Siemens SIPROTEC 7SD610 Manual page 27

Commissioning; Operation; Maintenance
• Display of magnitude and phase angle of local and remote measured values
• Indication of the calculated differential and restraint currents
• Display of measured values of the communication link, such as transmission delay and availability
Command Processing
• Switchgear can be switched on and off manually via local control keys, the programmable function keys on
the front panel, via the system interface (e.g. by SICAM or LSA), or via the operator interface (using a per-
sonal computer and the operating software DIGSI)
• Feedback on switching states via the circuit breaker auxiliary contacts (for commands with feedback)
• Monitoring of the circuit breaker position and of the interlocking conditions for switching operations.
Monitoring Functions
• Availability of the device is greatly increased because of self-monitoring of the internal measurement circuits,
power supply, hardware and software
• Monitoring of the current and voltage transformer secondary circuits by means of summation and symmetry
checks
• Monitoring of communication with statistics showing the number of faulty transmission telegrams.
• Check of the consistency of protection settings at both line ends: no processor system start-up with incon-
sistent settings which could lead to a malfunction of the differential protection system
• Trip circuit supervision
• Check of local and remote measured values and comparison of both
• Broken wire supervision for the secondary CT circuits with fast phase-segregated blocking of the differential
protection system in order to avoid malfunction.
• Supervision of measuring voltage failure using "Fuse Failure Monitor"
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
Introduction
1.3 Characteristics
27