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Computer system for casting defects classification based on Polish, French and Czech specifications

100%

Adrian A. , Durak J. , Mrzygłód B. , Kluska-Nawarecka S. , Miłkowska K. , Wilk-Kołodziejczyk D.

tom Vol. 9, iss. 3

5-8

Many foundries existing in Poland make casts for local and external market. It is necessary to adopt a quality control to client's requirements. The main problem in the quality control of casting products is to detect and to classify properly defects. Polish defect classification is base nod the Polish Norm. In other countries (Czech Republic and France for example), other systems exist for classification, they are based on the different criteria and groups of defects. In other word the classification of casting defects is country-specific. Translation of defects names and their descriptions introduce additional level of difficulties. The authors propose multi-context system for finding equivalents of casting defects from one classification system to another, using original languages for each classification.

Communication assisted fuzzy based adaptive protective relaying scheme for microgrid

67%

Chaitanya B. K. , Soni A. K. , Yadav A.

tom Vol. 98, nr 1

57--69

This study proposes a communication assisted fuzzy based adaptive protective relaying scheme for fault detection, fault classification and faulty phase identification of microgrid along with a solution to isolate the microgrid from the utility grid by disconnecting the static-switch. Any fault in the utility grid causes the microgrid to be isolated from the utility grid whereas if there is a fault in the microgrid it continues to operate with the utility grid. An adaptive fuzzy inference system has been developed using a separate fuzzy rule base for the two modes of operation of microgrid, i.e. islanded mode or grid connected mode. The Central Grid Status Communication System (CGSCU) is considered which monitors the status of PCC and sends a command signal to the relays so that the relay settings are updated with new rules for any transition in the mode of the microgrid. The fundamental phasor amplitude and zero sequence component of current signals are used as input features, fault detection, fault classification and faulty phase identification. A standard microgrid model IEC 61850-7-420 was simulated using MATLAB/SIMULINK. The proposed method is tested for all types of faults by varying fault parameters and also for dynamic situations such as connection/disconnection of DGs and loads. The test results substantiate the effectiveness of the method.