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Question
what is the difference between 5P20 class CT , PS Class CT 
and 5P10 class CT??
 Question Submitted By :: Tk_skr
I also faced this Question!!     Rank Answer Posted By  
 
  Re: what is the difference between 5P20 class CT , PS Class CT and 5P10 class CT??
Answer
# 1
CT's are categorized as Protection CT, Special Protection
CT and Measuring CT. Based on this, the CT's are
classified. Here is the meaning of the CT classes:

Class 5P20:

The letter 'P' indicates it is a protection CT.

The number 5 indicates the accuracy of the CT. Most common
accuracy numbers are 5 and 10.

The number 20 (called accuracy limit factor) indicates that
the CT will sense the current with the specified accuracy
even with 20 times of its secondary current flows in the
secondary. This is required for protection CT, because the
fault current is high and the CT should be able to sense
the high fault current accurately to protect the system.
The common numbers are 10, 15, 20 and 30.

Class PS:

PS is for 'Protection Special'. This class of CT's are used
for special protection such as differential protection,
distance protection etc.

Class 1M:

The letter 'M' indicates it is a measuring CT.

The number 1 indicated the accuracy of the CT. The
measuring CT's should be more accurate than the protection
CT. The most common accuracy numbers are 0.5 and 1.

Measuring CT's are intended to work in normal and it
doesn't require working with accuracy beyond the CT
secondary current rating, so the accuracy limit factor is
not mentioned here.
 
Is This Answer Correct ?    141 Yes 6 No
Amit_er1981
[Garden]
 
  Re: what is the difference between 5P20 class CT , PS Class CT and 5P10 class CT??
Answer
# 2
PS the first time i know.

may be no 1 is 1% tolerence accuracy

i take the knowledge only.
 
Is This Answer Correct ?    7 Yes 33 No
Lim
 
 
 
  Re: what is the difference between 5P20 class CT , PS Class CT and 5P10 class CT??
Answer
# 3
in 5p20 5 is 5% of the 20times of the primary current(i.e)
in case 100/1A CT 20*100=2000A 5% is 100A ERROR AT 2000A
fault cuurent for instantaneous trip this error is
negligible
 
Is This Answer Correct ?    15 Yes 3 No
Veera
 

 
 
 
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