FUNCTION CHARACTERISTICS
115
NVA100X-D - Manual - 02 - 2016
Negative sequence overcurrent (46M) - Logic diagram of the second threshold (I2>>)
Starting control set
Starting
detection
Fun-F46M_S2.ai
I
2
t
2>RES
T0
RESET
t
2
>
0T
≥1
t
2>def
t
2>inv
t
2>RES
Start I2>
Trip I2>
ON≡Inhibit (from I2>> element)
ON≡Enable I2> overcurrent element
(Pickup within CLP)
(Pickup outside CLP)
I2> inhibition
&
I2CLP>Mode
I
2
CLP
>def
I
2
CLP
>inv
I
2
≥
I
2CLP
>
def (inv)
BF Enable (ON≡Enable)
I2>BF
towards BF logic
I2> BF
&
Trip I2>
TRIPPING MATRIX
(LED+RELAYS)
I
2
> Curve
0T
I2> Enable
I2> Negative sequence overcurrent element (46) block diagram
Output t
2CLP>
I2>TR-K
I2>TR-L
I2>ST-L
I2>ST-K
I
2
>
inv
I
2
≥
I
2
>
def
I
2
≥
I
2
>
inv
I
2
>
def
T0
t
2CLP
>
t
2CLP
>
Block1, Block2
A
B
C
Starting control set
A = ON - Change setting
B = OFF
C = ON - Element blocking
≥1
≥1
A
B
C
A = ON - Change setting
A
B
C
C = ON - Element blocking
A
B
C
B = OFF
&
CLP source
MR Enable
CB-State
I
RUN
=0.1
I
B
Max[I
L1...
I
L3
]
≥
I
RUN
I
L1...
I
L3
Output t
CLP
t
CLP
Max[I
L1...
I
L3
]
≥
I
RUN
Max[I
L1...
I
L3
]
≥
I
RUN
Max[I
L1...
I
L3
]
<
I
RUN
Starting detection
Reset CLP timer
CB State
Restarting
CB OPEN CB CLOSED CB CLOSEDCB OPEN
t
I
RUN
t
CLP
0.1 s
HIGH THRESHOLD/
BLOCK
LOW THRESHOLD/
UNBLOCK UNBLOCK UNBLOCK
HIGH THRESHOLD/
BLOCK
HIGH THRESHOLD/
BLOCK
+UAUX
-UAUX
Motor restart
Binary input INx
T0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
0
n.o.
n.c.
INx
t
OFF
Motor restart
LOW TH. LOW TH.
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