Electrical Power Systems Technology

170 Electrical Power Systems Technology is an alternating current. However, it is possible to convert the alternat- ing current ...

Direct Current Power Systems 171 Figure 7-9. Simplified drawing of the basic parts of a DC generator Figure 7-10. Output wavefor ...

172 Electrical Power Systems Technology Solution: since each turn has 2 conductors, and 36 slots are used in the armature core, ...

Direct Current Power Systems 173 the field coils. The output voltage of generators that use electromagnetic fields can be contro ...

174 Electrical Power Systems Technology Self-excited Series-wound DC Generators—Since DC generators pro- duce direct current, it ...

Direct Current Power Systems 175 If the load circuit is disconnected, no current flows through the gen- erator. However, the fie ...

176 Electrical Power Systems Technology that require stable load current as the voltage changes. However, the self- excited seri ...

Direct Current Power Systems 177 will increase the I × R drop in the armature, resulting in a smaller output voltage. Further in ...

178 Electrical Power Systems Technology varies. A large load causes the armature current to decrease. This decrease is desirable ...

Direct Current Power Systems 179 Figure 7-17. Simplified illustration of a compound-wound DC generator,: (A) Pictorial diagram, ...

180 Electrical Power Systems Technology variations in load current. The compound-wound DC generator is used more extensively tha ...

Direct Current Power Systems 181 power systems for large earth-moving equipment, and DC motor-drive units for precise equipment ...

182 Electrical Power Systems Technology Single-phase Rectification Systems The simplest system for converting AC to DC is single ...

Direct Current Power Systems 183 device. The peak inverse voltage (piv) is the maximum voltage across the diode while it is reve ...

184 Electrical Power Systems Technology voltage during each alternation of the AC input. The rectified output of the full-wave r ...

Direct Current Power Systems 185 Single-phase Bridge Rectification One disadvantage of the full-wave rectifier discussed previou ...

186 Electrical Power Systems Technology occurs, as shown in Figure 7-22A, diodes D1 and D3 are forward biased, while diodes D2 a ...

Direct Current Power Systems 187 Figure 7-22. Single-phase full-wave bridge rectification: (A) Diodes D1 an D3 and forward biase ...

188 Electrical Power Systems Technology put, as shown in Figure 7-23B. Of course, the voltages appearing across the diodes are 1 ...

Direct Current Power Systems 189 120° apart. Since the DC output voltage never falls to zero, less AC ripple is present, which r ...