the protection mode will return to whichever mode was active prior to the lever being
pulled down.
2 Commands from the RCU sent over the short range radios that have originated from a
SCADA operator.
3 Commands from the RCU sent over the short range radios that have originated from an
Operator Control panel in the RCU (if one is fitted).
4 Commands from the RCU sent over the short range radios that have originated from the
RCU itself when certain configurable conditions are met.
The interlocking of these sources of control is defined in the following table, the result of the
interlocking can be summarised as follows:
When a Fusesaver external lever is down, the protection mode is set to the mode predetermined
in the Fusesaver policy file (for example a Fast-Single mode to be used for live line working).
When any Fusesaver external level is down the RCU locks out all Fusesavers on the line from
operations (including mode change) via RCU control panel or SCADA. Normally all the
Fusesavers on the line will have their levers pulled down at the same time so their mode is the
same.
When the Fusesaver external lever is up on all the Fusesavers then the SCADA operator can
control the protection mode or a local operator can control the protection mode depending on the
position of the Remote Control ON switch. However, if desired, the RCU can be configured so
that the RCU Operator Control panel is always active to change mode control irrespective of the
Remote Control switch.
Remote Control ON/OFF
Switch
Fusesaver Operator
Control Panel Ignore
Remote Switch
Parameter
Mode Control by
Fusesaver Control
Panel
Mode will be forced to the Mode
defined in the Fusesaver policy file for
the Fusesavers which have levers
down
When Siemens Connect is in-session
(i.e. On the operate page) all other
sources of control are locked out.
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