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Phone：+86 15383419322Description
The ABB SPAD346C3 is a high-imtegrity high-impedance differential protection relay engineered for fast and secure fault clearance in power transformers, generators, motors, and busbars. As part of ABB’s SPACOM protection series, this relay employs voltage-based operating principles to detect internal faults with unmatched stability during external faults or CT saturation. The ABB SPAD346C3 features adjustable operating voltage (20–320 V) and harmonic restraint, ensuring immunity to inrush currents and overexcitation conditions. Its triple-redundant processing architecture executes trip decisions within 10 ms while supporting IEC 61850 Ed.2, Modbus, and DNP3 protocols for seamless grid integration. Designed for critical assets in substations and industrial plants, the relay operates reliably from –40°C to +70°C with 4 kV surge immunity.
ABB SPAD346C3
Technical Specifications
| Parameter | Value |
| Product Model | SPAD346C3 |
| Manufacturer | ABB |
| Product Type | High-Impedance Differential Protection Relay |
| Operating Principle | Voltage-based differential (high-impedance) |
| Operating Voltage | 20–320 V DC (adjustable in 1 V steps) |
| Operating Time | ≤10 ms (internal fault), stable during CT saturation |
| Harmonic Restraint | 2nd/5th harmonic blocking (adjustable 10–30%) |
| CT Supervision | Detects CT circuit failures (open/short) |
| Inputs | 3-phase current (1/5 A), 1x auxiliary voltage |
| Outputs | 6 x programmable relays (5 A @ 250 V AC) |
| Communication | 2x Ethernet (IEC 61850-8-1, Modbus TCP), RS-485 (DNP3) |
| Auxiliary Supply | 48–250 V DC / 110–230 V AC |
| Operating Temperature | –40°C to +70°C |
| Surge Immunity | 4 kV (IEC 61000-4-5) |
| Certifications | IEC 60255, ANSI C37.90, SIL 3 |
| Dimensions | 177 × 204 × 147 mm (H×W×D) |
Main Features and Advantages
Ultra-stable fault discrimination:
Voltage threshold operation remains stable during CT saturation or external faults
Adjustable 2nd/5th harmonic blocking prevents maloperation during transformer energization
Advanced diagnostics:
Continuous CT circuit monitoring with open/short-circuit alarms
Internal fault recorder captures 128 cycles at 4 kHz sampling
Cyber-resilient operation:
Secure boot with IEC 62443-4-1 compliance
Role-based access control for parameter changes
Deployment flexibility:
DIN-rail or panel mounting options
Configurable logic equations for custom protection schemes
Application Field
The ABB SPAD346C3 protects critical power assets:
Substations: Busbar protection in 110–400 kV switchyards
Power Plants: Generator stator differential protection
Steel Mills: Arc furnace transformer protection
Renewables: Step-up transformer protection in wind/solar farms
Industrial Plants: Motor differential protection for critical compressors (>5 MW)
Mining: High-impedance bus zone protection in HV substations
ABB SPAD346C3
Related Products
CTs for high-impedance diff: ABB UCTB series (Un=200–400 V)
SPAJ140C: Backup overcurrent relay
REC670: Busbar protection controller
SMT-10: RTD module for transformer temp monitoring
RER670: Transformer differential relay (low-impedance)
CMC356: Test set for SPAD346C3 validation
PCM600: Protection configuration software
Installation and Maintenance
Pre-installation preparation: Verify CT knee-point voltage ≥2x relay operating voltage. Connect stabilizing resistors in series with relay. Ensure CT circuits are grounded at a single point only. Configure harmonic blocking ratios based on transformer design.
Maintenance recommendations: Test stability during simulated CT saturation annually. Verify operating voltage threshold every 2 years. Monitor CT circuit resistance via relay diagnostics. Update firmware during planned outages.
