Technical Data
4.2 Protection Data Interfaces and differential protection topology
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
584
4.2
Protection Data Interfaces and differential protection topology
Differential Protection Topology
1)
7SD5*2 as device with one protection data interface for true two-end operation or for chain operation at the ends of a
multi-end configuration
2)
7SD5*2 as device with two data protection interfaces for redundant two-end operation
3)
7SD5*3 as device with two data protection interfaces for chain and ring operation of a multi-end configuration
Protection Data Interfaces
1)
Numeric opening (NA = sin
φ
(coupling angle)
Number of devices for one protected object
(=number of ends delimited by the current transformer)
2 to 6 for 7SD5*2/7SD5*3
Number
1 or 2
Connection optical fibre
Mounting location „D“ for one connection or „D“ and „E“
for two connections
For flush-mounting housing
On the rear side
For panel surface-mounting housing
In console housing at device bottom
Connection modules for protection data interface, depending on the ordering version:
FO5
FO30 (IEEE C37.94)
Distance, maximum
1.5 km or 0.9 miles
Connector Type
ST connector
Optical wavelength
λ
= 820 nm
Fibre Type
Multimode 62.5
μ
m/125
μ
m
Transmit output (peak)
Min.
Type
max.
50
μ
m /125
μ
m, NA = 0.2
62.5
μ
m /125
μ
m, NA = 0.275
-19.8 dBm
-16.0 dBm
-15.8 dBm
-12.0 dBm
-12.8 dBm
-9.0 dBm
Receiver sensitivity (peak)
– Optical power for high level
– Optical power for low level
Max. -40 dBm
Min. -24 dBm
Optical budget
min. 4.2 dB for 50
μ
m /125
μ
m, NA = 0.2
min. 8 dB for 62.5
μ
m /125
μ
m, NA = 0.275
Laser class 1 according to EN 60825-1/-2
Using glass fibre 62.5
μ
m /125
μ
m and 50
μ
m /125
μ
m
Reach
for multimode optical fibre, an optical signal attenuation of 3
dB/km is used for calculating light with a wavelength of
λ
= 820
nm
Attenuators required
no
