Answer / m.b.parthasarathy

1. You've not mentioned clearly that the short occurred either in transformer or control board.
2. There my be many reasons.
3. In rush voltage may be higher.
4. The device(IGBT) used in the UPS, would be lower value. say 150A/400/600V
5. for ex, the above said UPS, 200kva/480v dc, due to improper maintenance of battery, weakness or prone to ageing the DC may be very low. Instead of 480V Dc it works only in 444V dc. Two or Three batteries may be getting weak.
6. Insulation of the transformer may be worn out

how to calculate the megger values for motor, cables and transformers?

2 Answers   ITC Infotech,

---

what is the rating of power generation in india?

10 Answers   Siemens,

---

What is the use of centrifugal switch in 1phase induction motor? Why is it so called?

2 Answers  

---

What is Percentage impedence of a transformer? why it is expressed at a percentage? what is the importance of percentage impedence in case of a transformer?

0 Answers   Haldia,

---

Using 11000V/433V,3 ph,50Hz,500 KVA, what is the maximum capacity of motor in KW that can be connected and started at a single moment? Also explain about any calculations and formulas used in deriving the same.

4 Answers  

---

---

The shot circuit in any winding of transformer result? Explain

0 Answers  

---

wht do u mean by constant flux linkage theorem ?

3 Answers  

---

How do we find the rating of a transformer, if it got burnt badly.

0 Answers  

---

what is difference between differential protection and distance protection and how we calculate the sloop?

5 Answers   OPS, Power Grid,

---

On which side, taps are provided in tap changing transformers and why?

2 Answers  

---

I WANT BHEL PREVIOUS QUESTION

0 Answers   Bhel,

---

What is limitedly stable system?

0 Answers  

---