Interlock rule list
The topological interlock checks a command on the network as it would be after the command. For how the check works, see Topological interlocking; to change the levels, see Set the interlock rules.
Rules
| Id | Label | Default | Checks |
|---|---|---|---|
earthLive | Energizing onto earth | Unlockable | Closing joins an earthed section to an energized or undefined one; the result has a section that is both energized and earthed; an earthing switch is closed while a measurement on the section does not say "no voltage". |
undefinedArea | Switching in an undefined area | Unlockable | Closing with both sides undefined. |
disconnectorLoad | Disconnector under load | Unlockable | A disconnector is closed or opened while load current would flow. |
unsuppliedLoad | Device loses supply | Do not check | An opening leaves a supplied consumer without supply. In practice disconnector, earthing switch and second-position openings, because opening a breaker skips all rules. |
undefinedGrows | Undefined area grows | Unlockable | Closing with one side undefined and the other side not. |
joinNetworks | Joining different networks | Locked | After closing, two different sources certainly reach one section. |
voltageMix | Joining different voltage levels | Locked | Closing certainly joins sections of different nominal voltage, or AC and DC. |
possibleJoin | Possible join | Unlockable | After closing, a join of different networks or voltage levels is possible because a position is not certain. Never stricter than joinNetworks or voltageMix: a kind whose rule is Do not check is not checked. |
Levels: Do not check (not evaluated), Unlockable (blocked; an authorised user may override it for one command), Locked (blocked; no override).
Internal locks
These always apply, cannot be switched off and cannot be overridden.
| Lock | Text shown |
|---|---|
| Position unknown: intermediate, invalid, bad quality or awaited | Position unknown: no command possible |
| Already in the requested position | Already closed, Already open |
| Closing while tripped | Tripped by protection: reset the trip first |
| Truck movement while the breaker is closed | The truck cannot be moved while the breaker is closed |
| Local control | In local control: no remote command possible |
| Local / remote unknown | Control location (local / remote) unknown: no command possible |
| Invalid symbol definition | Symbol definition is invalid: cannot be opened / closed |
| Device state cannot be read | Device state could not be read: interlocks could not be checked |
| Device not in the network | Device is not in the electrical network: topological interlocks could not be checked |
Exception: opening a load-breaking switch
Opening a circuit breaker, load break switch, contactor or the main position of an ATS is never blocked by a rule or by Position unknown. Only In local control, Control location (local / remote) unknown, Already open (when the position is certainly open) and an invalid symbol definition still apply.