Thytronic XMR-T - Page 79

FUNCTION CHARACTERISTICS
79
46LTS2.ai
I
2
t
2>>RES
T0
RESET
t
2>>def
0T
≥1
t
2>>def
t
2>>RES
Start I2>>
Trip I2>>
CB-State
Start I
2ndh>
ON≡Enable I2>> overcurrent element
(Pickup within CLP)
(Pickup outside CLP)
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
≥ I
2
>>
TRIPPING MATRIX (LED+RELAYS)
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
≥ I
2
>
def
I
2
>>
def
Negative sequence overcurrent (46LT) - second threshold logic diagram (I2>>)
XMR-T EQUIPMENT MANUAL
Ed. 2.9 - 02/2021