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4.
Functions
REF 542plus switchgear protection and control unit integrates all secondary
functions in a single unit. This multifunctional unit features also a self-monitoring
function. All functions are designed as freely configurable software modules.
Therefore, a wide range of operation requirements in MV stations can be met
without any problems. The versatility of the software makes it possible to use the
REF 542plus on every switchgear irrespective of the specific application required.
4.1.
Configuration
The REF 542plus unit is configured for the specific application using the Operating
Tool running on a personal computer. With the graphical editor, the needed
functions blocks are combined together. The available protection functions are
represented with specific function blocks, which can be combined with logic
function to define the required protection and automation scheme. The flexibility of
REF 542plus is advantageous for defining control functions and automation
sequences which can, for example, include the interlocking of the switching devices,
blocking the release of specific protection functions, as well as starting switching
sequences.
The REF 542plus unit provides a wide range of logical functions so that each
specific requirement can be met. The functions include logical gates such as AND,
OR, timers, counters, pulse generators, flip-flops and so on. All functions in the
switchgear are specified in collaboration with ABB. The REF 542plus configuration
is a file, which is then downloaded into the unit via the optical serial port on the
HMI. The Operating Tool allows also these additional functions, once connected to
the HMI via the serial cable:
*
Protection functions setting
*
Measurement values read-out
*
On-line binary inputs and outputs status read-out
*
Fault recorder data acquisition
The Operating Tool allows on line, real time monitoring of the internal control
signals and logic states, a powerful tool for application debugging.
The specific software configuration of the required protection scheme
can only be carried out in-house at ABB.
4.2.
Measurement
REF 542plus can have a maximum of 8 analog input channels for measuring current
and voltage signals. These channels are organized into three groups.
Multifunction Protection and Switchbay Control
Unit
Technical Reference Manual
REF 542plus
REF 542plus
1MRS755859
