FI830F ABB distributed control system industrial DCS module card

Description

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The SACE PR122 trip unit is a sophisticated and flexible protection system based on a state-ofthe art microprocessor and DSP technology. Fitted with the optional internal PR120/D-M dialogue unit, PR122/P turns into an intelligent protection, measurement and communication device, based on the Modbus® protocol. By means of the PR120/D-M, PR122/P can also be connected to the ABB EP010 Fieldbus plug adapter, which makes it possible to choose among
several different networks, such as Profibus and DeviceNet.
The new PR122/P is the result of ABB SACE’s experience in designing protection trip units.
The exhaustive range of settings makes this protection unit ideal for general use in any type of
installation, from distribution to the protection of motors, transformers, drives and generators.
Access to information and programming using a keyboard and graphic liquid crystal display is
extremely simple and intuitive. The interface is now common to PR122/P and PR123/P in order to
give to the user maximum ease of use.
An integrated ammeter and many other additional features are provided over and above the
protection functions. These additional functions can be further increased with addition on board
of the dialogue, signalling, measurement, and wireless communication units.
Functions S and G can operate with a time delay independent of the current (t = k) or with an
inverse time delay (constant specific let-through energy: I2
t = k), as required.
Protection against earth faults can also be obtained by connecting the PR122 trip unit to an
external toroid located on the conductor that connects the transformer star centre to earth (homopolar toroid).
All the thresholds and trip curve delays of the protection functions are stored in special memories which retain the information even when no power is supplied