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Technical Reference Manual, General
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The REF 54_feeder terminals are designed to be used for the protection, control,
measurement and supervision of medium voltage networks. They can be used with
different kinds of switchgear including single busbar, double busbar and duplex
systems. The protection functions also support different types of networks such as
isolated neutral networks, resonant-earthed networks and partially earthed networks.
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The functionality available for REF 54_ depends on the selected functionality level
(refer to section “Ordering Information” on page 88) and is also tied to the hardware
configuration. The desired functions can be activated from a wide range of
protection, control, measurement, power quality, condition monitoring, general and
communication functions within the scope of I/O connections, considering the total
CPU load. Compared to the traditional use of separate products, the combination of
desired functions provides cost-effective solutions and, together with the relay
configuration (IEC 61131-3 standard), allows the REF 54_ feeder terminals to be
easily adapted to different kinds of applications.
By means of the graphic HMI display, the control functions in the feeder terminal
indicate the status of disconnectors or circuit breakers locally. Further, the feeder
terminal allows status information from the circuit breakers and the disconnectors to
be transmitted to the remote control system. Controllable objects, such as CBs, can
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