Answer / ruben

UPS has internal bypass and used if in case there is some
problem within the UPS, ie. overload. the load will be
automatically fed from the bypass circuit. the maintenance
bypass is an external circuit or feeder that is use to feed
the load (bypassing the UPS). this will allow the user to
remove completely remove the UPS from the network/system for
maintenance or replacement.

Why dnt we generate 5-ph or 7-ph supply like as 3-ph supply

2 Answers  

---

What is the difference b/w RMU & substation

1 Answers  

---

why do we generate sinusoidal ac?can we generate some other waveforms by alternators?

11 Answers   Siemens,

---

why swityard is necessrry requirement in any bis power distributin systems?

0 Answers  

---

please send me last 5 year interview questions

0 Answers   ONGC,

---

what mean by analog ,digital,numerical meters and relays? say the example?

0 Answers   ABB,

---

Why short circuit calculation is not required in LT cable sizing and requiredin HT cable sizing only

2 Answers   Chemtex,

---

What is difference between earth leakage relay and restricted earth fault relay ?

22 Answers  

---

what is ICU and ICS in breaker ratings

1 Answers   QAFCO,

---

1. what is exciting winding, rotor winding, startor winding. and how it works? in ac generator

3 Answers  

---

we know that dc motors are more superior then three phase induction motors in torque generation though they are not much used in industries why?

5 Answers   Essar, L&T,

---

how to can we synchronize different capacity of DG sets.60kva& 250kva?

2 Answers   Power Plant,

---