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3.2.6
Optical Fibres
WARNING!
Laser Radiation!
Do not look directly into the fibre-optic elements!
The transmission via fibre optics is particularly insensitive to electromagnetic interference and thus ensures gal-
vanic isolation of the connection. Transmit and receive connections are shown with the symbols for transmit
and for receive.
The normal setting of 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.
3.2.7
Checking the 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 functionality as per drawings, visual assessment of the pro-
tection system, and a simplified functional check of the protection device.
Auxiliary Power Supply
Before the device is connected to voltage for the first time, 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.
Visual Check
Check the cubicle and the devices for damage, condition of the connections etc., and device earthing.
Secondary Check
Testing the individual protection functions for the accuracy of their pickup values and characteristics proper
should not be part of this check. Unlike analog electronic or electromechanical protective devices, no protection
function test is required within the framework of the device test, since this is ensured by the factory tests. Pro-
tection functions are only used to check the device connections.
A plausibility check of the analog-digital converter with the operational measured values is sufficient since the
subsequent processing of the measured values is numerical and thus internal failures of protection functions
can be ruled out.
Where secondary tests are to be performed, a three-phase test equipment providing test currents and voltages
is recommended (e.g. Omicron CMC 56 for manual and automatic testing). The phase angle between currents
and voltages should be continuously controllable.
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
Mounting and Commissioning
3.2 Checking Connections
393
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