Consider the system as shown in figure Q3, supplies 100 kW at a power factor of 0.85 lagging. The real and reactive losses of the transmission-line feeder is 1.5 kW and 1.5 kvar, respectively. Find the load voltage and the real and reactive power absorbed by the load. ww- 240 20 V rms VL Load Figure Q3.
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- The instantaneous voltage across a circuit element is v(t)=400sin(t+30)volts, and the instantaneous current entering the positive terminal of the circuit element is i(t)=100cos(t+10)A. For both the current and voltage, determine (a) the maximum value, (b) the rms value, and (C) the phasor expression, using cos(t) as the reference.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%For the maximum average power transfer in the circuit shown in Figure 2, use the impedance ZLand ZLFind the value of the maximum average power transferred to ? (Can you write the steps in detail in sentences?)
- What is the main direct cause of reactive power in AC system?A. Resistance of transmission linesB. Inductance and capacitance in the loadsC. Ideal transformer connected in the systemD. Power produced by generatorCalculate the rms values of load voltage and current for the circuit shown below. Please show workA 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,
- Explain the concept of FACTS (Flexible Alternating Current Transmission Systems) devices. How do they enhance the control and stability of power systems? Provide examples of FACTS devices and their applications.Q4/For the three-phase power network shown in Figure. the various components are: GI: 100 MVA, 0.30 pu reactance. G2: 60 MVA, 0.18 pu reactance. Transformers (cach): 50 MVA, 0.10 pu reactance. Inductive reactor X: 0.20 pu on a base of 100 MVA. Lines (each): 80 ohms (reactive); neglect resistance. with the network initially unloaded and a line voltage of 110 kV, a symmetrical short circuit occurs at midpoint E of line 2. Calculate the short circuit MVA to be interrupted by the circuit breakers A and B at the ends of the line. T3 38 L1 L2 G2 Bas 12 T4 BusTwo impedances Z₁ and Z2 are connected in series to a voltage source with voltage Vs volts. Let V₁ be the voltage across Z₁ and V₂ be the voltage across Z2. Then, the total voltage Vs is divided between V₁ and V2 in proportion to impedance values Z₁ and Z2. O a. True O b. False
- For the maximum average power transfer in the circuit shown in Figure 2, use the impedance ??.and ??Find the value of the maximum average power transferred to ? (Can you write the steps in detail in sentences?)Q.3 (a) The short circuit MVA at the terminal of generating Station A and B are 1100 MVA and 1200 MVA respectively. The generated voltage at each station is 33 kV. If these stations are interconnected through a line having a reactance of 1.5 2 and negligible resistance, calculate the possible short-circuit MVA at both station. Choose 100 MVA as base. (b) A power system is represented by one line diagram in Figure Q.3(b). Each bus is rated at line voltage of 66 kV. The reactance of each component is given in per unit, based 100 MVA and rated voltage of the component. Assume that the prefault voltage of each generator is to be 1.0 per unit. Bus impedance matrix with all elements in per unit for the system is given below: j0.138 j0.112 j0.130 j0.138 j0.121 Zj0.112 jo.130 j0.121 j0.160 A solid three phase fault occurs at bus 1. Determine: (i) Fault current (in Ampere) and fault level (in MVA) at Bus 1. (ii) Transmission lines current (in Ampere) during fault. If line L23 is connected in…The total power drawn by the two-impedance load in parallel is 26kW at 0.98 power factor lagging, it is being supplied by a 230-volts AC source. One of the loads (Load 1) takes 16kVA at 0.77 power factor lagging. What is the reactive power of the unknown impedance (Load 2)?