Transformer Impedance

Slides:

Advertisements

Similar presentations

CURRENT TRANSFORMERS AND VOLTAGE TRANSFORMERS

Advertisements

ENERGY CONVERSION ONE (Course 25741)

EE 369 POWER SYSTEM ANALYSIS

Department of Electrical and Computer Engineering EE18B.

INDUCTION MOTOR No-load and blocked rotor tests

“Real” Transformer E P = 4.44N P fΦ P E S = 4.44N S fΦ S Φ P = Φ M + Φ lp Φ S = Φ M – Φ ls E P = E’ P + E lp E S = E’ S - E ls.

TRANSFORMERS. TRANSFORMER PARAMETERS Turns Ratio (n) It is defined as the ratio of the number of turns in the secondary winding (N sec ) to the number.

Lecture 4 Overview More circuit analysis –Thevenin’s Theorem –Norton’s Theorem.

ECE 4411 Voltage Regulation. ECE 4412 Voltage Regulation (continued) E nl = no-load output voltage –Measure with a voltmeter when no load is connected.

Transformer Professor Mohamed A. El-Sharkawi. 2 Why do we need transformers? Increase voltage of generator output –Transmit power and low current –Reduce.

Problem #2-8 A 480 – 120 V, 60 Hz transformer has its high voltage winding connected to a 460 V system, and its low voltage winding connected to a 24/32.8°Ω.

Real Transformer 1- There are flux leakages 2- Some power loss (copper, core losses) 3- Limited permeability Let’s see what effects these realities would.

ECE 201 Circuit Theory I1 Source Transformation Convert a Voltage Source in Series with a Resistance into A Current Source in Parallel with the SAME Resistance.

“Ideal Transformer” E’ P, E’ S = Voltages induced in the primary, secondary E’ HS, E’ LS = Voltages induced at High-side, Low-Side V HS, V LS = Nameplate.

Circulating Current – load switch open. Circulating Current load switch closed.

Announcements Be reading Chapter 3

Lecture 8 Transmission Lines, Transformers, Per Unit Professor Tom Overbye Department of Electrical and Computer Engineering ECE 476 POWER SYSTEM ANALYSIS.

Transformer with open secondary.

Elec467 Power Machines & Transformers

Example 1 A 9375 kVA, 13,800 kV, 60 Hz, two pole, Y-connected synchronous generator is delivering rated current at rated voltage and unity PF. Find the.

Chapter 2 Transformers.

1.6 Real Single-Phase Transformer.

Announcements For lectures 8 to 10 please be reading Chapter 3

Announcements Please read Chapter 3 H4 is 4.34, 4.41, 5.2, 5.7, 5.16

Induction Motors.

Announcements Please read Chapter 3; start on Chapter 6

Modeling of Power Transformers A Static Device. Transformers The transformer enables us to utilize different voltage levels across the system for the.

Announcements For lectures 9 and 10 please be reading Chapter 3

BASIC ELECTRICAL TECHNOLOGY DET 211/3 Chapter 6: Single Phase Transformer (Continued)

Magnetic field due to an electric current

1 ELCT Class performance (Quizzes 1&2 and Midterm)

Transformer Current & Voltage Practice

Lecture 04Electro Mechanical System1 Ideal Transformer  An ideal transformer  Transformer has no losses and core is infinitely permeable  All fluxes.

E E 2415 Lecture 12 Mutual Inductance and Ideal Transformers.

Transformer A transformer is a static piece of equipment used either for raising or lowering the voltage of an a.c. supply with a corresponding decrease.

Per-Unit System.

SARDAR VALLABHBHAI PATEL INSTITUTE OF TECHNOLOGY PREPARED BY: 1)BALDIWALA ALIABBAS ( ) 2)PARTH GUPTA ( ) 3)ANIL KHATIK ( )

SMJE 2103 Electrical Power System

SMJE 2103 Electrical Power System 3- Ph Power Apparatus.

Question 1 a.Find the magnitude of phase voltage and current b.Find the average power to each phase and the total load. c.Determine the reactive power.

True-False Questions. A magnetic core material may exhibit hysteresis or saturation but not both.

Lesson 12: Parallel Transformers and Autotransformers ET 332b Ac Motors, Generators and Power Systems 1 Lesson 12_et332b.pptx.

DCMT PRESENTATION DEVANSH KHARE ( )

Transformer Professor Mohamed A. El-Sharkawi

Equations, Performance, Electrical Equivalent Circuits

True-False Questions.

Lesson 10: Transformer Performance and Operation

Announcements Please read Chapter 3

Chapter 14 Resistive AC Circuits.

Lesson 9: Practical Transformer Model and Calculations

ECE 476 POWER SYSTEM ANALYSIS

B4.2 Power System One-Line Diagrams

Transformer heat run test: The loading back method

Circuits II EE221 Unit 10 Instructor: Kevin D. Donohue

BASIC ELECTRICAL TECHNOLOGY DET 211/3

Per-Unit System.

Energy Conversion and Transport George G. Karady & Keith Holbert

Φ 3. Transformer Models. Turns ratio 7200:240 (30 : 1)

Single Phase Transformers ELE 2103 Electrical Machinery1

Energy Conversion and Transport George G. Karady & Keith Holbert

Ch. 13 – Ideal Transformers

Utilisation of Electrical Energy

EUS 260 Capstone Project.

Exercise Session 2 Power systems.

Equations, Performance, Electrical Equivalent Circuits

Source Transformation

PRACTICAL TRANSFORMER

Electrical Machines (EELE 3351)

Unit-1 Transformer.

Presentation transcript:

Transformer Impedance

In Simple Terms Transformer impedance is the % of rated voltage required to push 100% of the rated secondary current when the secondary winding is short circuited.

Simplified Equivalent Circuit Transformer impedance Z = R + jX Z is represented in percent of rated primary voltage to cause rated secondary current in a short-circuited secondary.

Transformer Impedance Transformer Impedance Is A Major Parameter To Enable Parallel Operation Of Transformers For Proper Paralleling The Following Are Required: Same Percentage Impedance For All Units (With Some Tolerance) Same Phase Relationship Between Windings Same Voltage Ratios Similar Power Ratings

Maximum available fault current Calculate the secondary (LS) current at the given MVA Calculate what the impedance related voltage is based on the % impedance. Calculate how many times the calculated voltage will go into the rated primary voltage. Multiply this number by the full load current at the MVA

Now The Easy Method Fault Amps = Full Load Amps ÷ Impedance