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.

In a large office how do we calculate required number of light fittings, assuming fittings are 4x18W or 2x36W fluorescent fitting ?

0 Answers  

---

What is mean CT Saturation? How to calculate?

13 Answers   NCC,

---

What are the usege & different between UPS & batteries with charging system in in Substation?( UPS 120V AC & battery charger is 120v DC)

1 Answers  

---

why the name mho relay,despite the locus of circle is impedance?

1 Answers   KSEB,

---

What we mean by vintage of an engine+Generator?

0 Answers  

---

Why don't we provide SURGE ARRESTORS for Transformer feeders?

5 Answers  

---

if the load is reactive then what is the use of calculating the real power and what is the use of reactive power if my question is wrong please excuse me..

1 Answers  

---

what is S.T?specify the range?

2 Answers  

---

why +24 v and -48 v give to BTS? If -48v protect from surge then why we not use -24 v?

0 Answers  

---

how i decrease the neutral to ground voltage , thats i read 7v on my digital meter.i dont know about my earth pit.

2 Answers  

---

we are operationing 3NOs 800 Kva generators by singronyus.specialey evening time our panel trip. the panel showing generator earth fault

4 Answers   RRB,

---

Why is it that North America uses 60 hz frequency while Europe uses 50 hz?

4 Answers  

---