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ABB Microprocessor-based Relay Protection

Optical access and telecom site reference Published 03 Mar 2025

Use this reference to prepare product questions for CGWEB NETWORKS. Check interfaces, capacity, protection and installation requirements against the current product documentation.

ABB microprocessor-based relays are programmable, multifunctional devices that provide advanced protection and control for electrical power systems. OverviewABB's microprocessor-based relays, first introduced in 1985, are designed to monitor, protect, and control electrical networks autonomously, ensuring safe and reliable power distribution. Unlike conventional electromechanical or static relays, which have fixed wiring and manual settings, microprocessor-based relays are programmable, allowing users to configure protection characteristics, operating curves, and multifunctional features according to system requirements.

Key Features

Programmable and Multifunctional: Users can set protection parameters, time-current characteristics, and logic functions digitally.

Self-

Powered Options: Certain models, like the MICRO-51, operate directly from current transformers without continuous control voltage, reducing energy consumption. Phase and Ground Protection: MICRO-51 relays provide both phase and ground overcurrent protection for utility, industrial, and commercial systems.

Self-

Checking and Reliability: These relays perform internal diagnostics to ensure proper operation and reduce maintenance needs. Flexible Settings: They offer multiple selectable curves and adjustable settings to match system protection requirements. ApplicationsABB microprocessor-based relays are widely used in: Utility Networks: Supervising electricity distribution and preventing faults from propagating.

Industrial and Commercial Systems: Protecting motors, transformers, and feeders from overcurrent and short circuits. Integration with Smart Grids: Supporting renewable energy sources and distributed generation while maintaining network stability. Example: MICRO-51 RelayThe MICRO-51 is a microprocessor-based time-overcurrent relay that: Operates from conventional 5A or 1A secondary current transformers.

Is self-powered and self-checking, with front-panel switch settings for easy configuration. Provides multiple selectable curves for overcurrent protection, making it suitable for diverse network conditions.

Advantages Over Conventional Relays

Programmability allows for precise and adaptable protection schemes. Multifunctionality reduces the need for multiple separate relays. Enhanced reliability through self-diagnostics and digital processing.

Energy efficiency in self-powered models. ABB's microprocessor-based relays, including the Relion® family and legacy models like MICRO-51, play a critical role in modern power systems by ensuring safety, stability, and efficient operation across utility and industrial networks.

ABB Microprocessor-based Relay Protection - CGWEB NETWORK INFRASTRUCTURE [PDF]

ABB Microprocessor-based Relay Protection
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