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Interoperability of Line Differential Protection
2021 74th Conference for Protective Relay Engineers (CPRE), 2020Line differential protection is used for a long time to protect overhead lines and cables in transmission and distribution systems. The basic principle of line differential protection is Kirchhoff’s current law. Due to this principle line differential protection is strictly selective to clear faults on the protected line.To apply Kirchhoff’s current ...
J. Blumschein, T. Kerger, R. Matussek
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A novel differential protection scheme for AC microgrids based on discrete wavelet transform
Electric power systems research, 2023Amir Hossein Nazari Tajani +2 more
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On protection and vertical product differentiation
Regional Science and Urban Economics, 2000Abstract This paper analyzes the effects of trade barriers on the degree of vertical product differentiation in a model of spatial competition with two interdependent markets. It is shown that with specific trade barriers, firms produce the same product variety, always provided that the level of protection is sufficiently high. When there is trade in
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High Impedance Differential protection system versus Low Impedance Differential protection system
2015 68th Annual Conference for Protective Relay Engineers, 2015High Impedance Differential (HID) is a classical busbar protection system that has provided a high degree of reliability in worldwide use over the past six decades. During the past five years, however, there has been a growing movement to replace HID with state-of-the-art numerical Low Impedance Differential (LID) protection systems.
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International Journal of Electrical Power & Energy Systems, 2019
The Hausdorff distance (HD) algorithm has superiorities in the recognition of waveform similarity. On this basis, a novel criterion based on the HD algorithm applicable to transformer differential protection is put forward in this paper.
Weng Hanli +4 more
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The Hausdorff distance (HD) algorithm has superiorities in the recognition of waveform similarity. On this basis, a novel criterion based on the HD algorithm applicable to transformer differential protection is put forward in this paper.
Weng Hanli +4 more
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Differential Protection for Converter Transformers
12th IET International Conference on Developments in Power System Protection (DPSP 2014), 2014This paper will present differential protection schemes used for special Converter Transformers. These transformers are typically used to feed MV drives, power electronic or FACTS devises. Converter transformers are industrial power transformers which may have phase angle shift different from standard 30o or a multiple of 30o.
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An improved differential protection scheme for micro-grid using time-frequency transform
International Journal of Electrical Power & Energy Systems, 2019This study presents an improved threshold-based differential protection scheme for micro-grids using time-frequency transform. Variational mode decomposition (VMD) in combination with Hilbert transform is used as the time-frequency transform.
B. K. Chaitanya +2 more
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Differential protection of microgrids with central protection unit support
IEEE 2013 Tencon - Spring, 2013Deployments of Distributed Generators (DGs) have large impacts on the structure of electrical networks. In order to tackle these issues, the `Microgrid' concept has been proposed. However, due to their unprecedented structure, these smaller grids experience very significant protection issues. Conventional fault current protection schemes cannot be used
Taha Selim Ustun +2 more
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International Journal of Electrical Power & Energy Systems, 2019
Being free from the influences of the transmission characteristics, the current and voltage near a fault point can better reflect the fault features.
X. Chu
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Being free from the influences of the transmission characteristics, the current and voltage near a fault point can better reflect the fault features.
X. Chu
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Current-differential protective schemes
1993It will be clear from the previous chapter that overcurrent and earth fault protective equipment employing time grading and directional detection cannot provide correct discrimination on all power networks and in many instances the clearance times for some faults would not be acceptable.
C. Christopoulos, A. Wright
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