Micom P721, Technical Manual

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Application Guide P72x/EN AP/C21
MiCOM P721/P723 Page 25/52
NOTES: 1. The protection watchdog contact is normally open. It is closed
when the P721 is healthy. Therefore Aux-1 is closed when the
P721 is not healthy.
2. RL2 is a normally open contact. It closes when there is an ac
buswire failure or the differential element is asserted.
3. If the P79x is used, refer to the P79x manual for a detailed
description of this application.
When using the P723 in busbar applications, configure the buswire shorting contacts as
follows:
•
Set three logic equations as follows:
EQUATION A
EQUATION A.00 operator = =
EQUATION A.00 operand = [95A] tSup
T Operate = 0.00 s
T Reset = 0.00 s
EQUATION B
EQUATION B.00 operator = =
EQUATION B.00 operand = [95B] tSup
T Operate = 0.00 s
T Reset = 0.00 s
EQUATION C
EQUATION C.00 operator = =
EQUATION C.00 operand = [95C] tSup
T Operate = 0.00 s
T Reset = 0.00 s
•
Latch equation A
LATCH FUNCTIONS
Latch tEqu. A = 1
•
Latch equation B
LATCH FUNCTIONS
Latch tEqu. B = 1
•
Latch equation C
LATCH FUNCTIONS
Latch tEqu. C = 1
•
Assign tEqu.A, tEqu.B and tEqu.C to normally open contacts:
OUTPUT RELAYS
tEqu.A = 0000000000000001
Logic output relay 4 = 1
tEqu.B = 0000000000000010