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Categories >> Engineering >> Electrical Engineering

Questionwhat is the difference between 5P20 class CT , PS Class CT and 5P10 class CT?? Question Submitted By :: Tk_skr

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Re: what is the difference between 5P20 class CT , PS Class CT and 5P10 class CT??Answer

# 1CT'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.

4 Amit_er1981 [Garden]

Interview Transformer CT 5A

Interview CT 5A In CT

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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

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

0 Lim

Re: what is the difference between 5P20 class CT , PS Class CT and 5P10 class CT??Answer

# 3in 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

0 Veera

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In CT Used CT CT CT

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how to improve power factor correction? 3

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