1.3 Characteristics
25
7SD610 Manual
C53000-G1176-C145-4
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 program-
mable function keys on the front panel, via the system interface (e.g. by SICAM or
LSA), or via the operator interface (using a personal computer and the operating
software DIGSI)
• Feedback on switching states via the circuit breaker auxiliary contacts (for com-
mands with feedback)
• Plausibility monitoring of the circuit breaker position and monitoring of interlocking
conditions for switching operations
Monitoring
Functions
• Availability of the device is greatly increased because of self-monitoring of the inter-
nal 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 availability of transmission
telegrams
• Check of the consistency of protection settings at both line ends: no processor
system start-up with inconsistent 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"
Further Functions • Battery buffered real-time clock, which may be synchronized via a synchronization
signal (e.g. DCF77, IRIG B, GPS via satellite receiver), binary input or system inter-
face
• Automatic time synchronization between the devices at the ends of the protected
object via the protection data transmission
• Continuous calculation and display of measured quantities on the front of the
device. Indication of measured quantities of the remote end
• Fault event memory (trip log) for the last 8 network faults (faults in the power sys-
tem), with real time stamps
• Fault recording memory and data transfer for analog and user configurable binary
signal traces with a maximum time range of 15 s, synchronized between the
devices of the differential protection system
• Switching statistics: Counter with the trip commands issued by the device, as well
as record of the short-circuit current data and accumulation of the interrupted short-
circuit currents
• Communication with central control and data storage equipment via serial interfac-
es through the choice of RS232, RS485, modem, or optical fibres, as an option
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