What's wrong with this picture?

[don_resqcapt19]

Was the person who made the termination qualified? That is did he get all of the semi-conductor insulation off of the dielectric insulation when he installed the stress cone?

 

[mbrooke]

Im guessing corona?

 

[JoeStillman]

Was the person who made the termination qualified? That is did he get all of the semi-conductor insulation off of the dielectric insulation when he installed the stress cone?

It was done so long ago that nobody even knows who built it.

I'm wondering if we ought to try and re-terminate it or replace the whole cable.

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[JoeStillman]

Im guessing corona?

Me too.


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[Smart $]

It was done so long ago that nobody even knows who built it.

I'm wondering if we ought to try and re-terminate it or replace the whole cable.

If it's not prohibitive to de-energize for a few hours, I'd have some new tape and cleaner handy, shut it down, remove discolored portions of tape, and assess... then clean and re-tape no matter the assessment, and re-energize.

 

[Sahib]

Check anti condensation heater inside panel enclosure. If defective, replace it.

 

[mbrooke]

Check anti condensation heater inside panel enclosure. If defective, replace it.

How would condensate cause this? :?

 

[Sahib]

The corona onset voltage decreases with increase in air humidity. An operating anti condensation heater would avoid it and so the damage shown in the photo of the OP.

 

[mbrooke]

The corona onset voltage decreases with increase in air humidity. An operating anti condensation heater would avoid it and so the damage shown in the photo of the OP.

Wouldnt stress cones do the same?

 

[Sahib]

Wouldnt stress cones do the same?

No because stress cones are a means of preventing insulation failure at the termination of a shielded cable caused by the high concentration of flux and the high potential gradient that would otherwise exist between the shield termination and the cable conductor.

 

[don_resqcapt19]

I have never seen any pictures of corona damage that looked like what is shown in this thread.

I still think that not all of the semiconductor was removed when the termination was made that the current flow through the remaining semiconductor caused the heat damage.

 

[JoeStillman]

Check anti condensation heater inside panel enclosure. If defective, replace it.

I can see how an anti-condensation heater could cause over-heating, say due to a thermostat with welded contacts.

 

[mbrooke]

Ok... I guess I might ask... what is the correct way to terminate cable like this? The ones I am familiar with involve stress cones or elbos.

 

[Sahib]

I can see how an anti-condensation heater could cause over-heating, say due to a thermostat with welded contacts.

Does it imply no working heater in your panel?

 

[Smart $]

I have never seen any pictures of corona damage that looked like what is shown in this thread.

Neither have I.

I think corona damage would appear more pitted.

 

[JoeStillman]

Ok... I guess I might ask... what is the correct way to terminate cable like this? The ones I am familiar with involve stress cones or elbos.

Here's how the other loop conductors are terminated at the opposite end of the gear.

 

[Cloud]

How long is the cable run between the two panels? Are the cables shielded / armored? Is it solidly bonded?

 

[mbrooke]

Here's how the other loop conductors are terminated at the opposite end of the gear.
View attachment 14842

That looks a LOT better