![]() ![]() The fact that the neutral wire is carrying 83. The direction of rotation of polyphase induction and synchronous motors depends on the phase sequence of the applied voltages. However, we have realized a gain in safety, because the overall voltage between the two “hot” conductors is 32 volts lower than it was in the split-phase system (208 volts instead of 240 volts). With the same amount of current through each “hot” wire, we must use the same gauge copper conductors, so we haven’t reduced system cost over the split-phase 120/240 system. Three-phase systems are the polyphase systems most commonly used in practical. Note that we are still conveying 20 kW of total power to the two loads, with each load’s “hot” wire carrying 83.33 amps as before. The principle circuit of a thermal wattmeter is shown in Figure 39.6(a). So, we find that the “neutral” wire is carrying a full 83.33 amps, just like each “hot” wire. Polyphase Wattmeter Pdf Download Wattmeters Polyphase 0 0 1.42 1.42 0 1.0 Wattmeters 5-ampere, 60-cycle Current Circuit AB-14, -15, Single- 0.063 0.019 0-00016 1.58 0.48 1.51 0. The stator produced flux rotates in synchronous speed with respect to stator. Tells us that the currents entering and exiting the node between the two loads must be zero: (Figure ) Neutral wire carries a current in the case of a pair of 120 o phased sources. In polyphase induction machine both the stator and rotor winding carry alternating currents. If we calculate the current through the “neutral” conductor, we find that it is not zero, even with balanced load resistances. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |