ABB Distributed busbar protection REB500

Application

REB500

The numerical busbar protection REB500 is designed for the high-speed (sub-cycle), selective protection of MV, HV

and EHV busbar installations at a nominal frequency of 50, 60 Hz The modular system structure is enabling the protection to

be easily configured to suit the layout of the primary system.

The flexibility of the system enables all configurations of busbars from single to quadruple, with transfer buses or

ring busbars and 1½ breaker schemes to be protected.

In 1½ breaker schemes the busbars and entire diameters, including Stub/T-Zone can be protected. 

An integrated tripping scheme allows saving external logics as well as wiring.

The system is scalable for up to 60 feeders (bay units) and a total of 32 busbar zones.

The numerical busbar protection REB500 detects all phase and earth faults in solidly grounded and resistivegrounded power systems and phase faults in ungrounded

systems and systems with Petersen coils.

The main CTs supplying the currents to the busbar protection have to fulfill only modest performance

requirements (see page 17). The protection operates discriminatively for all faults inside the zone of protection

and remains reliably stable for all faults outside the zone of protection.

REB500 bay protection (optional)

The system provides an option to extend the functional scope of REB500 by a set of predefined bay protection

functions used as main 2 or back-up line protection.

Version ‘Line variant L-V2’ includes distance, directional/non directional overcurrent and directional earthfault protection functions (see Table 2).

As regards the level of voltages and frequencies busbar and station protection have the same application area.

For details on application and technical data refer to the REB500 Application Manual for bay protection functions.

Main features

Low-impedance busbar protection

· High functional reliability due to two independent measurement criteria:

- stabilized differential current algorithm

- directional current comparison algorithm

· Short tripping times independent of the plant’s size or busbar configuration

· Phase Segregated measurement

· Stub and T-zone protection

· Reduced CT performance requirements

- High through-fault stability even in case of CT saturation

- No switching of CT circuits

Modular and flexible architecture

· Multiple modes of installation

- Centralized layout:

Installation of bay units and central unit in one or several cubicles

- Distributed layout:

Bay units distributed with short connections to CTs,isolators, circuit breakers, etc.

· Interference-proof connections between bay units and central unit by fiber-optic cables (max. 2000m)

· Replacement of existing busbar protection schemes without restrictions e.g. in case of substation extensions

· Easily extensible

· Only one hardware version for

- Settable 1A and 5A rated current inputs

- Nominal frequencies of 50Hz and 60Hz

· Minimum number of spare parts needed due to standardization and low number of varying units

Seamless substation automation integration

· User-friendly, PC-based interface (HMI)

· Operator integration into PCM600 for readout of configuration, events and disturbance records.

· Communication with substation monitoring and control system

- via IEC 61850-8-1 Edition 1 or Edition 2

- via IEC 60870-5-103

· Local HMI with comprehensive system information on every unit

· Fully numerical signal processing

· Comprehensive self-supervision

· Integrated event recording

· Integrated disturbance recording for power system currents and voltages

· Optional redundant power supply for central units

Cyber security

· Secure communication

· User Access Management

· User Activity Logging

· Centralized account management

· Verified robustness

Additional options

· Breaker failure protection

· Check-zone protection

· End-fault protection

· Definite time overcurrent protection

· Breaker pole discrepancy protection

· Current and voltage release criteria for busbar protection

· Separate I0 measurement for impedance-grounded networks

· Advanced user configurable logic capability