D6. You are given a report that shows 2 different designs of a quadruple stage impulse generator(specifications are listed in Table Q2) to perform a lightning impulse withstand voltage test ona transformer. Evaluate the oulput of hoth design huse on IEC 60060-1 2010 standard testsequircanent.Table Q2: Technical specificationsDesign AItemsDesign BMaximum ImpulseVoltageChargingCapacitance(single stage)Voltage EficiencyLoad Capacitance100 kV90 kV25.5 nF60 nFS0%60%1.2 nF80 times lower thancharging capacitance(single stage)Damping225 2425 0ResistanceDischarge5874 25871 2Resistance

Design "A" is more suitable for creating impulsive voltage waveforms than Design "B."

You are given a report that shows 2 different designs of a quadruple stage impulse generator (spocifications are listod in Table Q2) to perform a lightning impulse withstand voltage test on a tramsformer. Evaluate the output of both design hase on IEC 60060-1 2010 standard test sequircment. Table Q2: Technical specifications Design A Items Design B Maximum Impulse Voltage Charging 100 kV 90 kV 25.5 aF 60 aF Capacitance (single stage) Voliage Efficiency Load Capacitance 60% 12 nf 80 times lower than charging capacitance (single stage) Damping Resistance Discharge Resistance 225 2 425 2 5874 2 5874 2

You are given a report that shows 2 different designs of a quadruple stage impulse generator (spocifications are listod in Table Q2) to perform a lightning impulse withstand voltage test on a tramsformer. Evaluate the output of both design hase on IEC 60060-1 2010 standard test sequircment. Table Q2: Technical specifications Design A Items Design B Maximum Impulse Voltage Charging 100 kV 90 kV 25.5 aF 60 aF Capacitance (single stage) Voliage Efficiency Load Capacitance 60% 12 nf 80 times lower than charging capacitance (single stage) Damping Resistance Discharge Resistance 225 2 425 2 5874 2 5874 2

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.28MCQ

See similar textbooks

Similar questions

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.
For the transformer in Problem 3.10. The open-circuit test with 11.5 kV applied results in a power input of 65 kW and a current of 30 A. Compute the values for GcandBm in siemens referred to the high-voltage winding. Compute the efficiency of the transformer for a load of 10 MW at 0.8 p.f. lagging at rated voltage.
A single-phase, 50-kVA,2400/240-V,60-Hz distribution transformer has the following parameters: Resistance of the 2400-V winding: R1=0.75 Resistance of the 240-V winding: R2=0.0075 Leakage reactance of the 2400-V winding: X1=1.0 Leakage reactance of the 240-V winding: X2=0.01 Exciting admittance on the 240-V side =0.003j0.02S (a) Draw the equivalent circuit referred to the high-voltage side of the transformer. (b) Draw the equivalent circuit referred to the low-voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits.
An industrial plant consisting primarily of induction motor loads absorbs 500 kW at 0.6 power factor lagging. (a) Compute the required kVA rating of a shunt capacitor to improve the power factor to 0.9 lagging. (b) Calculate the resulting power factor if a synchronous motor rated at 500 hp with 90 efficiency operating at rated load and at unity power factor is added to the plant instead of the capacitor. Assume constant voltage (1hp=0.746kW).
3) The results of an open circuit test and a short circuit test In a 450 kVA transformer, 42000/2400 V, 60 Hz are the following: Open circuit test (low voltage side) VCA = 2400 V ICA = 18,1 A PCA = 3785 in Short circuit test (High voltage side) Vcc = 1910 V Icc = 11,9 A PCC3850 W a) Find the equivalent circuit of the transformer referred to the bass side voltage. b) Calculate the efficiency of the transformer at full load with a factor of Power of 0.85 in delay.
A 72VA, 60Hz single-phase transformer has the equivalent circuit shown. (a) What is the no-load current if excited on the 120V side?(b) Estimate the losses in the transformer at full load with power factor 1.0.(c) Estimate the input voltage required for full load if the output voltage is 36V-rms and the output currentlags the voltage by 25 degrees.(d) What is the voltage regulation?Ans:(b) 4.68W (c)V_p = 123 angle(0.65) V rms (d) 2.5% Show me how each answer was found
Question 1. a) What is the need of compensation in power system? b) Give the schematic diagram showing a shunt compensator on a distribution transformer. c) Give the desirable characteristic features f a shunt compensator. d) List different methods used in shunt compensator. e) Name two power factor correction method. f) Define Facts and name 2 series connected facts devices g Draw a circuit diagram of a Static Synchronous Series Compensator (SSSC) and gives his applications.
A two-winding, step-down transformer has a turns-ratio (N2/N1) of 0.5. The primary winding resistance and reactance are 2.5Ω and 6Ω, whereas the secondary winding resistance and reactance are 0.25Ω and 1Ω, respectively. Its magnetizing current and core-loss current are 51.5 mA and 20.6 mA. While in operation, the output voltage for a load of 25 /_ 300 is found to be 50 V. Determine the supply voltage, the current drawn from the supply and the power factor. ...
The diagram shown below is a typical tuning circuit. Considering this circuit comprises a transformer (with a coil ratio of 20:1 and an HV side voltage of 240V ), a capacitor of impedance -j20Ω, an inductor of impedance j40Ω, and a 50Ω resistor, determine: the current supplied by the source (0.2228) the impedance seen at the supply (HV side)(21540.55) the power dissipated by the resistor(2.482 watts) the operating power factor of the fitting(0.928 lagging) If the capacitor is now removed from the above circuit and is placed in parallel with the secondary of the transformer, redraw the circuit diagram and recalculate parts a. to d. in question (i). Draw the phasor diagram for both series and parallel RLC circuits in parts (i) and (ii). Discuss the effects of changing the capacitor connection in parallel on the power factor of the circuit. State the benefits of using the transformer in the above circuit. Explain the operating principle of the transformer with particular reference to…
Q/ A 20 KUA , 200/500 voit single phase step-up transformer hes: primary resistance: 0.022 ; secondary resistance = 0.0482; magnetizing branch with Ro - 1001 and Xo = 750.52. Findi magnetizing Current ? The efficiency at rated current unity ef: wa efteciemy at hall rated current with Pt 0.7 leading? The effecieing at 0:8 Vated current Zerol.f._; Maxoff At vnity PF ?
A Cockcroft-Walton type voltage multiplier has ten stages with capacitances, all equal to 0.1 μF. The supply transformer secondary voltage is 100 kV at a frequency of 60 Hz. If the load current to be supplied is 5 mA, find (a) the percentage ripple, (b) the regulation, and (c) the optimum number of stages for minimum regulation or voltage drop.
Determine the amount of power, in watts, consumed by the transformer shown. Assume that the voltage source is ideal (Rs=50 mΩ), R1=5 Ω, and L1=250 mH. The frequency of the 120 V(rms) source is 60 Hz.