Siemens SIPROTEC 7SS523 V3.2 Manual page 316

Maintenance and Repair
8.4.3 Startup with a Defective Bay Unit / Defective Fiber-Optic Cable
300
The protection system can be started up even if a bay has failed (defective bay unit or
defective fiber-optic cable).
The system first starts up, and the whole protection is blocked. This happens
regardless of the setting of parameter BLOCKING MODE (6305/CU).
The faulty bay is shown in a separate alarm list which can be called up by pressing the
function key F1 on the central unit.
To be able to go on operating the substation until the defective bay unit or fiber-optic
cable has been replaced, proceed as follows:
Set the parameter Status (XX12/CU) to out of service.
Note
The faulty bay must first be excluded from the protection zone by isolating it in the
primary system.
7SS52 V4 Manual
C53000-G1176-C182-1