Thytronic NG10 - Residual Overcurrent;High Impedance Ground Fault: Second Element Logic

FUNCTION CHARACTERISTICS
52
NG10 - Manual - 04 - 2022
t
E>>RES
T0
RESET
t
E>>
0T
t
E>>def
t
E>>RES
Start IE>>
Trip IE>>
IE>> inhibition
&
IE>>TR-K
IE>>TR-L
IE>>ST-L
IE>>ST-K
BF Enable (ON≡ Enable)
IE>>BF
towards BF logic
IE>> BF
&
Trip IE>>
TRIPPING MATRIX (LED+RELAYS)
IE>> Enable
&
(ON≡ Inhibit )
Start IE>>
Start IE>>
IE> inhibition
IE> disbylE>>
ON≡ Inhibit
(from IE>>> residual overcurrent element)
ON≡ Enable IE>> residual overcurrent element
I
E>>def
I
E
&
State
I
E
≥ I
E
>>
def
Binary input INx
T 0
Logic
INx t
ON
INx t
ON
INx t
OFF
T0
n.o.
n.c.
INx t
OFF
Binary input INx
T 0
Logic
INx t
ON
INx t
ON
INx t
OFF
T0
n.o.
n.c.
INx t
OFF
Binary input INx
T 0
Logic
INx t
ON
INx t
ON
INx t
OFF
T0
n.o.
n.c.
INx t
OFF
Block2 IPh
Block2 IPh/IE
ModeBLIN1
T 0
t
B-Iph
≥ 1
≥ 1
≥ 1
≥ 1
≥ 1
t
B-Iph
t
B-IE
&
IE>>BLK1
Block2 input enable (ON≡ Enable)
Pilot wire input
&
IE>>BLK2IN
BLK2IN-Iph
Start IE>>
Trip IE>>
Iph Block2
IE Block2
BLK2IN-IE
tB timeout
Block2 input
Block2 output
tB-K
tB-L
FROM GROUND PROTECTIONS
FROM ANY PROTECTIONS
FROM PHASE PROTECTIONS
OFF
ON IPh
ON IPh/IE
ON IE
BLIN1
T 0
t
B-IE
Block2 IE
TRIPPING MATRIX (LED+RELAYS)
≥ 1
≥ 1
Binary input INx (x=1,2)
T 0
Logic
INx t
ON
INx t
ON
INx t
OFF
T0
n.o.
n.c.
INx t
OFF
BLK1 IE>>
&
BLK2IN IE>>
&
&
Enable (ON≡ Enable)
Block1
Block1
Block2
Block1
Block1
Block1, Block2
Residual overcurrent or high impedande differential restricted ground fault (50N/51N-87NHIZ) - Logic diagram concerning the second element
See function diagram on next page