REF542plus | ABB | Multifunction Protection Switchbay Control Unit

Description

REF542plus | ABB | Multifunction Protection Switchbay Control Unit

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The REF542plus is based on a real-time microprocessor system. The measurement and protection functions are executed by a Digital Signal Processor (DSP), while a Micro Controller (MC) is executing the control functions. Due to this task separation there is no impact between the start and the trip behavior of the implemented protection scheme, should the control scheme be modified. The Communication Processor (CP) is needed for connection to a station automation system. A block diagram of the REF542plus is shown in figure 3.

REF542plus, as shown in figure 3, consists of two parts, a Central Unit and a separate Human Machine Interface (HMI). The Central Unit contains the power supply, processor and analog and binary Input and Output (I/O) modules, as well as optional modules for supplementary functions. The HMI Control Unit is a stand-alone unit with its own power supply. It can be installed
on the Low Voltage (LV) compartment door or in a dedicated compartment close to the Central Unit. The HMI is normally used to set the protection parameters and to locally operate the switching devices in the switchbay. The HMI is connected to the Central Unit by a shielded, isolated twisted pair according to the RS485 interface. Figure 4 shows an installation of the Central Unit and the HMI Control Unit in the LV compartment of a switchboard for the switchbay.

The HMI Control Unit, as shown in figure 5, features a back-illuminated Liquid Crystal Display (LCD), eight push buttons, several LEDs and an electronic key interface. The language of the display can be selected via the related configuration software tool, which is also used to define the protection and the control scheme.

Mailbox：sauldcsplc@gmail.com |ABB REF542plus
www.abbgedcs.com | Qiming Industrial Automation| Simon +86 13822101417