Answer / somnath sharma

The use of earth switches is to send any trapped charge in the line into ground after the line is switched off.
Mainly what happens, when the line is switched off, some charges remain trapped in line due to their own capacity and also due to influence of side by X-line. This trapped charge is dangerous if someone goes for maintenance of that very line. So it is very much required to neutralise that much charge and here comes the use of earth switches.

Answer / venky_eee07

earth switches used in substation . in that when isolator
OPEN condition earth switch is CLOSED. here any induction
that passes thro' earth switch to ground.when isolator in
CLOSED condition Earth switch should be Open

Answer / mohammad

Earthing Switch is necessary to earth the conducting parts
before maintenance and also to provide deliberate
short-current while testing.This enables various tests to be
performed on the Switchgear or item of equipment, such as
testing the current Transformer of measuring the operating
time of breakers, without having to open the enclosure.
During normal operation the insulation is bypassed by a
short-circuit-proof link.

I have 2 Nos of 2500kVA 33/0.415V cast resin transformers. How to decide on ampere rating of HT Panel? Also advise me how many panel RMG i have to consider whether 4 panel ok?

1 Answers  

---

Define protection core in CTs Ex. 5P10, 5P20 etc.

1 Answers   HPL,

---

what is earthed and inearthed cable or system?

1 Answers   CCCL, L&T,

---

why are the maintaine power factor and how can this control and this is how work.

0 Answers   Mukand,

---

what is difference b/w bus duct & bus bar.

2 Answers  

---

---

Dear sir,how should i set the relay in star delta starter..say ex i am having 4ohp motor,,wht should be the relay setting...?

4 Answers  

---

which is best ac or dc

3 Answers  

---

1) why a dg set shows variation of power factor and load when synchronised with other dgs? 2)Why the load sharing is not become equal in all dgs?. 3)When a dg set will not run on auto start?

0 Answers  

---

Hi, We facing one similar problem in our computers i.e we are newly constructed our design department after that shifted our computers but our computer desktop screen is vibrating. we are conducted our electrical maintainance person he told that is UPS problem, then we changed the UPS also again we are facing that problem in that room only. then we put lcd monitors that problem is solved. But in other monitors why the computer desktop screen is vibrating please give a suggestion to me. Regards, Raju.N.G

10 Answers  

---

MCB MCCB ACB VCB

1 Answers  

---

why generator one end side star neutral point given? if this point not given what happen?

1 Answers  

---

1. If we apply dc supply to the primary winding of transformer it will be burnt out. similarly dc supply is given to field winding of syn. motor and armature winding of dc motor, they are safe. (Remember both windings inductive nature) what is the reason behind that?

2 Answers  

---