Is = 10 Arms Determine the instantaneous energy stored in the transformer wirings at t=0. The frequency of the current Is is 1000 rad/s. IS ww 6 Ω j5Q j100 j140 10 Ω
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- 59. A 50-kVA distribution transformer has a full load copper loss of 1 kW and an iron loss of 1 kW. The transformer is loaded as follows: full load at unity pf for 8 hours, one-half load at unity for 6 hours and no-load the rest of the day. Calculate the energy efficiency of the transformer. a. 94.25 % b. 92.34 % c. 95.43 % d. 93.67 %Foucault loss is determined as 1W when 60 Hz sinusoidal voltage is applied to a transformer. If only the frequency is increased to 120Hz, provided that the flux density remains the same, how many Watts will the new value of this loss be? a) 3 b) square root 2 c) 1 d) 4 e)120/60A single-phase transformer used for street lighting(high-pressure sodium discharge lamps) converts 6 kVto 230 V (to load) with an efficiency of 0.95. Assumingpf = 0.8 and the primary apparent power is 30 kVA,finda. The secondary current.b. The transformer’s ratio.
- A 150 kVA, 2400/240 V, 50 Hz transformer has the following parameters:R₁ = 0.21622R₂=2.1 m2X₁ = 0.463 2X₂=4.54 m2Exciting admittance on 240 V side (subscript 2) is y, = 0.0101-j0.069 S.a) Draw the equivalent circuit showing all components.A 100kva, 2400/240V, 60Hz transformer has the following data: R1=0.46Ω, X1=0.76,R2=0.0038Ω and X2=0.0068Ω. (a) determine the equivalent resistance referred to the primary in ohms, (b) determine the equivalent reactance referred to the primary in ohms,(c) determine the equivalent impedance referred to the primary in ohms Subject Electrical Apparatus and DevicesA 480V/240V, 60Hz single transformer has Z1 = 0.1+j0.22 ohms and Z2 = 0.035 + j0.12 ohm. Find the equivalent impedance in ohm referred to the secondary. Group of answer choices 0.07+j0.135 0.06+j0.175 0.04+j0.135 0.06+j0.135
- A 10kVA 2300/230V 60Hz, single phase transformer has Zp = 3.96 +15.8 ohms and Zs = 0.0396+j0.158 ohms. The transformer delivers 10KVA at 0.85 power factor lagging to a load at the secondary side. Determine the voltage across the load. Round off answer to two decimal placesWhat is the impedance of a transformer coil that has 340' of #18 copper wire and an inductance of 70mH at 60Hz? 1000’ of #18 copper wire is 16 ohms.1. A 500 kVA transformer is at full load and 0.60 lagging pf. A capacitor bank is added improving the power factor to 0.90 lagging. After improvement, what percent of rated kVA is the transformer carrying?
- A 80 MVA single-phase transformer supplies power to four customers at 0.8 p.f. How many units the transformer can supply per day?The figure shows an unreduced approximate L-type equivalent circuit to the High voltage (Primary) side of a 30 kVA, 4000V/120V, 60Hz transformer (Here, the parallel arms are shifted to the right, not to the left). In a transformer with parameters RH=1.6 Ohm, RL=1.44 milli Ohm, LH=21 milli Ohm, LL=19 micro Henry, RcH=160 kilo Ohm and LmH=450 Henry;Calculate the phasor V1 on the high voltage side, since it is known that a load with pf=0.6 (lagging) characteristics is connected at VL=120V on the low voltage side, and it is known that P2=20kW power is consumed.A transformer supplies load of 360KW at 0.6 p.f lagging. Calculate The KVAr rating of the loss free static capacitors required to correctcthe p.f. to 0.95 ii. The KW input to a synchronous motor required to correct the p.f from 0.6 lagging to 0.95 lagging