Thytronic DMC3S - Page 51

51
DMC3S - Manual - 08 - 2021
Second harmonic restraint
Asecond harmonic restraint block can be set by setting to ON the parameter IEeme>2ndh-
REST.
The related parameters are available in the menu Set \ Protections \ Residual emergency overcur-
rent - 51N(Eeme) \ Threshold IEeme>\ Parameters.
t
Eeme>RES
T0
RESET
t
Eeme>
0T
≥1
t
Eeme>inv
t
Eeme>RES
Start IEeme>
Trip IEeme>
ON≡Enable (from 74VT element)
ON≡Disable 25, 32P, 67, 67N elements
ON≡Enable IEeme> residual overcurrent element
74VT
&
TRIPPING MATRIX (LED+RELAYS)
I
Eeme
> Curve
0T
IEeme> Enable
I
Eeme
>TR-K
I
Eeme
>TR-L
I
Eeme
>ST-L
I
Eeme
>ST-K
I
E
≥1
&
State
I
Eeme
>
inv
I
E
≥ I
Eeme
>
def
I
E
≥ I
Eeme
>
inv
I
Eeme
>
def
&
State
≥1
Start I
2ndh>
Block1, Block2
&
2nd harmonic restraint enable (ON≡Enable)
INe>2ndh-REST
&
EnTcIEeme>def
t
Eeme>def
t
CIEeme>def
t
atcIE
>
def
t
atcIEeme
>
def
CB control
0 = t
Eeme>def
1 = t
CIEeme>def
“0”
“1”
CB control
tatcIEeme>def
tcIEeme>deftEeme>def tEeme>def
BREAKER OPEN
Breaker state
Shrink time enable
Threshold timer
t
BREAKER CLOSED
OFF
Shrink time trip
ON
Functional diagram of the threshold of the residual emergency overcurrent function 51N(Eme)