Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Current Transformer Identification

Status
Not open for further replies.
M

maxim10373

Advanced Member level 4
Joined
Feb 26, 2010
Messages
115
Helped
1
Reputation
2
Reaction score
2
Trophy points
1,298
Activity points
2,063
hi All

According to this diagram, what is the rating of the current transformer ?
This is a 1HP 3phase induction motor starter with over current protection circuit.


thanks
Maxim
 

Attachments

  • elecssr.jpg
    elecssr.jpg
    63.6 KB · Views: 77

Hi,

NOMINAL current specification usually is written on your motor. Or at least cos(phi).

Now you have to specify the OVERCURRENT condition.
This defines the current transformer rating.

Klaus
 
Current ratting not mentioned but we can calculate from motor power
For 1HP 3phase motor full load current for each phase should be 3.7A max

Full load current.png

So the CT should be above full load current, 10A CT should work
 
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top