Thytronic NA016 - Residual Overcurrent - 50 N;51 N

FUNCTION CHARACTERISTICS
31
NA016 - Manual - 05 - 2022
Residual overcurrent - 50N/51N
Preface
Three operation thresholds, independently adjustable (I
E
>, I
E
>>, I
E
>>>) with adjustable delay (t
E
>,
t
E
>>, t
E
>>>).
For each threshold a reset time can be set (t
E>RES
, t
E>>RES
, t
E>>>RES
) useful to reduce the clearing
time for intermittent faults.
Operation and settings
The residual fundamental frequency current) is compared with the setting value. Current above the
associated pickup value is detected and a start is issued. After expiry of the associated operate time
a trip command is issued; if instead the current drops below the threshold, the element is restored.
For all elements the upper limit for measuring is 10 I
En
.
All elements can be enabled or disabled by setting the relative start and/or trip output to a selectable
relay inside the Set \ Relays menu.
An adjustable reset time delay is provided for every threshold t
E>RES
, t
E>>RES
, t
E>>>RES
).
t-int-F50N-51N.ai
I
E
t
E
>
def
I
E
>
def
I
E
>>
def
t
E
>>
def
t
TRIP
General operation time characteristic for the residual overcurrent elements - 50N/51N
Timers-F50N-51N.ai
IE> element - 50N/51N - residual overcurrent timers
IE> Start
IE> Trip
t
E>
t
E>
INPUT
t
E>RES
t
E>RES
t
E>RES
t