Answer / ranjan sannyasi

Many of test over an 3 phase transformer you can done, you
have to mentioned about megger test,so that test what actual
done,it's ur qsn...may i r8?
so, It's actually IR test means Insulation Resistance(IR)
test,how much insulated the transformer winding in between
their winding(primary & secondary).You could be known by
meggar test.
1.1st You have to do the PHASE TO EARTH test,how to do the
test? megger have two terminal,one of them you have to
connect with 1st phase (R-phase) or whatever(it may be
another two Y or B),must be one by one,it ds'nt matter ok,&
another with transformer body,its the earthing path.
regarding this test obtaining three of value must be
100,it's must be noted that 100 value is the accurate,if any
of value is 0 then some where in b/w winding & body it may
be leakage,for that DC current** is flowing through the
winding to earth.

2. 2nd test is the vital one.It's PHASE to PHASE TEST.It's
done by like that, suppose megger one terminal is connect R
phase and another one done by Y phase, so like that 1st R-Y,
2nd Y-B & last B-R, same you have find 3 value,like above
those.If all the value are 100 then its insulation b/w
winding are accurate,there have no insulation fault.

Answer / k.prakashchandra

With all the connections removed 1.Primary to body 2. Sec to
body 3.Between Pr and Sec .Find PI value also

why single induction motor is not self starter?

3 Answers  

---

i seen a 132kv/11kv transformer,and thier is a sugar factorys 10MW EXPORT PLANT,MY QUESTION IS THAT WHEN THEY EXPORT ELECTRICITY THEY USE THE SAME TRANSFORMER AND THE CONNECT IT TO 132/11KV TRANSFORMERS SECONDARY SIDE CAN ANY ONE EXPLAIN IT.. THE TRANSFORMER IS OF KIRLOSKAR MAKE AND IT HAS TAP CHANGER.

1 Answers  

---

why tungsten is used in incandescent lamp instead of nichrome though nichrome has high melting point

2 Answers  

---

What are difference between earthing switch and earthing truck ? What is the operation philoshopy of earthing truck ? Wht are the component of earthing truck ?

2 Answers   Reliance,

---

What are the different types of testing in ht cables?

3 Answers  

---

On 400 amp factory load how kvarh capacitors provide

0 Answers  

---

What is the application of Dyn1 and Dyn11 vector group of transformer?

0 Answers  

---

IN a transformer during power supply how the LV and HV bushing works??

3 Answers   CSEB,

---

which are the criterias needed to select the kind of neutral earthing(solid earthing,resistance earthing,etc.) at various voltage levels in electrical distribution?

0 Answers  

---

How to calculate the efficiency of Turbo Generator(Alternator) in general....?

0 Answers   Thermax,

---

At which time Synchronous generator act as a Synchronous Condenser?

1 Answers  

---

What is the comparison between 30mA DP RCCB and 100mA DP RCCB and can replace it against 63A MCB

0 Answers  

---