**4.2 Simulation results**

As shown in **Figure 9**, the simulation design uses 200 MVA /11 kV, with a synchronous generator connected to a transmission line 25 kV through an 11/25 transformer, 60 Hz, Load10 MW, and 3 Mvar. Relays are tested in a variety of situations. The conditions and results of the discussion are as follows.

**Figure 9.**

*Model of a reverse power relay in an electrical power system.*

**213**

Power (pu).

**Table A1** [1].

**Figure 11.**

*4.2.1 Simulation results under the normal condition*

*(a) Performance of the input-output power; and (b) relay status.*

shown in **Figure 10**, and the relay does not trip.

*4.2.2 Simulation results under the faulty condition*

*New High-Speed Directional Relay Based on Wireless Sensor Network for Smart Grid Protection*

The structure of propose protection is shown in **Figure 4**. The nodes of in\_1 and in\_2 represent the input variables and pass their values to the blocks that contain the respective membership functions in Neuro-Fuzzy controller. The relays are tested under a variety of conditions. We have provided the details of the system in

In this case, the mechanical power input of the generator within 1–2 seconds differs from 0.6 to 0.7 pu, at the under normal circumstances the observed state is

In this case, the mechanical power input in 2–3 seconds from 0.7 to −0.1 pu. Relay responds to this change after 0.15 second for safe, and the relay is triggered, where the fault occurred at 2 seconds as shown in **Figure 11**. Input Mechanical

The reverse current adjustment knob and the delay time are shown in **Table A2** of the Appendix, and then the trip is confirmed with the minimum reverse current

in the range of 2–20%. The trip time delay setting range is 0–20 seconds.

*DOI: http://dx.doi.org/10.5772/intechopen.85891*

**Figure 10.** *(a) Performance of input-output power; and (b) relay status.*

*New High-Speed Directional Relay Based on Wireless Sensor Network for Smart Grid Protection DOI: http://dx.doi.org/10.5772/intechopen.85891*

**Figure 11.** *(a) Performance of the input-output power; and (b) relay status.*

The structure of propose protection is shown in **Figure 4**. The nodes of in\_1 and in\_2 represent the input variables and pass their values to the blocks that contain the respective membership functions in Neuro-Fuzzy controller. The relays are tested under a variety of conditions. We have provided the details of the system in **Table A1** [1].
