A single phase, 250 kVA, 10kV/2kV 60 Hz transformer has the following equivalent circuitparameters referred to the high voltage side, assuming the cantilever equivalent circuit,with exciting branch on transformer primary.RC(HV) = 60.2 kNXm(HV) = 18.44 knReq(HV) = 3.112 nXeq(HV) = 6.27a) Determine the no-load current drawn from the sourceb) Determine the no-load core power lossc) Determine the no-load power factord) Determine the full-load copper loss

Given Single phase transformer 250 KVA,10 Kv/2Kv 60 HzRc(HV)=60.2 kΩ Xm(HV)=18.44…

A single phase, 250 kVA, 10kV/2kV 60 Hz transformer has the following equivalent circuit parameters referred to the high voltage side, assuming the cantilever equivalent circuit, with exciting branch on transformer primary. RCHV) = 60.2 kQ Xm(HV) = 18.44 kQ %3D %3D Req(HV) = 3.112 Q Xeq(HV) = 6.27 S a) Determine the no-load current drawn from the source b) Determine the no-load core power loss

A single phase, 250 kVA, 10kV/2kV 60 Hz transformer has the following equivalent circuit parameters referred to the high voltage side, assuming the cantilever equivalent circuit, with exciting branch on transformer primary. RCHV) = 60.2 kQ Xm(HV) = 18.44 kQ %3D %3D Req(HV) = 3.112 Q Xeq(HV) = 6.27 S a) Determine the no-load current drawn from the source b) Determine the no-load core power loss

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 3.63P: A 23/230-kV step-up transformer feeds a three-phase transmission line, which in turn supplies a...

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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.
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The ratings of a three-phase three-winding transformer are Primary(1): Y connected 66kV,15MVA Secondary (2): Y connected, 13.2kV,10MVA Tertiary (3): A connected, 2.3kV,5MVA Neglecting winding resistances and exciting current, the per-unit leakage reactances are X12=0.08 on a 15-MVA,66-kV base X13=0.10 on a 15-MVA,66-kV base X23=0.09 on a 10-MVA,13.2-kV base (a) Determine the per-unit reactances X1,X2,X3 of the equivalent circuit on a 15-MVA,66-kV base at the primary terminals. (b) Purely resistive loads of 7.5 MW at 13.2 kV and 5 MW at 2.3kV are connected to the secondary and tertiary sides of the transformer, respectively. Draw the per- unit impedance diagram, showing the per-unit impedances on a 15-MVA,66-kV base at the primary terminals.
For a short-circuit test on a 2-winding transformer, with one winding shorted, can you apply the rated voltage on the other winding? (a) Yes (b) No
With the American Standard notation, in either a Y-or-Y transformer, positive- sequen quantities on the high-voltage side shall lead their corresponding quantities on the low-voltage side by 30. (a) True (b) False
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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
In order to avoid difficulties with third-harmonic exciting current, which three-phase transformer connection is seldom used for step-up transformers between a generator and a transmission line in power systems. (a) Y- (b) -Y (c) Y-Y
An ideal transformer has no real or reactive power loss. (a) True (b) False
(a) An ideal single-phase two-winding transformer with turns ratio at=N1/N2 is connected with a series impedance Z2 across winding 2. If one wants to replace Z2, with a series impedance Z1 across winding 1 and keep the terminal behavior of the two circuits to be identical, find Z1 in terms of Z2. (b) Would the above result be true if instead of a series impedance there is a shunt impedance? (c) Can one refer a ladder network on the secondary (2) side to the primary (1) side simply by multiplying every impedance byat2 ?
The ratings of a three-phase, three-winding transformer are Primary: Y connected, 66kV,15MVA Secondary: Y connected, 13.2kV,10MVA Tertiary: connected, 2.3kV,5MVA Neglecting resistances and exciting current, the leakage reactances are: XPS=0.09 per unit on a 15-MVA,66-kV base XPT=0.08 per unit on a 15-MVA,66-kV base XST=0.05 per unit on a 10-MVA,13.2-kV base Determine the per-unit reactances of the per-phase equivalent circuit using a base of 15 MVA and 66 kV for the primary.
Rework Problem 3.14 if the transformer is delivering rated load at rated secondary voltage and at (a) unity power factor, (b) 0.8 power factor leading. Compare the results with those of Problem 3.14. -