Broadband Related > Telephony Wiring + Equipment

Electric Fence REIN Troubleshooting

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aesmith:
Hi,

We've found the offending electric fence that BT weren't allowed to identify for us.  There's no doubt about it, even to the fact that their new mains powered energiser was installed in November, right when the problems started.  The lady was very helpful, wasn't aware that it interfered with broadband but now I mentioned it she said for the last month or so it's been really slow giving her problems with Facebook.  So perfectly open to working with us to see if we can resolve things.

The fence is a single strand of plastic line with steel conductors, run at chest height on stand off insulators on fence posts.  There are two gateways with expanding spring type openings.   Mains powered energiser in the stable, lead out cable from there underground and coming up at a gatepost in an adaptable box from which the fence conductor is connected.  Not sure what cable type is used for the underground run.   There's no phone line at the stable so the energiser and it's earth are around 200m from the telephone cable at the roadside.   The fence runs along the road for several hundred yard, above the 50 pair phone line.

First walk around there wasn't anything that glaring.  The fence tested full power at all points, and the earth rod gave no reading on the tester at all.  Nothing looked like it was shorting.  So all I have is points of possible concern.  (1) joints in the fence line made by knots rather than joiners.  One of those was clicking when I walked round so I've fixed that one (and that seems to have had some effect).  There are a few more that weren't showing any sign of problems (2) The earth rod isn't that long, in fact the guy who installed it had some concerns but hadn't fitted a longer one yet as it seems to work OK  (3) the gateways, one of which is directly over the phone cable.  These join with steel hooks with various degrees of rust.

Any ideas as to what sort of faults I should be looking for?  I must say that if my concern was only the effectiveness of the fence, I can't see anything that would worry me. 

The attached graph shows the general error rate, you can see three short periods when the fence was off, and what looks like a lower error rate after I fixed the clicking joint, not yet confirmed because I've seen short episodes like that before.   My thoughts at the moment are that if this continues, it might be worth going back and fixing all the knots in the same way whether clicking or not.

Thanks in advance, 

Tony S

burakkucat:
I think it would be well worthwhile to ensure that every joint in the "active" conductor is sound. Every arc that occurs will be acting as a 1900s era spark-transmitter.

A longer earth-rod may also help. (Just so long as it is not driven into the ground such that it penetrates the buried 50-pair cable.)

Overall, I think the biggest problem (once the above have been addressed) will be that the fence runs parallel to the 50-pair D-side cable and thus coupling between the two will occur.

tickmike:

--- Quote from: burakkucat on March 05, 2017, 06:33:08 PM ---I think it would be well worthwhile to ensure that every joint in the "active" conductor is sound. Every arc that occurs will be acting as a 1900s era spark-transmitter.
--- End quote ---

+1


--- Quote ---A longer earth-rod may also help. (Just so long as it is not driven into the ground such that it penetrates the buried 50-pair cable.)
--- End quote ---

Make sure it does not go through the Mains Cable also ! :'(


--- Quote ---Overall, I think the biggest problem (once the above have been addressed) will be that the fence runs parallel to the 50-pair D-side cable and thus coupling between the two will occur.

--- End quote ---
+1

She if the lady will let you get some stats from her Modem, it may help her as well and other people in the area to you can sort out the problem.

On my problem I had with a neighbors security camera giving out REIN I gently dropped the hint that BT now had the powers to disconnect the the offending persons broadband connection if it was not fixed, odd my REIN interference stopped the next day.  :lol:

aesmith:
Thinking this through I actually wonder if a better earth might make it worse.  The better the earth, the more energy goes to the fence.  Anything radiated from the earth rod itself has to travel a long way before it reached any telephone cable.

tickmike:
The problem is the fence wire is a very big aerial.  :o
Find out what make the controller is and send an email to the firm to see if they have any idea's to stop/reduce the radiated interference.

Knot info. http://www.agrisellex.co.uk/media//wire-join_detail.jpg

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