Ice NP900 Series, Инструкция по применению

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Application Guide - NP900 Series 406 (504
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A996A
specific reclaim times is that if fault is returning in shot specific reclaim time
autorecloser jumps to next shot. If a fault return after successful cycle and
Autoreclosing reclaim time is running recloser will go directly to final trip state and
lock-out state. This behavior can be controlled with settings of the recloser. Both of
these reclaim times can be set to 0 when they are not needed. Recloser function will
skip all timers set to 0. Also is possible to set the AR Reclaim not to be used after
successful reclosing cycle.
7. Autoreclosing Reclaim Time is exceeded and Autorecloser is set to Ready state
waiting for next request.
3.6.4.6 A
UTORECLOSING SEQUENCE FROM
S
TART WITH TWO SHOT FAILURE
For this overcurrent autoreclosing scheme was set non directional overcurrent protection
Start signal to operate as REQ1 starter which was enabled to Shot1 and Shot2 with
following settings. One rapid shot followed by time delayed shot are set for this scheme. In
this scheme the first start time is set to longer than in the unsuccessful reclose shots
arcing time if the fault persists then the allowed towards fault time is reduced.
Figure 3.6.4.6-190 Settings for earth fault reclosing with two shots.
When Start signal is used for the autoreclosing the timings of the fault durations are taken
care by the autorecloser function and the starting / arcing times needs to be set
accordingly. The main operating time settings of the protection should be longer than the
values set to the autorecloser in order the state changes work properly for recloser.