122
FUNCTION CHARACTERISTICS
t
EC>>RES
T0
RESET
t
EC>>def
0T
≥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>>
TRIPPING MATRIX
(LED+RELAYS)
A
B
C
Output t
ECCLP>>
IEC>> Enable
IEC>> calculated residual overcurrent element Block diagram
t
ECCLP>>
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
EC
(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
XMR-T EQUIPMENT MANUAL
Ed. 2.9 - 02/2021
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