Answer / manesh.k

We know it as a measuring device.But it can act as
protecting device also.

It is basically a step-up transformer.It raises the
voltage thereby reducing the current(as high as 100A or
more) in a circuit so that it can be measured using a std 5A
or 1A ammeter.Primary is the conductor containing the
circuit in which the current is to be measured.

Answer / subash nayak

Current transformer is a device which helps to measure the
circuit current in which high current flows.Generally we
cannot measure kiloamps by using simple low cost ammeter, so
CTS helps to measure by connecting its primary in series
with the circuit and the low scale ammeter with its secondary.

example : 4000/5 Cts , here easily we can measure the
quantity of current flows in high current circuit by
measuring at its secondary and by multiplying the ratio
factors. Note : secondary of the secondary should not be
kept open while using in live circuit.

what is G.O.D.S. ?

2 Answers   RCE,

---

When we are working on transformer(132\11KV). we are going to isolate the transformer from both HV side and LV side. then we are applying grounding on both side. My question is that we required to isolate the VT which is still connected from secondary side.?

1 Answers  

---

WHY POLARITY TEST OF CT IS VERY IMPORTANT IN SWITCHGEAR

3 Answers   Birla, Reliance,

---

What is SF6 Circuit Breaker?

2 Answers   Amdocs,

---

how to calculate the ac and dc wire losses with calculations plz tell me

3 Answers   Apollo,

---

---

how we sesign the transformer give some specifion regarding design of transformers

0 Answers  

---

how a single machine can act as both motor and generator? and give explanation interms of connections?

1 Answers  

---

whats the differece between Exd and Exe

0 Answers   IFFCO, TN,

---

how work the lighting arrestor?

2 Answers  

---

Whats the principle of lightning? How protection against lightning is achieved? Types of protection? How to select the height of lightning spike? as per the area.

4 Answers   HAL,

---

How to Select a Transformer Rating ?

3 Answers   Tata Steel Limited, Techno Electric and Engineering, Vedanta,

---

what is differential relay in power transformer??

8 Answers  

---