GE Multilin 489-P5-HI-A20-T-H Generator Management Relay for 489 Series

The 489-P1-LO-A20 is a model of Generator Management Relay (GMR)

manufactured by General Electric (GE).

A Generator Management Relay is a device that provides protection and

control functions for a generator in a power system. It is responsible for

monitoring various parameters, such as voltage, current, frequency, and

phase angle, to ensure that the generator operates within safe limits and

doesn't cause any damage to itself or the power system.

The 489-P1-LO-A20 GMR is a microprocessor-based relay that provides

advanced protection and control functions for generators.

Some of its key features include:

Overcurrent protection

Under/overvoltage protection

Under/overfrequency protection

Loss-of-field protection

Reverse power protection

Synchronization check

Automatic voltage regulator (AVR) control

Ethernet communication capabilities

This GMR model is designed for use in low-voltage applications and can be

used in a variety of generator types, including synchronous generators,

induction generators, and wind turbines. It is commonly used in power generation

facilities, industrial plants, and other applications where reliable generator protection

and control is critical.

The GE 469-P5-HI-A20-E-H is a type of protective relay manufactured

by General Electric (GE). Protective relays are devices that are used in

electrical power systems to detect abnormal conditions, such as

overcurrent or under/overvoltage, and to isolate the affected equipment

from the rest of the system to prevent damage or failure.

The GE 469-P5-HI-A20-E-H relay is a member of GE's Multilin 469 family

of relays, which are designed to provide comprehensive protection and

monitoring for power systems. This particular model is a high-impedance

differential relay, which means it is primarily used to protect transformers

and generators against internal faults.

The "469" in the name refers to the family of relays, the "P5" indicates 

that it is a high-impedance differential relay, the "HI" refers to the

high-impedance characteristics of the relay, and the "A20" indicates that

it has 20 current inputs. The "E" indicates that it has an Enhanced Display,

and the "H" indicates that it is conformally coated.

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