Settings - Siemens siprotec 7SA6 User Manual

Functions
Three-pole
Coupling
6-22
during opening. This setting can only be changed with DIGSI

Settings".

In address  /LQH &ORVXUH the criteria for the internal recognition of line
energization are determined. In the case of RQO\ ZLWK 0DQ&O only the manual close
signal derived via binary input is used to recognize the circuit breaker closing
condition. With the setting , 25 8 RU 0DQ&O the measured currents or voltages are
used as an additional criterion to recognise energization of the line. &% 25 , RU 0
& on the other hand implies that either the currents or the circuit breaker auxiliary
contact state is used to determine closing of the circuit breaker. If the voltage
transformers are not situated on the line side, the setting &% 25 , RU 0& must be
used. In the case of , RU 0DQ&ORVH only the currents or the manual close signals
are used to recognize closing of the circuit breaker.
While the seal-in time after all closures (6, 7LPH DOO &O address $, refer
above) is activated following each recognition of line energization, the seal-in time
after manual closures (6, 7LPH 0DQ&O address $) is the time following
manual closure during which special influence of the protection functions is activated
(e.g. increased reach of the distance protection). This setting can only be changed
®
with DIGSI 4 under "Additional Settings".
Note:
For CB Test and automatic reclosure the CB auxiliary contact status derived with the
binary inputs > CB1 ... (FNo. 366 - 371, 410 and 411) are relevant for indicating the
CB switching status. The other binary inputs > CB ... (FNo. 351 - 353, 379 and 380)
apply to the recognition of line status (address 1134) and reset of trip command
(address 1135) which is used by the other protection functions, e.g. echo function,
switch-onto-fault overcurrent etc. For applications with only one CB, both binary input
functions e.g. 366 and 351 can be allocated to the same physical input.
In address  6<10$1&/ the selection is made whether the synchronism check
between the busbar voltage and the voltage of the switched feeder must be done for
a manual close. To do this, either the device must have integrated synchronism check
function or an external device for synchronism check must be connected.
In the former case the synchronism check function must be configured (Section 5.1)
as available, a busbar voltage must be connected to the device and this must be
correctly parameterized in the system data (Section 6.1.1, address  8
WUDQVIRUPHU = 8V\QF WUDQVI as well as the corresponding factors).
If no synchronism check is to be performed with manual closing, set 6<10$1&/ =
ZLWKRXW 6\QFKURQLVPFKHFN. If on the other hand synchronism check is
required, set ZLWK 6\QFKURQLVPFKHFNIf the manual close function of the device
is not to be used at all, set 6<10$1&/ to 1R.
Address  5HVHW 7ULS &0' determines which criteria allow for the reset of an
issued trip command. The setting &XUUHQW2SHQ3ROH ensures that the trip command
resets after the current disappears. The measured current must drop below the value
set in address $ 3ROH2SHQ&XUUHQW before the trip command resets (see
above). With the setting &XUUHQW $1' &% the circuit breaker auxiliary contact must
additionally indicate that the circuit breaker has opened. This setting demands that the
status of the auxiliary contacts is marshalled to a binary input.
Address  SROH FRXSOLQJ determines whether each trip command resulting
from pickup in more than one phase is three-pole, or if three-pole coupling of the trip
command only results when more than one phase is trip ped. This setting is only
®
4 under "Additional
7SA6 Manual
C53000-G1176-C133-1