Answer Posted / thuranga

Lightening Arrester is connected in shunt with the lines so
that is protects from lightening.

when ever the lightening occurs, there is a voltage around
some thousands of voltage appear on line (3500V to 5000V)
for a fraction of seconds(25 to 30micro sec.s) which is more
than enough to damage all the equipment in the grid
connected to it. so when a lightening arrester is connected
then is provides low resistance path such that all that high
voltage is directed towards the earth resulting the
protection of all the equipments connected to the grid.

What are the two basic types of transformers?

620

---

What is the rotor frequency of 10 Hp 1440 RPM 50HZ 415V ?

1548

---

State thevenintheorem?

598

---

how does grading rings & spacers in transmission line works? Working Principle?

1597

---

why swityard is necessrry requirement in any bis power distributin systems?

1885

---

---

what is mean by Digital Logic Meter (DLM)

1861

---

Who many reason of ignition fail ?

1469

---

can we use CBCT in neutral of solidly grounded transformer? in place of three phases we can pass only one phase which decreases the size of CBCT?

1763

---

State the formula for overall efficiency of thermal power station

2540

---

In cable sizing calculation (determining the max route length of cable) why we choose the shortest length between cable length of full load current Iflc & starting current Istart?

2776

---

why the difference arise between HT reading & LT reading (submeters fixed in complexes, apartments etc)if the power factos exceed from 0.9 to 1 can the ht meter reads fast?

2192

---

How to calculate the current of Highpressure Mercury Vapour Lamp?what is the basis?whether we have to consider power factor or not?

1653

---

For some transformers we are using solid neutral earthing while some others we are using resistance earthing why ?

1469

---

what are the 4 rules to start the motor?

1677

---

What is notching in dc machine?

1506

---