Siemens siprotec 7SA522 User Manual page 30

User Defined Logic
Functions
Monitoring
Functions
Further Functions
1-10
• single or two stages
• short drop off and overshoot times.
• Freely programmable combination of internal and external signals for
the implementation of user defined logic functions;
• all common logic functions;
• time delays and measured value set point interrogation.
• Monitoring of the internal measuring circuits, the auxiliary supply, as
well as the hard- and software, resulting in increased reliability;
• monitoring of the current and voltage transformer secondary circuits
by means of summation and symmetry checks;
• trip circuit supervision is possible;
• check of the load impedance, the measured direction and the phase
sequence;
• Monitoring of the battery.
• Battery buffered real time clock, which may be sychronized via a syn-
chronization signal (DCF77, IRIG B via satellite receiver), binary input
or system interface;
• fault event memory for the last 8 network faults (faults in the power
system), with real time stamps (ms-resolution);
• fault recording memory and data transfer for analogue and user con-
figurable binary signal traces with a maximum time range of 15 s;
• switching statistic: counter with the trip commands issued by the de-
vice, as well as record of the short-circuit current and accumulation of
the interrupted short-circuit currents;
• commissioning aids such as connection and direction checks as well
as circuit breaker test functions. All binary inputs and outputs can be
displayed and set directly. This can simplify the wiring check process
significantly for the user;
• 4 setting groups;
• 7 password-levels. n
7SA522 Manual
C53000-G1176-C119-2