Answer / m.waqas(electrical)

both of the techniques are the same .
IN polarization index method the molecules of water are polarized and it takes almost ten mints to polarize the water molecule by using megger. This test is performed in field or you can say on used transformer or on that transformer which remain idle (not in use for long time with oil present in it) where there is a chance of moister presence due to condensation.
The dielectric absorption technique is used for type test(test perform after making transformer) here transformer is new and moister is just remove. As we all know absorption method is quicker than that of polarization(ratio of resistance measured 15 sec to 1 minit ).
BUT polarization technique is always preferred for good results or reliable results.

For 280kw power. Which cable I can usr

3 Answers   Clean World, TCS,

---

What is the Procedure for selecting a Cable, Breaker and Transformer for particular load.

3 Answers  

---

What should be setting for alarm,tripping and cooling fan on for power transformer's oil temp. and winding temp. indicator?

0 Answers  

---

What is CBCT ? Why & Where it is used?

14 Answers   BCT,

---

why the the phase transformer's nuetral has been grounded

2 Answers  

---

---

why we use copper earthing for neutral while for body GI.

1 Answers   Chennai Metro Rail Limited CMRL, Valeo Lighting Systems India Private Limited,

---

For high voltage and low current Circuit Breaker preferred is vacuum circuit breaker.why?

1 Answers  

---

what use marshalling kishock in power transformer?

2 Answers  

---

what are the differant std sizes of cable trenches?

0 Answers  

---

why transformer neutrol is grounding

6 Answers  

---

Can we use LT(150 sq. mm) cable in place of HT (120 sq.mm.) cable.?

1 Answers  

---

Difference between ELCB and RCCB?

5 Answers  

---