Fault Records; Demand; Data Log - Siemens Argus 7SR21 Technical Manual

7SR210 & 7SR220 Description of Operation
6.3.4

Fault Records

Up to 100 fault records are stored and can be downloaded from the relay through the communication interface,
with time & date of trip, measured quantities and type of fault. The last 10 fault records are displayed on the relay
fascia.
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 using Reydisp Evolution via Relay > Data Records > Reset Data
Log Record.
6.3.5

Demand

The Demand feature can be used to build trend and maximum/minimum demand records. Up to 10,080 individual
time stamped records can be stored at a user defined rate e.g. 35 days @ 5 minute intervals and > 1 year @ 1
hour intervals.
Maximum, minimum and mean values of line current, voltage and power (where applicable) are available as
instruments which can be read in the relay INSTRUMENTS MENU or via Reydisp Evolution.
In the menu DATA STORAGE > DEMAND / DATA LOG: -
The Data Log Period setting is used to define the period between stored samples.
The Gn Demand Window setting defines the maximum period of time over which the demand values are
calculated. A new set of demand values is established after expiry of the set time.
The Gn Demand Window Type is the mode used to calculate demand values and can be set to FIXED or
PEAK or ROLLING: -
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.
The statistics can be reset from a binary input or communication command, after a reset the update period and
window are immediately restarted.
6.3.6

Data Log

The Data log feature can be used to build trend and maximum/minimum demand records. Up to 10,080 individual
time stamped records of each phase current and voltage (where fitted) analogue signal are recorded and stored
at a user defined rate e.g. 35 days @ 5 minute intervals and > 1 year @ 1 hour intervals.
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