Event Records; Waveform Records; Fault Records - Siemens 7SR12 Argus Manual

7SR11 & 7SR12 Description Of Operation
When set to FIXED the maximum, minimum and mean values demand statistics are calculated over
fixed Window duration. At the end of each window the internal statistics
are reset and a new window is started.
When set to PEAK the maximum and minimum values since the feature was reset are recorded.
When set to ROLLING the maximum, minimum and mean values demand statistics are calculated over
a moving Window duration. The internal statistics
are updated when the window advances every Updated Period.
The statistics can be reset from a binary input or communication command, after a reset the update period and
window are immediately restarted.
6.5.3 E R
VENT ECORDS
The event recorder feature allows the time tagging of any change of state (Event) in the relay. As an event
occurs, the actual event condition is logged as a record along with a time and date stamp to a resolution of 1
millisecond. There is capacity for a maximum of 1000 event records that can be stored in the relay and when the
event buffer is full any new record will over-write the oldest. Stored events can be erased using the DATA
STORAGE>Clear Events setting or from Reydisp.
The following events are logged:
Change of state of Binary outputs.
Change of state of Binary inputs.
Change of Settings and Settings Group.
Change of state of any of the control functions of the relay.
Protection element operation.
All events can be uploaded over the data communications channel(s) and can be displayed in the 'Reydisp'
package in chronological order, allowing the sequence of events to be viewed. Events can be selected to be
made available spontaneously to an IEC 60870-5-103, Modbus RTU or DNP 3.0 compliant control system. The
function number and event number can also be changed. The events are selected and edited using the Reydisp
software tool.
For a complete listing of events available in each model, refer to Technical Manual Section 4 'Data
Communication'.
6.5.4 W
AVEFORM
Relay waveform storage can be triggered either by user selected relay operations, from the relay fascia, from a
suitably programmed binary input or via the data comms channel(s). The stored analogue and digital waveforms
illustrate the system and relay conditions at the time of trigger. An output is provided to indicate when a new
record has been stored.
A waveform can also be stored from the fascia using the DATA STORAGE/Waveform Storage>Trigger
Waveform setting
Waveform records are stored in real time into RAM memory and then archived to non-volatile memory as a
background task during quiescent periods, see 6.4.7 below. Sufficient RAM is allocated for 10 seconds of
waveform data. This is allocated to records according to the user setting Record Duration which has options of
10x1s, 5x2s, 2x5s or 1x10s. 10 records are always stored in the archive regardless of their duration and of the
value of this user setting but if a new record is triggered before the oldest record in RAM is archived, data can be
lost. If records are expected in rapid succession, such as with short deadtime autoreclose, this setting should be
selected to suit. The most recent is waveform 1. The user can also specify the percentage of waveform storage
prior to waveform triggering. When the waveform archive buffer is full (i.e. 10 records are stored) the triggering of
a new waveform record causes the oldest record - waveform 10 – to be overwritten.
'A' variant software devices provide 5 waveform records.
Waveforms are sampled at a rate of 32 samples per cycle.
Stored waveforms can be erased using the DATA STORAGE/Waveform Storage>Clear Waveforms setting or
from Reydisp.
6.5.5 F R
AULT ECORDS
Up to ten fault records can be stored and displayed on the Fascia LCD. Fault records can be triggered by user
selected relay operations or via a suitably programmed binary input. An output is provided to indicate when a
new record has been stored.
Chapter 1 Page 82 of 88
R .
ECORDS
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