Thytronic DMC3S - Page 47

47
DMC3S - Manual - 08 - 2021
The first threshold IE> can be inhibited by the start of at least one of the two thresholds IE>>, IE>>>
with Deactivation IE> by start IE>>, Deactivation IE> by start IE>>> (IE>disbyIE>>, IE>disb-
yIE>>>) in the menu Set \ Protections \ Residual overcurrent - 50N/51N \ Threshold IE>>, Thresh-
old IE>>>\ Parameters.
In the same way, the second threshold IE>> can be inhibited by the start of the third threshold IE>>>
with Deactivation IE>> by start IE>>> (IE>>disbyIE>>>) in the menu Set \ Protections \ Resid-
ual overcurrent - 50N/51N \ Threshold IE>>>\ Parameters..
A constant reset time can be set for each of the thresholds (tE>
RES
, tE>>
RES
, tE>>>
RES
).
Shrink time
For each of the thresholds programmed with definite time characteristic, you can select contracted
time by setting to ON the parameter EnTcIE>def, EnTcIE>>def, EnTcIE>>>def and
regulating the contracted time (tcIE>def, tcIE>>def, tcIE>>>def) and operating time (tat-
cIE>def, tatcIE>>def, tatcIE>>>def).
Once the breaker closes, during the operating time (e.g.: tatcIE>def), the value of the trip time
(e.g.: tE>def ) is replaced by the contracted time (e.g.: tcIE>def ); when the operating time ex-
pires the trip time is reset (e.g.: tE>def ).
The parameters are available in the menu Set \ Protections \ Residual overcurrent - 50N/51N \
Threshold IE> (Threshold IE>>, Threshold IE>>>) \ Definite time.
Second harmonic restraint
For each of the three thresholds (I
E
>, I
E
>>, I
E
>>>) you can set a second harmonic restraint block
by setting to ON the parameter IE>2ndh-REST, IE>>2ndh-REST, IE>>>2ndh-REST.
The parameters are available in the menu Set \ Configuration parameters A(or B) \ Residual overcur-
rent - 50N/51N \ Threshold IE> (Threshold IE>>, Threshold IE>>>) \ Parameters.
Fun_50N-51NS1.ai
t
>RES
T0
RESET
t
E>
0T
≥1
t
E>inv
t
E>RES
Start IE>
Trip IE>
Start I
2ndh>
ON≡Inhibit
(from IE>> and/or IE>>> residual overcurrent element)
ON≡Enable IE> residual overcurrent element
IE> inhibition
Block1, Block2
&
&
2nd harmonic restraint enable (ON≡Enable)
IE>2ndh-REST
TRIPPING MATRIX (LED+RELAYS)
I
E
> Curve
0T
IE> Enable
I
E
>TR-K
I
E
>TR-L
I
E
>ST-L
I
E
>ST-K
I
E
≥1
&
State
I
E
>
inv
I
E
≥ I
E
>
def
I
E
≥ I
E
>
inv
I
E
>
def
&
State
&
EnTcIE>def
t
E>def
t
CIE>def
t
atcIE
>
def
t
atcIE
>
def
CB control
0 = t
E>def
1 = t
CIE>def
“0”
“1”
CB control
tatcIE>def
tcIE>deftE>def tE>def
BREAKER OPEN
Breaker state
Shrink time enable
Threshold timer
t
BREAKER CLOSED
OFF
Shrink time trip
ON
Functional diagram of the rst threshold (IE>) of the residual overcurrent function 50N/51N