Unbalance Current Detection for Synchronous Generator Using Alienation Concept
R. Abd Allah

Dr. Ragab Abd Allah, Chairman, Department of Electrical Engineering, Buraydah Private Colleges (BPC), Qassim Region, Kingdom of Saudia Arabia.
Manuscript received on 15 February 2016 | Revised Manuscript received on 25 February 2016 | Manuscript Published on 28 February 2016 | PP: 152-162 | Volume-5 Issue-3, February 2016 | Retrieval Number: C4452025316/16©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: In modern digital power protection systems, statistical coefficients technique is recently used for fault analysis. An alienation technique is developed for protecting synchronous generators against unbalance currents conditions. The proposed technique is able to accurately identify the conditions of unbalance phase(s) currents involved in all different types of shunt faults that may locate on stator windings of synchronous generator. Case studies are processed under different loading levels, fault resistances and fault inception angles. It does not need any extra equipment as it depends only on the three-line currents measurements which are mostly available at the relay location. This technique is able to detect the unbalance current conditions, in about a one-cycle period. Thus, the alienation technique is well suited for implementation in digital protection schemes. The proposed methodology is applied for El-kuriemat power station unit that produces 320 MVA and a part of 500 KV Egyptian network. Alternative transient program (ATP) and MATLAB programs are used to implement the proposed technique.
Keywords: Generator Protection, Unbalance Currents, Alienation Coefficient, Internal And External Fault..

Scope of the Article: Low-Power Design