Electrical Power Systems Technology

290 Electrical Power Systems Technology UNIT OBJECTIVES Upon completion of this unit, you should be able to: Define the term “e ...

Unit Objectivees 291 Coefficient of Utilization (CU) Room Ratio Depreciation Factor (DF) Calculate light output of a lighting s ...

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293 Chapter 11 Fundamentals of Electrical Loads The electrical load devices that are used in industry, in our homes, and in comm ...

294 Electrical Power Systems Technology Synchronous Capacitor Balanced Three-phase Load Unbalanced Three-phase Load Line Voltage ...

Electrical Power Conversion Systems 295 Sample Problem: Given: a factory has a peak demand of 12 MW and an average power demand ...

296 Electrical Power Systems Technology trial plants, power demand control systems and procedures can help in- crease the effici ...

Electrical Power Conversion Systems 297 by a load. The smallest reactive power shown (VAR 1 ) results in the volt- ampere value ...

298 Electrical Power Systems Technology Figure 11-3. Illustration of the effect of capacitive reactance on an inductive cir- cui ...

Electrical Power Conversion Systems 299 the transformer windings, and the power lines. To counteract the induc- tive effects, ut ...

300 Electrical Power Systems Technology Table 11-1. Kilowatt (kW) Multipliers for Determining Capacitor Kilovars (kVAR) ...

Electrical Power Conversion Systems 301 ...

302 Electrical Power Systems Technology phase voltages (VP). The line currents (IL) are equal to the phase currents (IP) multipl ...

Electrical Power Conversion Systems 303 1000 watts = ————— 240 volts = 4.167 amperes The line current is calculated as: IL = IP ...

304 Electrical Power Systems Technology 20,000 watts = —————————— 480 volts × 1.73 × 0.75 = 32.11 amperes Then, for the power pe ...

Electrical Power Conversion Systems 305 power factor, and transpose. Thus, we have IP = PP/VP × pf. Substitution of the values f ...

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307 Chapter 12 Heating Systems Power conversion systems are commonly referred to by the func- tion they perform. Power conversio ...

308 Electrical Power Systems Technology BASIC HEATING LOADS Most loads that are connected to electrical power systems produce a ...

Heating Systems 309 is produced in magnetic materials when they are exposed to an alternat- ing current (AC) field. In the examp ...