ABB REF 542plus 1MRS756269 Feeder Terminal

ABB REF 542plus 1MRS756269 Feeder Terminal

Features

• Real-time multifunction protections and  switchgear controls: 

- protections 

- fault locator 

- measurements 

- controls 

- monitoring and diagnosis 

- power quality functions 

- communication 

- self diagnosis 

• Task separation for implemented protections and control scheme modifications 

• Flexible installation variations due to separated HMI and base unit 

• Large multilingual LCD display for singleline diagram, text messages and menu  texts 

• Calculated primary quantities include: 

- maximum and mean currents in the settable monitoring period 0-30 min 

- sum of interrupted currents 

- operating time 

- number of switching cycles 

• Spring charging time supervision

• Trip coil supervision 

• Binary input and output modules to interface with external processes 

• Analog input module for primary current  and voltage signals: 

- analog transformers 

- non-inductive sensors 

• Life Cycle Traceability 

• Optional analog input module 4-20 mA 

• Optional analog output module 0(4)-20 mA 

• Optional communication module for the  substation automation system 

• Ethernet interface for embedded web  server 

• Optional optical input port for time synchronization 

• Part of the ABB Distribution Automation  system

General

The Feeder Terminal REF 542plus is a compact protection, control, measurement and  supervision terminal for the power distribution system. The same terminal can be used  for feeder, transformer and motor protection  and control, or solely for switchgear control.  The terminal features an impressive range of protection and management functions readily  available for adapting the unit to the intended  application.

Application

Monitoring and self-diagnosis The REF 542plus offers several features for  monitoring the primary part as well as selfdiagnosis. The following computed quantities  are available for primary part monitoring: 

• maximum and mean currents in the observation period (0 ... 30 min) 

• sum of interrupted currents 

• operating time 

• number of switching cycles (open-close  circuit breaker) 

• spring charging time supervision (when  applicable) 

• trip coil supervision 

The REF 542plus is equipped with self-diagnosis routines that constantly check the hardware and software modules status. Every  REF 542plus binary input and output module  is equipped with a watchdog contact that triggers in case of fault or power loss. This contact can be used to detect unit failure and to  initiate the appropriate actions. Analog input  channels can be optionally supervised. A broken wire in the connection with an instrument  transformer or a sensor can be detected and  an alarm can be activated.

Protection

REF 542plus offers a wide range of functions  for protection. As previously mentioned, a  wide range of protection schemes for the protection of several system components can be  configured. The available protection functions depend on the ordered software  licenses. The licenses are Basic Low, Basic,  Multi Low, Multi, Differential and Distance.  In table 20 the corresponding provided protection functions are listed.

Current protection: 

• inrush blocking (68) 

• overcurrent instantaneous (50) 

• overcurrent definite time, 2 thresholds  (51) 

• overcurrent directional, 2 thresholds (67) 

• overcurrent IDMT (51 IDMT) 

• overcurrent with free programmable trip  characteristic 8 thresholds (51) 

• overcurrent directional with free programmable trip characteristic 8 thresholds (67) 

• earth fault, 2 thresholds (51N) 

• earth fault IDMT (51 IDMT) 

• earth-fault directional, 2 thresholds (67N) 

• earth-fault directional sensitive (67S) 

• earth-fault directional sector (67NS), 10 thresholds 

• earth-fault with free programmable trip  characteristic 8 thresholds (51) 

• earth-fault directional with free programmable trip characteristic 8 thresholds (67) Voltage protection: 

• overvoltage instantaneous (59) 

• overvoltage definite time, 2 thresholds  (59) 

• undervoltage Instantaneous (27) 

• undervoltage definite time, 2 thresholds  (27) 

• residual overvoltage, 2 thresholds (59N)