FUNCTION CHARACTERISTICS
169
NVA100X-D - Manual - 02 - 2016
t
EC>>RES
T
0
R E S E T
t
EC>>def
0
T
≥
1
t
EC>>RES
t
EC>>def
Start IEC>>
Trip IEC>
>
CB-State
Start
I
2ndh>
IEC>> inhibition
Block1, Block2, Block4
&
IEC>
>
TR-K
IEC>
>
TR-L
IEC>
>
ST-L
IEC>
>
ST-K
T
0
t
ECCLP>>
&
2nd harmonic restraint enable (ON
≡
Enable)
IEC>>2ndh-REST
IECCLP>>Mode
t
ECCLP>>
BF Enable (ON
≡
Enable)
IEC>>BF
towards BF logic
IEC>> BF
&
Trip IEC>>
TRIP
P
ING
M
ATRIX
(LED
+R
EL
AY
S
)
A
B
C
Output
t
E CCLP>>
IEC>> Enable
IEC>> calculated residual overcurrent element Block diagram
t
E CCLP>>
CB State
CB OPEN
CB CLOSED
CB OPEN
Output t
ECCLP
>
>
t
0.1 s
HIGH THRESHOLD/
BLOCK
LOW THRESHOLD/
UNBLOCK
HIGH THRESHOLD/
BLOCK
A = ON - Change setting
B = OFF
C = ON - Element blocking
&
(ON
≡
Inhibit)
Start IEC>>
Start IEC>>
IEC> inhibition
IEC> disbylEC>>
≥
1
CLP IEC>>
ON
≡
Inhibit
(from IEC>>> residual overcurrent element)
ON
≡
Enable IEC>> residual overcurrent element
I
EC>>def
A =“1”
A =“0 or OFF”
I
E C
(Pickup within CLP)
(Pickup outside CLP)
I
ECCLP>>def
I
EC
≥
I
ECCLP>>def
&
State
I
EC
≥
I
EC
>>
def
Note
Inside diagrams and text the IEC is the current residual current calculated by the vector sum of the currents
of the selected side (the H or L side)
Calculated residual overcurrent - 50N(Comp)/51N(Comp) - Second element logic diagram (IEC>>) Sheet 1 of 2