FUNCTION CHARACTERISTICS
101
Logical block (Block1)
If the U1<BLK1enabling parameters is set to ON and a binary input is designed for logical block
(Block1), the protection is blocked whenever the given input is active.
The trip timer is held in reset condition, so the operate time counting starts when the input block goes
down.
[1]
The enabling parameters are available inside the Set \ Profile A (or B) \ Positive sequence
undervoltage - 27V1 \ U1< Element \ Setpoints menu, while the Block1 function must be assigned to
the selected binary input inside the Set \ Board1(2) inputs \ Binary input IN1-1...INx-x menus.
All parameters can be set separately for A and B setting profiles.
Note 1 The exhaustive treatment of the logical block (Block 1) function may be found in the “Logic Block” paragraph inside CONTROL AND MONITOR-
ING section.
Fun-F27V1_S1.ai
Block 74VT
VT fault (74VT)
(=0 without fault)
RESET
t
U1<def
0T
TRIPPING MATRIX
(LED+RELAYS)
t
U1<def
Start U1<
U1<ST-K
Start U1<
U1<TR-K
U1<ST-L
U1<TR-L
Trip U1<
Trip U1<
BLK1U1<
&
&
&
Enable (ON≡Enable)
Block1 input (ON≡Block)
U1<BLK1
Block1
Block1
U
1
Binary input INx
T 0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T0
n.o.
n.c.
INx
t
OFF
Enable (ON≡Enable)
&
State
U
1
≤
U
1
<
def
U
1
<
def
MMI
Disable 27-37-81 functions by operator
&
(ON≡
Inhibit
)
Disable 27 function by operator
Logic diagram concerning the positive sequence undervoltage element - 27V1
XMR-D EQUIPMENT MANUAL
Ed. 2.9 - 02/2021
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