Answer / hanupowergrid

TAN DELTA TEST:

A pure insulator when is connected across line and earth, it behaves as a capacitor. In an ideal insulator, as the insulating material which acts as dielectric too, is 100 % pure, the electric current passing through the insulator, only have capacitive component. There is no resistive component of the current, flowing from line to earth through insulator as in ideal insulating material, there is zero percent impurity. In pure capacitor, the capacitive electric current leads the applied voltage by 90°. In practice, the insulator cannot be made 100% pure. Also due to the ageing of insulator the impurities like dirt and moisture enter into it. These impurities provide the conductive path to the current. Consequently, leakage electric current flowing from line earth through insulator has also resistive component.

Hence, it is needless to say that, for good insulator, this resistive component of leakage electric current is quite low. In other way the healthiness of an electrical insulator can be determined by ratio of resistive component to capacitive component. For good insulator this ratio would be quite low. This ratio is commonly known as tanδ or tan delta. Sometimes it is also referred as dissipation factor.

why do we prefer a 3-phase delta connected load rather than star connected?

4 Answers  

---

why connecting surge unit in contactor coil

0 Answers  

---

In which working principal temperature transmitter work.explain in detailed.

0 Answers  

---

How we calculate airgap between phases & terminal box of the transformer? any formulae.

1 Answers  

---

I am shobana from Chennai. I am having my personal interview on 19th Dec at Chennai.kindly mail me the questions to mail id shobana.shanthi@gmail.com

0 Answers   Avalon, KK Capital,

---

A 11000/415V distribution transformer is fed 415V upon it's LT side,Do I get 11000V upon it's Primary side ?

7 Answers  

---

In simply words(not explain any formula )what do you mean by power factor.?

5 Answers   DRDO,

---

what is the other name of dc series motor

2 Answers  

---

what is the ciruit diagram of transformer vector grup test?

4 Answers   Green Power,

---

Hi to u all : Friends: Why when operate on 2 phase welding machine the power metr goes reverse ?? the meter is god on other loads. thanks

2 Answers   Gedco,

---

Batteries. What is the difference between Lead and Nickel batteries ?

0 Answers  

---

Is CBCT protect human life? If yes than how?

1 Answers   Torrent Power,

---