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Author Topic: Cows out again  (Read 2391 times)

aesmith

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Re: Cows out again
« Reply #15 on: June 04, 2019, 10:04:05 AM »

How's "your" fence constructed.   "My" fence is plastic rope with from memory one pair of metal strands in each strand of the rope, making 6 wire conductors in total.   The work I did at that time was at a joint where the rope was knotted and the wire not making proper contact, given an audible click.  Based on the initial improvement I was all set to go round the whole perimeter remaking all the joins.   
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noddy

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Re: Cows out again
« Reply #16 on: June 04, 2019, 10:19:16 AM »

How's "your" fence constructed.   "My" fence is plastic rope with from memory one pair of metal strands in each strand of the rope, making 6 wire conductors in total.   The work I did at that time was at a joint where the rope was knotted and the wire not making proper contact, given an audible click.  Based on the initial improvement I was all set to go round the whole perimeter remaking all the joins.
the fence is a wooden posts multi strand barbed wire with a galvanised live running on the top . I would guess it's total run is about 3 miles but that is a total guess
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noddy

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Re: Cows out again
« Reply #17 on: June 05, 2019, 07:12:39 AM »

this is looking like a daily ritual  ??? todays re-sync 6.36
 adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 8000
Max:    Upstream rate = 823 Kbps, Downstream rate = 4888 Kbps
Path:   0, Upstream rate = 829 Kbps, Downstream rate = 3067 Kbps

Link Power State:       L0
Mode:                   ADSL2
TPS-TC:                 ATM Mode
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        6.2             5.7
Attn(dB):        57.5            37.0
Pwr(dBm):        19.1            12.6
                        ADSL2 framing
MSGc:           95              12
B:              30              94
M:              1               1
T:              2               1
R:              12              16
S:              0.3182          3.6244
L:              1081            245
D:              96              8
                        Counters
SF:             121206          119387
SFErr:          2               0
RS:             24483620                2147579
RSCorr:         1377728         14667
RSUnCorr:       2               0

HEC:            1               0
OCD:            0               0
LCD:            0               0
Total Cells:    14090433                3806753
Data Cells:     659749          158325
Drop Cells:     0
Bit Errors:     0               0

ES:             5167            275
SES:            27              0
UAS:            114             114
AS:             1948

INP:            4.26            2.08
PER:            16.07           16.31
delay:          7.63            7.24
OR:             50.27           8.82

Bitswap:        244             20

Total time = 1 days 4 min 16 sec
FEC:            14916243                3667504
CRC:            7758            390
ES:             5167            275
SES:            27              0
UAS:            114             114
LOS:            3               0
LOF:            27              0
Latest 15 minutes time = 4 min 16 sec
FEC:            172396          1954
CRC:            1               0
ES:             1               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
Previous 15 minutes time = 15 min 0 sec
FEC:            592452          6849
CRC:            1               0
ES:             1               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
Latest 1 day time = 4 min 16 sec
FEC:            172396          1954
CRC:            1               0
ES:             1               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
Previous 1 day time = 24 hours 0 sec
FEC:            2203303         566479
CRC:            1901            40
ES:             1173            26
SES:            9               0
UAS:            29              29
LOS:            1               0
LOF:            9               0
Since Link time = 32 min 27 sec
FEC:            1377728         14667
CRC:            2               0
ES:             2               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
>
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aesmith

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Re: Cows out again
« Reply #18 on: June 05, 2019, 12:46:04 PM »

Am I missing something, because do me those stats don't look bad.   Only two ES in the last 32 minutes, and last 24 hour MTBE of 73.   Apart from the re-synch what is the actual impact on your service?
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noddy

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Re: Cows out again
« Reply #19 on: June 05, 2019, 02:31:35 PM »

Am I missing something, because do me those stats don't look bad.   Only two ES in the last 32 minutes, and last 24 hour MTBE of 73.   Apart from the re-synch what is the actual impact on your service?
thats the strange thing it's has been bad then then started this almost daily re-sync that seems stable then between 6.30 to 7 each morning re-syncs again ?
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IanG

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Re: Cows out again
« Reply #20 on: June 19, 2019, 10:55:19 PM »

The link below is an interesting thesis on electric fence faults.

https://mro.massey.ac.nz/bitstream/handle/10179/1161/02whole.pdf

I was particularly impressed by the attached Figure 3-3, showing how a damaged insulator can create excessive RFI. It's the sort of effect that might clear and reappear depending on the weather.

An electric fence circuit is similar to a car ignition coil, except that the object is to generate a high voltage spike without it sparking over. Since the fence will act as a lossy transmission line, the waveform at the far end of a long fence will have fewer high frequency components than at the near end, and will also generate a smaller magnetic field from the loop current. Depends on the length of the fence, of course. But if there is a choice, place the exciter as far away as possible.

As regards the idea of adding a loading capacitor on the output of the generator, an alternative is to add a series resistor. Both of these will slow the waveform on the fence, reducing the high frequency spectrum.  I suggest components rated for at least 10 kV, or 20 kV as aesmith suggests, and have them sealed in a way that prevents moisture getting at them, as they will be rated for dry conditions.

To find optimum component values, you may need to measure waveforms. In section 4.2 of the thesis, the author describes ways of sensing the pulse voltage, but misses the simplest one, which is to use a capacitive divider, as there is no need for a response to D.C.
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meritez

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Re: Cows out again
« Reply #21 on: June 20, 2019, 07:45:49 AM »

thats the strange thing it's has been bad then then started this almost daily re-sync that seems stable then between 6.30 to 7 each morning re-syncs again ?

is that the daily time frame the live wire on the fence is tested to check it is still working by sending voltage down the wire, similar to the way a TAM test is run?
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Weaver

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Re: Cows out again
« Reply #22 on: June 20, 2019, 10:50:44 AM »

That is a nice graph Ian am just about to read that thesis, thanks for that much appreciated. (Even though I think that luckily I am completely ok, especially seeing as my missus said when I asked her ‘Well I absolutely never ever turn it on any more’.

I learned that the fence is not even turned in because our donkeys just believe in the evil power of the fence, especially seeing as it has a little bit of white tape stuck to the wire, which flaps around in the breeze. This alone is enough. They’ve been stung in the past, that’s enough.
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