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Functions
6.23.4 Applying the Function Parameter Settings
Minimum,
Maximum and
Average Values
Set Points
Data Storage for
Fault Recording
6-312
In the event of transfer to a central device, the request for data transfer can be exe-
cuted automatically and can be selected to take place after each fault detection by the
protection, or only after a trip.
In addresses 2811 to 2814 you can determine the time intervals for the calculation
of minimum, maximum and average values.
The tracking of minimum and maximum values can be reset automatically at a pre-
definied point in time. To select this feature, address 2811 MinMax cycRESET is set
to Yes . The point in time when reset is to take place (the minute of the day in which
reset will take place) is set in address 2812 MiMa RESET TIME . The reset cycle (in
days) is entered at address 2813 MiMa RESETCYCLE , and the date for starting the
cyclical process in days after completion of the configuration procedure is entered in
address 2814 MinMaxRES.START .
The time interval for measured value averaging is set at address 2801 DMD
Interval . The first number specifies the averaging time window in minutes while the
second number determines the number of updates within the time window. A setting
of 15 Min., 3 Subs , for example, means that time averaging occurs for all
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 2802 DMD Sync.Time whether the selected time period for the
averaging is to begin on the hour ( On The Hour ) or if it is to be synchronized with a
different point in time ( 15 After Hour , 30 After Hour or 45 After Hour ).
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 Measurement (Measurement) in the sub-menu
SET POINTS (MV) by overwriting the existing values.
The configuration of the fault recording memory is done in the sub-menu Fault re-
cording of the menu PARAMETER . A distinction is made between the reference in-
stant (relative time = 0) and the storage criterion (trigger ) of the fault recording (ad-
dress 402A WAVEFORMTRIGGER ). This setting can only be modified with DIGSI
der " 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 ( Save w. Pickup )
or the device trip command ( Save w. TRIP ) can be the storage criterion. The device
trip command can also be used as reference time ( Start w. TRIP ); 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 (ad-
dress 403A WAVEFORM DATA = Fault event ). If automatic reclosure is implement-
ed, the entire system disturbance — possibly with several reclose attempts — up to
the ultimate fault clearance can be stored (address 403A WAVEFORM DATA = Power
System fault ). This facilitates the representation of the entire system fault history,
®
4 un-
7SA6 Manual
C53000-G1176-C156-2
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