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Technical Data
4.2 Protection Interfaces and Connections
03
04
05
06
PVC line NYY-J 16x1.5 insulation material, single wires not twisted
01
02
03
04
05
06
1)
A multi-wire cable of 1 km length was used to determine the maximum range. The cables were wound on
cable reels. The 1 km wires were connected in series to obtain the maximum length. Twisted pair cables
allow the use of several similar communication devices (e.g. 3 pairs of 7SD80) within one cable. You should
use twisted pair cables to minimize possible interference. Considerable restrictions may occur due to cross-
talk effects when using signal cables or underground cables (no telecommunication cables, e.g. auxiliary
protection cables with high capacitance per unit length) which are used by several communication devices.
The values determined here are examples. The actually possible range depends on the properties of the
cable, the number of joints and splices.
To select the modes of the Cu protection interface connection, please observe the following criteria:
The connection must be established in the selected mode.
The number of message errors (per minute and/or per hour) should be as small as possible (opera-
tional measured value).
Mode
01 and 02
03 and 04
05 and 06
(the signal noise ratio and the attenuation are operational measured values)
It can be possible to select several modes for a cable. Due the smaller disturbance sensitivity, modes 01 and
03 are recommended.
We recommend the following for the lines listed here as examples:
Line 1 (telephone line): Mode 03 (largest range 20 km)
Line 2 (signal line): Mode 06 (largest range 20 km for high transmission rates)
Line 3 (PVC line): Mode 03 (Range 16 km if SNR is good. The high attenuation is due to the range
here)
260
64
20
128
6
128
14
128
20
64
8
128
6
64
16
128
6
128
12
128
16
Signal noise ratio, S/N (the
higher this value the better)
≥ 12 db
≥ 6 db
≥ 6 db
23
20
10
30
18
16
23
9
14
11
14
30
24
19
11
30
18
13
24
8
Attenuation, D (the smaller this
value the better)
≤ 40 dB
≤ 40 dB
≤ 30 dB
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
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