Thytronic XMR-D - Page 129

FUNCTION CHARACTERISTICS
129
46LTS1.ai
I
2
t
2>RES
T0
RESET
t
2 >
0T
≥1
≥1
t
2>def
t
2>inv
t
2>RES
Start I2>
Trip I2>
CB-State
Start I
2ndh>
ON≡Inhibit (from I2>> element)
ON≡Enable I2> overcurrent element
(Pickup within CLP)
(Pickup outside CLP)
I2> inhibition
Block1, Block2
&
T 0
t
2CLP>
&
2nd harmonic restraint enable (ON≡Enable)
I2>2ndh-REST
I2CLP>Mode
I
2 CLP >def
t
2CLP >
I
2 CLP >inv
I
2
≥ I
2
>
TRIPPING MATRIX (LED+RELAYS)
I
2
> Curve
0T
A
B
C
A =“1”A =“0 or OFF”
Output
t
2CLP>
I2> Enable
I2> Negative sequence overcurrent element (46) block diagram
t
2CLP>
CB State
CB OPEN CB CLOSED CB OPEN
Output t
2CLP>
t
0.1 s
HIGH THRESHOLD/
BLOCK
LOW THRESHOLD/
UNBLOCK
HIGH THRESHOLD/
BLOCK
A = ON - Change setting
B = OFF
C = ON - Element blocking
I2>TR-K
I2>TR-L
I2>ST-L
I2>ST-K
≥1
CLP I2>
&
State
I
2
>
inv
I
2
≥ I
2
>
def
I
2
≥ I
2
>
inv
I
2
>
def
&
State
Negative sequence overcurrent (46LT) - first threshold logic diagram (I2>)
XMR-D EQUIPMENT MANUAL
Ed. 2.9 - 02/2021