Results 261 to 270 of about 1,138,456 (310)
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A Solution to CT Saturation by Gregory Newton's Backward Interpolation
International Journal of Emerging Electric Power Systems, 2011Saturation problem in steel core Current Transformers (CTs) causes dreadful effects in protection systems as true replica of the primary current is not always reflected in CT secondary side under abnormal operating conditions. This is why detection and production of exact replica of primary current in the CT secondary side is very crucial.
Sukanta Das +2 more
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The impact of the CT saturation on the HVDC protection and its countermeasure
IEEJ Transactions on Electrical and Electronic Engineering, 2017Converter protection, including bridge differential protection and valve short‐circuit protection, frequently malfunctions during the disturbance from an AC system, such as the short‐circuit fault and the inrush current, which severely threatens the safe and stable operation of an AC/DC hybrid power system.
Wenbin Cao +5 more
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Optical current sensors eliminate CT saturation
2002 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.02CH37309), 2003Optical current sensors are achieving increased acceptance and use in high voltage substations due to their superior accuracy, bandwidth, dynamic range and inherent isolation. Once deemed specialized devices intended for novel applications, optical sensors have risen to a performance level exceeding conventional magnetic devices.
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Phasor Estimation in the Presence of DC Offset and CT Saturation
IEEE Transactions on Power Delivery, 2009A hybrid algorithm for phasor estimation is proposed that is immune to DC offset and current transformer (CT) saturation problems. The algorithm utilizes partial sum (PS)-based and multistage least-squares (MLS)-based methods before and after CT saturation is detected, respectively.
Soon-Ryul Nam +3 more
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New Method to Identify CT Saturation Based on EMD
Advanced Materials Research, 2013Aiming at the problem that Current Transformer (CT) affects differential protection, this paper proposes a new method to identify CT saturation based on Empirical Mode Decomposition (EMD). Differential current can be decomposed into few Intrinsic Mode Functions (IMFs) by EMD.
Wen Hua Xia +4 more
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Beyond the knee point: A practical guide to CT saturation
2018 71st Annual Conference for Protective Relay Engineers (CPRE), 2018Current transformer (CT) saturation, while a fairly common occurrence in protection systems, is not often clearly understood by protective relay engineers. This paper forgoes the usual physics equations to describe how CTs saturate in a simple and intuitive way.
Ariana Hargrave +2 more
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A busbar protection technique and its performance during CT saturation and CT ratio-mismatch
IEEE Transactions on Power Delivery, 2000This paper describes a digital technique for protecting busbars. The technique uses positive- and negative-sequence models of the power system in a fault-detection algorithm. While phase voltages and currents are used to detect faults, parameters of the power system are not used.
M.S. Sachdev, T.S. Sidhu, H.S. Gill
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An adaptive differential relay for CT saturation based on wavelet Transform
IEEE PES T&D 2010, 2010Differential protection relays may false tripping for external faults due to current transformer saturation (CT). This paper presents an adaptive technique for transformer differential protection against saturation of current transformers, based on differential currents. A Wavelet Index (WI) by wavelet Transform has been devised using extracted feature
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A new differential protection scheme for busbar considering CT saturation effect
2011 24th Canadian Conference on Electrical and Computer Engineering(CCECE), 2011The protection of busbar demands high integrity and high speed relaying scheme. This paper presents a new differential relaying scheme for the protection of busbar. The proposed scheme depends on the difference of the value of incoming and outgoing line currents of the respective phase at a particular bus.
Nilesh Chothani, Bhavesh R. Bhalja
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Distance Element Performance Under Conditions of CT Saturation
2008 61st Annual Conference for Protective Relay Engineers, 2008Distance elements are widely used on transmission, subtransmission, and even distribution systems. Distance-based schemes are also a very economical and simple approach to protecting these lines. The ease of use of distance elements, especially in modern digital relays, has expanded the application to shorter and shorter lines.
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