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It must be possible to lock the recloser, particularly is maintenance tasks are carried out
on the substation. To this end there are various SIL-V locking and unlocking possibilities:
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From the HMI . There is a specific key marked 79, plus a specific signal led, allowing
recloser operation, locking or unlocking it. In order that the command related to the key
can run, the menu must be in standby mode.
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From the HMI. This command can be executed from the control menu.
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From two pulse inputs. If the substation is equipped with a conventional remote
control, two pulse outputs are usually assigned, where one locks the recloser and the
other locks it.
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Via protocol. This is performed via any means of communication. This is carried out as
if it were a control, and the normal conditions of any control must be met. For example,
if we are operating from the HMI, it is understood that the relay is in local mode,
whereby if a Lock/Unlock command is received via remote control this shall be ignored.
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From a level input. In this case the recloser monitors the status of the input. This may
be of use if the company has a handle with a key.
In the first four cases, the equipment stores the lock situation in the non-volatile memory,
as the last control must be know for a possible re-start.
The auto-recloser´s start up is shown in the following figure: There are two stable
conditions here, Standby and Lockout, the other conditions are transient.