Firmware and Service Manual P74x/EN VH/Na7
Version History
MiCOM P741, P742, P743
(
VH) 16-
5
Relay type: P740 …
Software
Version
Hardware
Suffix
Original
Date of Issue
Description of Changes
S1
Compatibility
Technical
Documentation
Major Minor
51
E2.0 K Jan 2010
Software (cont’d):
CB supervision time delay is settable.
I0 supervision with neutral current measured can block 87BB
protection.
CT supervision with max(IA, IB, IC) > 10IN and 50% max (IA,
IB, IC) > min (IA, IB, IC).
87BB PU fault record: starting phase and faulty zone is
indicated.
50BF fault and manual zone tripping: only the zone is
available in the PU fault record.
I>2 & IN>2 have 87BB/P, 87BB/N, I(N)>2&87BBP,
I(N)>2&88BBN blocking options.
new DDB to block overcurrent and earth fault protection.
IEC 61850 phase 2
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