Answer / e. segovia

In 3ph star connections we can prove by means of drawings
or maths methods that Line current = SQRT(3)*Phase
current, and in delta connections Line current = Phase
current, that is why we use star-delta connection for
heavy motor startings. This means we can lower the current
at starting and then after having overcome the system
inertia we swap to delta connection. worth mentioning that:
In delta, Line voltage = Phase voltage
In star, Line voltage = SQRT(3)*Phase voltage.

Answer / ald

Star connection--- Line current = phase current
Line voltage = phase voltage x 1.732

Delta connection --- Line voltage = Phase voltage
Line current = phase current x 1.732

how to calculate the earth fault current

0 Answers  

---

Initially motor starts with star connection ,after few timing changes to delta connection, why the motor should run continously in star connection,it gives high torque & low current?

3 Answers  

---

What's ND relay & it's functions?

2 Answers  

---

cost of operation of which plant is least?

6 Answers  

---

For example, if I use Star delta transformer for distribution, Can I Connect 230 V lighting load bewteen secondary phase & primary neutarl. What will be the effect, if I connect in this manner?

2 Answers  

---

Dear all, how we select the cable size according  to current with or without including different correction factor , is there any direct method for sizing of cable... 

0 Answers   Kharafi National,

---

explain all the classes with example

0 Answers  

---

Can VFD step up to 60 Hz if it is designed to receive 50 Hz input?

3 Answers  

---

What is the general system requirement of alternator?

0 Answers  

---

What is the fuction of UV & how it works in circut breakers? is it one type of relay?

4 Answers  

---

how to select earthing wire? procedures and parameters?

2 Answers  

---

why we cant control neutral instead of phase in single phase?

3 Answers  

---