Thytronic NC20 - Page 78

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78
NC2 0 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Fun_49_Dth.ai
Common configuration
&
dDθ/dt + Dθ/T = (Ith/I
B
)
2
/T
Init DTheta
Dθ ≥ DthAL1
Dth>
Binary input INx
T0
Logic
INx t
ON
INx t
ON
INx t
OFF
T0
n.o.
n.c.
INx t
OFF
I
th
≥1
K
INR
Dth>
CB-State
ON≡Enable element
(Pickup within CLP)
(Pickup outside CLP)
Pickup - CLP setting change
Block1, Block2
T0
t
DthCLP
DthCLPMode
t
DthCLP
I
th
∙ K
INR
BF Enable (ON≡Enable)
Dth>BF
towards BF logic
Dth> BF
&
Trip D t h >
TRIPPING MATRIX (LED+RELAYS)
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