Siemens siprotec 7SA6 User Manual page 470

Functions
Limit Values
Data Storage for
Fault Recording
6-288
measured values that arrive within 15 minutes, and that output is updated three times
during the 15 minute window, or every 15/3 = 5 minutes.
Determine in address  '0' 6\QF7LPH whether the selected time period for the
averaging is to begin on the hour (2Q 7KH +RXU) or if it is to be synchronized with a
different point in time ( $IWHU +RXU,  $IWHU +RXU or  $IWHU +RXU).
If the settings for averaging are changed, then the measured values stored in the
buffer are deleted, and new results for the average calculation are only available after
the set time period has passed.
The settings are entered under 0HDVXUHPHQW 0HDVXUHPHQW in the sub-menu
6(7 32,176 09 by overwriting the existing values.
The configuration of the fault recording memory is done in the sub-menu )DXOW
UHFRUGLQJ of the menu 3$5$0(7(5. A distinction is made between the reference
instant (relative time = 0) and the storage criterion (trigger ) of the fault recording
(address $ :$9()25075,**(5). This setting can only be changed with DIGSI
4 under "Additional Settings". Normally the reference instant is the occurrence of
device fault detection, i.e. the fault detection of any protection function is allocated with
the time stamp 0. The fault detection can also be the storage criterion (6DYH Z
3LFNXS) or the device trip command (6DYH Z 75,3) can be the storage criterion.
The device trip command can also be used as reference time (6WDUW Z 75,3); in
this case it is also the storage criterion.
A fault event starts with the fault detection of any protection function and ends with the
reset of the last fault detection. Usually this is also the extent of a fault recording
(address $ :$9()250 '$7$ = )DXOW HYHQW). If automatic reclosure is
implemented, the entire system disturbance — possibly with several reclose
attempts — up to the ultimate fault clearance can be stored (address $ :$9()250
'$7$ = 3RZHU 6\VWHP IDXOW). This facilitates the representation of the entire
system fault history, but also consumes storage capacity during the auto-reclosure
dead time(s). This setting can only be changed with DIGSI
Settings".
The actual storage time encompasses the pre-fault time 35( 75,* 7,0( (address
) ahead of the reference instant, the normal recording time and the post-fault time
3267 5(& 7,0( (address ) after the storage criterion has reset. The maximum
permissible storage period per fault recording 0$; /(1*7+ is set in address .
The fault recording can also be triggered via a binary input, via the keypad on the front
of the device or with a PC via the operation or service interface. The storage is then
dynamically triggered. The length of the fault recording is set in address  %LQ,Q
&$377,0( (maximum length however is 0$; /(1*7+, address  . The pre-
and post-fault times are additive. If the time for the binary input is set to ∞, the duration
of the storage is as long as the binary input is initiated (static), the maximum length
however still is 0$; /(1*7+ (address ).
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4 under "Additional
7SA6 Manual
C53000-G1176-C133-1
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