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Published Article / ENY-ARTICLE-2008-147

Prediction of CT saturation period for differential relay adaptation purposes

Rebizant, W (Wroclaw University of Technology, Poland) ; Hayder, T (University of Stuttgart, Germany) ; Schiel, L (Siemens AG, Germany)


Abstract: A new approach to CT saturation assessment is presented in the paper. Detailed algorithms for decaying DC component measurement and CT saturation prediction are proposed and their accuracy is discussed. The information on CT saturation period is further used for adaptation of the generator / transformer differential protection. Improved stabilization for external faults is achieved by appropriate temporal adjustment of the differential curve for the time period of CT saturation. The protection developed was tested with both EMTP-generated and real world registered current signals.

Keyword(s): CT saturation ; differential protection ; digital signal processing ; measurement of decaying DC parameters ; synchronous machine ; transformer
Note: Proceedings of the 1st International Conference on Advanced Power System Automation and Protection, APAP2004, Jeju, Korea, 25-28 Oct. 2004, pp. 17-22.

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Record created 2008-05-03, last modified 2008-05-04

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