Insulated Caps

**lewy** · 07-06-2012, 04:12 PM

We put arrestors at all of our normal open points or on the other bushing if it is a radial. We have went to Elastimold vented inserts on all of our transformers, but we only had problems on our 27.6 when the temp got around freezing. All of our new trans have internal switches so it allows us not to have to operate a live elbow on these transformers.

**T-Man** · 07-06-2012, 10:00 PM

Dogman,

the utility I worked for, worked with Cooper power to come up with new enhanced elbows and caps. We were getting flashes switching on 24.9 in conditions below 30 degrees. We started heating the face of the transformers with portable torpedo heaters, We had a prescribed time to heat when the weather was below certian temps and to heat for certian times in each situation.

This worked pretty good. But it created a tremendous amount of switching time and outages were extended causing suffering to our customers.

The Enhanced elbows and caps fixed that and now the system has been almost completely changed out. The enhanced equipment has a yellow band and dot on the terminators and caps making them easy to recognize.

The control center has the locations of this equipment indicated on the map system so when switching is written up there is a good way to know about how long it will take to prep an outage and clearance.

Call Cooper power and ask to talk to whoever is incharge of URD equipment they will help you out.

Here is the info they are called Posi-break terminators.

http://www.cooperindustries.com/cont...ptionalin.html

**reppy007** · 07-07-2012, 12:31 AM

Originally Posted by Pootnaigle

Ummmmmmmmmm think about the last transformer on a lateral.... One bushing has the elbow the other has the dust cover.

Ok,a dummy plug,thats what we call them.....hmm

**lewy** · 07-07-2012, 06:46 AM

Originally Posted by T-Man

Dogman,

the utility I worked for, worked with Cooper power to come up with new enhanced elbows and caps. We were getting flashes switching on 24.9 in conditions below 30 degrees. We started heating the face of the transformers with portable torpedo heaters, We had a prescribed time to heat when the weather was below certian temps and to heat for certian times in each situation.

This worked pretty good. But it created a tremendous amount of switching time and outages were extended causing suffering to our customers.

The Enhanced elbows and caps fixed that and now the system has been almost completely changed out. The enhanced equipment has a yellow band and dot on the terminators and caps making them easy to recognize.

The control center has the locations of this equipment indicated on the map system so when switching is written up there is a good way to know about how long it will take to prep an outage and clearance.

Call Cooper power and ask to talk to whoever is incharge of URD equipment they will help you out.

Here is the info they are called Posi-break terminators.

http://www.cooperindustries.com/cont...ptionalin.html

We use vented inserts & we also have a program to change them all out, we have had no problems on the ones that have been changed & they are also I.D. In system. If we have switching when it is cold that involves the non vented we will just go back to the first available vented insert or to the riser & have a very brief outage in order to operate the elbow isolated.

**birdog37** · 07-08-2012, 11:36 AM

The other your saying really should be an arr ester @ the end of a lateral.A...........

**lewy** · 07-08-2012, 11:46 AM

Originally Posted by birdog37

The other your saying really should be an arr ester @ the end of a lateral.A...........

Yea we put an elbow arrestors on the one insert & have a parking stand arrestors for the other live elbow to be parked on at our open points.

**bluestreak** · 07-08-2012, 05:04 PM

We started putting elbow arrestors on all new installations,then even started to retrofit the older stuff as it came up on it's five year inspection cycle. We had questions that never got answered, what happens when you blow the ground end of the arrestor off, you come along and throw a test it looks clear, re-energize and go about your merry way meanwhile you have 13.2 on the end of the arrestor. Tried to have the Co. map the arrestors and make it a procedure to check them after an outage but you know that takes time and time is money and safety is just for show. Just another reason to wear all your PPE just doing the simple stuff.

**Lineman North Florida** · 07-08-2012, 09:21 PM

Originally Posted by bluestreak

We started putting elbow arrestors on all new installations,then even started to retrofit the older stuff as it came up on it's five year inspection cycle. We had questions that never got answered, what happens when you blow the ground end of the arrestor off, you come along and throw a test it looks clear, re-energize and go about your merry way meanwhile you have 13.2 on the end of the arrestor. Tried to have the Co. map the arrestors and make it a procedure to check them after an outage but you know that takes time and time is money and safety is just for show. Just another reason to wear all your PPE just doing the simple stuff.

We have been putting these URD arrestors in for about 18 years and in all that time I have only seen 1 blown, after any given thunderstorm you will find plenty OH arrestors blown but not the one's in the URD transformer's, we have changed a few out that showed hot when we shot them with an IR camera, but they were'nt blown, the one's we get either work really well or not at all.

**reppy007** · 07-08-2012, 09:46 PM

Originally Posted by Lineman North Florida

We have been putting these URD arrestors in for about 18 years and in all that time I have only seen 1 blown, after any given thunderstorm you will find plenty OH arrestors blown but not the one's in the URD transformer's, we have changed a few out that showed hot when we shot them with an IR camera, but they were'nt blown, the one's we get either work really well or not at all.

From what Ive seen the urd arrestors have failed mostly in the early mornings,the elbow types of arrestors seem to fail when its very foggy thats on 19.9,here you dont see 12 kv elbow arrestors.Some of our 19.9 loops dont have the elbow arrestors either,they are only located at the terminal poles.The only 12 kv arrestors on a loop are the old cabinet type of transformers,actually a livefront with the porcelain arrestors

**Street Lighter** · 07-10-2012, 11:00 AM

I have to say that in my career I've not heard of this . Granted our distribution is mostly 48/7200 with 14.4 in outlying areas . Not knowing , I wonder if the insert bushings are part of the problem . We stock a short and extended single bushing rated at 25/28k. The latter normally being used to gain a couple inches clearance from the secondary paddles . Just wandering that the extended one would help prevent the problem .also assuming that the bleed wire is intact

Insulated Caps

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