Example23/ Two transformers (4) are designed to match a line having a Z. 3002, ZR : 750 find Stable impedance at the section.
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- Consider an ideal transformer with N1=3000andN2=1000 turns. Let winding 1 be connected to a source whose voltage is e1(t)=100(1| t |)volts for 1t1ande1(t)=0 for | t |1 second. A2- farad capacitor is connected across winding 2. Sketch e1(t),e2(t),i1(t),andi2(t) versus time t.An ideal transformer has no real or reactive power loss. (a) True (b) FalseQ5/B: Explain delta-star connection of 3 ph transformers. What its advantages and disadvantages?
- 6.5% ans ex A so kvA. 2o00/20 V, So He single-phase transformar has impedance drof of8% and resistance drop of 4%. Caleulate. The Requlation of the Thams former at full- Load o8 P.s Legging. also find The Power factor at which Voltage requlation will Be Zero. Sols 0.5 leading. s alculate The % Noltege Requlation af atransformar in w hich the Percantage resistance drof is 1% and Percentage dre is 6% when The Power fador is 0.8 lagging ) > unity aMS 38 % ans 1 % (シ→ 0.8 leading . amS - 2.2%What do the connection angles and groups show in transformers? For example, where are the Yy0 , Dy5 ,Yd5, Yz5 group transformers used?Describe the star-delta connection configuration types in three phase transformers and their necessity by drawing and writing. Thank you very much if you answer.
- D = 0.9 1.5° and B = 150 65° has at the load end a The load voltage and current are V₁ and I₁ A' B' VL B][Y and evaluate these constants. C' D' IL A long line with A transformer having series impedance Zr Obtain expression for Vs and Is in the form 10067°. [$]-[ =A transformer is needed that will cause an appear as 240 Vyms. actual load resista nce of 252 to 100R to an ac voltage source of ca) Dyews the diaggaam of the cuf. reguired. cb) what tuons ratio is required for the tounsforma. C) Find the currenttauen from the source the cuorent flowing through the load, and the load voltope load voltage-Two transformersA and B are connected in parallel to a load of (2+j1.5) ohm.Their impedances in Secondary terms ZA = (0.15+j0.8) ohm and Zb = (0.1+j30.6)ohm Their no-load termind voltages are EA=200<0 V and EB=210<0 Volt.Find the power and Power factor of each transformer? %3D %3D
- In the system shown in Figure 1, the transformers are connected star-star with both star points grounded and the generators are connected in star with thier star points grounded. The system base is 15 MVA. The transformers all have reactances of 0.04 p.u. on this 15 MVA base. The reactances of all other elements are given in Table 1 (in 2) and the voltage levels are given in Table 2. p.u. G1 p.u. T1 jö Per-Unit Convert all values to p.u. on a 15 MVA base. Xa= p.u. Xc₂= XL = V BABE G1 2 X 9 T3 Figure 1: A section of the distribution system T1 L Table 1: Sequence reactances (2) 3 G1 L G2 0.3 0.59 0.01 4 L 9/10 10 Fault Voltage What is the voltage at bus 3 (in Volts) after the fault has occurred? Vp= V T2 5 T2 34 10/4 Table 2: Voltage bases (kV) G2 4 T3 10/9 | G2 Fault Current A three-phase fault with a fault reactance of 0.01 p.u. occurs at bus 3. Calculate the fault current flowing at the fault point in KA. Ip=-j KA SoA 100 KVA, 500 V/200 V, 1-0 transformer when excited at rated voltage on h.v. side, draws a no- load current of 3.0 A at 0.8 lagging power factor. If it is excited from the l.v. side at rated voltage, the no load current and power factor will be respectively,Two 7970-V:230-V single-phase transformers with impedance with respect to their secondaries of 1.5 + j3 and 2 + j4.5 ohms are connected in parallel to a 7900-V source. Their secondaries are supplying a common load of 30 + j40 ohms. What is the magnitude of the voltage across the load in volts? (2 decimal places)