Answer Posted / nazheer

207 MVA

what is earth-fault?when it occurs? to check where it occurs what type of test should we do?

1997

---

I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?

2314

---

If UG power cable both ends are to be earthed or what? If not why?

1945

---

Can we Co-ordinate relay in Load Break switch?

1962

---

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... 

2162

---

Safety of dry type transformer

1968

---

1.WHAT IS A SMART CAPABLE DB ( DISTRIBUTION BOX) ? 2. HOW TO DECIDE THE TYPE OF DB TO BE USED ( RECESSED/ PLUG TYPE/ SMART ETC ETC? 3. WHAT IS MILLENEUM BUS BAR USED IN DB? 4.DIFFERENTIATE MCCB AND MCB.

1847

---

Explain about 3 phase motor fault current calculation with examples?

2946

---

Define ampere

1300

---

What is the purpose of stand by earth fault protection for transformer ?

2084

---

why the neutral point in connnection oscillates?

2263

---

Define delay time.

1083

---

How to know the following data of synchronous generator 1. D-Axis Unsaturated Reactance 2. D-Axis Unsaturated Transient Reactance 3. D-Axis Unsaturated Sub - Transient Reactance

2011

---

What is the difference between Delta & Wye windings?

2095

---

What is the typical enclosure type used for Indoor switchgear / Outdoor switchgear Units? - In Onshore / offshore Units?

998

---