Parameter for Open Circuit TestValueAC Source415 VmsNominal power and frequency [Pa(VA) fn(Hz)]:Transformer Winding 1 [V1(Vms) R1(Ohm) L1(H)]:Transformer Winding 2 [V2(Vms) R2(Ohm) L>(H)]:Magnetization resistance and Inductance [R„(Ohm) Lm(H)]:[10°VA, 50 Hz][20000 V, 0.01 Q, 0.001 Q][50000 V,0.01 Ω,0.001 Ω][718 Q, 0.5 H]Parameter for Short Circuit TestValueAC Source1000 VmsNominal power and frequency [[Pa(VA) fa(Hz)]:Transformer Winding 1 [V1(Vrms) R1(Ohm) Li(H)]:Transformer Winding 2 [V2(Vms) R2(Ohm) L2(H)]:Magnetization resistance and Inductance [Rm(Ohm) Lm(H)]:[10°VA, 50 Hz]120000 V,0.01 Ω,0.001 Ω[50000 V, 0.01 Q, 0.001 Q][718 2, 0.5 H]Calculate the parameter of transformer by referring to the primary side.|

We are given a transformer with following specifications: Transformer winding 1 voltage: V1RMS=20000…

Parameter for Open Circuit Test Value 415 Vrms (10°VA, 50 Hz] 120000 V,0.01 Ω,0.001 Ω [50000 V, 0.01 , 0.001 Q] [718 Q, 0.5 H] AC Source Nominal power and frequency [P«(VA) fa(Hz)]: Transformer Winding 1 [V1(Vms) R1(Ohm) L,(H)]: Transformer Winding 2 [V2(Vms) R2(Ohm) L¿(H)]: Magnetization resistance and Inductance [R„(Ohm) Lm(H)]: Parameter for Short Circuit Test Value AC Source 1000 Vn ms Nominal power and frequency [[Pa(VA) fa(Hz)]: Transformer Winding 1 [V1(Vms) R1(Ohm) Li(H)]: Transformer Winding 2 [V2(Vms) R2(Ohm) L>(H)]: Magnetization resistance and Inductance [Rm(Ohm) Lm(H)]: [10°VA, 50 Hz] [20000 V,0.01 Ω,0.001 Ω] [50000 V,0.01 Ω,0.001)] [718 Q, 0.5 H] Calculate the parameter of transformer by referring to the primary side.

Parameter for Open Circuit Test Value 415 Vrms (10°VA, 50 Hz] 120000 V,0.01 Ω,0.001 Ω [50000 V, 0.01 , 0.001 Q] [718 Q, 0.5 H] AC Source Nominal power and frequency [P«(VA) fa(Hz)]: Transformer Winding 1 [V1(Vms) R1(Ohm) L,(H)]: Transformer Winding 2 [V2(Vms) R2(Ohm) L¿(H)]: Magnetization resistance and Inductance [R„(Ohm) Lm(H)]: Parameter for Short Circuit Test Value AC Source 1000 Vn ms Nominal power and frequency [[Pa(VA) fa(Hz)]: Transformer Winding 1 [V1(Vms) R1(Ohm) Li(H)]: Transformer Winding 2 [V2(Vms) R2(Ohm) L>(H)]: Magnetization resistance and Inductance [Rm(Ohm) Lm(H)]: [10°VA, 50 Hz] [20000 V,0.01 Ω,0.001 Ω] [50000 V,0.01 Ω,0.001)] [718 Q, 0.5 H] Calculate the parameter of transformer by referring to the primary side.

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 3.47P: Consider the oneline diagram shown in Figure 3.40. The three-phase transformer bank is made up of...

See similar textbooks

Similar questions

Three single-phase, two-winding transformers, each rated 450MVA,20kV/288.7kV, with leakage reactance Xeq=0.10perunit, are connected to form a three-phase bank. The high-voltage windings are connected in Y with a solidly grounded neutral. Draw the per-unit equivalent circuit if the low-voltage windings are connected (a) in with American standard phase shift or (b) in Y with an open neutral. Use the transformer ratings as base quantities. Winding resistances and exciting current are neglected.
The direct electrical connection of the windings allows transient over voltages to pass through the auto transfonner more easily, and that is an important disadvantage of the autotransformer. (a) True (b) False
Consider the oneline diagram shown in Figure 3.40. The three-phase transformer bank is made up of three identical single-phase transformers, each specified by X1=0.24 (on the low-voltage side), negligible resistance and magnetizing current, and turns ratio =N2/N1=10. The transformer bank is delivering 100 MW at 0.8 p.f. lagging to a substation bus whose voltage is 230 kV. (a) Determine the primary current magnitude, primary voltage (line-to-line) magnitude, and the three-phase complex power supplied by the generator. Choose the line-to-neutral voltage at the bus, Va as the reference Account for the phase shift, and assume positive-sequence operation. (b) Find the phase shift between the primary and secondary voltages.
Consider Figure 3.4. For an ideal phase-shifting transformer, the imda nce is unchanged when it is referred from one side to the other. (a) True (b) False
For developing per-unit equivalent circuits of single-phase three-winding transformer, a common Sbase is selected for all three windings and voltage bases are selected in proportion to the rated voltage of the windings (a) True (b) False
A single-phase 50-kVA,2400/240-volt,60-Hz distribution transformer is used as a step-down transformer at the load end of a 2400-volt feeder whose series impedance is (1.0+j2.0) ohm. The equivalent series impedance of the transformer is (1.0+j2.5) ohms referred to the high-voltage (primary) side. The transformer is delivering rated load at a 0.8 power factor lagging and at a rated secondary voltage. Neglecting the transformer exciting current, determine (a) the voltage at the transformer primary terminals, (b) the voltage at the sending end of the feeder, and (c) the real and reactive power delivered to the sending end of the feeder.
A bank of three single-phase transformers, each rated 30MVA,38.1/3.81kV, are connected in Y- with a balanced load of three 1, Y-connected resistors. Choosing a base of 90MVA,66kV for the high-voltage side of the three-phase transformer. spify the base for the low-voltage side. Compute the per-unit resistance of the load on the base for the low-voltage side. Also, determine the load resistance in ohms referred to the high-voltage side and the per-unit value on the chosen base.
A single-phase two-winding transformer rated 90MVA,80/120kV is to be connected as an autotransformer rated 80/200kV. Assume that the transformer is ideal. (a) Draw a schematic diagram of the ideal transformer connected as an autotransformer. showing the voltages, currents, and dot notation for polarity. (b) Determine the permissible kVA rating of the autotransformer if the winding currents and voltages are not to exceed the rated values as a two-winding transformer. How much of the kA rating is transferred by magnetic induction?
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 ideal transformer has no real or reactive power loss. (a) True (b) False
Three single-phase two-winding transformers, each rated 25MVA,54.2/5.42kV, are connected to form a three-phase Y- bank with a balanced Y-connected resistive load of 0.6 per phase on the low-voltage side. By choosing a base of 75 MVA (three phase) and 94 kV (line-to-line) for the high-voltage side of the transformer bank, specify the base quantities for the low-voltage side. Determine the per-unit resistance of the load on the base for the low-voltage side. Then determine the load resistance RL in ohms referred to the high-voltage side and the per-unit value of this load resistance on the chosen base.
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.