9781439856222 Figure 3.22 shows the pole configuration of conductors for a three
ID: 2079769 • Letter: 9
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9781439856222 Figure 3.22 shows the pole configuration of conductors for a three-phase primary feeder. Te conductors are 250,000 cm, CON Lay, all aluminum (AA). The nominal line-to-line voltage of the feeder is 14.4 kV Determine the series impedance per mile of this line Determine the K_drop factor assuming a power factor of 0.88 lag Determine the k_rise factor. A 4.16 three-phase primary feeder is shown in Figure 3 23 The K_drop = 0.00298639% drop/kVA-mile The K_rise = 0.00334353% rise/kvar-mile Determine the percent voltage drop to node E4. b. Determine the rating of a three-phase shunt capacitor bank to be placed at E3 to limit the voltage drop to E4 to 5.0%.Explanation / Answer
3.1)To derive the rephasing strategy of distribution transformers and laterals to improve three-phase balance of distribution feeders, the phase currents and neutral current of all primary trunk line sections, laterals and transformers have been simulated by three-phase load flow analysis according to the feeder phase currents and neutral current collected by SCADA system. The attributes of distribution components such as line segments, distribution transformers, etc.,of each distribution transformer is then obtained by integrating the power profiles of all customers served. The three-phase currents and neutral current of each primary trunk line section and each lateral are therefore derived by considering the mutual effect between phase conductors in the three-phase load flow analysis. The objective function for rephasing strategy of distribution transformers and laterals is then formulated by including the number of customers affected, the total load demand interruption and the time duration to complete the rephasing works by distribution engineers.The overall process to derive the optimal rephasing strategy to enhance the three-phase balance of distribution feeders.
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