Toshiba GRZ100-211B, Instruction Manual

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Single- and three-phase autoreclose:
In this autoreclose mode, single-phase tripping and reclosing are performed if a single-phase fault
occurs, while three-phase tripping and reclosing are performed if a multi-phase fault occurs.
This reclosing mode is simply expressed as "SPAR & TPAR" in the following descriptions.
Shingle-shot autoreclose can be applied to one-breaker reclosing and two-breaker reclosing in the
one-and-a-half breaker busbar system.
Multi-shot autoreclose
In the multi-shot autoreclose, any of two- to four-shot reclosing can be selected. In any case, the
first shot is selected from three types of autoreclose modes as described in the above single-shot
autoreclose. All successive shots (up to three times), which are applied if the first shot fails, are
three-phase tripping and reclosing.
Multi-shot autoreclose cannot be applied to two-breaker reclosing in the one-and-a-half breaker
busbar system..
The autoreclose can also be activated from an external line protection. At this time, all autoreclose
modes described above are effective.
If a fault occurs under the following conditions, three-phase final tripping is performed and
autoreclose is blocked.
•
Reclosing block signal is received from external unit locally or remotely.
•
Throughout the reclaim time
For evolving faults that occurred during the dead time between single-phase tripping and
reclosing, "SPAR & TPAR" functions as follows.
For evolving faults that occurred within the period of time set from the first fault, the reclosing
mode enters the three-phase autoreclose mode. At this time, the total dead time becomes the dead
time for three-phase autoreclose added to the dead time for single-phase autoreclose which has
been used until the evolving fault occurs.
For evolving faults occurred after the set time, three-phase final tripping is performed, and
reclosing is not performed.
If an evolving fault occurs when "SPAR" is selected, three-phase final tripping is performed, and
reclosing is not performed.
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