Technical Parameters of General Electric (GE) 369-LO-R-0-0-0-0 Protection Relay

The GE 369-LO-R-0-0-0-0 is a sophisticated motor protection relay designed for comprehensive safeguarding of three-phase induction motors in industrial applications. Below are its key technical specifications and features:

General Specifications

• Model: 369-LO-R-0-0-0-0
• Manufacturer: General Electric (GE) Multilin
• Type: Digital Motor Protection Relay
• Application: Protection, monitoring, and control of three-phase induction motors
• Mounting: DIN rail or panel-mounted
• Enclosure Rating: NEMA 1/IP20 (indoor use, dust-protected)

Electrical Ratings

• Voltage Input:
  • Nominal Operating Voltage: 24–600 VAC (phase-to-phase)
  • Frequency: 50/60 Hz
• Current Input:
  • CT Primary Current: 0.5–6,000 A (via current transformers)
  • Secondary Current: 1 A or 5 A (standard CT outputs)
• Power Supply:
  • Voltage Range: 24–240 VDC/VAC (selectable)
  • Power Consumption: ≤10 VA (typical)

Protection Functions

The relay provides the following protection features:

• Overload Protection (Thermal Modeling):
  • I²t (thermal) protection with adjustable time-current curves.
  • Adaptive motor thermal modeling for varying load conditions.
• Phase Unbalance/Loss:
  • Detection of phase unbalance, phase loss, and reverse rotation.
• Stall Protection:
  • Detection of motor stall conditions (locked rotor).
• Overcurrent/Short Circuit:
  • Instantaneous and time-delayed overcurrent protection.
• Undercurrent/Underload:
  • Detection of undercurrent (e.g., belt breakage, pump cavitation).
• Negative Sequence Current:
  • Protection against unbalanced loads and phase reversal.
• Ground Fault Protection:
  • Sensitive ground fault detection (adjustable pickup and time delay).
• Voltage Protection:
  • Overvoltage, undervoltage, and voltage unbalance protection.
• Start/Run Time Supervision:
  • Adjustable start and run time limits to detect abnormal motor behavior.

Monitoring & Diagnostics

• Real-Time Measurements:
  • Current (RMS), voltage (RMS), frequency, power factor, kW, kVAR, kVA.
  • Negative sequence current, ground fault current, and thermal capacity.
• Event Logging:
  • Stores up to 100 fault events with timestamps and waveforms.
• Oscillography:
  • Captures pre- and post-fault waveforms for detailed analysis.
• Thermal Monitoring:
  • Displays real-time motor thermal status (percentage of capacity used).

Communication & I/O

• Communication Protocols:
  • Modbus RTU/TCP (standard)
  • DNP3 (optional)
  • IEC 61850 (optional)
• Serial Ports:
  • 1 × RS-485 (Modbus RTU)
  • 1 × RS-232 (for local configuration)
• Digital Inputs/Outputs (DI/DO):
  • DI: 4 configurable inputs (24 VDC, 10–30 VDC)
  • DO: 4 relay outputs (5 A @ 250 VAC/30 VDC, Form C contacts)
• Analog Outputs (Optional):
  • 2 × 4–20 mA outputs (programmable for current, voltage, power, etc.)

Environmental & Mechanical Specifications

• Operating Temperature: -20°C to +60°C (-4°F to +140°F)
• Storage Temperature: -40°C to +85°C (-40°F to +185°F)
• Humidity: 5% to 95% non-condensing
• Altitude: Up to 3,000 m (10,000 ft) without derating
• Vibration Resistance: Conforms to IEC 60068-2-6
• Shock Resistance: Conforms to IEC 60068-2-27

Approvals & Standards

• UL Listed (UL 508)
• cUL Listed (CSA C22.2 No. 14)
• CE Marking (compliance with LV Directive, EMC Directive)
• IEC 60255-1, IEC 61010-1
• RoHS Compliant

Key Features

• Flexible Configuration:
  • User-programmable settings via front-panel keypad or software (EnerVista™ 369 Setup Software).
• Advanced Diagnostics:
  • Phasor diagrams, sequence components, and harmonic analysis.
• Security:
  • Multi-level password protection for configuration changes.
• Self-Supervision:
  • Continuous monitoring of relay health (CT supervision, power supply status).

Applications

• Industrial Motors: Pumps, fans, compressors, conveyors.
• Critical Infrastructure: Water/wastewater treatment, oil & gas, mining.
• Power Generation: Auxiliary motors in power plants.

Conclusion

The GE 369-LO-R-0-0-0-0 is a highly configurable and reliable motor protection relay suitable for demanding industrial environments. Its advanced protection, monitoring, and communication capabilities make it ideal for ensuring motor longevity and minimizing downtime.

For detailed setup and programming, refer to the GE EnerVista™ 369 Software and the 369 Motor Management Relay Instruction Manual.