ABB 分布式母线保护 REB500

ABB Distributed Busbar Protection REB500

DESCRIPTION

The numerical busbar protection REB500 is  designed for the high-speed, selective protection of MV, HV and EHV busbar installations  at a nominal frequency of 50, 60 and 16.7 Hz.

The structure of both hardware and software  is modular 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 busbars to  quadruple busbars with transfer buses, ring  busbars and 1½ breaker schemes to be protected.

In 1½ breaker schemes the busbars and the  entire diameters, including Stub/T-Zone can  be protected. An integrated tripping scheme  allows to save external logics as well as wiring.

Main features

• Low-impedance busbar protection 

• Stub and T-zone protection 

• High functional reliability due to two independent measurement criteria: - stabilized differential current algorithm - directional current comparison algorithm 

• Phase-by-phase measurement 

• Reduced CT performance requirements 

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

• Full solid-state busbar replica 

• No switching of CT circuits

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

• Centralized layout: Installation of hardware  in one or several cubicles 

• Distributed layout: Bay units distributed  and, in the case of location close to the  feeders, with short connections to CTs, isolators, circuit breakers, etc.

• fiber-optic connections mean interferenceproof data transfer even close to HV power  cables 

• Replacement of existing busbar protection  schemes can be accomplished without restrictions (centralized layout) in the case of  substation extensions e.g. by a mixture of  centralized and distributed layout

• User-friendly, PC-based human machine  interface (HMI) 

• Fully numerical signal processing 

• Comprehensive self-supervision 

• Binary logic and timer in the bay unit 

• Integrated event recording 

• Integrated disturbance recording for power  system currents 

• A minimum of spare parts needed due to  standardization and a low number of varying units

Options 

• Breaker failure protection (also separately  operable without busbar protection) 

• End fault protection 

• Definite time overcurrent protection 

• Breaker pole discrepancy 

• Current and voltage release criteria 

• Disturbance recording for power system  voltages 

• Separate I0 measurement for impedance grounded networks 

• Communication with substation monitoring  and control system (IEC 61850-8-1 / IEC 60870-5-103 / LON) 

• Internal user-friendly human machine interface with display 

• Redundant power supply for central units  and/or bay units