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ODES Power Supply Monitoring Relays in Overseas Projects

  • Writer: TonyZhang
    TonyZhang
  • Oct 8, 2025
  • 2 min read

In modern substations and industrial facilities, auxiliary power quality directly determines the reliability of protection, automation, and communication equipment. A fluctuating DC bus or unstable AC auxiliary supply can trigger false alarms, protection misoperations, or communication failures. For EPC and utility projects abroad, engineers require monitoring relays that combine anti-chatter performance, multi-voltage support, and international certification.

The GRUS-RTU power supply monitoring relay addresses these challenges, offering fast and reliable detection of undervoltage and power-loss conditions for both DC and AC systems, with built-in suppression of transient fluctuations that often occur in long-distance cabinet wiring.

Core Features


  • Anti-chatter design – Operate ≤20 ms, return 200–400 ms; filters transient dips and avoids false alarms.

  • Multi-voltage compatibility – 48 V DC, 110 V DC, 125 V DC, 220 V DC, and 230 V AC versions available.

  • Dual-circuit architecture – Two independent monitoring loops per device; each loop provides 4 × changeover contacts (or 8 × c/o total).

  • Flexible logic – Supports “fault-closed” outputs preferred in many DCS configurations.

  • Clear indication – LED status for each monitored circuit for quick visual diagnosis.

  • Environmental resilience – Designed and tested for IEC 60255 (relay requirements) and IEC 61000 (EMC); CE certified for global project compliance.


Application Example: South America 220 kV Substation

At a mining-region substation, end-of-bus DC voltage drops caused repeated false loss-of-supply alarms. Installing GRUS-RTU-8 with optimized thresholds and return-time delay eliminated nuisance signals, stabilized protection and communication systems, and simplified remote fault reporting.





Engineering Value


  • Operational stability – Filters short DC dips and switching transients that would otherwise create spurious events.

  • Comprehensive coverage – Monitors both control-power and auxiliary AC feeds within a single standardized device.

  • Installation efficiency – Embedded design and standard terminal layout fit existing overseas panel footprints.

  • International acceptance – CE marking and IEC test documentation simplify submittals in EPC and tender processes.




Reliable auxiliary power supervision is fundamental to stable protection and automation systems. The GRUS-RTU relay provides engineers with precise, noise-immune, and standards-compliant power-supply monitoring—proven in substations and industrial installations across multiple continents.


Facing challenges with false alarms or fluctuating DC bus voltage in control panels?


  • Request technical support on threshold calibration and dual-loop wiring.

  • Obtain IEC/CE documentation for project submission.

  • Keep your protection and control systems powered, steady, and compliant from commissioning to operation.


Contact: 📩 tonyzhang@odes.com.cn







 
 
 

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