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5.7 Auto-reclose function (79)
5 Control functions
Technical description
216
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Figure 5.7-2 Example sequence of two shots. After shot 2 the fault is
cleared.
1.
Current exceeds the I> setting; the start delay from shot 1
starts.
2.
After the start delay, an OpenCB relay output closes.
3.
A CB opens. The dead time from shot 1 starts, and the
OpenCB relay output opens.
4.
The dead time from shot 1 runs out; a CloseCB output relay
closes.
5.
The CB closes. The CloseCB output relay opens, and the
discrimination time from shot 1 starts. The current is still
over the I> setting.
6.
The discrimination time from the shot 1 runs out; the
OpenCB relay output closes.
7.
The CB opens. The dead time from shot 2 starts, and the
OpenCB relay output opens.
8.
The dead time from shot 2 runs out; the CloseCB output
relay closes.
9.
The CB closes. The CloseCB output relay opens, and the
discrimination time from shot 2 starts. The current is now
under I> setting.
10.
Reclaim time starts. After the reclaim time the AR sequence
is successfully executed. The AR function moves to wait for
a new AR request in shot 1.