Installation and Commissioning
8-657SA6 Manual
C53000-G1176-C133-1
switched on and off from the device via the integrated control element. The feedback
information of the circuit breaker position injected via binary inputs is read out at the
device and compared with the actual breaker position. For devices with graphic
display this is easy to do with the control display.
The switching procedure is described in Section 7.4.1. The switching authority must
be set in correspondence with the source of commands used. The switching mode can
be selected from interlocked and non-interlocked switching. Please take note that non-
interlocked switching can be a safety hazard.
Switching from a
Remote Control
Centre
If the device is connected to a remote substation via a system (SCADA) interface, the
corresponding switching tests may also be checked from the substation. Please also
take into consideration that the switching authority is set in correspondence with the
source of commands used.
8.3.16 Triggering Oscillographic Recordings
At the end of commissioning, an investigation of switching operations of the circuit
breaker(s) or primary switching device(s), under load conditions, should be done to
assure the stability of the protection during the dynamic processes. Oscillographic
recordings obtain the maximum information about the behaviour of the 7SA6.
Requirements Along with the capability of recording waveform data during system faults, the 7SA6
also has the capability of capturing the same data when commands are given to the
device via the service program DIGSI
®
4, the serial interfaces, or a binary input. For
the latter, the binary input must be assigned to the function “!7ULJ:DYH&DS”
(FNo 4). Triggering for the oscillographic recording then occurs when the input is
energized. For example, an auxiliary contact of the circuit breaker or control switch
may be used to control the binary input for triggering.
An oscillographic recording that is externally triggered (that is, without a protective
element pick-up or device trip) is processed by the device as a normal fault recording
with the exception that data are not given in the fault messages (trip log). The
externally triggered record has a number for establishing a sequence.
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