Actual Trends in Development of Power System Protection and

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Extra resources for Actual Trends in Development of Power System Protection and Automation: Conference Proceedings of International Scientific & Technical Conference (Moscow, September 7–10, 2009)

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39 Actual Trends in Development of Power System Protection and Automation Indoor Applications (b)(b) Outdoor (a)(a) Indoor Applications OutdoorApplications Applications Fig. 3: Two3 Non-Split-Core Rogowski Designs Figure Two Non-Split-Core PCB PCB Rogowski Coil Coil Designs Fig. 4: One Split-Core RogowskiCoil Coil Design Figure 4 One Split-CorePCB PCB Rogowski Design (a) Rogowski Coil mounted around six conductors (b) Rogowski Coil mounted on one large conductor Fig. 4. Interface to relays Current transformers require heavy gauge secondary wires for interconnection to relays and other metering and control equipment (Figure 6a).

The proposed Artificial Intelligent Approach for distance relay demonstrates successful performance for the three main protection tasks. For the fault detection task, all the testing data for the ANFIS detector in the fault and no fault conditions give the correct output within the given periods that mentioned before. For the fault classification task, all the testing data for the ANFIS classifier gives the correct output number which represents the fault types for the fault location task, all the testing data for the ANFIS locator gives a maximum error 8% for different fault resistances, different fault inception times and different fault types.

This may result in a mismatch of primary to secondary current of 30% for a relay set at a fixed ratio setting at the mid point of the range. To provide a sensitive differential protection scheme that can detect low fault In-Zone currents, the relay must be able to adapt to changing taps during transformer operation. The third challenge is to provide reliable operation of the scheme for distorted current waveforms during the arcing process in an EAF. The non-linear characteristic of the arc, plus the erratic nature of the continuity of the arc in the scrap, results in high percentages of lower order harmonics.

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