3-phase 50-kVA 31,5/0,4-KVLL distribution transformers are connected in A-Y.Open-circuit test was performed on the high-voltage side of this transformer bank, and the following data wererecorded: Vline,oc=480 V, Iline,oc=4.10 A, Poc = 945 WShort-circuit test was performed on the low-voltage side of this transformer bank, and the following data wererecorded: Vline,sc = 808 V, Iline,sc = 3.11 A, Psc = 912 W(a) Find the voltage regulation of this transformer bank at the rated load and 0.85 power factor lag.(b) Draw a phasor diagram of this transformer at 0.85 power factor leading.A 20 Hp, 440-V, 0.85-PF-lagging Y-connected synchronous motor has an armature resistance of 0.22 2 and asynchronous reactance of 3.0 2. Its efficiency at full load is 92% (1 Hp=746 watt).(a) What is the input power to the motor at rated conditions?(b) What is the line current of the motor at rated conditions?(c) What is the internal generated voltage EA of this motor at rated conditions?A 3-phase Y-connected 380-V (line-to-neutral), 60-Hz 6-pole induction motor has the following parametervalues in 22/phase referred to the stator: R₁ = 0.294, R₂ = 0.144, X₁ = 0.503, X₂ = 0.209, Xm = 13.25. The totalfriction, windage, and core losses may be assumed to be constant at 403 W, independent of load. For a slip of5%,a. Output torqueb. Stator current,c. Power factor,d. Converted powere. Efficiency.

Voltage regulation in a three-phase transformer refers to the ability of the transformer to maintain…

3-phase 50-kVA 31,5/0,4-kV₁L distribution transformers are connected in A-Y. Open-circuit test was performed on the high-voltage side of this transformer bank, and the following data were recorded: Vline,oc=480 V, Iline,oc=4.10 A, Poc = 945 W Short-circuit test was performed on the low-voltage side of this transformer bank, and the following data were recorded: Vline,Sc = 808 V, Iline,Sc = 3.11 A, Psc = 912 W (a) Find the voltage regulation of this transformer bank at the rated load and 0.85 power factor lag.

3-phase 50-kVA 31,5/0,4-kV₁L distribution transformers are connected in A-Y. Open-circuit test was performed on the high-voltage side of this transformer bank, and the following data were recorded: Vline,oc=480 V, Iline,oc=4.10 A, Poc = 945 W Short-circuit test was performed on the low-voltage side of this transformer bank, and the following data were recorded: Vline,Sc = 808 V, Iline,Sc = 3.11 A, Psc = 912 W (a) Find the voltage regulation of this transformer bank at the rated load and 0.85 power factor lag.

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 3.10P: A single-phase step-down transformer is rated 13MVA,66kV/11.5kV. With the 11.5 kV winding...

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A single-phase step-down transformer is rated 13MVA,66kV/11.5kV. With the 11.5 kV winding short-circuited, rated current flows when the voltage applied to the primary is 5.5 kV. The power input is read as 100 kW. Determine Req1andXeq1 in ohms referred to the high-voltage winding.
In the circuit in Figure 2, the capacitor connected to the a-b terminals of the transformer anda circuit consisting of resistance is defined as a load circuit. a)Find the average power spent by the load circuit? b) How much of the average power calculated in a) by the resistance in the load circuit and how muchspent by the capacitor? Comment on the results obtained?
The equivalent circuit impedances of a 20-kVA, 8000/240-V, 60-Hz transformer are to be determined. The open-circuit test and the short- circuit test were performed on the primary side of the transformer, and the following data were taken: Open-circuit test (on primary) Short-circuit test (on primary) 8000 V V= 489 V I0.214 A 2.5 A P= 400 W P= 240 W Find the impedances of the approximate equivalent circuit referred to the primary side, and sketch the circuit.
What is the influence of transformer connections in single-phase transformers connected for 3- phase operation
In the circuit in Figure 2, the capacitor connected to the a-b terminals of the transformer anda circuit consisting of resistance is defined as a load circuit. Find the average power spent by the load circuit?
What are the conditions for the parallel operation of 1-phase transformers?
A voltage transformer in Figure 8 has 1,500 turns of wire on its primary winding and 500 turns of wire for its secondary winding. What will be the turns ratio, a of the transformer. If 240 volts is applied to the primary winding, what will be the resulting secondary voltage. And if a 400 n resistor is connected to the secondary winding, what are the values of current Is and Ip. primary Vp Transformer Core NF Ns Figure 8 secondary Vs
1.a. For performing dielectric-strength tests on insulating materials, two transformers are connected in aA. parallel combination.B. cascade arrangement.C. polyphase arrangement. 1.b. In large power transformers, the unequal voltage distribution caused by voltage surges in the winding isprevented by the use ofA. static shields.B. series capacitors.c. low-voltage arresters.
Example 2-2. The equivalent circuit impedances of a 20-kVA, 8000/240-V, 60-Hz transformer are to be determined. The open-circuit test and the short-circuit test were performed on the primary side of the transformer, and the following data were taken: Open-circuit test (on primary) Short-circuit test (on primary) Voc = 8000 V Vsc = 489 V loc = 0.214 A Isc = 2.5 A Voc = 400 W Ps = 240 W
A 100/S00 V. 1 KVA, 50 Hz transformer was put through open and short-circuit tests to find its internal parameters. The test conditions and derived parameters are as follows Open circut test: The high voltage side terminals were open. The low voltäge side was connected to 10020ª, 50 Hz supply. The low voltage side current was measured as 50245º MA. Short-circuit test The high voltage side terminals were short-circuited. The low voltage side was connected to a variable voltage supply (50 Hz). A full load current of 102-30° A was achieved when the variable voltage supply was at 820° V. The transformer was then put to operation by connecting a load of 400230° 2 to the high voltage side (secondary) while applying a primary voltage of 10020º V. Calculate the primary current (the current drawn from the power supply).
Answer only please The resistance of a transformer winding is 0.25 ohm at 25oC. When operating at full load, the temperature of the winding is 75oC. The temperature coefficient of resistance for copper at 0oC is 0.00427 per oC. What is the winding resistance at full load? a. 0.512 ohm b. 0.315 ohm c. 0.298 ohm d. 0.271 ohm
In the single-phase, three- winding, transformer, the primary current is equal to lo at the condition of ints there is no load on tertiary windings the current in secondary windings equal to zero the resistances (R1, R2, and R3) in transformer windings are equal the inductances (L1, L2, and L3) in transformer windings are equal.