3. For a 1.2 accuracy class potential transformer used at a lagging phase angle y of 10', the RCF value is A. 0.991. B. 0.988. C. 0.977. D. 0.999.primary connection scheme that must be used with Grep 3 potential

An ideal transformer circuit is shown in Figure Q4(a). Its primary and secondary turns are 400 and 200 respectively. (1) Calculate the rms primary current. (ii) Calculate the rms flux in the transformer core. (iii) State two losses that contribute to transformer active power loss that have been ignored in this ideal model. N, Ny 30 + j30 2 300 sin50t Figure Q4(a) 00000000

A 150 kVA, 2500/250 V, 50 Hz, single phase transformer has a no-load current of 0.75 A and a core loss of 850 W, when the high voltage side is energized at rated voltage and a frequency. Determine the following : 1) The core loss component of no-load current 2) The magnetizing component of the no-load current 3)The core loss resistance on the high voltage side in ohm 4)The magnetizing resistance on the high voltage side in ohm

Q3) The equivalent parameters of a transformer referred to the secondary-side are Reqs 20 and Xeqs 10 2. The load voltage is 6010° V, calculate the load impedance given that the source voltage referred to secondary side is 100/0° V.

In no load phasor diagram of practical transformer, the magnetizing current Imag is ____________________ with primary voltage Vp. 90degreeout of phase Leading by 60degree In phase Lagging by 60degree

A transformer has 600 primary turns and 300secondary turns. The primary and secondary resistances are 0.35  and 0.09  respectively and the corresponding leakage reactances are 1  and 0.08  respectively. Determine  (a) the equivalent resistance referred to the Secondary winding,  (b) the equivalent reactance referred to the Secondary winding,  (c) the equivalent impedance referred to the secondary winding, and  (d) the phase angle of the impedance.

A voltage multiplier has 12 stages Capacitances, all equal to 0.08 μF. Thesupply transformer secondary voltage is 150 kV at a frequency of 100 Hz. Load current 0,006A.What is the percentage ripple, the regulation and the optimum number of stages for minimumregulation or voltage drop.

A 2000/400 V, 100 kVA, 60 Hz step-down single-phase transformer has a primary and secondary resistances of 0.2ohm and 0.05 ohm respectively, the corresponding leakage reactances being 0.3 ohm and 0.01 ohm respectively.1. Calculate the equivalent resistance, reactance and impedance referred to the low-voltage (secondary) side.2. Find the high (primary) voltage when the transformer is supplying full-load current at rated secondary voltage at 0.8 powerfactor lagging.3. Draw the phasor diagram showing your answer in 2.

Determine the regulation of a transformer in which thepercentage resistance drop is 1% and the percentagereactance drop is 5% when the power factor 0.8 leading.

Two transformers A and B are connected in parallel to a load of (2+j1.5) ohms. Their impedances in secondary terms are ZA= (0.15+j0.5) ohm and ZB = (0.1+j0.6) ohm. Their no-load terminal voltages are Ex=207 volt and EB-205 volt. Find the power output and power factor of each transformer.