GE MLJ1005B010H00C

Product Introduction

The MLJ1005B010H00C is a high-precision digital synchronism check relay from GE Multilin, designed to ensure safe and reliable synchronization of AC power systems during generator-to-grid or grid-to-grid interconnections. It accurately monitors voltage magnitude, frequency, phase angle, and frequency slip between two AC systems, initiating a closure signal only when all synchronization parameters fall within predefined thresholds. The relay integrates advanced digital signal processing for real-time measurement and control, with flexible configuration options for under/overvoltage supervision, phase angle matching, and frequency slip limits.
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Description

Technical Specifications

  • Manufacturer: General Electric (GE Multilin)
  • Product Series: GE Multilin MLJ Series
  • Part Number: MLJ1005B010H00C
  • Relay Type: Digital Synchronism Check Relay
  • Operating Frequency: 50 Hz / 60 Hz (selectable)
  • Voltage Input: 100 V AC (phase-phase), 57.7 V AC (phase-neutral)
  • Frequency Measurement Range: 45–65 Hz (50 Hz system), 55–65 Hz (60 Hz system)
  • Frequency Slip Setting Range: 0.00–0.05 Hz (adjustable in 0.01 Hz steps)
  • Phase Angle Setting Range: 0°–360° (adjustable in 1° steps)
  • Voltage Matching Tolerance: ±5% to ±20% of nominal voltage (configurable)
  • Communication Protocols: Modbus RTU, Profibus DP
  • Digital Inputs: 2 programmable digital inputs (24 V DC)
  • Relay Outputs: 2 Form C relay outputs (5 A, 250 V AC)
  • Operating Temperature: -25°C to +70°C (-13°F to +158°F)
  • Storage Temperature: -40°C to +85°C (-40°F to +185°F)
  • Humidity Range: 5%–95% non-condensing
  • Enclosure Rating: IP30 (panel-mounted)
  • Dimensions: 82 mm × 122 mm × 60 mm (3.2 in × 4.8 in × 2.4 in)
  • Weight: 0.6 kg (1.3 lb)
  • Display: LCD with 4-line text and LED status indicators
  • Certifications: IEC 60255, IEEE C37.20.7, ANSI/IEEE C37.90.1

Functional Features

  • Precision Synchronization Monitoring: Real-time measurement of voltage, frequency, phase angle, and frequency slip between two AC systems for safe interconnection.
  • Flexible Parameter Configuration: Adjustable frequency slip (0.00–0.05 Hz), phase angle (0°–360°), and voltage matching tolerance (±5% to ±20%) to meet specific system requirements.
  • Undervoltage/Overvoltage Supervision: Configurable voltage thresholds to prevent synchronization under abnormal voltage conditions.
  • Digital Input/Output Control: 2 programmable digital inputs for external interlocks and 2 Form C relay outputs for synchronization closure and alarm signals.
  • Communication Integration: Modbus RTU and Profibus DP protocols for remote monitoring, control, and data logging via SCADA systems.
  • Local HMI Interface: LCD display with LED indicators for real-time status monitoring, parameter adjustment, and fault diagnostics without additional tools.
  • Manual Synchronization Mode: Adjustable manual mode time (0.1–5 seconds in 0.1-second steps) for operator-initiated synchronization under controlled conditions.
  • Event Recording: Stores up to 500 synchronization events with time stamping (1 ms resolution) for post-event analysis.
  • Self-Diagnostic Functions: Continuous monitoring of internal circuits, inputs, and outputs to detect faults and trigger alarms.
  • IEC/IEEE Compliance: Certified to global standards for reliable performance in power generation and transmission applications.

Application Scenarios

  • Power Generation Plants: Synchronization of gas, steam, and hydro generators to the utility grid during startup and parallel operation.
  • Industrial Cogeneration Facilities: Safe interconnection of on-site generators with the main grid to optimize energy usage and reduce costs.
  • Utility Substations: Grid-to-grid synchronization for tie-line closure in transmission and distribution networks.
  • Renewable Energy Integration: Synchronization of solar and wind farm inverters to the grid for stable power injection.
  • Critical Infrastructure: Hospitals, data centers, and military facilities with backup generators requiring seamless grid synchronization.
  • Microgrid Systems: Synchronization of distributed energy resources (DERs) within microgrids for reliable power distribution.
  • Industrial Automation: Synchronization of on-site power systems with industrial machinery to ensure stable operation during grid fluctuations.

Compatibility

  • Voltage Transformers: 100 V AC (phase-phase), 57.7 V AC (phase-neutral)
  • Communication Systems: Modbus RTU, Profibus DP (SCADA integration)
  • Software: GE EnerVista™ MLJ Setup Software for configuration, monitoring, and diagnostics
  • Power Supplies: 110–250 V DC / 110–230 V AC industrial power systems
  • Mounting: Panel mounting with standard 82 mm × 122 mm cutout

Installation Notes

  1. Mounting: Install in a panel with 82 mm × 122 mm cutout; ensure 50 mm clearance for airflow and wiring.
  2. Power Connection: Connect 110–250 V DC or 110–230 V AC power supply; verify voltage compatibility before energization.
  3. Voltage Input Wiring: Connect voltage transformers (100 V / 57.7 V) with shielded cables to minimize noise interference.
  4. Communication Setup: Configure Modbus RTU or Profibus DP parameters via EnerVista™ MLJ Setup Software.
  5. Parameter Configuration: Set frequency slip, phase angle, voltage matching, and manual mode time using the local HMI or software.
  6. Digital I/O Assignment: Assign digital inputs for interlocks and relay outputs for synchronization closure/alarm signals.
  7. Event Recording Setup: Enable event recording (500 events max) and set time synchronization via SNTP server.
  8. Post-Installation Testing: Validate synchronization logic, voltage/frequency monitoring, and communication links before system commissioning.

Key Advantages

  • Precision Synchronization: Accurate measurement of voltage, frequency, phase angle, and frequency slip for safe system interconnection.
  • Flexible Configuration: Adjustable parameters to meet diverse system requirements and operating conditions.
  • Seamless Communication: Modbus RTU and Profibus DP integration for remote monitoring and control.
  • Local HMI Interface: LCD display and LEDs enable on-site operation without additional tools.
  • Manual Synchronization Mode: Operator-initiated synchronization with adjustable time settings for controlled operation.
  • Event Recording: 500-event storage with 1 ms time stamping for detailed post-event analysis.
  • Self-Diagnostic Functions: Continuous fault detection to ensure reliable relay operation.
  • Global Certifications: IEC and IEEE compliance for worldwide installation in power systems.
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