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Chapter 1) 7SR23 DAD Description Of Operation
To achieve accurate instrumentation values for the fault records when testing, ensure a drop off delay is applied
to the test set so that the injected quantities remain on for a short duration, typically 20ms, after the relay has
issued the trip output. This extended period of injection simulates the behaviour of the power system where
faulted conditions are present until CB operation.
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.
The SYSTEM CONFIG > Trip Alert = Disabled setting allows the above to be switched off e.g. during
commissioning tests.
6.5
Metering
The metering feature provides real-time data available from the relay fascia in the 'Instruments Mode' or via the
data communications interface.
For a detailed description refer to Technical Manual Section 2 – Settings and Instruments.
©2013 Siemens Protection Devices Limited
Chapter 1 Page 32 of 36
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