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CT are in open condition

Created by: Chetan2490 at: 5/27/2014 1:33 PM (6 Replies)

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5/27/2014 1:33 PM
Chetan2490 Advanced Member Joined: 5/12/2014 Last visit: 9/9/2020 Posts: 149 Rating: (16)	Dear Experts, how long will take to burst/damage for a CT when secondary in open condition? Experienced: During switchgear testing(Primary current injection test) some of the CT are in open condition, but nothing happen's why?

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5/27/2014 2:55 PM	Rate (1)
Ste39 Platinum Member Joined: 1/21/2013 Last visit: 10/23/2024 Posts: 4620 Rating: (708)	Chetan2490 Dear Experts, how long will take to burst/damage for a CT when secondary in open condition? Hello Chetan2490, The current transformer when the secondary is open, it may present a very high voltage in the secondary as a whole becomes the primary magnetizing current. The magnetic core then enters into saturation induction values significantly higher than those of the project (0.5-0.8 tesla), which leads to unacceptable losses in the iron that lead to overheating of the TA and to damage to the insulation of the windings.

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5/27/2014 4:33 PM	Rate (0)
metwally mustafa Silver Member Joined: 10/10/2010 Last visit: 10/25/2024 Posts: 307 Rating: (15)	the secondary of CT should be short circuit while no load the protect it from damage as the iron loss and core loss will be infinite

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5/27/2014 7:01 PM
@nkur Posts: 202 Rating: (16)	Chetan2490 Dear Experts, how long will take to burst/damage for a CT when secondary in open condition? Experienced: During switchgear testing(Primary current injection test) some of the CT are in open condition, but nothing happen's why? Hi There It all depends on the type of CT ,Ct ratio ,CT ratings if you provide the same it would be easy.
@nkur Posts: 202 Rating: (16)
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5/28/2014 6:56 AM
jeet2907 Posts: 235 Rating: (52)	Chetan2490 Dear Experts, how long will take to burst/damage for a CT when secondary in open condition? Experienced: During switchgear testing(Primary current injection test) some of the CT are in open condition, but nothing happen's why? Dear Chetan First of all thanx for youe question.On the behalf of your question i will try to found for the same and i got this LINK which is realy provide outstanding infirmation for the same.Hope you will like it.
jeet2907 Posts: 235 Rating: (52)
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5/28/2014 7:49 AM
KALPESH PARMAR Posts: 14 Rating: (0)	Chetan2490 Dear Experts, how long will take to burst/damage for a CT when secondary in open condition? Experienced: During switchgear testing(Primary current injection test) some of the CT are in open condition, but nothing happen's why? Dear chetan, Depends on the type of CT ,Ct ratio ,CT ratings if you provide the same it would be easy. Regards, Kalpesh Parmar
KALPESH PARMAR Posts: 14 Rating: (0)
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5/28/2014 8:12 AM
Chetan2490 Advanced Member Joined: 5/12/2014 Last visit: 9/9/2020 Posts: 149 Rating: (16)	jeet2907 Chetan2490 Dear Experts, how long will take to burst/damage for a CT when secondary in open condition? Experienced: During switchgear testing(Primary current injection test) some of the CT are in open condition, but nothing happen's why? Dear Chetan First of all thanx for youe question.On the behalf of your question i will try to found for the same and i got this LINK which is realy provide outstanding infirmation for the same.Hope you will like it. Excellent Jeet

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