Micom P721, Technical Manual

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User Guide P72x/EN FT/C21
MiCOM P721/P723 Page 27/38
AUTOMAT. CTRL
Heading of the AUTOMAT. CTRL menu.
Latch Functions
Heading of the submenu.
Function
Yes
Setting choice Yes: Latch the trip output relay associated
with the corresponding protection function. The relay will
be remain latched after the fault has disappeared.
Setting choice No: The trip output relay will be active
when the relevant command is active. The relay will not
be active if the relevant command is reset.
Refer to previous table for protection functions list and
comments.
2.8.3
Submenu Blocking Logic 1 / 2
Through the Blocking Logic submenu, the user can block each delayed threshold using a " Start
Block Logic 1 or 2" input (refer to Inputs menu). MiCOM P72x relays have the submenu
Blocking Logic 1 and Blocking Logic 2 available for setting.
It is possible to enable or disable the “blocking” of most protection functions even if a logic
input has been assigned to that function.
Function P721 P723 INFORMATION and COMMENTS
Block [87N] tDiff X X Time delayed earth differential protection threshold
Block [87] tDiff X Time delayed phase differential protection threshold
Block tAux 1 X X Aux1 Logic Input delayed by Aux1 time
Block tAux 2 X X Aux2 Logic Input delayed by Aux2 time
Block tAux 3 X Aux3 Logic Input delayed by Aux3 time
Block tAux 4 X Aux4 Logic Input delayed by Aux4 time
AUTOMAT. CTRL
Blocking Logic 1 / 2
Heading of the Blocking Logic 1 or 2 submenu.
Block Function
No
Enables or disables blocking logic of the function on the
level (logic state =1) of logic input “Start Block Logic 1 or 2”
Refer to previous table for protection functions list.
2.8.4 Outputs Relays submenu
This submenu makes it possible to assign various alarm and trip thresholds (instantaneous
and/or time delay) to a logic output. Excepted from this option are the Watchdog (RL0) and
the Tripping (RL1) outputs (refer to Trip Commands submenu).
The total number of programmable logic outputs for the three relay models is listed in the
table:
Model P721 P723
Output relays 3 7
RL2 relay is a change over relay. The others RL3 to RL8 are normally open relays.