Description
1. Product Description
DEIF RMC-131D/2 is a Differential Current Protection Relay developed by DEIF, a global leader in power management and control systems. Designed for critical generator and grid protection, DEIF RMC-131D/2 provides fast-acting fault detection against short circuits, ground faults, and winding leakage currents. This relay leverages three-phase current differential measurement with RMS and peak detection, achieving response times below 50 ms. Ideal for marine power systems, industrial generators, and renewable energy installations, DEIF RMC-131D/2 complies with DNV-GL, ABS, and IEC 60255 standards, ensuring reliable performance even in high-harmonic environments.
2. Product Parameters
| Parameter Category | Specifications |
|---|---|
| Input Current Range | 0.3–5.0 A AC (40–70 Hz) |
| Differential Threshold | 0.04–0.4 × In (adjustable) |
| Max Continuous Current | 4 In (75 A transient for 10 sec) |
| Output Contacts | 2 × Changeover (250 VAC/24 VDC, 8 A) |
| Response Time | <50 ms (fault detection to action) |
| Power Supply | 57.7–690 VAC or 24–220 VDC |
| Protection Rating | IP40 (housing), IP20 (terminals) |
| Mounting | 35 mm DIN rail or baseplate |
| Operating Temperature | -25°C to +70°C |
| Certifications | DNV-GL, ABS, IEC 60945, UL94 (V1) |
RMC-131D2
3. Advantages and Features
- High-Precision Protection: Detects leakage currents as low as 4% of rated current (In), minimizing false triggers in a 6.6 kV container ship power system.
- Dual Measurement Modes: Combines RMS stability for sinusoidal currents with peak detection for ultrafast fault response.
- Adjustable Settings: Customizable thresholds, time delays (T1), and contact latching for diverse grid configurations.
- Enhanced Reliability:
- 2% hysteresis prevents contact chattering under fluctuating loads.
- 200 ms power supervision circuit avoids false trips during voltage dips.
- Diagnostic LEDs: Dual-color indicators (green = power, yellow/red = faults) simplify troubleshooting.
4. Application Fields and Case Studies
Key Industries:
- Marine: Generator protection in dynamic positioning systems and hybrid vessels.
- Industrial: Preventing transformer overheating in steel mills with harmonic mitigation.
- Renewables: Grid compliance for offshore wind farms paired with DEIF AGC controllers.
Case Study:
An offshore drilling platform deployed DEIF RMC-131D/2 to protect its 4 MW diesel generators:
- Detected an insulation fault, triggering a shutdown and preventing $2M in generator damage.
- Integrated with SCADA via Modbus RTU, reducing maintenance downtime by 40% through remote fault logging.
5. Competitive Comparison
Compared to generic differential relays:
- 2× Higher Contact Rating (8 A vs. typical 5 A resistive load capacity).
- Wider Temperature Range: Operates reliably at -25°C, outperforming competitors limited to 0°C.
- Certification Edge: Full DNV-GL and ABS compliance for marine applications, unlike industry-standard IEC-only models.
RMC-131D2
6. Selection Guidance
- System Compatibility: Verify voltage range (AC 690 V or DC 220 V) and CT ratios.
- Environmental Needs: Opt for IP66 enclosures in humid or offshore environments.
- Expansion: Add DEIF I/O-16 modules for additional sensor inputs in complex setups.
- Budget: Prioritize firmware preloaded with DNV-GL settings to reduce commissioning costs.
7. Important Notes
- Installation:
- Follow NEC/CEC wiring standards (max 4 mm² conductor size).
- Ensure ground resistance <1 Ω to avoid EMI interference.
- Maintenance:
- Annual calibration with DEIF CAL-400 toolkit.
- Inspect contacts every 6 months for oxidation.
- Safety:
- Disconnect auxiliary power and wait 200 ms before servicing.
- Avoid deployment in systems with >5 kHz VFDs without EMI shielding.
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