Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Electrical & Electronics Expert

ELECTRICAL SYSTEMS

TRANSFORMERS - SHORT CIRCUIT AND OPEN CIRCUIT TESTS

Objectives

1. To enhance familiarity with the measurement of electrical a.c. quantities.

2. To perform practical measurements on transformers.

3. To find out the efficiency and voltage regulation of a loaded transformer.

- Open circuit test circuit.

2406_open circuit test.jpg

V1oc is set to the transformer rated primary voltage.
Poc is the transformer core loss - the input power, in watts, with no secondary load.

Transformer    frequency    V1oc    Poc     VAoc      pfoc       A1oc        V2oc

1

2                           

- Short circuit test

2034_short circuit test.jpg

V1sc is set so that the transformer secondary current is set to its rated value.
Psc is the total transformer I2R losses when it is operating at full load.

Transformer    frequency    V1sc    Psc    VAsc      Pfsc       A1sc       V2sc

1

2                           

During the open circuit tests, I2R losses are negligible and during the short circuit test transformer core losses are negligible. Thus when the transformer is operating at full load (its rated voltages and currents), the total power loss is the sum of the core loss measured during the short circuit test and the I2R loss measured during the open circuit test.

- Calculations

Perform the following calculations on the test results for both transformers.

1.   The total power loss on full load.

2.   The full load efficiency of the transformers at loads of 10%, 50% and 100% and power factors of 1, 0.9 and 0.7.

3.   Determine the per unit voltage regulation of each transformer.

4.   Draw the simplified equivalent circuit of the transformers and find out the equivalent circuit parameters for both.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M91495

Have any Question? 


Related Questions in Electrical & Electronics

1 state the relationship between polarization current

1. State the relationship between polarization current density and electric field intensity. How is it taken into account in Maxwell's equations? 2. What is the revised definition of D? 3. State the relationship between ...

1 how is the magnetic flux density defined in terms of

1. How is the magnetic flux density defined in terms of force on a current element? 2. How is the magnetic flux density defined in terms of force on a moving charge? 3. What are the units of the magnetic flux density? 4. ...

When the potential energy of is given derive the

When the potential energy of is given, derive the variational equation using the principle of minimum potential energy. Problem :- Derive the weak form of a simply supported beam problem.

1 summarize maxwells equations in integral form discuss the

1. Summarize Maxwell's equations in integral form. Discuss the interdependence of timevarying electric and magnetic fields, with the aid of an example. 2. Which two of the Maxwell's equations are independent?

1 a 15 v aa battery that costs 1 is rated at 18 ah what is

1. A 1.5 V AA battery that costs $1 is rated at 1.8 Ah. What is its cost per kWh? 2. Suppose a 12-V battery bank rated at 200 Ah under standard conditions needs to deliver 600 Wh over a 12-h period each day. If they oper ...

Find the disruptive and visual corona voltage of a grid

find the disruptive and visual corona voltage of a grid line operating at 132kv ,conductor diameter =1.9cm,conductor spacing =3.81m,temp=44,pressure=73.7,conductor surface factor ;fine weather=0.8;rough weather=0.66

Referring to the figure assume the flow to be frictionless

Referring to the figure, assume the flow to be frictionless in the siphon. Find the rate of discharge in cubic feet per second, and the pressure head at B if the pipe has a uniform diameter of 1 in. How long will it take ...

1 in logisim implement an 8-to-1 mux using 2 4-to-1 muxes

1. In Logisim implement an 8-to-1 MUX using 2 4-to-1 MUXes and a 2-to-1 MUX. 2. In Logisim implement an 8-to-1 MUX using 4 2-to-1 MUXes and a 4-to-1 MUX. 3. In Logisim implement a circuit similar to the one in figure 8-1 ...

1 briefly discuss the solution of the transmission-line

1. Briefly discuss the solution of the transmission-line matching problem. 2. How is the length of a short-circuited stub for a required input susceptance determined by using the Smith Chart?

Consider a simple shear deformation of a square whose

Consider a simple shear deformation of a square whose deformed geometry is given as x 1 = X 1 + αX 2 , x 2 = X 2 , x 3 = X 3 When the material is incompressible and St. Venant-Kirchhoff material properties are given as E ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro