ABB REL561 | 1MRK002496-AC | Troubleshooting & Technical Support | Expert Assistance

Description

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3. Key Technical Specifications

4. Product Introduction

The ABB REL561 (Ordering Code: 1MRK002496-AC) is a comprehensive digital line differential protection terminal designed for the protection of high-voltage transmission lines. As part of ABB’s legacy protection portfolio (predating the Relion® 615/670 series), the REL561 has been a trusted solution in utility substations worldwide for decades, known for its reliable differential protection algorithms and robust construction.The specific ordering code 1MRK002496-AC denotes a particular hardware configuration, including specific voltage ranges, communication interface options, and firmware capabilities tailored for regional grid requirements.Key Features:

• Phase-Separated Current Differential: Evaluates both magnitude and phase angle for each phase independently, providing superior fault detection sensitivity.
• CT Saturation Detection: Built-in stability enhancement through CT saturation detection, preventing false trips during external faults with CT saturation.
• Communication Channel Delay Compensation: Continuously compensates for transmission delays in digital communication channels, ensuring accurate differential current comparison.
• Trip Signal via Communication Channel: Integrated tripping capability through the digital communication link for pilot protection schemes.
• Charging Current Compensation: Compensates for line charging current in long transmission lines, improving differential protection accuracy.
• Distance Protection Backup: Includes 3-zone distance protection with independent settings for each zone, providing backup protection if differential communication fails.
• Master/Master Design: Supports multi-drop connections for multiplexed communication networks.

Additional Protection Functions:

• Phase Overcurrent
• Residual Current (Earth Fault)
• Voltage Protection Functions
• Power Swing Blocking
• Weak Infeed Logic
• Current Reversal Logic

Although superseded by the REL670/RED670 (Relion 670 series) which offers IEC 61850 native support and advanced cybersecurity, the REL561 remains critical in many existing substations. We supply genuine New Surplus units that are unused and factory-sealed, ideal for spare parts or like-for-like replacements.

5. Troubleshooting Quick Reference

Closing Suggestion: For the REL561, accurate channel delay compensation and CT matching between line terminals are critical for differential protection. If experiencing differential maloperation:

1. Verify the CT ratios entered in both end relays match the field instrument transformers.
2. Check the communication channel delay settings.
3. Review the bias characteristic settings for differential protection.
4. Contact support with a screenshot of the measured differential and restraint currents during a test.

6. Frequently Asked Questions (FAQ)

Q1: What does the ordering code “1MRK002496-AC” specifically indicate?A: ABB ordering codes are highly specific.

• 1MRK: Indicates the product family (Protection/Control).
• 002496: The base model identifier for this specific REL561 configuration.
• -AC: The revision or suffix indicating specific options, such as:
  • Auxiliary voltage range (e.g., 110V DC vs 220V DC).
  • Communication port type (e.g., RS485 vs LONWORKS vs Fiber).
  • Firmware version pre-loaded.
  • Regional customization (e.g., specific language or standard compliance).
    Recommendation: When replacing, try to match the full ordering code exactly. If substituting with a different suffix (e.g., -AD), verify the auxiliary voltage, communication pinout, and firmware compatibility first.

Q2: Is the REL561 still supported by ABB? Can I get firmware updates?A: The REL561 is a legacy product.

• Support: ABB provides limited “sustainment” support for installed bases, but active development has ceased.
• Firmware: New firmware releases are rare. Updates are typically only for critical security patches or major bug fixes found in the field.
• Replacement Strategy: For new projects or major upgrades, ABB recommends migrating to the REL670/RED670 (Relion 670 series). However, for maintenance of existing sites, the REL561 is still widely used and supported via the global surplus market and specialized service partners.
• Service Life: ABB typically supports legacy products for 10+ years after discontinuation, but spare parts availability may become limited.

Q3: What software is needed to configure the REL561?A: Configuration typically requires legacy ABB tools, which may include:

• CAP501 (Computer Aided Protection): An older Windows-based tool for setting parameters.
• Relay Manager: Specific to the 500-series relays.
• PCM600: Newer versions of PCM600 may support older relays via specific device descriptions, but often legacy tools are more reliable for the REL561.
  Note: Running these tools often requires older Windows environments (Windows XP/7) or Virtual Machines, as driver compatibility with Windows 10/11 can be challenging for old serial converters.

Q4: What communication channels does the REL561 support for differential protection?A: The REL561 supports various communication channels for line differential protection:

• Pilot Wire: Traditional copper pilot wire connections.
• Fiber Optic: Direct fiber or via multiplexer.
• Microwave/Radio: Via interface converters.
• Multiplexed Channels: Via PCM/SDH equipment with appropriate interfaces.
  The specific channel type depends on the communication module installed in the relay (defined by the ordering code). The -AC suffix may indicate a specific communication interface configuration.

Q5: How does the REL561 compare to the REL551?A: Both are legacy line protection relays from the same era:表格

If your protection scheme relies on pilot differential protection, the REL561 is the typical choice. For step-distance schemes without communication-based differential, the REL551 is standard.Q6: How do I verify if a used/surplus REL561 is functional?A: Since this is a legacy unit, verification is key:

1. Visual Inspection: Check for burnt components, swollen capacitors, or corroded terminals.
2. Power-Up Test: Apply rated auxiliary voltage; ensure “Healthy”/”Run” LED illuminates and no “Hardware Fault” appears.
3. Self-Test: Run the internal self-test routine via the front panel or software.
4. Communication Test: Verify communication channel establishment with the remote terminal.
5. Secondary Injection: If possible, perform a quick injection test to verify differential and distance protection operate correctly.
   We provide a 12-month warranty on our surplus units and perform basic power-up tests before shipping.

Q7: What is the migration path from REL561 to modern relays?A: For sites planning to modernize:

• Direct Replacement: The RED670 (Relion 670 series) is the recommended successor, offering:
  • Native IEC 61850 support (GOOSE/MMS)
  • Enhanced differential algorithms
  • Modern cybersecurity features
  • PCM600 configuration (Windows 10/11 compatible)
• Panel Modifications: Direct retrofit usually requires panel cutout modifications and wiring changes due to different form factors.
• Commissioning: Plan for parallel operation during transition, with careful testing of the new relay before disconnecting the old unit.
• Settings Migration: Protection settings need to be recalculated and verified, as algorithms may differ between legacy and modern relays.

Q8: Do you provide technical assistance for setting calculations?A: Yes. Our team includes engineers experienced with legacy ABB relays. We can assist with:

• Interpreting the Setting Group structure.
• Verifying Differential Bias characteristic settings.
• Calculating Channel Delay Compensation values.
• Troubleshooting Communication mapping issues.
• Coordinating Distance Zone backup settings.
  Please provide your single-line diagram, line parameters, and CT/VT ratios for specific advice.

Contact info

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