Power system class 3. A single-phase 30KVA, 2000V/200V, 60Hz distribution transformer is used as a step-downtransformer at the load end of a 2000V feeder whose series impedance is 1+j20 ohms. Theequivalent series reactance of the transformer is j10 ohms referred to the high-voltage(primary) side. The transformer is delivering rated load at 0.9 power factor lagging and atrated secondary voltage. Neglecting the transformer exciting current and series resistance,determine the apparent power delivered to the sending end of the feeder.

The transformer problem can be solved as below.

3. A single-phase 30KVA, 2000V/200V, 60HZ distribution transforme transformer at the load end of a 2000V feeder whose series imped: equivalent series reactance of the transformer is j10 ohms refer (primary) side. The transformer is delivering rated load at 0.9 pot rated secondary voltage. Neglecting the transformer exciting curr- determine the apparent power delivered to the sending end of the

3. A single-phase 30KVA, 2000V/200V, 60HZ distribution transforme transformer at the load end of a 2000V feeder whose series imped: equivalent series reactance of the transformer is j10 ohms refer (primary) side. The transformer is delivering rated load at 0.9 pot rated secondary voltage. Neglecting the transformer exciting curr- determine the apparent power delivered to the sending end of the

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 3.16P: A single-phase, 50-kVA,2400/240-V,60-Hz distribution transformer has the following parameters:...

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Concept explainers

Fault Analysis

In an electrical engineering system, a fault is an abnormal electric current flowing through the system, and fault analysis is the study of these faults. For instance, a short-circuit is a fault where the live wire touches the ground or neutral wire. If a circuit is interrupted by a failure of a current-carrying wire then an open circuit fault occurs. The open-circuit faults are also called series faults. One or more phases or ground may be involved in a three-phase fault or may occur only between two phases. Current flows into the earth in case of a ground fault or earth fault. For most situations, the prospective short circuit current of a fault that is predictable can be calculated. To limit the loss of service because of a failure, the protective devices can detect fault conditions and operate circuit breakers and also other devices. All phases equally can be affected in a poly-phase system which is known as symmetric electrical fault. The asymmetric fault becomes more complicated to analyze if only some phases are affected. By using methods such as symmetrical components, the power system analysis of these types of faults is often simplified. The main objective of power system protection is to design, detect, and interrupt power system faults.

Question

Power system class

3. A single-phase 30KVA, 2000V/200V, 60Hz distribution transformer is used as a step-down
transformer at the load end of a 2000V feeder whose series impedance is 1+j20 ohms. The
equivalent series reactance of the transformer is j10 ohms referred to the high-voltage
(primary) side. The transformer is delivering rated load at 0.9 power factor lagging and at
rated secondary voltage. Neglecting the transformer exciting current and series resistance,
determine the apparent power delivered to the sending end of the feeder.

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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.
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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.
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