Siemens siprotec 7SA522 User Manual page 172

Functions
6-24
eration. The preset value is usually sufficient. This setting can only be modified with
®
DIGSI 4 under "Additional Settings".
The switch-on-to-fault activation (seal-in) time 6, 7LPH DOO &O (address )
determines the activation period of the protection functions enabled during each ener-
gization of the line (e.g. fast tripping high-current stage). This time is started by the in-
ternal circuit breaker switching detection when it recognizes energization of the line or
by the circuit breaker auxiliary contacts, if these are connected to the device via binary
input to provide information that the circuit breaker has closed. The time should there-
fore be set to be longer than the circuit breaker operating time during closing plus the
operating time of this protection function plus the circuit breaker operating time during
opening. This setting can only be modified with DIGSI
tings".
In address  /LQH &ORVXUH the criteria for the internal recognition of line ener-
gization are determined. In the case of RQO\ ZLWK 0DQ&O only the manual close sig-
nal 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 transformer 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 af-
ter 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. in-
creased reach of the distance protection). This setting can only be modified 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 cor-
rectly parameterized in the system data (section 6.1.1, address  8 WUDQV
IRUPHU = 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 re-
quired, set ZLWK 6\QFKURQLVPFKHFNIf the manual close function of the device is
not to be used at all, set 6<10$1&/ to 1R.
®
4 under "Additional Set-
7SA522 Manual
C53000-G1176-C119-2