نتایج جستجو برای: transformer protection scheme

تعداد نتایج: 408229  

2016
Xiangning Lin Junsheng Lu Qing Tian Hanli Weng Zhengtian Li Chongli Tong Ming Li Jinwen Sun Dexian Yang

Intriguing mal-operations and fail-to-trip of the differential protection of the converter transformer in the HVDC system are reported. In this paper, the mechanism of these abnormal operation behaviors is analyzed. By virtue of deliberately designed models of the converter transformer and the HVDC transmission system, a variety of simulation tests are carried out and above mentioned strange op...

Journal: :Journal of Electrical Systems and Information Technology 2022

Abstract The entire article has been dedicated to cover the current state of art in bidirectional DC-DC converter topologies and its smart control algorithms, identified research gaps concluded with motivation for taking up work. It covers literature survey buck–boost converters, schemes are carried out on two aspects, one is topology perspective another schemes. Different without transformers ...

2011
Xudong Zhang Alex Echeverria

Autotransformers (ATs) have been widely used for many years. For large size ATs, a tertiary winding is usually included. Sometimes the tertiary winding is loaded for station service, local loads, VAR compensation, etc. Other times, the tertiary winding is buried and acts as stabilizing winding which provides a path for zero-sequence current and 3rd harmonic current. Three-winding ATs present so...

Journal: :Energies 2021

Complex phase shifting transformer protection scheme and complexity of the object itself created a need to use simulation programs for their analysis. Often (PST) are modeled as simplified series impedance quadrature voltage source which cannot be used power system analysis, especially in transient condition. Therefore, procedure building realistic PST model was presented by using available mod...

Journal: :IEEE Access 2023

The reliability of the transformer differential protection is under threat from multiple interferences, including inrush condition, current saturation and arc fault condition. For improvement, a new method proposed to discriminate conditions other non-fault conditions. Firstly, identifies unidirectional via index, since only it exhibits characteristic. Then, remaining signals are classified by ...

2007
Ebenezer Jeyakumar

This paper presents an efficient wavelet and neural network (WNN) based algorithm for distinguishing magnetizing inrush currents from internal fault currents in three phase power transformers. The wavelet transform is applied first to decompose the current signals of the power transformer into a series of detailed wavelet components. The values of the detailed coefficients obtained can accurate...

2013
Muhammad Shoaib ALMAS Luigi VANFRETTI

With the evolution of Process Bus (IEC 61850-9-2), there is a need to assess the performance of protection schemes using process bus against those where traditional copper wires are implemented. Differential protection is the fundamental and most commonly used protection for transformers, motors and generators. In this paper a power system is modelled in SimPowerSystems and is executed in real-...

2015
P. Mercy N. Uma Maheswari S. Deepika Devi V. Dhamodharan

Abstract: Power transformers are one of the most important electrical equipment that are used in power transmission system as they perform the function of transforming the voltage levels. Hence maintenance of power transformer is mandatory; as they are located at different geographical areas periodical monitoring is not possible all the time due to insufficient man power. Due to this reason tra...

2012
Rafael B. Rodrigues Victor M. F. Mendes João P. S. Catalão

This paper is concerned with the protection of wind energy systems against the direct effects of lightning. As wind power generation undergoes rapid growth, lightning damages involving wind turbines have come to be regarded as a serious problem. Nevertheless, very few studies exist yet in Portugal regarding lightning protection of wind energy systems using numerical codes. A new case study is p...

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