ABBDistributed busbar protection REB500 including line and transformer protection Product Guide

on the front of either the central unit or a bay 

unit. The optical interface is completely 

immune to electrical interference. The PC 

software facilitates configuration of the entire 

busbar protection, the set-ting of parameters 

and full functional checking and testing. The 

HMI500 can also be operated via the LON 

Bus on MicroSCADA for example, thus eliminating a separate serial connection to the central unit.

The HMI runs under MS WINDOWS NT, WINDOWS 98, WINDOWS 2000 and WINDOWS 

XP. The HMI500 is equipped with a comfortable on-line help function. A data base comparison function enables a detailed 

comparison between two configuration files 

(e.g. between the PC and the central unit or 

between two files on the PC).

Remote HMI

A second serial interface at the rear of the 

central unit provides facility for connecting a 

PC remotely via either an optical fiber, TCP/IP 

or modem link. The operation and function of 

HMI500 is the same whether the PC is connected locally or remotely.

Additional 

functionalities

Bay level functions

These functions are based on the well established and well-proven functions built in the 

ABB line and transformer protection. The bay 

level functions contain all the relevant additional functions, which are normally requested 

of a line and transformer protection scheme.

The line protection functions (L-V1 - L-V7) are 

used as Main 2 or back-up for lines as well as 

for transformer bays. The transformer protection functions (T-V1 - T-V4) are used as Group 

2 or back-up bay protection for transformer 

bays or as an independent T-Zone protection.

Distributed busbar protection REB500

including line and transformer protection

High-speed distance protection

• Overcurrent or underimpedance starters 

with polygonal characteristic

• Five distance zones (polygon for forwards 

and reverse measurement)

• Load-compensated measurement

• Definite time overcurrent back-up protection (short-zone protection)

• System logic

- switch-onto-fault

- overreach zone

• Voltage transformer circuit supervision

• Power swing blocking function

• HF teleprotection. The carrier-aided 

schemes include:

- permissive underreaching transfer tripping

- permissive overreaching transfer tripping

- blocking scheme with echo and transient blocking functions

• Load-compensated measurement

- fixed reactance slope

- reactance slope dependent on load 

value and direction (ZHV<)

• Parallel line compensation

• Phase-selective tripping for single and 

three-pole autoreclosure

• Four independent, user-selectable setting 

groups.

In the supervision mode the active and reactive power with the respective energy direction 

is displayed by the HMI500.

Autoreclosure

The autoreclosure function permits up to four 

three-phase autoreclosure cycles. The first 

cycle can be single phase or three-phase.

If the REB500sys autoreclosure function is 

employed, it can be used as a back-up for the 

autoreclosure realized externally (separate 

equipment or in the Main 1 protection).

When the autoreclosure function is realized 

outside of REB500sys, all input and output 

signals required by the external autoreclosure 

equipment are available in order to guarantee 

correct functionality.

Synchrocheck

The synchrocheck function determines the difference between the amplitudes, phase 

angles and frequencies of two voltage vectors. The synchrocheck function also contains 

checks for dead line and dead bus.

Transformer differential protection 

• For two- and three-winding transformers

• Auto transformers

• Three-phase function

• Current-adaptive characteristic

• High stability for external faults and current 

transformer saturation

• No auxiliary transformers necessary 

because of vector group and CT ratio compensation

• Inrush restraint using 2nd harmonic

The transformer differential protection function 

can also be used as an autonomous T-zone 

protection in a 1½ breaker scheme.

Thermal overload

This function protects the insulation against 

thermal stress. This protection function is normally equipped with two independently set 

levels and is used when oil overtemperature 

detectors are not installed.

Peak value over- and undercurrent protection

These functions are used for current monitoring with instantaneous response and where 

insensitivity to frequency is required.

Peak value over- and undervoltage protection

This function is used for voltage monitoring 

with instantaneous response and where insensitivity to frequency is required.

Frequency function

The function is used either as an over-/ underfrequency protection, or for load-shedding in 

the event of an overload. Several stages of 

the frequency protection are often needed. 

This can be achieved by configuring the frequency function several times.

Rate of change frequency protection df/dt

This function is used for the static, dynamic 

and adaptive load-shedding in power utilities 

and industrial distribution systems. The function supervises the rate-of-change df/dt of one