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Design Criteria for Line Differential Current Protection Scheme
2021 IEEE/IAS 57th Industrial and Commercial Power Systems Technical Conference (I&CPS), 2021Line current differential protection creates challenges for relay design and application. From a design perspective, the distributed nature of the line current differential system imposes limits on the differential current to enable the differential protection principle.
Naman Dwivedi, Manish Mishra
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Harmonic-Current-Restrained Relays for Transformer Differential Protection
Transactions of the American Institute of Electrical Engineers, 1941Differential protection, employing percentage-differential relays, has1 long been the accepted method of fault protection for large power transformers. This method, illustrated by the schematic diagram, figure 1, is quite satisfactory in most respects but is subject to false tripping on the transient magnetizing-inrush current which flows when the ...
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A new current differential protection relay for protection of transmission lines
7th IET International Conference on Advances in Power System Control, Operation and Management (APSCOM 2006), 2006This paper describes a new current differential relay with an improved characteristic. A current differential plane is presented firstly to depict different system statuses. Two traditional current differential protection schemes are discussed by plotting their operating and restraint region in the current- differential plane.
null Haigang Wang +5 more
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Adaptive current differential protection for transmission lines
Eighth IEE International Conference on Developments in Power System Protection, 2004This paper proposes an adaptive current differential principle with high performance and high reliability, which combines instantaneous value with fault component instantaneous value. In the principle, the parameters change adaptively with the dynamic variations of power system.
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New Current Transformer for Bus Differential Proteection
Transactions of the American Institute of Electrical Engineers, 1941Perfect current transformers would make all differential relaying simple, but such transformers would be of excessive size and cost. A new idea in current transformer design makes it possible to maintain a linear relation between primary and secondary currents in a transformer and reasonable size, even where high current values, completely offset, are ...
L. F. Kennedy, A. T. Sinks
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Agent-based wide area current differential protection system
Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005., 2005This paper proposes a multi-agent based wide-area current differential protection system. The power grid is divided into primary and backup protection zone dynamically online with the help of a developed expert system, and the relay agents of these zones cooperate to perform a differential relaying function. Predictive self-healing strategies have been
null Su Sheng +4 more
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Digital Communication for Current Differential Protection Schemes
HKIE Transactions, 2003The overwhelming majority of the more than 200,000 differential relays that are in worldwide operation today use pilot cables as their cammunication media. The advances in telecommunications frequency make a change of the complete protection system concept necessary. Modern digital communicatians have entered the substation.
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Circulating-current pilot-wire differential protection system
Proceedings of the Institution of Electrical Engineers, 1967A circulating-current a.c. pilot-wire differential protection scheme is described in which compensation is provided for the phase shift of the fundamental-frequency signals transmitted over the pilot-wire circuit. Alternative relay characteristics are considered, with particular reference to the desirability of maintaining simultaneous tripping of ...
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A Novel Criterion for Neutral Current Differential Protection
Proceedings of the 41st International Universities Power Engineering Conference, 2006A novel criterion for neutral current differential protection is presented in this paper, which is based on a full research into exist neutral current differential protection schemes used in transmission lines. Compared to traditional ones, the novel criterion can improve the sensitivity under internal fault conditions and improve reliability under ...
Min Zhang +5 more
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Development of GPS synchronized digital current differential protection
POWERCON '98. 1998 International Conference on Power System Technology. Proceedings (Cat. No.98EX151), 2002This paper describes a newly developed digital current differential protection scheme for power transmission lines. The proposed protection is different from existing ones in two aspects: one is the use of GPS time information to implement synchronized sampling at all terminals of the protected line; the other is the application of a new differential ...
null Gao Houlei +2 more
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