GE SR469-P1-HI-A20-E

GE SR469-P1-HI-A20-E

Product Introduction: The GE SR469-P1-HI-A20-E is a Motor Management Relay from the GE Multilin 469 series, designed for the protection and management of medium-voltage motors. It provides integrated motor protection, fault diagnostics, power metering, and communications in a drawout-case format. The ordering code indicates: P1 (1 A phase CT secondary), HI (high control power range 90–300 V DC / 70–265 V AC), A20 (4–20 mA analog output), E (enhanced display with larger LCD).

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Category: SKU: GE SR469-P1-HI-A20-E

Description

GE SR469-P1-HI-A20-E

Technical Specifications:

  • Series: GE Multilin SR469 Motor Management Relay
  • Phase CT Secondary: 1 A (P1)
  • Control Power: HI = 90–300 V DC, 70–265 V AC, 48–62 Hz
  • Analog Output: 4–20 mA (A20)
  • Display: Enhanced (E) with larger 40-character LCD
  • Communication Ports: RS-232 program port (9600 baud, programmable to 19,200), RS-485
  • Ground CT Inputs: Two inputs (one for GE source-ground management, one for ground CT)
  • VT Input: Accommodates delta or wye VT configurations
  • Drawout Construction: Yes, for rapid replacement
  • Conformal Coating: No (standard environment)
  • Front Panel: LCD, numeric keypad, control/programming keys, status LEDs, sealable drawout handle

Functional Features:

  • Comprehensive motor protection: thermal overload, overcurrent, undervoltage, overvoltage, phase imbalance, ground fault, stall, locked rotor
  • Thermal capacity model with unbalance bias (K-factor) for rotor heating effects
  • VT inputs for voltage- and power-based protection elements
  • CT inputs for phase differential protection
  • Event recording and oscillography for fault analysis
  • Powerful simulation feature for testing functionality and response
  • Enhanced front-panel display with 40-character LCD for local diagnostics
  • Sealable drawout handle to prevent unauthorized removal
  • EnerVista software suite integration for HMI/SCADA connectivity

Application Scenarios:

  • Medium and large horsepower motor protection in industrial plants
  • Steel mills, power plants, cement plants, chemical and paper industries
  • CNC machine tool motor protection
  • Pump and fan motor management in water/wastewater facilities
  • Any application requiring integrated motor protection and diagnostics

Performance Parameters:

  • Advanced thermal model with hot/cold curve ratio (typically 16/18 = 0.89)
  • K-factor unbalance bias calculation for rotor heating
  • RTD biasing for stator temperature compensation
  • Fast-acting protection elements for fault clearance
  • Local and remote user capabilities via RS-232 and RS-485

Material and Structural Characteristics:

  • Drawout relay case with matching enclosure (SR construction)
  • Industrial-grade PCB with high-reliability components
  • Front panel with 40-character LCD, status LEDs, numeric keypad, and programming keys
  • RS-232 program port on front panel
  • Sealable drawout handle for security
  • Rear terminal blocks for CT, VT, control power, and I/O wiring

Working Principle: The relay continuously samples phase currents, voltages, and ground fault currents through CT and VT inputs. The on-board processor executes protection algorithms, comparing measured values against configured setpoints. The thermal capacity model integrates stator heating, unbalance bias (K-factor), and RTD temperature feedback to compute thermal capacity usage. When a protection element trips, the relay energizes output contacts to trip the motor breaker. Event records and oscillography waveforms are stored for post-fault analysis. Installation Requirements:

  • Install in a protection relay panel or switchgear using the SR drawout case
  • Connect phase CTs (1 A secondary), VTs (delta or wye), and ground CT per schematics
  • Wire control power (90–300 V DC or 70–265 V AC)
  • Connect RS-232/RS-485 communication to SCADA or HMI
  • Configure setpoints using EnerVista 469 Setup software
  • Verify drawout mechanism engagement and sealing

Usage Notes:

  • Enable thermal capacity usage to include unbalance bias heating effects
  • Configure K-factor based on motor locked-rotor current (K = 230 / (locked rotor current / FLA)²)
  • Set RTD bias maximum at insulation rating or slightly lower
  • Verify hot/cold curve ratio matches motor thermal limit curves
  • Use the sealable drawout handle to prevent unauthorized removal
  • Periodically test protection functions using a relay test set

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