中文版
Description
The Generator Management Relay 489-P1-LO-A20 is a model that operates on a low control power at 20 to 60 vDC or 20 to 48 VAC at 48-62 Hz. This model has an analog output of four to twenty milliamperes.
Communication Ports Protocol Modbus® RTU / half duplex, DNP 3.0
Current Rating Fuse 2.5 A
Demand Metering Update Rate 1 Minute
Digital Inputs 9 Opto-Isolated Inputs
Ground Directional Elements Alarm and Trip
Negative Sequence Overcurrent Pickup Level 3 to 100% FLA in steps of 1
Phase Voltage Inputs Burden > 500 KΩ
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.
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).
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