Thytronic NA011 - Page 44

FUNCTION CHARACTERISTICS
44
NA011 - Manual - 05 - 2022
The delayed reclosure starts the timer t
d
(reclosure fault discrimination time); at the same time the
reclaim timer t
r
is started; if no more trip within t
r
, once the reclaim time has elapsed, the system
comes back to reset. (Successful rapid + slow + delayed reclosures).
Conversely, if a further trip within t
d
arises, the automatic reclosing system is blocked and a failed
reclosure command is issued.
Following trips after the t
d
up to five reclosures may be programmed by means the N.DAR parameter
available inside the Set \ Auto-reclose - 79 menu.
CB manual CLOSE
The intentional CB closing command start the reclaim (t
r
) and Manual close fault discrimination (t
d
)
timers if the manual close discrimination timer is enabled (79-MC-td-EN=ON).
CB manual OPEN
The intentional CB opening command reset the reclaim (t
r
) if the Reset cycle from manual open pa-
rameter is enabled (79-MO-RES=ON).
CB CLOSED
CB OPEN
CB OPEN
CB OPEN
CB CLOSED CB CLOSED
MC-tdEN-diagram.ai
t
rdt
CB State
t
CB manual close command
CB CLOSED
Reclaim timer
CB manual close
79-MC-td-EN
t
t
r
CB CLOSED
CB OPEN
CB OPEN
CB OPEN
CB CLOSED
MO-RES-diagram.ai
t
rdt
CB State
t
t
rdt
Reset cycle from CB manual open command
CB CLOSED
Reclaim timer
CB manual open
79-MO-RES
t
t
r
t
r