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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)

Example text

Examples of protection systems operating using Rogowski Coil current sensors are described in later sections of this paper. 40 Moscow, 7–10 September 2009 cm Primary Current Terminal Blocks 10 30 c m Weight: 90 kg 64 c Heavy Gauge Wires (a) Current Transformer m 2000/5 A, C800 Current Transformer Printed Circuit Board Rogowski Coil Primary Current Multi-Function Relay Shielded Cable and Connectors 30 cm Wi dt Weight: 2 kg h2 cm (b) Rogowski Coil Multi-Function Relay Fig. 1. S. to supply reliable power to densely loaded urban areas.

In addition, multiple slopes are not required. Transformer inrush currents are determined using a current waveform recognition algorithm. Protection settings can be at a lower current threshold compared to conventional solutions based on CTs. The load tap changer position is also used by the relay to adaptively adjust the transformer ratio allowing the set threshold to be further reduced. 4. Busbar Protection Rogowski Coils can provide reliable protection for all types of bus bars and at any fault current level.

3. Fault Location Unit Fault Location Unit process the results from the detection unit. Classification unit and Fault Location Unit are working in parallel as illustrated in Figure (3). 1. e. single phase to ground, phase to phase, double phase to ground or three-phase fault) with inception fault time (Tf) 2 msec. and fault resistances (Rf) 0, 25, 50 and 100 ohms. There are 444 training data. The input data to the ANFIS of the location unit are as same as those of the ANFIS of the classification unit without the zero sequence current.

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