4 Control of Switchgear
4.1 Fusesaver
The Fusesaver has multiple sources of control for Tripping, Closing and changing Protection Mode
as follows:
TRIP/CLOSE levers on the Communications Module (refer to Fusesaver Operating Instructions
KMS-0017 for more details)
Siemens Connect utility running on a PC equipped with a USB antenna module (refer to
Fusesaver Operating Instructions KMS-0033 for more details)
SCADA operator via the RCU
Operator control panel if fitted to the RCU.
Controls generated from the RCU itself based upon condition criteria
This section provides details on the protection mode functionality that is possible via the RCU and
the various means by which these controls can be asserted.
4.1.1 Methods of Asserting Controls
4.1.2 SCADA Operator Controls
The purpose of the RCU is to allow a remote operator to connect through the RCU to the Fusesavers
to receive events and to apply controls. The availability of these events and controls is determined
by the type and implementation to the utility SCADA system. Refer to the relevant Protocol Manual
for information on the event types and controls supported by the RCU for your protocol. It is the
user’s responsibility to engineer the SCADA interface required to manage RCU’s in the field.
The SCADA control centre will be able to perform the following functions:
1 View RCU status and event information.
2 Issue trip and close commands to the Fusesavers via the RCU. The RCU must have
Remote Control Switch set to ON for this to be possible.
3 Change protection modes in the Fusesaver via the RCU. RCU must have Remote
Control Switch set to ON for this to be possible.
4 Issue a command to the Fusesavers to force the protection to be armed regardless of
whether there is adequate line current to power the Fusesavers as in normal operation.
The protection will remain armed until a command to disable the “forced” arming is
received or a time limit that is set by the Fusesaver policy file is reached
Control by the SCADA operator of Fusesaver Trip, Close, protection mode and forced protection
arming is enabled when the Remote Control Switch is ON and disabled when the Remote Control
Switch is OFF.
It is possible to configure the RCU so that SCADA trip is always accepted, refer “Always Allow Trip”
setting in the relevant protocol manual.
SCADA control of the Fusesaver dummy control is always allowed.
4.1.3 Fusesaver Operator Control Panel Controls
Control by the Fusesaver Control panel (refer page 19) for Fusesaver Trip, Close and protection
mode is enabled when the Remote Control Switch is OFF and disabled when the Remote Control
Switch is ON however it is possible to configure the RCU so that the Operator Control panel is always
able to control the Fusesaver irrespective of the Remote Control Switch. This is detailed on page
98.
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