Answer Posted / aamod tripathi.

The main use of Isolation Transformer is to Isolate the
circuit without changing the voltage ratio. i.e. 1:1. It is
generally used in LT (415 V Three phase systems).

The isolation is needed because the LT system is much prone
to faults and the faults like line to ground faults are
common. At this level of voltage most of the petty but
important loads are connected. Human interface is maximum
and the system is not as Ingress protected as in case of HT
switchgear (Where seperate room and skilled persons only
have access). Therefore the fault level is dangerous and the
consequences can be even dangerous. Therefore to Reduce
fault level Firstly a transformer is inserted thus its
impedance %z comes into circuit (Series Impedance). And even
if fault occours you/ Device is isolated from the main
circuit which is actually feeding the fault. Thus it keeps
one safe and Protects severe damages that could have
happened otherwise.

what should be the acceptrd value of winding resistance for 2.5MVA transformer

2360

---

How to find out damper winding failure for synchronous machine?

1572

---

Whata are the types of Cables?

2224

---

How do you select the pickup value of the relay?

1377

---

salam,hi, i need to know what the spesification of 300amp msb...

2081

---

for a 400kv t/m line with 10 ampere current will corona occur?

2253

---

if any body have question paper of railway (section engineering),then plz send me .i will thank of him/her.

2037

---

hi i have applied for lic of india south cenrtal zonal ,hyd. i didnt get hall ticket till now.let me know how can i get form internet

2041

---

whit is 33kv power 300*300 cable full current with formula

1861

---

What is the function of auadag in a cro?

1183

---

what is excitation/

2283

---

what is mean by dual digital protection in the relay field?

1988

---

State norton’s theorem?

1175

---

lorteny method

2048

---

No load tap changing transformer working

1716

---