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)
- User name Member Level Quantity Specification Purchase Date
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