Siemens 7SR10 Argus Series, Manual

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7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 73 of 77
• 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.
6.3.4 Waveform Records
Relay waveform storage can be triggered either by user selecting the relay operations from the relay fascia from a
suitably programmed binary input or via the data communications channel(s). The stored analogue and digital
waveforms illustrates 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.
In total, the relay provides 15 s of waveform storage; this is user selectable to 15 Rec x 1 Sec,
7 Rec x 2 Sec, 3 Rec x 5 Sec, 1 Rec x 15 Sec records. When the waveform recorder buffer is full any new
waveform record will over-write the oldest. The most recent record is Waveform 1.
As well as defining the stored waveform record duration, the user can select the percentage of the waveform
storage prior to triggering.
Waveforms are sampled at a rate of 1600 Hz.
Stored waveforms can be erased using the
DATA STORAGE > Clear Waveforms setting or from Reydisp.
6.3.5 Fault Records
Up to fifteen fault records can be stored and displayed on the Fascia LCD. Fault records can be triggered by user
selected via relay operations or via a suitably programmed binary input. An output is provided to indicate when a
new record has been stored.
Fault records provide a summary of the relay status at the time of trip, i.e. the element that issued the trip, any
elements that were picked up, the fault type, LED indications, date and time. The
Max Fault Rec. Time
setting
sets the time period from fault trigger during which the operation of any LEDs is recorded.
The relay can be set to automatically display the fault record on the LCD when a fault occurs by enabling the
SYSTEM CONFIG > Trip Alert setting. When the trip alert is enabled the fault record will be displayed until the
fault is removed.
When examined together the event records and the fault records will detail the full sequence of events leading to
a trip.
Fault records are stored in a rolling buffer, with the oldest faults overwritten. The fault storage can be cleared with
the DATA STORAGE > Clear Faults setting or from Reydisp.
6.3.6 Energy Storage
The measured Power is continuously integrated (over a one-second window) to produce 4 Energy quantities:
• Active Export Energy (W)
• Active Import Energy (W)
• Reactive Export Energy (VAr)
• Reactive Import Energy (VAr)
The Direction of Energy transfer is set by: SYSTEM CONFIG> Export Power/Lag VAr . With both Export Power
(W) and Lag VAr (VAr) set to be +ve , the Direction of Energy transfer will follow the IEC convention, as shown in
the figure.