Answer / dhiraj banka

Class b SPD is for lightning surges & class c SPD is for switching surges.Class B+C protects both from lightning & switching surges.

Answer / vanraj

For surge arrester (lighting arrester) class defines the
capacity of energy can dissipate by SA.

Class in generally not defined by B & C but it defined a
class 2 , Class 3 , Class 4 & class 5 for sub stations.

For 145 kv (110,132 kv ) class 2
For 400 kv ( 400 kv) class 3
For 540 kv (generally not use in india) class 4
For 765 kv Class 5

Neutral CT for 45MVA 132/11 KV YNd11 Transformer. NCT REF CLASS-PS or 5P20 with 20VA burden which is suitable.

1 Answers  

---

What is neutral and how to produced

1 Answers   L&T,

---

In what condition the HT fuse breakes?

0 Answers  

---

electricity board have asked me what size meter i need fitted in my garage, its a 415volt supply and i want to run six 20amp supplies tolifts and things plus ten florry lights , what kva meter do i need??

2 Answers   HCL,

---

can we connect 2.2kw star motor in delta passion?

1 Answers   Zuari,

---

A 30KW motor running at 1450 rpm draws 56A, how would you determine if this is correct or not?

3 Answers  

---

what is the advantages of Lighting transformer?.. is it possible to reduce the power consumption ?.

6 Answers   Lucas TVS,

---

what is difference between start imitation and start interlock for 3 phase motor protection ?

2 Answers   OPS,

---

what do you mean by class PS CT and what are technical details needed for calculating it?

0 Answers  

---

Can RCD's used to protect the VVVF drive if not why.

0 Answers  

---

What fomula is used to calculate: 1. rated frequency withstand voltage, and 2. rated lightning impulse withstand voltage.

0 Answers   PNG Power,

---

what do you understand by dressing a HT/LT pole

1 Answers   Federal Polytechnic Nekede,

---