Siemens SIPROTEC 7SA522 Manual page 29

User-defined Func-
tions
Commissioning;
Operation (only
with digital trans-
mission of protec-
tion data)
Command Process-
ing
Monitoring Func-
tions
Additional Func-
tions
7SA522 Manual
C53000-G1176-C155-3
• Short dropout and overshoot times
• Freely programmable combination of internal and external signals for the imple-
mentation of user-defined logic functions;
• All common logic functions
• Time delays and set point interrogation
• Display of magnitude and phase angle of local and remote measured values
• Display of measured values of the communication link, such as runtime and avail-
ability
• Switchgears can be energized and de-energized 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 operating 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
• Availability of the device is greatly increased by monitoring of the internal measure-
ment circuits, auxiliary power supply, hardware, and software
• Current transformer and voltage transformer secondary circuits are monitored
using summation and symmetry check techniques
• Trip circuit supervision
• Checking for the load impedance, the measured direction and the phase sequence
• Monitoring the signal transmission of the optional digital communication path
• Battery buffered real time clock, which may be synchronized via a synchronization
signal (e.g. DCF77, IRIG B via satellite receiver), binary input or system interface
• Continuous calculation and display of measured quantities on the front display. In-
dication of measured values of the remote end or of all ends (for devices with pro-
tection data interfaces);
• Fault event memory (trip log) for the last 8 network faults (faults in the power sys-
tem), with real time stamps
• Fault recording and data transfer for fault recording for a maximum time range of
15 s
• Statistics: Counter with the trip commands issued by the device, as well as record-
ing of the fault current data and accumulation of the interrupted fault currents
• Communication with central control and memory components possible via serial in-
terfaces (depending on the individual ordering variant), optionally via data line,
modem or fibre optics
®
)
1.3 Characteristics
29