ABB RET620 NCTNAAAANDCBNNIXF Transformer protection and control

Application

REF610 is a versatile multifunction protection relay mainly designed for protection

of incoming and outgoing feeders in MV distribution substations. 

The relay can also be used as back-up protection for motors, transformers and generators,

in industrial as well as in utility applications.

The large number of integrated protection functions, including three-stage

overcurrent protection, two-stage, non-directional earth-fault protection as well as

thermal protection, makes the relay a complete protection against overcurrent and earth faults.

The optional arc protection for detection of arc situations in air insulated metal-clad

switchgears and the auto-reclose function for automatic clearing of overhead line

faults increase the range of applications further.

The large number of digital inputs and output contacts allows a wide range of applications.

About REB500

REB500 distributed busbar protection belongs to the Relion protection and control product family. 

The product is designed to provide the core values of the IEC 61850 standard. 

REB500 supports different busbar protection philosophies. 

A distributed solution can be made by assigning each physical bay unit into the corresponding bay cubical. 

Alternatively, bay units can be integrated into centralized cubicles.

New features and benefits

The following new features and their benefits are introduced in this update:

Line distance protection for series compensated lines is now improved by an extremely fast transient direction detection 

based on the well proven RALDA principles. 

The high speed fault detection from both line ends together with scheme communication enables fast fault clearance.

REL670 now includes increased number of functional instances whereby protection of two 

overhead lines (one as main and another as backup) can be achieved using a single IED.

RET670 now includes a state-of-the art differential protection for phase-shifting transformers.

In terms of solution, the complex phase-shifting transformer is seen as a single unit and only external CTs and VTs will be required. 

The differential protection is self-adaptive to the phase angle and voltage ratio thereby making it extremely simple to configure, set and deploy.

The single phase and three phase circuit breaker failure protection are now updated with a flexibility of having several different initiation conditions.

REC670 now includes 12 instances (from earlier 6 instances) of high-impedance differential protection functions. 

This increase will now allow coverage of applications with a higher number of zones using one single IED.

All 670 series products now include current/voltage/general delta supervision functionality. 

These can be used for delta calculation including vector shift calculation using instantaneous/RMS magnitudes for usage in applications like comparators or release conditions.

All 670 series products now include current/voltage harmonic monitoring functionality. 

These functions are useful to monitor the harmonic distortion, up to 5th harmonic, total harmonic distortion and total demand distortion.

Product benefits

The compact design makes it suitable for both new and retrofit installations

Quick and easy routine maintenance thanks to the removable plug-in design

Complete type test certified by KEMA

Certificated for marine and off-shore use by Det Norske Veritas (DNV)

REF610 is a member of ABB’s Relion® product family and part of its 610 product series. 

The series includes protection relays for feeder protection, motor protection and general system voltage supervision. 

The plug-in design facilitates the commissioning of the switchgear and enables fast and safe insertion and withdrawal of protection relay plug-in units.

REF610 is primarily intended for the protection of incoming and outgoing feeders in distribution substations of 

resistance earthed and solidly earthed power systems. 

REF610 is suitable for employment in marine and off-shore environments. 

Supplied with an optional arc protection function REF610 also provides fast substation busbar arc-fault protection.