Table of Contents
Advertisement
Introduction
1.3 Characteristics
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
• Increase of the availability of the device by monitoring of the internal measurement circuits, auxiliary power
supply, hardware, and software
• Current transformer and voltage transformer secondary circuits are monitored using summation and sym-
metry check techniques
• Monitoring of communication with statistics showing the number of faulty transmission telegrams
• Check of the consistency of protection settings at all line ends: blocking of the differential protection system
in case of inconsistent settings which could lead to a malfunction
• Trip circuit supervision possible
• 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 line pro-
tection system in order to avoid malfunction
• Supervision of measuring voltage failure using "Fuse Failure Monitor"
Additional 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 interface
• Automatic time synchronization between the devices at the ends of the protected object via the protection
data transmission
• Continuous calculation and display of operational measured values on the front of the device. Display of
measured values of the remote end or of all ends
• Indication memory for the last 8 network faults (faults in the power system), with real time stamps (1 ms res-
olution)
• Fault recording and transmission of the data for fault recording for a maximum time range of approximately
30 s, synchronised between the devices of a line protection system
• Switching statistics: Counting of the trip and close commands issued by the device, as well as recording of
the fault current data and accumulation of the interrupted fault currents
• Communication with central control and memory components possible via serial interfaces (depending on
order variant), optionally via RS232, RS485, modem or fibre-optic cable
• Commissioning aids such as connection and direction checks and circuit breaker test functions
• Comprehensive support when checking and commissioning from PC or laptop by means of „WEB Monitor":
The communication topology of the line protection and communication system, phasor diagrams of all cur-
rents and (if applicable) voltages at all ends of the line protection system, as well as the differential protection
and distance protection characteristics, are graphically displayed on the screen
■
34
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
Advertisement
Table of Contents
