ABB REF615E_L Relion® 615 Series Feeder Protection Relay

Here's the technical specification for ABB REF615E_L – a specialized feeder protection relay optimized for directional ground fault protection in compensated/resonant-earthed networks:

ABB REF615E_L

Feeder Protection Relay with Sensitive Directional Earth Fault

*(Relion® 615 Series | "L" = Earth Fault Focus)*

Order Code: 1MRK 002 231-BEN

1. Core Identity

Hardware Platform: REF615E

Suffix "L": Enhanced for low-current/resistive ground fault detection (67N) in impedance-earthed systems.

Key Innovation: Adaptive polarization for Petersen coil (arc suppression coil) networks.

2. Key Protection Functions

Function Technical Scope

Directional Earth Fault Sensitive 67N (0.5–300 A) with dual polarization (V₀ + I₀ cross-polarization)

Adaptive Logic Auto-detection of resonant/compliance earthed vs. solidly grounded systems

Feeder Prot. Non-directional OC (50/51), undervoltage (27), auto-reclose (79)

Insulation Monitoring Residual voltage (59N) & current (64R) supervision

3. "L" Variant Hardware Distinction

Enhanced V₀ Measurement:

Dedicated residual voltage input (accuracy ±0.2%) for polarization.

High-Resolution I₀ Sensing:

1 mA resolution for core-balanced CTs (e.g., 50/1A, 100/1A).

Harmonic Analysis:

5th/7th harmonic blocking for arc suppression coil tuning.

4. Technical Specifications

Parameter Specification

Ground Fault Range 0.5–300 A (I₀) / 0.1–150 V (V₀)

Polarization V₀ (zero-seq voltage) + cross-I₀ (transient-based)

I/O Configuration 16 DI / 10 DO + 1 dedicated V₀ input

Communication 2× Ethernet (IEC 61850 GOOSE/MMS) + RS485 (Modbus)

Selectivity ≤30 ms operating time for forward faults

5. Typical Applications

Compensated Networks:

Petersen coil-earthed distribution systems (6–36 kV).

Industrial Plants:

Cable-rich networks with high capacitive ground currents.

Renewable Integration:

Ground fault protection in wind/solar collector feeders.

Mining Operations:

Safety-critical IT/unearthed systems (with 64R function).

**6. Differentiation from Standard Models

Model REF615E_L REF615E_G

Key Focus Directional earth fault (67N) General feeder protection

I₀ Sensitivity 0.5 A (adjustable) 2% of CT rating (typically 2–5 A)

V₀ Input Dedicated channel Shared with phase VTs

Compliance Logic Auto-adaptive Manual configuration only