Answer / ravikumar.g

If the transformer oil dielectric strength is low we do the
Oil Filtration. ofter the oil filtration we tested the oil
by using the testing unit it will show 80 KV. if the oil
was fulley Carbonised so we have to replace the oil.

Answer / alex

Transformer Dielectric oil is tested in a Test Cell, I have
a few of them at home that I inherited from the origional
designer of the test. They look like a thermos flask and you
fill them with a bit of the oil from the transformer and
insert a center section that sits 2mm away from the surface
of the inside of the flask all around (2mm dielectric gap
all round). It is held there with glass / Mica supports. 2KV
is then passed between the inner and outer surfaces (via the
oil) to test its dielectric strength. A high voltage bridge
is normally used to get accurate resistance readings. If
dielectric strenth is low due to contamination it is replaced.

in dc shunt motor if field winding is shorted then

0 Answers  

---

Difference between divercity and power factor

1 Answers  

---

1000kva = how much kvar

3 Answers  

---

which protection function should measure RMS value of current&DFT value of current?

0 Answers  

---

A cable with concentric PE conductor must be used with frequency converter circuits what does its means.?

0 Answers  

---

relation between voltage and frequency.

5 Answers   IIUI, Lucky Cement, Reliance,

---

Can we use droop CT in neutral in place of W phase of alternator ?

2 Answers  

---

what is arc flash and what are the hazards involved

0 Answers   Reliance,

---

In case of 3 phase motor why it is called single phasing by failure of one phare unless there is rest two phase are acting. ?

3 Answers  

---

what is Aircraft earthing and what does it do?

6 Answers  

---

how we identify AC or DC machine at the time of seeing, with out use of name plate?

4 Answers  

---

How do you select a cable size(Cu & Al) for a particular load?

2 Answers  

---