Siemens siprotec 7SA6, Руководство пользователя

Страница: 502 / 876

Functions
6-312
7SA6 Manual
C53000-G1176-C156-2
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.
6.23.4 Applying the Function Parameter Settings
Minimum,
Maximum and
Average Values 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.
Set Points
The settings are entered under
Measurement (Measurement)
in the sub-menu
SET POINTS (MV)
by overwriting the existing values.
Data Storage for
Fault Recording 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
®
4 un-
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,