ABB REF 541 1MRS750443-MBG Feeder Terminal

ABB REF 541 1MRS750443-MBG Feeder Terminal

Features

• Feeder terminal for protection, control, measurement and supervision of medium voltage networks. 

• Voltage and current measurement via conventional measuring transformers or current sensors and voltage dividers. 

• Fixed human-machine interface including a large graphic display, or an external display module for flexible switchgear installation. 

• Protection functions including e.g. nondirectional and directional overcurrent and earth-fault protection, residual voltage, overvoltage and undervoltage protection, thermal overload protection, CBFP and auto-reclosing. 

• Control functions including local and remote control of switching objects with synchro-check, status indication of the switching objects and interlockings on bay and station level 

• Measurement of phase currents, phase-to phase and phase-to-neutral voltages, neutral current and residual voltage, frequency,  power factor, active and reactive power and energy. 

• Advanced power quality measurement capabilities. Total harmonic distortion (THD) measurements for both currents and voltages. Measurement for short duration voltage variations like sags, swells and short interruptions. 

• Condition monitoring including circuitbreaker condition monitoring, trip circuit supervision and internal self-supervision of the feeder terminal. 

• Time synchronization via binary input. Synchronization pulse once per second or once per minute. 

• Fault locator for short circuits in all kinds of network and for earth-faults in effectively earthed and low resistance/low reactance earthed networks.

• Additional functions including synchrocheck, frequency protection, capacitor bank protection and control. 

• RTD/analogue module for temperature measurement, current/voltage measurement and mA-outputs. 

• Communication over three communication interfaces: one for local communication with a PC and two for simultaneous dual port communication for e.g. a substation communication system and a substation monitoring system. 

• Selectable function block naming: ANSI device numbers, IEC symbols or ABB naming. 

• Support for IEC 61850 protocol through the SPA-ZC 400 adapter. 

• Support for Profibus-DPV1 protocol through the SPA-ZC 302 adapter 

• Part of the ABB Distribution Automation system.

Application

The REF 541, REF 543 and REF 545 feeder  terminals are designed to be used for 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..

Application area also covers protection functions for a large variety of applications, e.g.  frequency and voltage based protection,  motor protection, thermal overload protection, capacitor bank protection and synchrocheck/voltage check function.

In addition to protection, measurement, control and condition monitoring functions, the  feeder terminals are provided with a large  amount of PLC functions allowing several  automation and sequence logic functions  needed for substation automation to be integrated into one unit.

The REF 54_ feeder terminals incorporate a  wide range of feeder terminal functions:

• Protection functions 

• Measurement functions 

• Disturbance recorder 

• Power quality functions 

• Control functions 

• Fault locator 

• Condition monitoring functions 

• General functions 

• Communication functions 

• Standard functions

Disturbance recorder

The transient disturbance recorder is able to  record 16 current or voltage waveforms and  16 logic digital signals. The sampling frequency of the analogue inputs is 2 kHz at the  rated frequency of 50 Hz and 2.4 kHz at the  rated frequency of 60 Hz.

The user can set the length of a recording  within a range determined by the number of  analogue inputs used. The number of recordings depends on the sampling frequency,  length of recordings and number of analogue  inputs.

The recordings can be uploaded with a DRCollector Tool which converts the data to a  COMTRADE format. The DR-Collector Tool  is supported in CAP501 and CAP505 relay  tools.

General functions

Additional functions are available for different general purposes to be used in logics such  as activation of HMI backlight, switchgroups,  and resetting of operation indications, latched  output signals, registers and disturbance  recorder.