and other methods of energy transport. These data on energy transport are combined with heat engine characteristics in Section 3.3.2 and the effects of varying the temperature rise through the collector is also considered. The total system performance is given in Section 4.2. 3.2.2 Electric Power Transport A discussion of the system aspects of the electric collection function occurred in Section 2.1.3 where electric power is generated at each dish-Brayton engine combination. The ac induction generator appears to be a prime candidate forusewith the Brayton heat engine. Underground aluminum cables were suggested as the appropriate method to collect electric power and deliver it to a central site for external transmission. The design of this subsystem, its capital costs and efficiency of energy transport are major points of interest. Based on a conventional, out-of-catalog induction type 25 HP motor, about 20 kVA of power can be generated. At the synchronous speed of 3600 rpm, the terminal voltage is 460 V, 3 phase, 60 Hz. The machine is a totally enclosed type, suitable for outdoor use where high reliability and long life are prime considerations. The cost is about 35$/kWe with a discount for quantity purchase. As shown at the top of Figure 13, the induction generator has a size 3 motor starter which is suitable for a 37 kWe machine. It is equipped with all required automatic features and reverse power trip coil and rated for outdoor service. The cost is about 33$/kWe based on a machine rated at 20 kWe. The entire power plant network is divided into a group of modules. Each module (Figure 13) is made up of 100 collector dish-Brayton engine sets in parallel and generates approximately 2MW. The module is connected to a transformer bank (T-j) to boost the voltage to 25 kV for collection from the field. This transformer is a primary substation type (oil-immersed) rated at 2.3 MW and has an efficiency of 98.5% at full load. Its cost is about 10$/kWe. Eight modules
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