Stucke Elektronik SYMAP®BC protection device
SYMAP® BC (Bus-tie Control) is a specialized digital protection and control device from Stucke Elektronik,
specifically designed for Bus-tie Breakers (the breakers that connect different sections of a busbar).
In complex power systems, especially those with redundant architectures, the BC model ensures that power is distributed safely and reliably across multiple segments.
1. Product Description
SYMAP® BC serves as the intelligent controller for bus-couplers and bus-sectionalisers. Its primary job is to manage the “link” between two independent power buses.
It prevents out-of-phase paralleling by using integrated synchronization logic and protects the busbar from faults by utilizing high-speed directional or non-directional protection.
In a “split-bus” configuration (common in DP2/DP3 ships), the SYMAP® BC is the critical component that decides when it is safe to join two live power systems and when they must be isolated to prevent a total blackout.
2. Technical Parameter Table
| Category | Specification |
| Power Supply | 24V DC (Standard) or 110V/230V AC/DC (Optional) |
| Voltage Inputs | Dual 3-phase inputs (Busbar A and Busbar B for synchronization) |
| Current Inputs | 3-phase current monitoring for directional/non-directional protection |
| Synchronization | Built-in Auto-Synchronizer (check-sync) for phase, voltage, and frequency |
| Protection Functions | Overcurrent (50/51), Directional Overcurrent (67), Under/Over Voltage (27/59), Under/Over Frequency (81) |
| Logic Control | Customizable PLC for complex interlocking (e.g., prevent closing if G1 is on Bus A) |
| Communication | Modbus RTU/TCP, Profibus DP, CANopen, IEC 61850 |
| Sampling Rate | High-speed processing (< 40ms trip time) |
| Event Storage | 5,000 events + Disturbance recording for fault analysis |
3. Related Models
The BC series is adapted based on the complexity of the switchboard:
SYMAP® BC-Standard: Basic bus-tie control with synchronization and overcurrent protection.
SYMAP® BC-Dir: Enhanced version with Directional Overcurrent Protection, vital for identifying which side of the bus-tie has the fault.
SYMAP® BC-Compact: A space-saving version for smaller industrial switchgear.
SYMAP® BC-HV: Designed for medium and high-voltage busbar systems.
SYMAP® BC
4. Application Cases
Marine Power Systems (DP-Ships): In Dynamically Positioned vessels, the BC manages the connection between engine rooms to ensure redundant power supply while preventing fault propagation.
Data Centers: Controlling the coupling between different UPS-backed bus segments to maintain “Tier 4” availability.
Hospitals: Managing the transition between utility power and emergency generator busbars.
Industrial Microgrids: Integrating renewable energy busbars with the main factory distribution bus.
5. Product Advantages and Features
Integrated Synchronizer: Eliminates the need for a separate external “Check-Sync” relay, reducing wiring and panel space.
Fault Isolation (Selectivity): Advanced directional logic ensures that the bus-tie only opens when necessary, keeping the healthy part of the grid alive.
Interlocking Logic: Built-in “Boolean” logic prevents dangerous operations, such as paralleling two unsynchronized sources or closing onto a dead-short.
Dual Bus Monitoring: Unlike standard relays, the BC is designed to “look” at both sides of the breaker simultaneously.
High Reliability: Uses the signature Stucke 3-CPU hardware architecture, ensuring that the protection logic remains functional even if the display or communication fails.
6. Other Models in the Same Series
Stucke Elektronik offers a unified ecosystem for the entire power plant:
SYMAP® G / ECG: Generator Protection and Engine Control.
SYMAP® F: Feeder Protection for outgoing lines.
SYMAP® T: Transformer Protection.
SYMAP® M / Y: Motor and Pump protection.
SYMAP® LD: Line Differential protection for cable links.