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Commissioning;
• Display of magnitude and phase angle of local and remote measured values
Operation;
• Indication of the calculated differential and restraint currents
Maintenance
• Display of measured values of the communication link, such as transmission delay
Command
• Switchgear can be switched on and off manually via local control keys, the program-
Processing
• Feedback on switching states via the circuit breaker auxiliary contacts (for com-
• Plausibility monitoring of the circuit breaker position and monitoring of interlocking
Monitoring
• Availability of the device is greatly increased because of self-monitoring of the inter-
Functions
• Monitoring of the current and voltage transformer secondary circuits by means of
• Monitoring of communication with statistics showing the availability of transmission
• Check of the consistency of protection settings at both line ends: no processor
• 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
• Supervision of measuring voltage failure using "Fuse Failure Monitor"
Further Functions
• Battery buffered real-time clock, which may be synchronized via a synchronization
• Automatic time synchronization between the devices at the ends of the protected
• Continuous calculation and display of measured quantities on the front of the
• Fault event memory (trip log) for the last 8 network faults (faults in the power sys-
• Fault recording memory and data transfer for analog and user configurable binary
• Switching statistics: Counter with the trip commands issued by the device, as well
• Communication with central control and data storage equipment via serial interfac-
7SD610 Manual
C53000-G1176-C145-4
and availability
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)
mands with feedback)
conditions for switching operations
nal measurement circuits, power supply, hardware and software
summation and symmetry checks
telegrams
system start-up with inconsistent settings which could lead to a malfunction of the
differential protection system
blocking of the differential protection system in order to avoid malfunction
signal (e.g. DCF77, IRIG B, GPS via satellite receiver), binary input or system inter-
face
object via the protection data transmission
device. Indication of measured quantities of the remote end
tem), with real time stamps
signal traces with a maximum time range of 15 s, synchronized between the
devices of the differential protection system
as record of the short-circuit current data and accumulation of the interrupted short-
circuit currents
es through the choice of RS232, RS485, modem, or optical fibres, as an option
1.3 Characteristics
25
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