Micom P721, Техническое руководство

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Application Guide P72x/EN AP/C21
MiCOM P721/P723 Page 45/52
5. SETTING GROUP SELECTION (P721 & P723 ONLY)
MiCOM P721 and P723 relays have two setting groups associated to the protection
functions named PROTECTION G1 and PROTECTION G2. Only one group is active.
Switching between the groups can be done using:
−
The relay front panel interface ( CONFIGURATION > GROUP SELECT >
SETTING GROUP 1 or 2 ),
−
A dedicated logic input ( AUTOMAT. CTRL > INPUT X > CHANGE SETTING )
where X is the chosen logic input,
−
The communications port (refer to the Mapping Database for detailed information).
To avoid any false trip, the change of setting group is only carried out when no protection
function is running.
If a setting group change is received during any protection or automation function, it is stored
and executed after the last timer has elapsed.
The user can check which one of the active group is active looking under the OP
PARAMETERS menu.
The user can also assign the active group to an output relay. Using a normally open contact,
this means that:
−
an open contact indicates that the active group is Group 1
−
a closed contact indicates that the active group is Group 2
5.1 Change of setting group done by a digital input
The setting group can be changed by the activation of a digital input (on level).
Warning: if the digital input that has been assigned to the change of setting group operates
on level (low or high), it is not possible to change the setting group by remote communication
or the front panel.
5.2 Switch between active groups
When powering on the relay, the group selected (Group 1 or Group 2) corresponds to the
state of the logic input. This means:
A - With a Logic input configuration = 0
Group 1 = logic Input is not active
Group 2 = logic Input is active
If the programmed logic input is supplied with +V, the active group will be G1.
If the programmed logic input is not supplied with +V, the active group will be G2.
B - With a Logic input configuration = 1
Group 1 = logic Input is not active
Group 2 = logic Input is active
If the set logic input is energized with +V, the active group will be G2.
If the set logic input is not energized with +V, the active group will be G1.