Firmware and Service Manual P74x/EN VH/Na7
Version History
MiCOM P741, P742, P743
(
VH) 16-
1
Relay type: P740 …
Software
Version
Hardware
Suffix
Original
Date of Issue
Description of Changes
S1
Compatibility
Technical
Documentation
Major Minor
00
B Feb 2003
Original Issue
First release to production
V2.07 P740/EN xx/D22
31
C3.4 J or K May 2006
Original Issue
P741 and P743 Evolution with extended User Interface
(32 Controls Inputs, 10 Function Keys and 18 tricolour LEDs).
P742 Evolution with new User Interface (32 Controls Inputs).
Control Input status stored in FLASH memory
10 Maintenance Records instead of 5.
V2.12
Patch 31
P740/EN xx/E33
31
C3.5 J or K Dec 2006
The Delta I criterion did not block the trip: The 87BB protection
trips even if only one variation of current is detected.
Isolators were considered closed when a status alarm occured
even when the auxiliary voltage supervision was used. The
last position of the isolator is used.
Check zone and circuitry fault with bias characteristic
New mode for circuitry fault and PU error
Different Commissioning modes
V2.13 P740/EN xx/E33
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