Answer / raghavendran

I am not sure but,this could be the reason, the Electrical
field intensity producing corona on contaminated areas,
water droplets, icicles, corona rings, ... This corona
activity then contributes nitric acid to form a chemical
soup to change the bonding cements and to create carbon
tracks, along with ozone and ultraviolet light to change the
properties of NCI insulator coverings. Other detrimental
effects include water on the surface or sub-surface freezing
and expanding when thawing, as a liquid penetrating into a
material and then a sudden temperature change causes change
of state to a gas and rapid expansion causing fracture or
rupture of the material.

Answer / aboli

I think impure water or ice being good conductor of
electricity,due to ice coating the insulator may get
directly short ckted.this could be called as puncturing of
insulator by ice coating.

How to calculate Earth busbar size & what is the procedure we make for determine that?

1 Answers  

---

Whata are the types of Cables?

0 Answers  

---

what is meant by impedence? can you describe easy becuse iam not well familier in electrical?

2 Answers  

---

why tan delta test is carried out in the power transformer? which parameter are measure?

1 Answers  

---

Can anyone explain about Control and power circuits of star delta starter & DOL starter ? How it works? please!

1 Answers  

---

why it is not advisable to run low rating (19KVA) DG sets in parallel for long durations even though they are provided with droop ckts (QDC)

0 Answers  

---

What is Black-out and Brown-out situation in the context of voltage stability in power system?

1 Answers  

---

how to calculate the transformer losses.

4 Answers   Cipla,

---

why fuse is not applicable for nutral and what will happen when it applied.

4 Answers  

---

How to identify the start and end of 3phase 12 lead motor if U1, U2, etc numberings are lost or erased.

0 Answers  

---

1.what is the difference between transformer differential and busbar differential.2)why we are using 2 slope for trafo diif and 1 slope for busbar diff.3)what is the purpose of metrosil and stabilizing resistor in high impedance relay circuit.4)how metrosil reduce the peak volage.5)what is the funtion of stabilizing resistor

0 Answers  

---

How to test transformer

1 Answers  

---