Best and Most trustworthy Star - Delta Connection Assignment Help Services at Your Doorsteps!

Home   Course  
Previous << || >> Next

DO YOU WANT TO EXCEL IN STAR - DELTA CONNECTION ASSIGNMENT? HIRE TRUSTED TUTORS FROM EXPERTSMINDS AND ACHIEVE SUCCESS!

Q1. For a Yd1 transformer:

(a) Draw the connection diagram

The Star - Delta connection is shown below

Star - Delta Connection Assignment.png

(b) Show how the connections must be modified to allow parallel operation with a Yd11 transformer.

Yd11 - Here 11 represents the phase displacement. This is between the HV and LV windings.

11 = 330o lagging or 30o leading

Star - Delta Connection Assignment1.png

(c) Draw a phasor diagram for the modified connection.

Star - Delta Connection Assignment2.png

EXPERTSMINDS.COM ACCEPTS INSTANT AND SHORT DEADLINES ORDER FOR STAR - DELTA CONNECTION ASSIGNMENT - ORDER TODAY FOR EXCELLENCE!

Q2. In your own words, state the three essential and two highly desirable conditions which must be fulfilled for two 3-phase transformers to operate satisfactorily in parallel. State briefly what you think may be the possible consequences of not complying with these conditions.

The assumptions are

a) Both the transformers should have same phase shift.

b) Paralleling via distribution or transmission circuits which consists of cables and overhead lines.

c) When connected in no phase shift condition the primary and secondary are in phase. But when connected differently, the secondary voltage waveforms will differ from the primary voltage waveforms by 30 degrees. And is called a 30 degree phase shift. Parallel connected transformers will have same phase shift.

d) For satisfactory operation the voltage ratios could be same

e) The leakage impedance is inversely proportional to the KVA rating

f) Proper connection of transformers that means the polarities is more important. If polarities are reversed it can lead to damage of transformer.

NEVER LOSE YOUR CHANCE TO EXCEL IN STAR - DELTA CONNECTION ASSIGNMENT - HIRE BEST QUALITY TUTOR FOR ASSIGNMENT HELP!

Q3. (a) Two single-phase transformers have the following impedances referred to the secondary side. Unit A rated 250 kVA (0.09 + j2.7) Ω Unit B rated 400 kVA (0.04 + j1.6) Ω. Determine the load taken by each machine as a percentage of its rating when they share a common load of 500 kVA at 0.73 p.f. lag.

To calculate -

Unit A rated 250 kVA (0.09 + j2.7) Ω

Unit B rated 400 kVA (0.04 + j1.6) Ω

Common load of 500 kVA at 0.73 p.f. lag

Unit A

Unit B

(0.09 + j2.7) Ω =2.7015L30

(0.04 + j1.6) Ω


Choose a base = (250/400)x(0.04 + j1.6)

0.625(0.04 + j1.6) = 0.025+ j1

= 1.0003L40

The load taken by each machine as a percentage of its rating

S = 250x(2.7015/1.0003) = 675.17KVA

S = 400x(2.7015/1.0003) = 675.17KVA = 1080.27KVA

Q3. (b) Transformer A is rated at 300 kVA with an impedance of (0.09 + j0.18) Ω. Transformer B is rated at 200 kVA with an impedance of (0.09 + j0.23) Ω. If these transformers are connected in parallel to supply a common load, determine the percentage overload on B when A supplies its full load at p.f. 0.45 lag.

To calculate -

Transformer A is rated at 300 kVA with an impedance of (0.09 + j0.18) Ω.

Transformer B is rated at 200 kVA with an impedance of (0.09 + j0.23) Ω.

Transformer A

Transformer B

(0.09 + j0.18) Ω = 0.2012L61.36

(0.09 + j0.23) Ω


Choose a base = (300/200)x(0.09 + j0.23)

1.5(0.09 + j0.23) = 0.135+ j0.345

= 0.3705L67.63

The load taken by each machine as a percentage of its rating

S = 300 x (0.2012/0.3705) = 162.91KVA

S = 200x(0.2012/0.3705) = 108.61 KVA

ORDER NEW STAR - DELTA CONNECTION ASSIGNMENT & GET 100% ORIGINAL SOLUTION AND QUALITY WRITTEN CONTENTS IN WELL FORMATS AND PROPER REFERENCING.

Q4. From the operating chart shown determine the following performance limitations for a generator:

Star - Delta Connection Assignment3.png

(a) where the power limit and the MVA limit coincide;

(i) the power factor = 0.83

(ii) The load angle = 24.59

(iii) The MVAr output = 0.12

(b) where the power limit and the stability margin coincide;

 (i) The p.u. excitation = -0.7-j0.83

(ii) The MVA output = √(0.832+.122) = 0.8417.

GET GUARANTEED SATISFACTION OR MONEY BACK UNDER STAR - DELTA CONNECTION ASSIGNMENT HELP SERVICES OF EXPERTSMINDS.COM - ORDER TODAY NEW COPY OF THIS ASSIGNMENT!

Q5. A 3-phase synchronous generator rated at 570 MVA is connected to an infinite busbar. Using the data given in the table below, plot the capacity chart of the generator.

Quantity

Value

Synchronised Reactance

2.0 p.u

Excitation Limit

2.8 p.u

Maximum Margin

570 MVA

Turbine Power Limit

500 MW

Stability Margin

10% Full Load Power

Star - Delta Connection Assignment4.png

Tag This :- TG88TER314ELE Star - Delta Connection Assignment Help

get assignment Quote

Assignment Samples

    Business Model Assignment Help

    business model assignment help - The present solution is based on the business model. The total word count of this solution is more than 200 words.

Get Academic Excellence with Best Skilled Tutor! Order Assignment Now! Submit Assignment