Technical Data
4.2 Protection Interfaces and Connections
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
294
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
crosstalk effects when using signal cables or underground cables (no telecommunication cables, e.g. auxil-
iary protection cables with high capacitance per unit length) which are used by several communication de-
vices. The values determined here are examples. The actually possible range depends on the properties of
the cable, the number of joints and splices.
Electrical protection data interface:
Maximum distance 16 km (9.94 miles) (for AWG 19 / 0.65 mm
2
)
Maximum transmission rate 128 kbit/s
Telecommunication cable or communication cable twin-wire, e.g. A-2Y(L)2Y cable
Cable attenuation < 40 dB (for 80 kHz)
Ranges determined during tests
1)
Mode Transmission rate [kbit/s] maximum range [km] Attenuation [db] Signal noise ratio (SNR)
[db]
Telephone wire A-2Y(L)2Y 20x2x0.8 twisted, fully screened
01 64 20 42 12
02 128 18 42 11
03 64 20 39 7
04 128 20 42 6
05 128 16 33 9
06 128 14 28 6
Signal line A-2Y2YB2Y 20x1x1.4 PE insulation material, single wires not twisted, fully screened
01 64 6 10 36
02 128 6 13 21
03 64 20 23 20
04 128 6 10 30
05 128 14 18 16
06 128 20 23 9
PVC line NYY-J 16x1.5 PVC insulation material, single wires not twisted
01 64 8 14 11
02 128 6 14 30
03 64 16 24 19
04 128 6 11 30
05 128 12 18 13
06 128 16 24 8
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