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78
NC20 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Fun_49_Dth.ai
Common configuration
&
dD
θ
/dt + D
θ
/T = (Ith/I
B
)
2
/T
Init DTheta
D
θ
≥
DthAL1
Dth>
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
I
t h
≥
1
K
INR
Dth>
CB-State
ON
≡
Enable element
(Pickup within CLP)
(Pickup outside CLP)
Pickup - CLP setting change
Block1, Block2
T
0
t
DthCLP
DthCLPMode
t
D t h C L P
I
t h
∙
K
I N R
BF Enable (ON
≡
Enable)
Dth>BF
towards BF logic
Dth> BF
&
Trip Dth>
TRIP
P
ING
M
A
TRIX
(LED
+R
EL
A
Y
S
)
A
B
C
A =“1”
A =“0 or OFF”
Output
t
DthCLP
Dth> Enable
DTh> thermal image (49) block diagram
t
DthCLP
CB State
CB OPEN
CB CLOSED
CB OPEN
Output t
DthCLP
t
0.1 s
HIGH THRESHOLD/
BLOCK
LOW THRESHOLD/
UNBLOCK
HIGH THRESHOLD/
BLOCK
A = ON - Change setting
B = OFF
C = ON - Element blocking
Dth>-L
Dth>-K
≥
1
CLP Dth
from 50/51Fundamental element (ON
≡
Inhibit)
50/51 fun inhibition
&
50/51Fundamental block enable (ON
≡
Enable)
Dth>disby50-51 fun
from 50/51RMS element (ON
≡
Inhibit)
50/51 RMS inhibition
&
50/51RMS block enable (ON
≡
Enable)
Dth>disby50-51 RMS
T
DthIN
Thermal image (49) - Logic diagram of the trip threshold
