ABB REB615E_H Relion® 615 series protection relay

Here's the technical breakdown for ABB REB615E_H – the high-precision busbar protection relay from ABB's Relion® 615 series:

ABB REB615E_H

High-Impedance Busbar Protection Relay

*(Relion® 615 Series | "H" = High-Precision Hardware)*

1. Core Identity

Application: Busbar differential protection (87B) for substations.

Hardware Platform: REB615E

Suffix "H": High-accuracy analog inputs (HCTs) for secure fault discrimination.

Key Strength: Immune to CT saturation during faults.

2. Protection Functions

Function Description

High-Impedance Diff. Primary 87B protection (stability up to 100 kA asym. fault current)

Check Zone Backup differential scheme for security

Breaker Failure (50BF) Backup tripping for stuck breakers

CT Supervision Real-time monitoring for CT circuit integrity

3. "H" Variant Advantages

High Core CTs (HCTs):

±0.1% measurement accuracy (critical for busbar stability).

64 samples/cycle sampling (detects sub-cycle faults).

Secure CT Saturation Handling:

Advanced algorithms prevent maloperation during CT saturation.

Cyber-Hardened:

IEC 62351-compliant encryption for GOOSE/MMS.

4. Technical Specifications

Parameter Specification

Differential Zones Up to 10 zones (configurable per bus section)

I/O Capacity 32 DI / 24 DO (expandable via modules)

Communication 4× Ethernet ports (IEC 61850 Ed.2 GOOSE/MMS/SV) + IEEE C37.94 fiber teleprotection

Operating Temp -40°C to +85°C

Standards IEC 60255, IEEE C37.90, IEC 61000-4-5 (surge immunity)

Order Code 1MRK 505 337-BEN (verify datasheet)

5. Typical Applications

HV Substations: Primary busbar protection (66–765 kV).

Industrial Plants: Critical process bus protection.

Generator Bus Ducts: Fast fault clearance (<10 ms).

Retrofit Projects: Replacement for legacy REB500/REB103 relays.

6. Differentiation from REC/RET Models

Model Protection Focus REB615E_H Advantage

REC615E_H Feeder protection Busbar topology support

RET615E_H Transformer protection CT saturation immunity

REQ615E_H Transformer diff. only Multi-zone differential logic

Critical Engineering Notes

Stability Requirements:

Requires identical CT ratios across all feeders for reliable operation.

Testing Complexity:

Commissioning demands secondary injection tests with CT simulation.

Configuration Tool:

ABB PCM600 mandatory for zone logic and GOOSE mapping.

Arc Flash Mitigation:

Ultra-high-speed tripping (<5 ms) reduces arc flash energy.