The Multilin™ 889 Generator Protection System is an advanced generator protection system from GE Grid Solutions that is part of the Multilin 8 Series protective relay platform. It is designed for the protection, control and management of generators and their associated unit transformers in critical utility and industrial applications. The 889 system goes beyond asset protection to provide power system engineers with the data, measurement accuracy and visibility needed for total generator management. These advanced asset monitoring capabilities enable engineers to make informed, proactive decisions that enable planned maintenance activities and reduce costs associated with pre – and post-failure analysis, equipment damage, and unplanned or extended downtime.

The 889 system offers advanced automation features, including logic programming, communication, and SCADA equipment, that go beyond the scope of most generator protection relays. It provides an easy-to-use graphical interface for defining and creating operation and control logic. FlexLogic™ is a powerful programming logic engine that allows the creation of customized protection and control schemes, minimizing the need and associated costs for auxiliary components and wiring. With FlexLogic™, the 889 can be programmed to provide the required tripping logic as well as custom scheme logic for circuit breaker control (including external inputs for interlocking), interlocking schemes with adjacent protection (for example, sympathetic tripping against healthy feeders), and dynamic set group changes.

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In addition, the 889 system provides a range of advanced monitoring and diagnostic tools to help operators and engineers extend the life of critical power system assets. These tools include the ability to measure and record all AC signals with high accuracy, integrated digital fault logging, and pre-formatted asset health reports. The system also provides specialized generator system monitoring and control, including frequency-based turbine maintenance scheduling, harmonic detection, overspeed monitoring, etc.

In terms of communication, the Multilin 8 Series provides advanced communication technology with support for fiber optic Ethernet, providing high bandwidth communication, allowing low latency control and high-speed file transfer relay fault and event recording information. The 8 Series also supports two independent IP addresses, providing a high degree of flexibility for the most challenging communication networks. The 8 Series supports multiple Ethernet and serial port options and supports a wide range of industry-standard protocols for easy and direct integration into DCS and SCADA systems.

In summary, the Multilin 889 generator protection system is a comprehensive solution that provides advanced technology and capabilities for the protection, control and management of generators and related equipment.