate between wavelet characteristic in both high and low frequency component that can be used to further design and improve detection and classification algorithm that based on discrete wavelet transform methodology in the future.