In The System Shown In Figure 1 The Transformers Are Connected Star Star With Both Star Points Grounded And The Generat 1 (74.02 KiB) Viewed 43 times
In the system shown in Figure 1, the transformers are connected star-star with both star points grounded and the generator is connected in star with its star points grounded. The per unit impedances of each element on a 100 MVA base are given in Table 1 and the voltage levels are given in Table 2. 2 3 4 G T1 joi:1 L T2 IL Figure 1: A section of the distribution system Generator Transformer T1 Line Transformer T2 z [p.u.) 0.04 + j 0.07 0.02 +j 0.13 0.03 +j 0.09 0.03 + 0.09 Table 1: Sequence reactances (p.u. on 100 MVA base) Generator Line Load V BASE [kv] 4 25 6 Table 2: Voltage bases (kV)
Load Current A load current of 6.832 kA is flowing with a lagging power factor of 92 %. Convert this to a current vector in per-unit. IL = Z p.u. Voltages What are the voltages on bus (in p.u.)? Via 2 p.u. V2 = 2 p.u. V3 = Z p.u. VA= p.u. Efficiency Calcuate the load power out in MW. POUT = MW Calcuate the input power to the generator in MW. PIN MW Calculate the overall efficiency of the sytem. n- %
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