3 Description
3.1 RCU principle
The Remote Control Unit (RCU) is an outdoor device. The RCU works in partnership with Siemens
switchgear (Fusesaver or CMR) to increase network automation by allowing the utility control centre
to be able to remotely monitor and control the switchgear. .
Additionally, the RCU can be equipped with an operator panel to enable local operator control of the
switchgear. Operator Panel controls can trip and close the switchgear and change its protection
mode..
Siemens switchgear is equipped with a short range radio (approx 20 m) to allow configuration and
control. In order to connect the switchgear into a utility SCADA system a Remote Control Unit (RCU)
is required. For understanding of switchgear operation, refer to the relevant switchgear manual [6]
[2] .
The RCU is a pole mounted enclosure containing a microprocessor, a short range radio and a long
range radio (or modem). The microprocessor retrieves data from the switchgear using the short
range radio and sends it to the SCADA system using the long range radio. Incorporated into the
RCU is a power supply system with a standby battery and provision for mains or solar power.
This manual describes in detail the functions, configuration and maintenance of the RCU. The
intended users of this manual are the utility SCADA, operations and maintenance staff.
Fig. 2 Installation of RCU with Fusesavers
1 Conductor
2 Fusesaver
3 Communications Module
4 Fuse or isolating link
5 Remote Control unit
6 Earth Connection
7 Mains Connection
8 Antenna for long range communications
The design and testing of the Remote Control Unit is according to the relevant parts of IEC 60950-
1:2005 Information technology equipment – Safety.
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