VAMP 52 - Page 165

Technical description 5 Control functions 5.7 Auto-reclose function
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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.