I 2 T Cb Wear; Data Storage; General; Demand - Siemens 7SR10 Argus Series Manual

models)
CB Count to AR Block Manual Open: (Only in
Auto-reclose models)
CB Frequent Ops Count
Binary outputs can be mapped to each of the above counters, these outputs are energised when the user
defined Count Target or Alarm Limit is reached.
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6.2.3 I t CB Wear
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An I t counter is also included and this can provide an estimation of contact wear and maintenance requirements.
The algorithm works on a per phase basis, measuring the arcing current during faults. The I
trip is added to the previously stored value and an alarm is given when any one of the three phase running counts
exceeds the set Alarm limit. The t value is the time between CB contacts separation when an arc is formed,
Separation Time, and the CB Clearance time.
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The I t value can also triggered and reset from a binary input or command.
6.3

Data Storage

6.3.1

General

The relay stores three types of data- relay event records, analogue/digital waveform records, and fault records.
Data records are backed up in non-volatile memory and are permanently stored even in the event of loss of
auxiliary supply voltage. The data storage menu contains the settings for the Demand, Waveform, and Fault
storage features.
NOTE
ZY20 - The user selectable language parameter will be available in Turkish, while the default data like events and
waveform recorder will be available in English.
6.3.2

Demand

Maximum, minimum and mean values of line currents, voltages and power (where applicable) are available as
instruments which can be read in the relay INSTRUMENTS MENU or via Reydisp.
The Gn Demand Window setting defines the maximum period of time over which the demand values are valid. A
new set of demand values is established after expiry of the set time.
The Gn Demand Window Type 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 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.
6.3.3

Event Records

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 ms.
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:
©2018 Siemens Protection Devices Limited
before the AR is blocked. When the target is reached the
relay will only do 1 Delayed Trip to Lockout. An output is
available to reset this value.
Selects whether the CB Count to AR Block is incremented for
Manual Open Operations. If disabled, the CB Count to AR
Block will only increment for protection trip commands.
Logs the number of trip operations in a rolling window period
of one hour. An output is available to reset this counter.
7SR10 Description of Operation
2
t value at the time of
Chapter 1 Page 72 of 77