نتایج جستجو برای: wavelet transformer

تعداد نتایج: 49572  

2013
Sina Mehdizadeh Mohammadreza Yazdchi Mehdi Niroomand

In this paper, a novel algorithm for PD localization in power transformers based on wavelet de-noising technique and energy criterion is proposed. Partial discharge is one of the main failures in power transformers. The localization of which could be very useful for maintenance systems. Acoustic signals due to a PD event are transient, irregular and non-repetitive. So wavelet transform is an ef...

Transformer oil is one of the most important materials which are used in electrical and transformer industrial. The main function is protection and insulation of transformer core components, as well as heat transfer from its core to environment. Improving the performance of this material has been one of the researchers' concerns. The effect of different nanoparticle on the electrical breakdown ...

2016
Caijun Xu Liping Zhang Yuchen Chen Zhifeng Liu

in working process of power transformer, which directly affects the safe operation of transformer oil temperature as well as the stability of the network, so vital to transformer oil temperature detection and control. Based on single chip and chip design of digital temperature measurement transformer oil temperature of an intelligent control system. The system uses a digital temperature sensor ...

In this paper, a new model based on the thevenin equivalent circuit for investigating the ultra-saturation phenomenon during the energization of a loaded power transformer is presented and its effect on the differential protection of the transformer is considered. The ultra-saturation phenomenon causes the mal-operation of the power transformer differential protection. So, the description a...

2005
Pat Bodger

An overview of the research and developments into new transformer design, undertaken in the Department of Electrical and Computer Engineering, University of Canterbury, is presented. Initially, single phase, 50 Hz, l1/0.23kV pole mount distribution transformers were fitted with either silicon or amorphous steel cores. The transformer tanks were filled with either standard transformer oil or liq...

2013
Mohammed Abdul Rahman Uzair Mohammed Mohiuddin Mohammed Khaja Shujauddin

This paper deals with three types of power transformer failure analysis tests which can help in monitoring the transformer condition. The three methods are Conventional oil test, Furan derivatives test and Markov models criteria. Conventional oil testing procedure includes determination of gas concentrations in the transformer oil sample and analyzing the fault by considering ratio of two suita...

Journal: :Journal of Marine Science and Engineering 2022

As an image processing method, underwater enhancement (UIE) plays important role in the field of resource detection and engineering research. Currently, convolutional neural network (CNN)- Transformer-based methods are mainstream for UIE. However, CNNs usually use pooling to expand receptive field, which may lead information loss that is not conducive feature extraction analysis. At same time, ...

2005
Hendrik Eeckhaut Dirk Stroobandt

In the RESUME project (Reconfigurable Embedded Systems for Use in Multimedia Environments) we explore the benefits of an implementation of scalable multimedia applications using reconfigurable hardware by building an FPGA implementation of a scalable wavelet-based video decoder. The term ‘scalable’ refers to a design that can easily accommodate changes in quality of service with minimal computa...

Journal: :Entropy 2015
Jikai Chen Yanhui Dou Zhenhao Wang Guoqing Li

Partial discharge (PD) detection can effectively achieve the status maintenance of XLPE (Cross Linked Polyethylene) cable, so it is the direction of the development of equipment maintenance in power systems. At present, a main method of PD detection is the broadband electromagnetic coupling with a high-frequency current transformer (HFCT). Due to the strong electromagnetic interference (EMI) ge...

Journal: :SSRG international journal of electrical and electronics engineering 2023

The Oil-Impregnated Paper (OIP) insulation is commonly utilized as the foremost type in case of a converter transformer, which constantly and unavoidably affected by elevated temperature different stresses arising during mode operation. It causes safety risk to system transformer. Because this, present study examines effect on OIP using FDS technique function frequency temperature. Frequency Do...

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