Update Documentation P521/EN AD/B21
MiCOM P521 Page 22/24
Relay type: P521 …
Software
Version
Major Minor
Hardware
Suffix
Original
Date of Issue
Description of Changes
S1
Compatibility
Technical
Documentation
A A Jul 2003 Original Issue V2.09 or Later P521/EN M/B11
B A Oct 2003
ü Current differential blocking logic functionality
changed to inhibit protection timer when blocking
enabled. This fix prevents the current differential from
mal-tripping upon removal of the blocking input
V2.09 or Later P521/EN M/B11
C A Apr 2004
ü Modification to ensure that the loopback alarm is
re-instated following an interruption to the auxiliary
supply
ü Enhancement to prevent both manual trip and close
commands from operating simultaneously
ü Modification to summation amps function in order to
improve measurement accuracy
ü Correction to fault records to include the magnitude of
negative sequence current when the Ι2>> element
operates
ü Modification to allow fault records to be acknowledged
via remote communications
ü Improvements made to setting group 2 dependencies
to ensure all menu cells are displayed correctly
ü Enhancement to allow the contact test, in the
commissioning menu, to be operated via remote
communications
ü Correction to ensure that the tms settings are not
overwritten with the time dial settings when
downloading a setting file via MiCOM S1
V2.09 or Later P521/EN M/B11
01
D A Jun 2004
ü Correction to ensure erroneous ΙDIFF FAIL alarms not
generated
V2.09 or Later P521/EN AD/B21
HARDWARE/SOFTWARE VERSION HISTORY AND COMPATIBILITY (P521/EN VC/B11)
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