Section 4
Functional description
4.1
Control functions
The device is capable of controlling and monitoring an object, for example, a
disconnector, and handling the object status information. The device can control and
monitor up to three objects. The device can monitor the earthing switch position
indications, with one function per disconnector object. Local/Remote indications are
also a standard; each disconnector has its own Local/Remote position monitoring. In
the Local position, control operations (open or close) can be performed at the site only.
In the Remote position, control operations can be performed from the SCADA system
in the network control center.
4.2
Condition monitoring functions
4.2.1
Communication diagnostics and watchdog
The device is provided with a self-supervision system, that is, a watchdog function.
The self-supervision system handles run-time fault situations and informs the user of
faults through the user HMI (function LED) on the front panel.
In addition to hardware supervision, the self-supervision system is able to re-establish
the cellular connection and VPN connection (if applicable). Furthermore, it is able to
restart the device as a last resort.
4.3
Disconnector control condition monitoring functions
4.3.1
Disconnector travel time monitoring
The OPEN and CLOSE indications are monitored. When a change occurs due to an
activated control operation, the opening or closing travel time is measured. If the
measured travel time is greater than or equal to the set limit values, an alarm is given.
The settings define how the disconnector travel time duration (state change from open
to close or vice versa) is reported.
Travel time is reported in seconds. The alarm signals remain active until the fault
condition is acknowledged.
1MRS758459 C
Section 4
Functional description
ARC600
27
User Manual
