ABB Feeder Protection and Control REF620E_1G NBFNAAAAAABC6BBN11G

REF620 is a dedicated feeder management

relay perfectly aligned for the protection,

control, measurement and supervision of

utility and industrial power distribution

systems, including radial, looped and meshed

networks, with or without distributed power

generation. REF620 can also be used to

protect feeders including motors or capacitor

banks. Additionally REF620 offers functionality

for interconnection protection used with

distributed generation like wind or solar power

connection to utility grid. Furthermore REF620

includes functionality for high-impedance

based busbar protection. REF620 is a member

of ABB's Relion® protection and control product

family and its 620 series. The 620 series relays

are characterized by their functional scalability

and withdrawableunit design. The 620 series

has been designed to unleash the full potential

of the IEC 61850 standard for communication

and interoperability of substation automation

devices.

The 620 series relays support a range of

communication protocols including IEC 61850

with Edition 2 support, process bus according

to IEC 61850-9-2 LE, IEC 60870-5-103. Modbus®

and DNP3. Profibus DPV1 communication

protocol is supported by using the protocol

converter SPA-ZC 302

Default configurations

The 620 series relays are configured with

default configurations, which can be used

as examples of the 620 series engineering

with different function blocks. The default

configurations are not aimed to be used

as real end-user applications. The end-users

always need to create their own application

configuration with the configuration tool.

However, the default configuration can be used

as a starting point by modifying it according to

the requirements.

REF620 is available in two alternative

default configurations: configuration A with

traditional current and voltage measurement

transducers and configuration B with current

and voltage sensors. Default configuration

A with measurement transducers has

more voltage measurements and I/Os

than default configuration B. This gives

more possibilities in applications supported

by default configuration A. The default

configuration can be altered by means of

the graphical signal matrix or the graphical

application functionality of the Protection and

Control IED Manager PCM600. Furthermore,

the application configuration functionality of

PCM600 supports the creation of multi-layer

logic functions using various logical elements,

including timers and flip-flops. By combining

protection functions with logic function blocks,

the relay configuration can be adapted to user

specific application requirements.

The basic configurations available in REF620

consist of a wide range of protection

functions making the protection relay

suitable for various basic feeder applications.

The relay offers directional and non

directional overcurrent and thermal overload

protection as well as directional and non

directional earth-fault protection. Admittance

based, harmonics-based or wattmetric-based

earth-fault protection can be used in

addition to directional earth-fault protection.

Furthermore, the relay features sensitive

earth-fault protection, phase discontinuity

protection, transient/intermittent earth-fault

protection, overvoltage and undervoltage

protection, residual overvoltage protection,

positive-sequence undervoltage protection and

negative-sequence overvoltage protection. In

addition, the relay offers frequency protection

including overfrequency, underfrequency and

frequency rate-of-change protection. The

relay also incorporates three-pole multi-shot

autoreclosing functions for overhead line

feeders.

The standard content additionally includes

multifrequency admittance-based earth-fault

protection providing selective directional

earth-fault protection for high-impedance

earthed networks. The operation is based

on multifrequency neutral admittance

3.

measurement utilizing fundamental frequency

and harmonic components in Uo and Io.

ABB’s continuous investments in research and a

close cooperation with customers have resulted

in the best earthfault protection portfolio

on the market. These functions are vital

with different physical neutral groundings. In

REF620. a special filtering algorithm enables

dependable and secure fault direction also

during intermittent/restriking earth faults. It

provides a good combination of reliability and

sensitivity of protection with a single function

for low ohmic and higher ohmic earth faults

and for transient and intermittent or restriking

earth faults.

REF620 is also capable of protecting other

applications than basic incoming or outgoing

feeders. The relay includes highimpedance

based busbar protection and measurement

circuit supervision functions which enable

the feeder relay to be used also for

busbar protection. The relay includes an

optional function package offering directional

active and reactive power protection that

enable the protected feeder to include also

motors. Additionally, the optional package for

capacitor bank protection includes functions

for capacitor bank overload, unbalance and

resonance protection enabling the protection

of single star (wye) connected capacitor banks

or double star (wye) connected capacitor

banks with isolated or compensated neutral.

Furthermore, the relay offers an optional