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

FUNCTION CHARACTERISTICS
53
NG10 - Manual - 04 - 2022
Block2out diagram
Pilot wire output
BLOUT1
TRIPPING MATRIX (LED+RELAYS)
ModeBLOUT1
A
B
C
D
≥ 1
t
F-IPh
t
F-IPh/IE
t
F-IE
ST-Iph BLK2
ST-IE BLK2
T 0
t
F-IPh/IE
T 0
t
F-IPh
T 0
t
F-IE
BLK2OUT-Iph
BLK2OUT-Iph/IE
BLK2OUT-IE
A = OFF
B = ON IPh
C = ON IPh/IE
D = ON IE
BLK2OUT-IPh-K
BLK2OUT-IPh-L
BLK2OUT-IPh/IE-K
BLK2OUT-IPh/IE-L
BLK2OUT-IE-K
BLK2OUT-IE-L
87G-M-L Block2 OUT
≥ 1
Start I
E
>>
&
Block2 output
(ON≡ Enable)
IE>>BLK2OUT
Start 87G-M-L
&
Block2 output
(ON≡ Enable)
87G-M-LBLK2OUT
I
E
>> Block2 OUT
I
E
>>> Block2 OUT
64REF(H)> Block2 OUT
I
E
> Block2 OUT
Residual overcurrent or high impedande differential restricted ground fault (50N/51N-87NHIZ) - Logic diagram of the blocking signals
concerning the second element