optically connected to the relays using short optical single-
mode cables. Using 0.8 mm
2
twisted pair cables, pilot wire link
distances up to 8 km are typically supported. However, twisted
pair pilot wire cables in good conditions may support even
longer distances to be covered. The length of the supported
pilot wire link also depends on the noise environment in the
installation. Should the need arise to replace the pilot wire
cables with fiber optic cables, the single-mode fiber optic LC
connectors of the relays can be used for direct connection of
the fiber optic communication link.
The protection communication supervision continuously
monitors the protection communication link. The line differential
protection function can be blocked if severe interference in the
communication link, risking the correct operation of the
function, is detected. If the interference persists, an alarm
signal is triggered indicating permanent failure in the protection
communication.
Protection communication and supervision
Binary signal transfer
Fiber-optic line differential communication link
GUID-5735D9CC-B1D2-4D73-85C2-1389ED25563B V1 EN
Figure 20.
Fiber-optic communication link
Pilot wire line differential
communication link
Protection communication and supervision
Binary signal transfer
RPW600
modem
RPW600
modem
Pilot wire line differential
communication link
Protection communication and supervision
Binary signal transfer
RPW600
modem
RPW600
modem
GUID-9A404E8B-1120-42B4-B72E-8EEFC15E4960 V1 EN
Figure 21.
Pilot wire protection communication link
1MRS759144 A
REX640
Product version: 1
ABB
27
Summary of Contents for RELION REX640
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