Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
279 views
in General by (238k points)
closed by
Two single-phase 150 kVA, 7200 / 600 volt transformers are connected in open-delta. The maximum three-phase load that they can carry is:
1. 300 kVA
2. 75 kVA
3. 259 kVA
4. 249 kVA

1 Answer

0 votes
by (240k points)
selected by
 
Best answer
Correct Answer - Option 3 : 259 kVA

Open-Delta Connection:

  • An open delta connection transformer uses two single-phase transformers to provide a 3-phase supply to the load.
  • An open-delta connection system is also called a V-V system.
  • The Open-delta connection system is usually only used in emergency conditions, as its efficiency is low when compared to the delta-delta (Closed delta) system.
  • The total load carried by an open delta system is 57.7% of the closed delta system.

 

The capacity of open-delta system = √3 × Rating of one transformer

= 0.577 × Rating of the closed delta system

Calculation:

Given,

Rating of one transformer = 150 kVA

The capacity of open delta system = √3 × Rating of one transformer

= √3 × 150 = 259.8 kVA

Therefore, the maximum three-phase load that they can carry is 259.8 kVA

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...