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ABB Distributed busbar protection REB500

From: | Author:Wang | Time :2025-04-11 | 29 visit: | Share:

ABB Distributed busbar protection REB500

Product Overview: REB500 is a digital busbar protection device for high-speed, selective protection of medium-voltage (MV), high-voltage (HV) and ultra-high-voltage (EHV) busbars, on which REB500sys integrates line and transformer protection functions, suitable for a variety of busbar configurations and power supply systems.


Main features: low impedance busbar protection technology, with dual independent measurement standards, phase-to-phase measurement, low performance requirements for current transformers (CT), and high resistance to CT saturation. There are centralised, distributed and hybrid installation modes, connected by optical fibre, data transmission is anti-interference and easy to expand. With user-friendly PC human-machine interface (HMI), comprehensive self-monitoring functions, integrated event and disturbance records, low spare parts requirements, support for a variety of communication protocols.


Application Scenario: Suitable for 50Hz, 60Hz and 16.7Hz MV, HV and EHV substations, protecting various busbar configurations and line and transformer feeders. A wide range of fault types can be detected, and protection schemes can be simplified or optimised according to different network voltage levels and protection concepts.

System design: consists of a spacing unit (500BU03) and a central unit (500CU03). The interval unit is responsible for data acquisition, pre-processing, control and interval protection functions, is electrically insulated, can operate independently, and has a variety of analogue inputs and binary I/O configurations; the central unit serves as the system manager and is responsible for the system configuration, data processing, and communication control, and the modules have plug-and-play functionality.


Functions: Busbar protection is based on stable differential current measurement and directional current comparison algorithms for fast and accurate fault detection. It also has various functions such as circuit breaker failure protection, terminal fault protection, overcurrent protection, etc., which can ensure the reliability and selectivity of the protection action through a variety of criteria and logic. The event and disturbance recording function can record the system operation data in detail, and the communication interface supports various protocols, which is easy to integrate with the substation monitoring system.


Technical data: There are clear requirements for fibre optic cables, isolator auxiliary contacts, circuit breaker replicas and main CTs. The products meet the relevant standards in terms of temperature, climate, electromagnetic compatibility, etc., with detailed technical parameters of hardware and software modules, such as analogue inputs, binary I/O, auxiliary power supply, etc.


Connection diagrams and installation: Connection diagrams for the central unit and the spacer units are provided, showing how the various input and output interfaces are connected. The products are available in different mounting versions, with clear mechanical design parameters such as dimensions and weights of the spacer units and the central unit, as well as corresponding specifications and requirements for cabinet mounting.



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