GE Multilin The Generator Management Relay 489-P1-LO-A20

GE  Multilin The Generator Management Relay 489-P1-LO-A20

About the 489-P1-LO-A20

489-P1-LO-A20 is a Multilin 489 generator management relay that is manufactured by GE Multilin. This generator relay has 1 A phase CT secondaries. The LO control power is 20-60 VDC and 20-48 VAC at 48-62 Hz. The analog outputs on this relay are 4 to 20 mA. This relay has a basic display. This generator management relay does not have a protective conformal coating to protect against chemical environments. If you have any questions about this part, please contact AX Control.

The trip protection features on the relay include electrical lockout analog inputs 1 to 4. thermal overload, RTDs (stator, bearing, ambient, other), low forward power, reverse power for anti-motoring, reactive power (kvar) for loss of field, distance element (2 zones of protection), loss of excitation (2 impedance circles), neutral Undervoltage (3rd harmonic), neutral overvoltage (fundamental), over frequency (two-step), under frequency (two-step), high-set phase overcurrent, ground directional, percentage phase differential, ground overcurrent, negative-sequence overcurrent, phase overcurrent with voltage restraint, inadvertent energization, offline overcurrent protection during startup, and seven assignable digital inputs.

The alarm protection features on the relay include IRIG-B failure, service (self-test failure), analog inputs 1 to 4. generator running hours, demand (current MW, Mvar, MVA), VT fuse failure, trip counter, thermal overload, open RTD, short/low RTD, RTD (stator, bearing, ambient, other), low forward power, reverse power, reactive power (kvar), neutral Undervoltage (3rd harmonic), neutral overvoltage (fundamental), over frequency, under frequency, volts per hertz, overvoltage, Undervoltage, ground directional, ground overcurrent, negative sequence, overload, and 7 assignable digital inputs (general input and tachometer).

Frequently Asked Questions about 489-P1-LO-A20

What does the LO stand for in the part number 489-P1-LO_A20 GE Multilin 489 Generator Management Relay?

The LO stands for low control power in the part number 489-P1-LO-A20 for the GE Multilin generator management relay. The low control power for the GE Multilin generator management relay consists of 20 to 60 V DC; 20 to 48 V AC at 48 to 62 Hz.

How many output relays for the 489-P1-LO-A20 GE Multilin Generator Management Relay?

The GE Multilin 489-P1-LO-A20 has six Form-C output relays, five are always non-failsafe and the sixth Service relay always failsafe. The 6th Service relay, as the failsafe relay, will be energized as normal, it will also de-energize when ready to operate.

How many voltage transformer inputs does a 489-P1-LO-A20 have and how many are for neutal voltage?

The GE Multilin Generator Management Relay 489-P1-LO-A20 has four voltage transformer inputs. Three of the four voltage transformer inputs are for generator terminal voltage and one is for neutral voltage.

Are there any internal ground connections on the CT inputs on the 489-P1-LO-A20?

The 489-P1-LO-A20  does not have any internal ground connections on the CT inputs. If the unit is withdrawn, the automatic mechanisms short eash phase CT circuit.

489-P1-LO-A20 Technical Specifications

Product drawing