Siemens siprotec 7SA522 - Triggering Oscillographic Recordings for Test

3 Mounting and Commissioning
428
7SA522 Manual
C53000-G1176-C155-3
the source of commands used. With the switch mode it is possible to select between
interlocked and non-interlocked switching. Note that non-interlocked switching consti-
tutes a safety risk.
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.
3.3.19 Triggering Oscillographic Recordings for Test
In order to be able to test the stability of the protection during switchon procedures
also, switchon trials can also be carried out at the end. Oscillographic records obtain
the maximum information about the behaviour of the protection.
Prerequisite Along with the capability of storing fault recordings via pickup of the protection func-
tion, the 7SA522 also has the capability of capturing the same data when commands
are given to the device via the service program DIGSI
®
, the serial interface, or a binary
input. For the latter, event ´!7ULJ:DYH&DSµ must be allocated to a binary input.
Triggering of the recording is done e.g. via the binary input on switch-on of the protec-
tion object.
Those that are externally triggered (that is, without a protective element pickup) are
processed by the device as a normal oscillographic record. For each oscillographic
record a fault record is created which is given its individual number to ensure that as-
signment can be made properly. However, these recordings are not displayed in the
fault indication buffer, as they are not fault events.
Start Triggering
Oscillographic
Recording
In order to start a test measurement recording via DIGSI
®
, select in the left of the
window the operator function Test. Double-click in the list view the entry Test Wave
Form (see Figure 3-29).