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8.3.15 Trip and Close Test with the Circuit Breaker
8.3.16 Switching Check for the Configured Operating Devices
Switching
via Command
Switching from a
Remote Control
Centre
8.3.17 Triggering Oscillographic Recordings
Requirements
7SA6 Manual
C53000-G1176-C156-2
The circuit breaker and tripping circuits can be conveniently tested by the device
7SA6.
The procedure is described in detail in Section 7.3.
If the check does not produce the expected results, the cause may be established from
the text in the display of the device or the PC. If necessary, the connections of the cir-
cuit breaker auxiliary contacts must be checked:
It must be noted that the binary inputs used for the circuit breaker auxiliary contacts
must be assigned separately for the CB-test. It is accordingly not sufficient that the
auxiliary contacts are assigned to the binary inputs with FNo 351 to 353, 379 and
380 (depending on the options of the auxiliary contacts); in addition, the correspond-
ing FNos 366 to 368 or 410 and/or 411 (according to the functions the auxiliary
contacts provide) must be configured. In the CB-test only the latter ones are analysed.
See also Subsection 6.22.2. Furthermore, the ready state of the circuit breaker for the
CB-test must be indicated to the binary input with FNo 371 .
If the configured operating devices were not switched sufficiently in the hardware test
already described (Subsection 8.3.3), all configured switching devices must be
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 dis-
play 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.
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.
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 re-
cordings obtain the maximum information about the behaviour of the 7SA6.
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
Installation and Commissioning
8-75
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