Answer / v.sugumar- kurinjipadi-cuddalo

surge arrestor installed in indoor application like SWG
panel, HT motor termination box and etc..Lighning arrestor
installed in out door,example: top of building,and it is
connected to earth, incase of lighting air terminal will be
atracted by lightning and it is grounded.

Surge arrester installed in the power line, incase of hi-
sugre in the line, surge arrester (MOV) metal oxide
verister will conduct to the ground, and it will return
back to normal state. MOV during normal state the
resistance is high, when the surge incresed above the
certain limt it wil reduce the resistance.

Answer / eee

surge arrestor: these are capacitive/ solid state devices
which prevents sudden rise in voltage (max 2Vrated)
lightning arrestors: these are nonlinear elements, provides
high impedance in normal working, very low impedance at very
high voltage (lightning)....
withgap metal oxide will have higher voltage carrying
capacity. then the without gap MO.....

In a power conditoining unit (inverter) of a solar plant when we measure the d.c. current fed by different strings of solar plates to inverter, the current in the negative wire is less almost by 1 ampere to the current in its positive wire say current in positive wire 5 A , then current in negative wire of the same string is 4 A. Since the current entering should be equal to current leaving then why the current is noticably less in negative wire.

0 Answers  

---

how is working the APFC when varying the load?

1 Answers  

---

IF 5000amp current on LT 440V. then how much it will draw amp on HT 11KV side

10 Answers  

---

i want to syncronise 5 nos of DG. How? pls reply

3 Answers  

---

What is relation between transmission lines & Communication lines ?

0 Answers   NTPC,

---

---

The 3 phase Delta connection RB=440V, BY=350V,.......* is Line to Line voltage RY= ? And Formula....?

0 Answers  

---

what is the mazor difference between the induction transformer and synchonous motor?what is the similarity between them?

1 Answers  

---

What is the working of SCM CT or purpose in genrator ?

3 Answers   Bhel,

---

In Generator How suction compression power and exhaust works ?

0 Answers   Sify,

---

A charge of 240 C is transferred in 2 minutes. The current flowing is:(a) 480A(b) 120A(c) 2A(d) 8A

2 Answers  

---

Can someone explain how does an IDMT relay works.

1 Answers   AFM,

---

Differene between KVA and KW.

6 Answers   Bharti,

---