Chapter 13, Problem 20P

2. Suppose G₁(s) = (s+2) G₂(s) = (s-3) C(s) Find the transfer function G(s): for each of the following three configurations R(s) shown in Figure 1. Note (a) is a cascaded (series) system, (b) is a parallel system, and (c) is a feedback (closed-loop) system. € (c) C(s) R(s) G₁(s) G2(5) G₁(s) R(s) C(s) G2(s) C(s) R(s) G₁(s) G₂(s) Figure 1

Determine the transformer's active power losses and primary voltage (Figure 1). The busbar's voltage at the transformer's secondary side is 20.5 kV. Load P is 6 MW, and the power factor is 0.95ind.

Select a short-circuit withstanding (1-second short circuit length) cable for Feeder 1 in Figure 1. Values for cables are given in Table 1. The voltage of the supplying network is now 115 kV and the short-circuit power of the supplying network is 2000 MVA. Table 1. Technical information of 3-phase cables (10 kV and 20 kV) Product's name EA-number Structural information 20KV 20KV 20 KV 0624250 0624252 0624253 0624254 AHKAMK-W AHKAMKW AHKAMKWAHKAMKW AHKAMKW AHKAMKW AHKAMKW 3x50Al+35Cu 3x95 Al. 35Cu 3x120Al. 35Cu 3x150Al+35Cu 3x185Al+35Cu 3x240A1+70 Cu 3x300Al+70Cu 20kV 20kV 20 kV (8) 20KV 0624255 0624257 0624256 Diameter of conductor Diameter of out-most circle Cable's outer diameter Mass Delivery information Standard length Delivery reel mm 8.0 11.3 12.7 14.1 15.7 18.1 20.3 mm 28 32 34 35 37 40 43 mm 64 71 74 76 80 89 94 aluminium kg/km 510 910 1100 1350 1650 2200 2700 сорраг kg/km 305 305 305 305 305 600 600 cable kg/km 2350 3100 3450 3800 4300 5500 6250 E 500 500 500 500 500 500 500…