Stucke Elektronik SYMAP®DC DC protection

SYMAP® DC is a specialized digital protection and control relay from Stucke Elektronik, specifically engineered for Direct Current (DC) power systems.

1 As industries shift toward battery storage, DC microgrids, and electric propulsion, SYMAP® DC provides the critical safety layer needed for non-alternating current environments.

1. Product Description

SYMAP® DC is a microprocessor-based relay designed to monitor, protect, and control DC switchgear and distribution networks.

2 Unlike standard AC relays that rely on zero-crossing points to extinguish arcs, DC systems require different sensing logic. 

The SYMAP® DC is optimized to detect ultra-fast current rises ($frac{di}{dt}$), ground faults in ungrounded DC systems, and reverse currents in battery or fuel cell applications. 

It serves as both a protection device and a control unit for DC high-speed circuit breakers.

2. Technical Parameter Table

3. Related Models

The SYMAP® DC series is categorized by voltage levels and specific source types:

SYMAP® DC-L: Low voltage DC protection (e.g., 24V, 48V, 110V systems).

SYMAP® DC-H: High voltage DC protection for traction or propulsion (up to 1000V/1500V DC).

SYMAP® DC-BAT: Optimized specifically for Battery Energy Storage Systems (BESS), including State of Charge (SoC) monitoring integration.

SYMAP® DC-Solar: Tailored for large-scale photovoltaic (PV) string and combiner box monitoring.

4. Application Cases

Electric & Hybrid Ships: Protecting the DC Bus in diesel-electric or battery-powered vessels.

Battery Storage (BESS): Monitoring and protecting large lithium-ion battery banks and their connection to inverters.3

DC Microgrids: Providing selective protection for industrial facilities operating on DC power to reduce conversion losses.

Data Centers: Protecting 380V DC distribution architectures used in modern high-efficiency server farms.

Rail & Traction: Secondary protection and monitoring for DC railway substations.

5. Product Advantages and Features

$frac{di}{dt}$ Protection: Capable of detecting the "Rate of Rise" of a fault current, allowing the relay to trip before the current reaches its peak, which is vital in DC systems with low impedance.

Pre-charge Management: Built-in logic to manage the pre-charging of DC bus capacitors, preventing massive inrush currents that could damage components.

Bidirectional Monitoring: Effectively manages systems where power flows in both directions (e.g., charging and discharging a battery).

High EMC Shielding: Encased in a rugged metal housing to withstand the electromagnetic interference typical of high-power DC/AC inverters.

3-CPU Safety Architecture: Maintains the Stucke Elektronik standard of hardware redundancy, ensuring the "Watchdog" always monitors the primary protection processor.

6. Other Models in the Same Series

SYMAP® is a comprehensive platform for total system integration:4

SYMAP® BC: Bus-tie Control (for AC or DC segments).

SYMAP® G / ECG: Generator and Engine management for the AC side.

SYMAP® LD: Line Differential protection for interconnecting cables.5

SYMAP® T: Transformer protection.

SYMAP® M / Y: Motor and Pump protection.6