Answer / pillay

The sample oil to be tested for dielectric test is collected
and put into the tester and the average of 6 tests is
taken.The minimum withold voltage is as per local regulations.
causes of low dielectric results are usually exposure of the
insulating oil to moisture through the breather or there is an
exposed opening, poor quality oil being used. high acidic
content.The insulating oil should be replaced or dehydrated.
breathers silica gels should be maintained good all the time
and check for any leaks or any exposure to atmosphere must be
rectified.

Answer / ravikumar.g

The transformer Oil testing to be done in filtration unit
by checking the Oil Testing Kit in KV

20 KV low

when the voltage are not balancing properly and the taps
are changing regurly the oil becomes carbonsied this
carbonsied oil is acts as conductor.

So these problem so we change the Oil.

The salution for this changing the oil the transformer has
to be oilfilteration in once in a year.

Answer / saroj

TRF oil is tested in a glass pot where high voltage,KV is
applied between two electrodes and sparking at electrode to
be observed. For good oil , it comes about 40~60KV/mm .If
it comes lower then filteration is required. Those TRF
having tap changing is frequently required it is
recommended to do filteration in once in year.Also its
value goes low because of moisture ingress in oil .

what is the disadvantage of lagging power factor & why ?

2 Answers  

---

What is ac and dc drive.

1 Answers  

---

What are applications of Shunt release?

2 Answers   Techno Electric and Engineering,

---

What do you mean by distributed winding in alternators? how exactly is 3 phase power generated?

2 Answers  

---

What is the formula to calculate a three phase alternator

0 Answers  

---

---

how to find 5 kilo meter long under ground 33 kv cable fault location if IR VALUE shows 0.05 M ohm @5000 volt.and cable fault locator shows some time fault distance 3 kilo meter ,3.7 kilo meter and some time 1 kilo meter? now how to find the fault location that where is leakage. note--it is tested with 5000 kv megger and insulation resistance is 0.05 M ohm. and some time 0.03 M ohm comes.

0 Answers   OPS,

---

What is Automatic interlocking circuit dighram between two contactor for DG SET panel.

1 Answers  

---

For having nonavailablity of 10 Amps fuse, a lineman replace the same with 5Amps two strand, Do he correct ?

4 Answers  

---

whatis the difference between electrical and electronics?

11 Answers  

---

What is the basic difference between synchronous machine and induction machiine?

1 Answers  

---

funtion of choke

4 Answers   L&T,

---

what is difference between 5A and 100A CT constructional wise and operation?

1 Answers  

---