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hrk
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CT Burst in 110 KV Switch Yard

09/22/2015 12:30 AM

Can members enlighten the reasons for CT burst in the 110 KV switch yard?
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jack of all trades
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#1

Re: CT burst in 110 KV switch yard

09/22/2015 12:36 AM

Possibly lightning. Possibly lack of maintenance.

Can you supply any further information and photos?

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lyn
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#2

Re: CT burst in 110 KV switch yard

09/22/2015 12:52 AM

Operator incompetence comes to mind.

Was it an arc flash?

Were you injured?
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spades
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#3

Re: CT burst in 110 KV switch yard

09/22/2015 3:33 AM

Did you maybe open circuit the secondary?
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V.I.Abraham
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#4

Re: CT burst in 110 KV switch yard

09/22/2015 5:24 AM

Normally an open circuit CT is the reason for the burst . An insulation failure due possible high voltage in open circuit CT .
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Original_Macgyver
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#5

Re: CT Burst in 110 KV Switch Yard

09/22/2015 9:58 AM

Incompetence!?!?

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SHOCKHISCAN
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#6

Re: CT Burst in 110 KV Switch Yard

09/22/2015 10:18 AM

Most likely due to inadvertent open circuiting of the CT secondary.

Possible causes:

Loose connection(s) in CT secondary circuit at CT, CT circuit terminal strip(s), and/or metering Test Switch.

Incorrect troubleshooting or installation method by inexperienced technician/person.

Bad/failed ammeter switch contacts.

Bad/failed meter.

Loose screw(s) in/on terminal strip(s) in CT secondary circuit.

Incorrect wiring in CT and/or metering circuit.

Poor crimp and/or failure of wire terminal.

End of CT winding insulation life. (Not likely but possible.)

BE CAREFUL!! OPEN CIRCUITING ANY CT CIRCUIT WHEN ENERGIZED CAN BE FATAL!

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Crabtree
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#7

Re: CT Burst in 110 KV Switch Yard

09/22/2015 10:54 AM

It was probably because either the current through it or the voltage it experienced was more than it could withstand, Mildred.

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Unredundant
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#8

Re: CT Burst in 110 KV Switch Yard

09/22/2015 1:31 PM

Monkeys, with no chance of being chastised, may have chewed through the CT circuit.

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pnaban
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#9

Re: CT Burst in 110 KV Switch Yard

09/22/2015 10:45 PM

Is it oil-filled type.

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IdeaSmith
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#10

Re: CT Burst in 110 KV Switch Yard

09/22/2015 11:56 PM

"Enlighten" is a good one!

Tell us what your findings are please!

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hrk
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#11
In reply to #10

Re: CT Burst in 110 KV Switch Yard

09/23/2015 1:42 AM

received message from a friend for probable causes?

no much of data is available with him
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Crabtree
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#12
In reply to #11

Re: CT Burst in 110 KV Switch Yard

09/23/2015 8:13 AM

The only one who can see the bloody thing and who can find out what happened is you, Matey!

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adreasler
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#13

Re: CT Burst in 110 KV Switch Yard

09/23/2015 9:29 AM

Can hrk provide additional information?

  • Weather conditions at approximate time of burst?
  • Electrical load at time of burst?
  • Scheduled/unscheduled maintenance going on a time of burst?
  • Photographs of burst CT?
  • Stated rating of burst CT?

With so little information in the original post, all that can be supplied is extremely general information, and sarcasm. Sarcasm is always supplied free of charge, so do not be shy about asking for a second serving if desired.

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IdeaSmith
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#15
In reply to #13

Re: CT Burst in 110 KV Switch Yard

09/23/2015 10:54 PM

hrk is in the middle as it seems.

A friend had this problem but there is not much information.

I guess its an urban story!

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hrk
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#16
In reply to #15

Re: CT Burst in 110 KV Switch Yard

09/25/2015 7:56 AM

need not build any story Asked for more info when i get it i will post
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Original_Macgyver
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#14

Re: CT Burst in 110 KV Switch Yard

09/23/2015 5:14 PM
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16 comments

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Users who posted comments:

adreasler (1); Crabtree (2); hrk (2); IdeaSmith (2); jack of all trades (1); lyn (1); Original_Macgyver (2); pnaban (1); SHOCKHISCAN (1); spades (1); Unredundant (1); V.I.Abraham (1)

Previous in Forum: Single Phase to Three Phase Supply (Domestic)   Next in Forum: Selecting Cable Size for 2MVA Transformer

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