Siemens SIPROTEC 7ST6, Руководство пользователя, Страница: 251 / 356

3.3 Commissioning
251
7ST6 Manual
E50417-G1176-C251-A3
3.3.10 Trip and Close Test with the Circuit Breaker
The circuit breaker and tripping circuits can be conveniently tested by the device
7ST6.
The procedure to do so is described in detail in the SIPROTEC
®
System Description.
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
circuit breaker auxiliary contacts must be checked.
3.3.11 Switching Test of the Configured Operating Equipment
Switching via
Command Input If the configured operating devices were not switched sufficiently in the hardware test
already described, 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 using 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 the SIPROTEC
®
4 System Description (Order
No. E50417-H1176-C151). The switching authority must be set in correspondence
with the source of commands used. With the switching mode, you can choose
between locked and unlocked switching. In this case, you must be aware that un-
locked switching is a safety risk.
Control from a
Remote Control
Centre If the device is connected to a remote substation via a system interface, the corre-
sponding 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.
3.3.12 Creating Oscillographic Recordings for Test
In order to be able to test the stability of the protection also during switch-on proce-
dures, closing tests can also be carried out at the end. Oscillographic records obtain
the maximum information about the behaviour of the protection.
Requirement Along with the capability of storing fault recordings via pickup of the protection func-
tion, the 7ST6 also has the capability of initiating a measured value recording using
the operator control program DIGSI
®
using the serial interface and via binary inputs.
For the latter, event
„>Trig.Wave.Cap.“
must be allocated to a binary input. Trig-
gering for the oscillographic recording then occurs, for instance, via the binary input
when the protection object is energized.
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.
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