ABB REF542plus SACE750090R0002 Multifunction Bay Control Relay

ABB REF542plus SACE750090R0002 is a multifunctional bay control and protection terminal for medium voltage switchgear. It integrates protection, measurement, switchgear control, monitoring and self-diagnosis functions, widely used for feeder, transformer and motor bay protection in power distribution systems.

This relay supports rich protection logics including overcurrent, earth fault, undervoltage and overvoltage, with built-in auto-reclosing and busbar backup functions. It is equipped with LCD HMI and Ethernet communication, supporting IEC 61850 and other substation communication protocols, used as spare parts for power plant and substation switchgear maintenance.

Main Specifications

1. Brand: ABB; Model: REF542plus, SACE750090R0002; Type: Bay control & multifunction protection relay
2. Application: Medium voltage switchgear, feeder, transformer, motor protection and bay control
3. Core Functions: Overcurrent/earth fault protection, voltage protection, measurement, bay control, auto-reclosing, self-diagnosis
4. Communication: Ethernet, optical time sync; Protocols: IEC61850, Modbus, IEC 60870-5-103
5. Display: Multilingual LCD HMI; I/O: Configurable binary input / output modules, optional analog modules
6. Operating Temperature: -25℃ ~ +70℃; Panel mounting for switchgear cabinet
7. Supply Status: Original ABB spare protection relay for substation and power distribution cabinet overhaul

Core Functions

1. Provide full set of protection functions including instantaneous and time-delayed overcurrent, directional earth fault, under/overvoltage protection.
2. Support programmable auto-reclosing with up to 5 reclosing shots for medium voltage feeder fault recovery.
3. Realize switchgear bay control: circuit breaker on/off control, spring charging supervision and trip coil monitoring.
4. Measure electrical parameters such as current, voltage, power and energy, record fault event and disturbance data.
5. Built-in web server and multi-protocol communication for data interaction with substation SCADA automation system.
6. Panel mounted design, equipped with local HMI for parameter setting, fault checking and on-site operation.

Application Scenarios

1. Bay protection and control unit for medium voltage switchgear in power substations, industrial plants and renewable energy stations.
2. Fault relay replacement and routine maintenance of existing ABB REF542plus power distribution automation systems.
3. Power system renovation projects for feeder, transformer and motor protection in mining, chemical and metallurgy industries.
4. Emergency replacement for relay failure to restore protection tripping, bay control and electrical measurement functions.
5. Spare parts stocking for maintenance teams operating medium voltage switchgear and substation automation platforms.
6. Aftermarket spare supply for switchgear cabinet overhaul and substation digital transformation projects.

FAQ

1. Q: Can REF542plus support IEC61850 communication?
   A: Yes, it supports IEC61850 together with IEC 60870-5-103 and Modbus protocols for substation automation.
2. Q: What are typical relay failure symptoms?
   A: Blank HMI screen, protection blocking, loss of SCADA communication, abnormal fault recording and alarm.
3. Q: How to complete commissioning and diagnosis?
   A: Install relay on cabinet door, connect CT/PT and binary circuits, set protection parameters and test protection trip logic.