Answer / nur.asidik

you need to consider of breaking capacity too

Answer / matt

Given a system power factor of 0.9, PFC unit of 50kvar we can work out the following

50/0.9 = 56 A real current

56^2 * 50^2 = 75 A apparent current

Cable capacity - 75 * 1.35 = 100 A

Factor of 1.35 used for over rated capacitors as per
industry standards.

Breaker shall be rated at less than the cable capacity but greater than 75A. Increase cable size to suit breaker breaker sizing if required.

Answer / mohan

Amps Per KVAR is between 1.1 to 1.3 Amps

for a 300KVAR panel

the current shall be 130 AMPs(and if the capacitors are
auto swithced , then switching surges need to be considered
hence) * 1.5 Times = 585Amps
The nearest breaker size is 630AMPS

It is preferable to use Capcitor duty contactor for
switching

what's mean by Transient stability analysis?

1 Answers  

---

Why Lighting transformers are used? what will be the current if lightings connected through direct raw power?

1 Answers   BMM,

---

SUPPOSE A CIRCUIT BREAKER HAS TRIPPED THE THE LINE WHEN A FAULT OCCUR ON IT.NOW WHEN THE FAULT HAS BEEN CLEARED, HOW THE CIRCUIT BREAKER WILL CLOSE AUTOMATICALLY NOT MANUALLY.

6 Answers   Bureau of Energy Efficiency, DVC,

---

What is the real use of reactive power in a electrical system other than loss (inductive &capacitive).I want to know its real physical significance.

0 Answers  

---

please design a rectifier with batteries for below requirement and also explain how you calculate this solution, Load = 700Amp DC Backup time = 6 hour. please explain briefly ?????

1 Answers   GNFC,

---

---

How to calcualte the total number of cells required for particular UPS of some X KVA with 3 and 5 hours back-up?

1 Answers   JLL,

---

What should be value of Circuit breaker operating time and tripping time?

3 Answers  

---

WHAT IS DIFFERENCE BETWEEN MANUAL CONTROL AND MAGNETIC CONTROL AND STATE ITS ADVANTAGE /DISADVANTAGE

0 Answers   Siemens,

---

How to work star delts method in the case of single phase motor?

4 Answers   Siemens,

---

What is the meaning, function and application of OLTC?

3 Answers   Home,

---

Can any body tell me about INNER SHUNT COMPOUND MOTOR diagram?

0 Answers  

---

what types of load we get from the national grid? is this capacitive or inductive?

1 Answers  

---