ABB RET670 1MRK002246-BD Transformer protection RET670 ANSI

Protection functions

The IED offers directional and non-directional overcurrent and thermal overload protection as

well as directional and non-directional earth-fault protection. 

Some standard configurations allow as an option admittance-based, harmonics-based or wattmetric-based earth-fault protection to be

used in addition to directional earth-fault protection. 

Further, the IED features sensitive earth-fault protection, phase discontinuity protection, transient/intermittent earth-fault protection, 

overvoltage and undervoltage protection, residual overvoltage protection, positive-sequence undervoltage 

and negativesequence overvoltage protection. 

Frequency protection, including overfrequency, underfrequency and frequency rate-of-change protection,

is offered in IEDs with standard configurations H and J. 

The IED also incorporates optional three-pole multi-shot auto-reclose functions for overhead line feeders.

Enhanced with optional hardware and software,the IED also features three light detection channels 

for arc fault protection of the circuit breaker, busbar and cable compartment of metalenclosed indoor switchgear.

The arc-fault protection sensor interface is available on the optional communication module.

Fast tripping increases staff safety and security and limits material damage in an arc fault situation.

REF542plus success story

„ Market launch 2000

„ Delivered units approx. 50,000

„ Applications ranging from low voltage to high voltage

„ In service worldwide

„ Many different protection and control functions

Event recording

All events are stored with a resolution of 1 ms in the central unit and in the BUs.

System, protection and test events can be generated.

Protection events refer to the protected busbar and include the changes in the disconnector and breaker positions,

trips, etc. Test events are recorded during testing with the test signal generator.

System events describe the diagnostic and fault messages of the NBP system as a whole.

Product features

• Motor protection with voltage- and frequency-based protection and measurement functionality

• Motor protection both during motor start-up and normal run, with protection and fault clearance in abnormal situations as well

• Optional arc protection and high-speed outputs

• Supports IEC 61850 Editions 1 and 2, including HSR and PRP, GOOSE messaging and IEC 61850-9-2 LE for less wiring and supervised communication

• IEEE 1588 V2 for high-accuracy time synchronization and maximum benefit of substation-level Ethernet communication

• Supports Modbus, DNP3 and IEC 60870-5-103 communication protocols

Product benefits

• Compact and versatile solution for utility and industrial power distribution systems with integration of protection, control, monitoring and supervision in one relay

• Motor protection with motor start-up and loss of load supervision as well as thermal overload,

  motor load jam and phase-reversal protection, either with sensors or conventional instrument transformers

• Ready-made standard configurations for fast and easy setup with tailoring capabilities

• Withdrawable plug-in unit design for swift installation and testing

• Large graphical display showing customizable SLDs, accessible either locally or through an easy-to-use web-browser-based HMI

• Extensive life-cycle services