An adaptive scheme for digital protection of power transformers

Girgis, A.A.; Hart, D.G.; Chang, Wei-Shiou

doi:10.1109/pica.1991.160643

Cited by 6 publications

(5 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the application of digital protection technology, historical buildings can be better integrated into modern society and truly achieve sustainable development. Digital technology can be used for the management protection and restoration protection of historical buildings [ 14 ]. Among them, the former mainly refers to the platform or system that provides digitization and informatization, and this kind of informatization system is unified management and adjustment by relevant departments or organizations.…”

Section: Digital Technology and Historic Building Protectionmentioning

confidence: 99%

[Retracted] Digital Protection of Historic Buildings in Urban Planning

Wei

Wang

2022

Journal of Environmental and Public Health

View full text Add to dashboard Cite

With the rapid development of urbanization, urban land has been expropriated and developed on a large scale. Moreover, people’s awareness of the protection of historical buildings is relatively weak, so some historical buildings have been demolished or rebuilt. Historical buildings have played an important role in the spread of national culture, so how to use some methods to protect historical buildings from being destroyed has become an urgent problem to be solved. The protection of historical buildings includes a series of complicated and rigorous procedures, such as on-site drawing and mapping, survey and design, and scheme discussion and construction. The surveying and mapping of traditional historical buildings require people to do it by themselves, so it is inevitably time-consuming and labor-intensive. This paper first discussed and analyzed the significance of historical building protection, and then used digital technology to make up for the shortcomings of traditional manual surveying and mapping and historical building protection methods. Modern technologies such as three-dimensional laser scanning technology and virtual reality technology are used to restore the style and appearance of historical buildings. Among them, in terms of the color of historical buildings, the restoration degree of buildings based on digital protection technology has reached 56.1%; at the same time, the efficiency of information collection and processing, and virtual model construction has also been improved. Thus, the ultimate goal of historical building protection is achieved, and it provides a reference for the digital protection of historical buildings.

show abstract

Section: Digital Technology and Historic Building Protectionmentioning

confidence: 99%

[Retracted] Digital Protection of Historic Buildings in Urban Planning

Wei

Wang

2022

Journal of Environmental and Public Health

View full text Add to dashboard Cite

show abstract

“…The appropriate model for the current depends on the operating status of the transformer. In switching the power transformer, over-excitation may occur owing to the inrush current (Girgis and Hart, 1992). The harmonic structure is used to differentiate between an over-excitation resulting from an inrush and that resulting from a fault.…”

Section: Protection Of Power Transformersmentioning

confidence: 99%

Adaptive harmonic estimation for power system protection

Haweel

2000

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

View full text Add to dashboard Cite

Many power system protection problems necessitate the measurement and track of the underlying current/voltage phasors. Adaptive LMS spectrum analyzers provide an ideal solution to such problems. This paper introduces a class of adaptive trigonometric spectrum analyzers. The underlying current/voltage is fed as a desired signal to an LMS adaptive algorithm. The reference input is a periodic regression derived from the basis set of the specified trigonometric discrete transform. The proposed algorithm is simple, computationally efficient, and exhibits a guaranteed stability and uniform convergence. A comparative study recommends the discrete Hartley transform. Simulations are provided to prove that the proposed spectrum analyzer is efficient in modeling faulty power system currents/voltages such as these arising from an over-excitation of a power transformer.

show abstract

“…A very limited number of resources are available which addresses the said problem of achieving high level of accuracy without reducing the relay sensitivity during internal faults [4][5][6][7][8]. Girgis et al [4] proposed an adaptive scheme for digital differential protection of power transformer using Kalman filter.…”

Section: Introductionmentioning

confidence: 99%

“…Girgis et al [4] proposed an adaptive scheme for digital differential protection of power transformer using Kalman filter. However, the prime limitation of Kalman filtering based algorithm is that it requires previous knowledge of system and measuring equipments in order to produce best possible estimate of the variables.…”

Section: Introductionmentioning

confidence: 99%

A New Adaptive Differential Protection Scheme for Tap Changing Power Transformer

Shah¹,

Bhalja

2015

International Journal of Emerging Electric Power Systems

View full text Add to dashboard Cite

This paper presents a new adaptive differential protection scheme which efficiently adapts the change in tap position of a power transformer. The proposed scheme is based on analytical derivation of pick-up and slope of the differential relay characteristic. By acquiring information such as rating & connection of CTs and present tap position as input, the proposed scheme enhances sensitivity of differential relay during internal faults. This is accomplished either by decreasing pick-up and/or adjusting slope of the differential characteristic of the relay in case of change in tap position. Numerous test cases consisting of various types of internal and external faults have been simulated for an existing power transformer of Gujarat Energy Transmission Corporation Limited (GETCO), Gujarat, India using PSCAD/EMTDC software package. The proposed scheme increases percentage of winding to be protected during internal faults for power transformers having different ratings and connections compared to the conventional differential protection scheme. Furthermore, it has been observed that the detection sensitivity during special types of turn-to-turn and inter-winding faults with varying fault resistances is also enhanced compared to the conventional scheme. Moreover, it equally maintains stability during CT saturation condition. At the end, comparative evaluation of the proposed scheme with the existing schemes clearly indicates superiority of the proposed adaptive scheme.

show abstract

An adaptive scheme for digital protection of power transformers

Cited by 6 publications

References 16 publications

[Retracted] Digital Protection of Historic Buildings in Urban Planning

[Retracted] Digital Protection of Historic Buildings in Urban Planning

Adaptive harmonic estimation for power system protection

A New Adaptive Differential Protection Scheme for Tap Changing Power Transformer

Contact Info

Product

Resources

About