3.2 Checking Connections
257
7UM61 Manual
C53000-G1176-C127-3
Optical Fibers
WARNING!
Warning of Laser rays!
Non-observance of the following measures can result in death, personal injury or sub-
stantial property damage.
Do not look directly into the fiber-optic elements!
Signals transmitted via optical fibers are unaffected by interference. The fibers guar-
antee electrical isolation between the connections. Transmit and receive connections
are represented by symbols.
The character idle state for the optical fiber interface is “Light off.”. If the character idle
state is to be changed, use the operating program DIGSI, as described in the SIPRO-
TEC
®
4 System Description.
3.2.2
Checking Device Connections
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 func-
tionality as per drawings, visual assessment of the protection 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 operating 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 connec-
tion 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 polar-
ity and amplitude at the device terminals or at the connection modules.
Visual Check
Check of the cubicle and the devices for damage, quality of connections etc., and
earthing of devices.
Secondary Check
The check of the individual protection functions with regard to accuracy of pickup
values and the characteristic itself should not be part of this check. In contrast to
analog electronic or electromechanical protection, is not necessary to carry out this
protection function check for the purpose of checking the device itself, since this is
done by the works check. The protection function serves only to check the device con-
nection.
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