By Mladen Kezunovic, Jinfeng Ren, Saeed Lotfifard
This booklet is a pragmatic consultant to electronic protecting relays in energy structures. It explains the idea of the way the protecting relays paintings in strength structures, presents the engineering wisdom and instruments to effectively layout them and gives professional suggestion on how they behave in useful situations. This e-book is helping readers achieve technical mastery of the way the relays functionality, how they're designed and the way they practice. this article not just good points in-depth assurance of the idea and ideas at the back of protecting relays, but in addition incorporates a handbook supplemented with software program that provides various hands-on examples in MATLAB. a superb source for protecting relaying labs and self-learners, its handbook offers lab experiments unavailable somewhere else. The publication is appropriate for complex classes in electronic Relays and gear structures Fault research and security, and may turn out to be a invaluable source for practitioners within the software undefined, together with relay designers.
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Extra resources for Design, Modeling and Evaluation of Protective Relays for Power Systems
20 Three-phase model of the system If the option indicated in the left side of Fig. 19 is selected, the three-phase system is connected to a SLG fault. This is shown in Fig. 20. The symmetrical voltages at the fault location (V1, V2 and V0) are supplied to a simple 012 ! ABC converter and displayed for comparison with the voltages in the original threephase model. Also, the fault currents from the original system and from the symmetrical networks are displayed. This selection is shown in Fig. 21.
3. To see the contents of each of the options, position the mouse pointer on the desired box and double click. The option on the left hand side contains a three-phase network with unbalanced source as shown in Fig. 4. The block labeled “Measuring block” measures the phase currents and voltages in the time domain (output ports labeled i and v, respectively) and also their corresponding phasors (output ports Iabc and Vabc). , I þ a , I a , and Ia ) are obtained from phasors Ia, Ib and Ic. A figure with the mentioned phasors is shown at the end of the simulation, if the parameter “Block active” in its dialog box is checked (see Fig.
The equivalent circuits for positive and negative sequences are directly taken from , and they can be seen in Fig. 40. It should be noted that, the system shown in Fig. 39 contains a three-phase balanced source. Thus, the negative sequence equivalent circuit does not contain any voltage source. However, in the case of unbalanced situations, the negative sequence equivalent circuit has also a nonzero voltage source. In the representation of these equivalent circuits in Simulink, the shunt resistances (iron losses) are neglected.