Answer / sam

Accuracy class of 0.2 means +/- 0.2 % error. But, the
declared accuracy is guaranteed only between 100% & 120%
rating. And, with some increased error, the CT performance
can be guaranteed from 5% loading. Below this load, the
error is not guaranteed. It can be anything.

Normally these classes of accuracy are used for Tariff
Metering by the Utility Company.

In large industrial projects, the project would be
commissioned in steps only. In such a case, initially the
loading will be very low. If the tariff metering CT errors
are haphazard, it may not be acceptable either to the
supplier (in case of negative error) or to the consumer (in
the case of positive error). And the magnitude can be quite
large, say, with a sanctioned demand of 10MVA, even 1%
error means 100kVA.

To cater to such situations, Standards have introduced two
new accuracy classes, 0.2S & 0.5S for tariff metering
purposes. These special CTs guarantee the declared
accuracy, even with 20% loading. And some definite error
can be defined even with a load as low as 1%. Thus they are
suitable for industries where loads are commissioned in
steps or stages.

Answer / k.prakashchandra

's' stands for special.0.2s class cts guarantee the the
specified accuracy even at 1% and 120% of rating where 0.2
class cts may not be accurate upto 5% and beyond 100% 0f
rating

Answer / rao

For 0.2 Class specified accuracy is 'defined' between 5% to 120% of rated current, whereas for 0.2 S the accuracy is provided between 1% to 120% of rated current. At these secondary current ranges, accuracy is applicable when the burden is between 25% to 100%.

what is the resistance value of our human body?

9 Answers  

---

how can we save enegry by using VFD for Resiprocating Air compressor which is having more unloading running hours

0 Answers   MRF,

---

why ht cable end termination don't have a gland?

0 Answers   Private,

---

What are your future expectations from this company and how long do you intend to work with this company if employed?

1 Answers  

---

what is the use of interposed & reverse voltage transformer

2 Answers   Anjani Steels,

---

---

A CT is marked as 10VA 0.2FS in its name plate. What is it? Where it is used?

1 Answers  

---

What is Automatic interlocking circuit dighram between two contactor for DG SET panel.

1 Answers  

---

in transformer input is d.c signal which type of emf is induced

1 Answers  

---

EXPLIAN THE IMPORTANCE OF POLY PHASE CIRCUIT.

0 Answers  

---

circuit breaker work alone during fault condition or need any relays ?

4 Answers  

---

whytransformers rating in KVA?

3 Answers   Chettinad,

---

100 MVA 3-phase alternator with earthed neutral has a reactance of 5 ohms per phase. what will be the fault MVA of generator.

0 Answers  

---