Ask Experts Questions for FREE Help !
Ask

How to calculate the short time current rating for current transformer?

Asked Nov 2, 2009, 07:13 AM — 3 Answers
Respected sir's,

please clear my doubts?
how to calculate the "short time current rating"(i.e-primary short time current rating-like if you take 400-400/5-15va/class1,40ka/3sec).


40ka/3sec-how to calculate this rating from the substation?
Is there any formula?please advise me.............

I am waiting for your's reply...


Thanks&regards,
Pandees.b

Search this Thread
Share |
3 Answers
anasmemon's Avatar
anasmemon Posts: 3, Reputation: 10
Junior Member
  
#2

Mar 10, 2011, 12:43 AM
Short time rating is defined by your MVA rating. Suppose you are using 0.8MVA transformer at 33/11KV, so your STC will be 0.8*1000/(1.73*11)=42KA.

I hope this will help you. So to calculate STC the data you have given is not useful..but system parameters are required.
Helpful
kkspwr's Avatar
kkspwr Posts: 1, Reputation: 1
New Member
  
#3

Jul 16, 2012, 11:00 PM
how much will be 6.6 /.4 kv transformer be equivalent in KVA
Helpful
tkrussell's Avatar
tkrussell Posts: 9,673, Reputation: 3698
Senior Electrical & Lighting Expert
  
#4

Jul 17, 2012, 04:50 AM


Not enough information provided, assuming you mean the primary is 6.6kV and the secondaray is .4 kV.

Quote:
Originally Posted by kkspwr View Post
how much will be 6.6 /.4 kv transformer be equivalent in KVA
Helpful
Not your question? Ask your question View similar questions
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Add your answer here.

Remove Text Formatting
 

Undo
Redo
  
Decrease Size
Increase Size
Bold
Italic
Underline
Align Left
Align Center
Align Right
Ordered List
Unordered List
Decrease Indent
Increase Indent
Insert Email Link
Wrap [QUOTE] tags around selected text
Wrap [CODE] tags around selected text
Wrap [HTML] tags around selected text
Wrap [PHP] tags around selected text
Wrap [YOUTUBE] tags around selected text
Notification Type:



Check out some similar questions!

Transformer current [ 2 Answers ]

What is the current rating of 100 KVA distribution transformer with ratings as V = 11KV/0.4KV f = 50Hz

How to calculate the short circuit current flow in a three phase circut [ 3 Answers ]

How to calculate the short circuit current flow in a three phase circut?

100/5 current rating on Current Transfomer [ 4 Answers ]

What is meaning of current rating 100/5 printed on CT?/

Current transformer - short time withstand current [ 4 Answers ]

Hi, For ring-type (window-type) CT, do we need to size the CT short time withstand current at the same or above the system short time withstand current (short circuit level)? Any reference/technical explanation? Thanks!

View more Electrical Engineering questions Search