The GE Multilin SR489-P5-HI-A20, also cataloged as the SR489-P5-HI-A20 Generator Management Relay, serves as the primary SR489 Generator Management Relay utilized to execute generator protection and monitoring sequences across induction and synchronous generator networks.
Hardware Specifications
Parameter
Specification
Model
SR489-P5-HI-A20
Brand
GE Multilin
Series
489 Generator Management Relays
Origin
Canada
Weight
2.27 kg (5.00 lbs)
Dimensions
Standard 19-inch rack / draw-out chassis footprint
Operating Temp
-20 to 60 deg C
Current Input Configuration
5 A phase CT secondaries (P5 specification)
Power Supply Control Input
90-300 V DC / 70-265 V AC at 48/62 Hz (HI option)
Analog Output Subsystem
Eight 4-20 mA analog outputs (A20 specification)
User Interface Type
Basic display configuration
Power Protection Matrix and Signal Execution
Current Transformer Sensing and Calibration The module incorporates physical phase sensing transformers optimized for 5 A current transformer secondary loops. This P5 hardware tier monitors high-resolution alternate current waveforms from three-phase generation outputs, feeding the internal processing blocks to perform real-time digital calculations for stator thermal protection, phase differentials, and unbalance mitigation.
Universal High-Voltage Power Stage Engineered with the universal HI power supply architecture, the device accepts wide operational inputs spanning 90-300 V DC or 70-265 V AC at line frequencies of 48/62 Hz. The internal circuit topology isolates delicate central processing units from incoming line transients, maintaining system uptime during critical plant grid faults or sudden DC battery bank dropouts.
High-Density Analog Output Mapping The hardware block features eight field-assignable 4-20 mA analog outputs. These channels act as true current sources that scale with monitored internal registers, streaming variables such as real power, reactive power, voltage, and phase current directly to supervisory SCADA frameworks and distributed control system (DCS) nodes.
