Introduction
1-12 7SA6 Manual
C53000-G1176-C133-1
• Time delays and measured value set point interrogation.
Command
Processing
• Switching on and off switchgears manually via the local control keys, configurable
function keys, via the system interface (e.g. of the SICAM
®
or LSA) or via the
operator interface (by means of personal computers and the operating program
DIGSI
®
4)
• Feedback information on switching states via the circuit breaker auxiliary contacts
(for commands with feedback information)
• Plausibility check of the circuit breaker positions and interlocking conditions, for
switching operations
Monitoring
Functions
• 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;
• Checking for the load impedance, the measured direction and the phase sequence.
Further Functions • Battery buffered real time clock, which may be sychronized via a synchronization
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);
• Earth fault protocols for up to 8 earth faults (devices with sensitive earth fault
detection)
• Fault recording memory and data transfer for analogue and user configurable
binary signal traces with a maximum time range of 15 s;
• Switching statistic: the statistic comprises the number of trip and close commands
issued by the device, the recorded fault data and interrupted fault 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. n
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