FUNCTION CHARACTERISTICS
56
NA30 - Manual - 04 - 2022
Fun_49_Dth.ai
Common configuration
&
dDθ/dt + Dθ/T = (Ith/I
B
)
2
/T
Init DTheta
Dθ
≥
Dth>
Dth>
Binary input INx (x=1...8-16)
T 0
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
Start I
2ndh>
ON≡Enable element
(Pickup within CLP)
(Pickup outside CLP)
Pickup - CLP setting change
Block1, Block2, Block4
T 0
t
DthCLP
&
2nd harmonic restraint enable (ON≡Enable)
Dth2ndh-REST
DthCLPMode
t
DthCLP
I
th
∙
K
INR
BF Enable (ON≡Enable)
Dth>BF
towards BF logic
Dth> BF
&
Trip Dth>
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 50/51 element (ON≡Inhibit)
50/51 inhibition
&
50/51block enable (ON≡Enable)
Dth>disby50-51
T DthIN
Thermal image (49) - Logic diagram of the trip threshold
To Next Page
Loading...
