Optical Fibres; Checking Device Connection - Siemens SIPROTEC 7VU681 User Manual

Table 3-18
Pin No.
1
2
3
4
5
6
7
8
9
1)
Assigned, but not used
3.2.5

Optical Fibres

WARNING!
Do not look directly into the fibre-optic elements!
The transmission via fibre optics is particularly insensitive to electromagnetic interference and thus ensures
galvanic isolation of the connection. Transmit and receive connections are shown with the symbols for transmit
and for receive.
The character idle state for the optical fibre interface is "Light off". If the character idle state is to be changed,
use the operating program DIGSI, as described in the SIPROTEC 4 System Description.
3.2.6

Checking Device Connection

General
By checking the device connections the correct installation of the protection device e.g. in the cubicle must be
tested and ensured. This includes wiring check and functionality as per drawings, visual assessment of the pro-
tection system, and a simplified functional check of the protection device.
Auxiliary Voltage Supply
Before the device is connected for the first time to voltage, it should be have been at least 2 hours in its oper-
ating room, in order to attain temperature equilibrium and to avoid dampness and condensation.
Note
If a redundant supply is used, there must be a permanent, i.e. uninterruptible connection between the minus
polarity connectors of system 1 and system 2 of the DC voltage supply (no switching device, no fuse), because
otherwise there is a risk of voltage doubling in case of a double earth fault.
Switch on the auxiliary voltage circuit breaker (supply protection), check voltage polarity and amplitude at the
device terminals or at the connection modules.
SIPROTEC, 7VU681, User Manual
C53000-G1176-C368-1, Release Date 07.2012
D-subminiature connector assignment of the time synchronization interface
Designation
P24_TSIG
P5_TSIG
M_TSIG
1)
M_TSYNC
Shield
–
P12_TSIG
1)
P_TSYNC
SHIELD
Mounting And Commissioning
Signal Meaning
Input 24 V
Input 5 V
Return Line
1)
Return Line
Shield Potential
–
Input 12 V
1)
Input 24 V
Shield Potential
3.2 Checking Connection
79