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.、

SYMAP® BC

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.

SYMAP® BAT is a cutting-edge digital controller from Stucke Elektronik, specifically engineered for the management of Battery Energy Storage Systems (BESS) and their integration into hybrid power networks.

1 As global industries move toward decarbonization, this device serves as the critical “brain” for battery-based power sources.

1. Product Description

SYMAP® BAT is a multifunctional control and protection relay designed for modern hybrid energy systems.

2 It manages the interface between the battery (via power converters/inverters) and the main power grid or shipboard busbar.

Its primary role is to ensure the safe charging and discharging of batteries, maintain the “State of Charge” (SoC), and coordinate with other energy sources (like diesel generators or fuel cells) to optimize fuel efficiency and power stability.

It bridges the gap between the Battery Management System (BMS) and the overall Power Management System (PMS).

2. Technical Parameter Table

Category	Specification
Power Supply	24V DC (Wide range 18V – 36V)
DC Monitoring	Voltage (up to 1500V DC via transducers), Charging/Discharging Current
AC Monitoring	3-phase Voltage, Current, Frequency, and Power at the Inverter output
Energy Management	SoC (State of Charge) & SoH (State of Health) monitoring via BMS interface
Protection (DC Side)	Overcurrent, Short Circuit, Reverse Current, Ground Fault (IT-systems)
Protection (AC Side)	Under/Over Voltage, Under/Over Frequency, ROCOF (Rate of Change of Frequency)
Communication	Dual Ethernet (IEC 61850), Modbus TCP/RTU, CANopen (for BMS communication)
Operational Logic	Built-in PLC for Black-start, Peak Shaving, and Load Sharing logic

logic

3. Related Models

The BAT series is part of the “Hybrid” portfolio of SYMAP®:

SYMAP® BAT-Standard: General battery management for backup UPS systems.

SYMAP® BAT-Marine: Type-approved for hybrid vessels, including specific “Spinning Reserve” logic.

SYMAP® BAT-Compact: A space-saving version for containerized BESS solutions.

SYMAP® DC: Often used in conjunction with BAT for dedicated DC-bus protection.

4. Application Cases

Hybrid Marine Vessels: Managing batteries to allow diesel engines to run at optimal loads, or enabling “Zero Emission” mode in ports.

Peak Shaving in Industry: Discharging batteries during periods of high demand to reduce electricity costs and grid strain.3

Black-Start Capability: Using stored battery energy to restart a dead power plant or shipboard grid without external power.

Offshore Platforms: Providing high-speed “Spinning Reserve” to replace a failing generator instantly, preventing a total blackout.

5. Product Advantages and Features

Seamless Hybrid Integration: Automatically balances the load between traditional generators and batteries to maximize fuel savings.

Advanced Safety: Monitors the DC link and AC output simultaneously, providing a “dual-layer” protection zone.

BMS Gateway: Acts as a robust interface between various battery manufacturer protocols (BMS) and the high-level ship/factory automation.

Dynamic Response: Capable of ultra-fast load intake (milliseconds), which is essential for stabilizing grids with high renewable penetration.

Fail-Safe Reliability: Features the Stucke 3-CPU architecture, ensuring that protection logic is never interrupted by communication or display tasks.

6. Other Models in the Same Series

The SYMAP® ecosystem provides a total solution for hybrid switchboards:

SYMAP® ECG: For the diesel or gas engines in the hybrid mix.

SYMAP® BC: Bus-tie Control to manage the connection between battery segments and the main bus.

SYMAP® LD: Line Differential protection for the cables connecting battery containers to the switchroom.4

SYMAP® G: Specialized protection for the main alternators.

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

Category	Specification
Power Supply	24V DC (Standard range 18V – 36V)
DC Voltage Input	Up to 1500V DC (via specialized transducers/voltage dividers)
DC Current Input	Via Shunts (e.g., 60mV/150mV) or Hall Effect sensors
Protection Functions	DC Overcurrent (76), Rate of Rise ($\frac{di}{dt}$), Reverse Current (32), Under/Over Voltage (27/59)
Insulation Monitoring	Integrated ground fault detection for IT (ungrounded) DC systems
Logic Control	Built-in PLC for DC breaker management and pre-charging logic
Communication	Modbus TCP/RTU, CANopen, Profibus, or IEC 61850
Sampling Rate	High-speed sampling optimized for DC fault transients
HMI	Graphic LCD showing DC bus voltage, load current, and power

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.

SYMAP®DC

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.

SYMAP®DC

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

SYMAP® LD (Line Differential Protection) is a high-precision digital protection relay from Stucke Elektronik, specifically designed to protect power cables and overhead lines in complex power grids.

1 It is the primary choice for ensuring the selective and high-speed clearing of faults on critical interconnecting lines.

1. Product Description

SYMAP® LD utilizes the Current Differential principle (ANSI 87L) as its primary protection method.

By comparing the current entering one end of a line with the current leaving the other end, it can detect internal faults with extreme sensitivity while remaining completely stable during external faults (through-faults).

Because it monitors both ends of the protected zone, it requires a dedicated communication link (pilot wire or fiber optic) between the two SYMAP® units at each end of the line.

2. Technical Parameter Table

Category	Specification
Power Supply	24V DC (Standard) or 110V/230V AC/DC (Optional)
Primary Protection	Line Differential Protection (87L)
Backup Protection	Directional Overcurrent (67), Distance (optional), Earth Fault (51N)
Communication Link	Fiber optic (via converter), Pilot wire, or RS485 dedicated link
Synchronization	GPS or communication-based time synchronization for phase comparison
Tripping Time	Instantaneous (< 30ms for internal faults)
Analog Inputs	3-phase current + 1 neutral current; 3-phase voltage
Monitoring	CT supervision, communication channel monitoring
Interface	Graphic LCD with localized menus and status LEDs
Operating Temp	-20°C to +70°C

3. Related Models

The SYMAP® LD is often used in pair with other units or specific communication modules:

SYMAP® LD-Standard: For standard cable protection in industrial loops.

SYMAP® LD-FO: Equipped with integrated fiber optic interfaces for long-distance line protection.

SYMAP® LD-G: A hybrid version that combines line differential with generator or feeder backup functions for specific shipboard topologies.

4. Application Cases

Marine Ring Main Systems: Protecting the vital cable links between the fore and aft switchboards on large vessels or cruise ships.

Offshore Power Links: Protecting the subsea cables connecting offshore platforms or wind turbines to a central hub.

Industrial Microgrids: Ensuring selective protection in closed-loop or “mesh” networks where standard overcurrent relays cannot achieve proper coordination.

Data Centers: Protecting the high-reliability feeders between different power modules to ensure zero-downtime fault isolation.

5. Product Advantages and Features

Absolute Selectivity: Only trips if the fault is located within the protected cable segment, preventing unnecessary blackouts in other parts of the system.

High-Speed Fault Clearing: Since it does not rely on time-grading (waiting for downstream relays), it clears faults much faster than standard overcurrent relays.

Bi-directional Protection: Ideal for networks with multiple power sources where fault current can flow in either direction.

Channel Supervision: Constantly monitors the communication link between the two relay ends; if the link fails, it automatically switches to a backup “Directional Overcurrent” mode.

3-CPU Security: Built on Stucke’s fail-safe hardware platform, ensuring that a single component failure does not disable the protection logic.

6. Other Models in the Same Series

The SYMAP® platform provides a unified HMI and software environment for the entire plant:

SYMAP® G / ECG: Generator and Engine management.

SYMAP® F: Feeder protection (time-graded).

SYMAP® T: Transformer protection (Differential 87T).

SYMAP® BC: Bus-tie Control for managing busbar couplers.

SYMAP® Y / M: Motor and Pump protection.2

SYMAP® T (Transformer Protection) is a specialized digital protection relay from Stucke Elektronik, engineered to safeguard power transformers in marine, offshore, and industrial power systems.

It focuses on detecting internal faults, such as insulation failure, as well as external system disturbances.

1. Product Description

SYMAP® T is a high-performance, microprocessor-based protection device that provides a comprehensive safety net for distribution and power transformers.

Its primary objective is to minimize damage during a fault (such as a short circuit or insulation breakdown) by isolating the transformer within milliseconds.

It integrates sophisticated algorithms like Current Differential Protection and Inrush Restraint, ensuring that the relay can distinguish between a dangerous fault and the normal surge of current that occurs when a transformer is first energized.

2. Technical Parameter Table

Category	Specification
Power Supply	24V DC (Standard) or 110V/230V AC (Optional)
Current Inputs	2 sets of 3-phase CT inputs (High side & Low side) for Differential Protection
Voltage Inputs	3-phase ($U_1, U_2, U_3$) for voltage monitoring and over-fluxing protection
Frequency Range	40 Hz – 70 Hz
Main Protection (ANSI)	Differential (87T), Restricted Earth Fault (64REF), Overcurrent (50/51), Over-excitation (24)
Binary I/O	Up to 18 Digital Inputs / 15 Relay Outputs (Customizable)
Analog Inputs	PT100/RTD inputs for oil and winding temperature monitoring
Communication	Modbus RTU/TCP, Profibus DP, IEC 61850 (Digital Substation ready)
Event Logging	Stores up to 5,000 events and high-resolution fault waveforms

3. Related Models

The SYMAP® T series is scaled based on the size and importance of the transformer:

SYMAP® T (Standard): Focused on overcurrent, earth fault, and thermal monitoring for smaller distribution transformers.

SYMAP® T-Diff: The premium version featuring Transformer Differential Protection (87T), essential for large power transformers to detect internal phase-to-phase and winding faults.

SYMAP® T-HV: Designed for High-Voltage applications, interfacing with specialized instrument transformers.

SYMAP®T

4. Application Cases

Marine Power Distribution: Protecting the step-down transformers that convert high-voltage propulsion power to low-voltage shipboard power.

Offshore Wind Farms: Safeguarding the transformers located within turbines or offshore substations.

Industrial Plants: Used in steel mills, refineries, and mines to protect the main service transformers feeding the facility.

Shore-to-Ship Power: Protecting the transformers in “Cold Ironing” systems where ships connect to the local land grid.

SYMAP®T

5. Product Advantages and Features

Inrush Current Detection: Advanced harmonic filtering (2nd harmonic restraint) prevents nuisance tripping when the transformer is switched on.

Vector Group Compensation: Software-based adjustment for different transformer connection types (e.g., Dyn11. Yd1), eliminating the need for complex interposing CTs.

Integrated Control Logic: Includes a “Boolean” logic editor to manage transformer cooling fans, tap-changer interlocks, and Buchholz relay signals.

Comprehensive Monitoring: Combines electrical protection with mechanical monitoring (temperature, pressure, and gas) into a single HMI.

3-CPU Redundancy: Uses Stucke’s signature hardware architecture to ensure protection remains active even during a processor or display failure.

6. Other Models in the Same Series

Stucke Elektronik’s SYMAP® platform offers a unified solution for the entire switchboard:

SYMAP® G: Generator Protection.

SYMAP® M: Motor Protection.

SYMAP® F: Feeder Protection.

SYMAP® BC: Bus-tie Control.

SYMAP® ECG: Integrated Engine Control and Generator Protection.

SYMAP® M (Motor Protection) is a dedicated digital protection relay from Stucke Elektronik designed specifically for the protection, control, and monitoring of high-stakes electric motors.

1 It is widely used for large asynchronous (induction) and synchronous motors in industrial and marine environments.

1. Product Description

SYMAP® M is a multifunctional, microprocessor-based relay that provides comprehensive protection against mechanical and electrical stress.

2 Unlike standard motor starters, SYMAP® M monitors complex thermal images of the motor, protects against stalled rotors, and manages frequent starting cycles.

It integrates protection, measurement, and control (including star-delta or autotransformer starting logic) into a single, rugged unit.3

2. Technical Parameter Table

Category	Specification
Power Supply	24V DC (Standard range 18V – 36V)
Current Inputs	3-phase ($I_1, I_2, I_3$) + 1 Ground ($I_o$) / 1A or 5A rated
Voltage Inputs	3-phase ($U_1, U_2, U_3$) for power and phase monitoring
Motor Specific Protection	Thermal Overload (49), Stalled Rotor (50S), Start Intensity Monitoring, Phase Reversal (46)
Analog Inputs	RTD/PT100 inputs for bearing and winding temperature monitoring
Control Logic	Built-in PLC for motor start/stop sequences and interlocks
Communication	Modbus RTU, Profibus DP, CANbus, or IEC 61850
Protection Speed	Processing cycle < 20ms
Enclosure	IP54 front panel protection; Metal housing for EMC shielding

3. Related Models

The SYMAP® M series includes variants based on motor size and voltage:

SYMAP® M (Standard): Focused on current-based protection for LV/MV motors.

SYMAP® M-V: Adds voltage and frequency monitoring for sensitive motor applications.

SYMAP® M-Diff: Includes Motor Differential Protection (87M) for high-voltage motors to detect internal phase-to-phase faults.

SYMAP® M-Compact: A space-saving version for integration into smaller Motor Control Centers (MCC).

SYMAP®M

4. Application Cases

Marine Propulsion & Thrusters: Protecting the massive electric motors used for ship maneuvering and main propulsion.

Heavy Industry Pumps & Fans: Used in water treatment plants, cooling towers, and mine ventilation systems.

Compressors: Protection for large-scale industrial air or gas compressors in the Oil & Gas sector.

Conveyor Systems: Managing the high-torque start-up phase and overload protection for mining conveyors.

SYMAP®M

5. Product Advantages and Features

Advanced Thermal Modeling: Calculates the motor’s “Thermal Image” in real-time to prevent overheating while allowing maximum operational flexibility.

Comprehensive Start-up Monitoring: Specifically monitors the number of starts and the time between starts to prevent insulation degradation.

Integrated Control: Can replace external timing relays and small PLCs by managing the entire starting sequence (e.g., controlling the main, star, and delta contactors).

Fault Diagnostics: Records the “Trip Profile,” allowing technicians to see exactly what the current and voltage were at the millisecond of the fault.

Safety & Redundancy: Built with the Stucke 3-CPU architecture for fail-safe operation in critical environments.4

6. Other Models in the Same Series

SYMAP® is a modular platform covering the entire power distribution board:5

SYMAP® G: Generator Protection.

SYMAP® EC / ECG: Engine Control and integrated Generator Protection.

SYMAP® F: Feeder Protection for distribution lines.

SYMAP® BC: Bus-tie Control for managing busbar segments.

SYMAP® T: Transformer Protection

SYMAP® G is a high-end digital protection relay from the German manufacturer Stucke Elektronik.

1 Unlike the integrated ECG model, the SYMAP® G is specifically dedicated to Generator Protection,

providing a comprehensive suite of electrical monitoring and safety functions to ensure the integrity of the alternator in power generation systems.

1. Product Description

SYMAP® G is a microprocessor-based protection device designed for low, medium, and high-voltage generators.

2 Its primary role is to detect electrical faults within the generator or between the generator and the busbar.

It offers high-precision measurement and rapid tripping capabilities to prevent catastrophic mechanical or electrical failure.

It is often used in systems where engine control is handled by a separate PLC or specialized controller, focusing purely on high-grade electrical protection.

2. Technical Parameter Table

Category    Specification

Power Supply    24V DC (Standard) or 110V/230V AC/DC (Optional)

Current Inputs    3-phase ($I_1. I_2. I_3$) + 1 Neutral ($I_o$) / 1A or 5A rated

Voltage Inputs    3-phase ($U_1. U_2. U_3$) + 1 Synch-Voltage / Up to 690V direct

Frequency Range    40 Hz – 70 Hz (Accuracy: 0.01 Hz)

Protection Functions    Overcurrent (50/51), Reverse Power (32), Over/Under Voltage (59/27), Over/Under Frequency (81U/O), Negative Sequence (46), Differential Protection (87G – optional)

Measurement Accuracy    Voltage/Current: 0.5%; Power/Energy: 1.0%

Communication    Modbus RTU/TCP, Profibus DP, CANopen, IEC 61850

Operating Temp    -20°C to +70°C

HMI Display    Backlit Graphic LCD with multi-language support

SYMAP®G

3. Related Models

The SYMAP® G series varies based on the complexity of the protection required:

SYMAP® G: Standard generator protection for basic and medium applications.

SYMAP® G-Diff: Enhanced version featuring Generator Differential Protection (ANSI 87G), used for large-scale generators to detect internal winding faults.

SYMAP® G-HV: High Voltage version designed to interface with Voltage Transformers (PTs) and Current Transformers (CTs) in MV/HV grids.

SYMAP®G

4. Application Cases

Commercial Shipping: Protection for main alternators on cargo ships, tankers, and cruise liners.

Power Plants: Used in thermal, hydro, or diesel power stations as the primary electrical safety guard for the generator.

Offshore Platforms: Reliable protection for generators operating in harsh environments with high vibration and salt mist.

Critical Infrastructure: Backup power systems for hospitals and data centers where generator stability is vital.

5. Product Advantages and Features

High Reliability: Features a multi-processor architecture (3-CPU system) to ensure that protection functions remain active even if the HMI or communication processor fails.

Comprehensive ANSI Library: Includes all standard protection codes required by international grid codes and maritime authorities.

Disturbance Recording: Captures high-resolution waveforms during fault events, allowing engineers to analyze the “root cause” of a trip.

Flexible Logic (PLC): Integrated “Boolean” logic editor allows users to create custom interlocking and alarm sequences without external hardware.3

Rugged Construction: Metal housing with excellent EMC shielding, certified by major classification societies (DNV, LR, ABS, etc.).

6. Other Models in the Same Series

Stucke Elektronik provides a modular ecosystem for the entire power plant:

SYMAP® EC: Engine Control only (governor and start/stop logic).

SYMAP® ECG: The “All-in-One” solution (Engine Control + Generator Protection).

SYMAP® F: Feeder Protection for outgoing distribution lines.

SYMAP® BC: Bus-tie Control for managing busbar couplers.

SYMAP® T: Transformer Protection for step-up or step-down units

SYMAP® F (Feeder Protection) is a digital multi-functional protection device specially designed by German Stucke Elektronik for feeders, outgoing circuits and distribution networks in the power system.

Unlike the ECG model which focuses on generator control, the core mission of SYMAP® F is to ensure the safety of the power distribution network and to quickly identify and isolate faults in the downstream circuits.

1. Product Description

SYMAP® F is an integrated digital protection relay, mainly used for monitoring and protecting the feeder circuits in medium and low voltage power distribution systems.

It can monitor the current, voltage and frequency of the line in real time. When a short circuit, overload or grounding fault occurs in the line, the device will precisely trigger the circuit breaker to trip. Its design follows the principles of “high reliability and high selectivity”, preventing large-scale power outages due to local faults.

2. Technical Parameter Table

Parameter Item    Technical Specification

Power Supply    24V DC or 110V/230V AC (optional configuration)

AC Measurement Input    3-phase current (I1. I2. I3) + 1 neutral current (Io); 3-phase voltage (U1. U2. U3)

Frequency Range    40 Hz – 70 Hz (support 50/60 Hz systems)

Protection Function (ANSI)    Overcurrent Protection (50/51), Neutral Overcurrent (50N/51N), Overvoltage/Undervoltage (59/27), Negative Sequence Protection (46)

Measurement Accuracy    Current/Voltage: 0.5 class; Power: 1 class

Logic Control    Internal programmable logic, supports circuit breaker interlock control

Communication Interface    RS485 (Modbus RTU), Profibus DP, or Ethernet (IEC 61850)

Display Interface    Backlit graphic LCD, supports real-time vector graph display

Enclosure Protection    Front panel IP54. complies with IEC 60529 standard

3. Related Models

The SYMAP® F family includes multiple variants for different grid environments:

SYMAP® F-L: Basic model, focusing on current protection, suitable for simple industrial feeders.

SYMAP® F-V: Voltage-enhanced version, featuring advanced voltage protection and frequency monitoring capabilities.

SYMAP® F-D: Directional Overcurrent Protection (67/67N), suitable for ring network distribution systems.

SYMAP® F-Compact: Compact design, suitable for use in extremely small distribution cabinets.

SYMAP®F

4. Application Cases

Industrial Distribution Network: Protection of outgoing circuits of distribution boards in large factories such as steel mills and chemical plants.

Ship power distribution system: Responsible for providing secondary protection from the main distribution panel to each distribution branch (such as lighting system, deck machinery, ventilation system).

Commercial buildings: Power distribution monitoring for high-demand locations such as data centers and hospitals.

Substation Automation: As the core protection unit of the medium-voltage switchgear, it communicates with the upper-level SCADA system.

SYMAP®F

5. Product Advantages & Features

Comprehensive fault recording: Built-in disturbance recorder (Disturbance Recorder) and sequence of events recording (SOE), facilitating the investigation of causes after an accident.

Multi-protocol communication capability: Supports the IEC 61850 international standard, enabling easy integration into modern digital substation systems.

Flexible protection curve: Offers a variety of commonly used inverse-time current protection curves (IDMT), and supports user-defined curves.

Modular design: The I/O interface can be expanded according to requirements, significantly enhancing the utilization rate of the hardware.

Sturdy and durable: Successfully passed rigorous tests for earthquake resistance, impact resistance and EMC electromagnetic compatibility, meeting the extreme environmental requirements of marine and heavy industry.

6. Other Models in the Same Series (Other models in the same series)

The SYMAP® series constitutes a complete power distribution protection ecosystem:

SYMAP® G: Generator-specific protection (Generator Protection).

SYMAP® T: Transformer Protection (Transformer Protection), featuring differential protection function.

SYMAP® Y: Motor Protection (Electric Motor Protection), focusing on start-up monitoring and overcurrent protection.

SYMAP® BC: Bus-tie Protection and Control (for managing busbar sectionalizing circuit breakers).

SYMAP® ECG is the core and best-selling all-in-one product of the German Stucke Elektronik brand.

1 It not only includes engine control functions, but also integrates complete generator protection functions.

1. Product Description

SYMAP® ECG is a two-in-one (2-in-1) integrated controller designed to manage both the “power source (engine)” and the “electricity output (generator)” simultaneously.

In traditional systems, a vehicle engine controller (such as EC) and an independent generator protection device are usually required. However, SYMAP® ECG integrates both into a single enclosure. It operates through three independent microprocessors to ensure a high level of redundancy and safety in the control logic and power protection. 2

2. Technical Parameter Table

Parameter Category    Technical Details

Power Supply    24V DC (tolerance 18V – 36V)

AC Measurement Input    3-phase voltage (up to 690V direct input), 3-phase current (+1 neutral current)

Frequency Range    40 Hz – 70 Hz

Processing System    3-CPU system (main control, measurement, independent watchdog monitoring)

Input/Output (I/O)    Approximately 10-18 programmable digital inputs / approximately 10-15 relay outputs

Analog Interface    Supports 4-20mA, 0-10V input (for pressure, temperature sensors)

Electrical Parameter Measurement    Active/Reactive Power, Power Factor ($\cos \phi$), Harmonic Analysis (THD)

Protection Response Time    < 40ms

Shell Material    Full metal enclosure, excellent electromagnetic compatibility (EMC)

Certification Standards    Complies with mainstream classification societies’ certifications (DNV, LR, ABS, BV, GL, CCS)

3. Related Models

SYMAP® ECG has multiple variants tailored for voltage levels and application scenarios:

SYMAP® ECG-C: Compact integrated solution, suitable for distribution cabinets with limited space.

SYMAP® ECG-D: Enhanced version, usually featuring differential protection (Differential Protection) function, designed for large generators.

SYMAP® ECG-H: High-voltage application version, connected via voltage transformer (PT).

SYMAP®ECG

4. Application Cases

Main power station of ships: Responsible for the automatic start-stop, synchronous grid connection and load distribution of the main generator sets on container ships and oil tankers.

Key facility backup power supply: For instance, emergency power generation units in hospitals and large data centers, extremely high startup success rate and flexible protection capabilities are required.

Offshore drilling platform: Managing high-power diesel generators on complex offshore platforms.

Mobile power station: Integrated control of containerized generator sets.

5. Product Advantages & Features

High integration: Reduces the number of components required for the unit control panel, minimizing the number of failure points and simplifying the wiring complexity.

Comprehensive protection library:

Engine protection: Over-speed, low oil pressure, high water temperature, sensor failure.

Generator protection: Overcurrent (50/51), Short circuit, Over/Under Voltage (27/59), Over/Under Frequency (81), Reverse Power (32), Loss of Magnetism (40).

Powerful synchronization function: Built-in automatic synchronizer, which can precisely control the closing of the circuit breaker and supports manual, semi-automatic and fully automatic modes.

Logic Programming (PLC): Supports complex logical control logic (Boolean Logic), and allows for customizing I/O behaviors according to specific requirements.

High reliability: Made in Germany, specially designed for extreme environments (vibration, high humidity, salt fog).

6. Other Models in the Same Series

The SYMAP® family encompasses all the nodes of the distribution network:

SYMAP® BC (Bus-tie Control): Bus tie control, used for segment management of busbars.

SYMAP® F (Feeder Protection): Feeder Protection: This is a device used for short-circuit and overload protection in power distribution circuits. 3

SYMAP® T (Transformer Protection): Transformer-specific protection. 4

SYMAP® Y (Motor Protection): High-power motor protection and start-up control.

SYMAP® EC (Engine Control) is a multi-functional digital integrated device specifically designed for engine control and automation,

launched by Stucke Elektronik (a part of the Stucke Group) in Germany.

1 It is one of the core models in the SYMAP® series, mainly used for monitoring the start, stop, and operation of diesel engines, gas engines, or turbines.

1. Product Description

SYMAP® EC is a microprocessor-based control terminal designed to provide a fully automated control solution for the power source (engine/motors) of power generation units.

It not only handles complex start/stop logic but also can monitor real-time operating parameters of the engine (such as speed, pressure, and temperature), and execute protective shutdown when abnormalities are detected.

Core positioning: Pure engine controller (does not include complex generator electrical parameter protection. If generator protection is required, the ECG model is usually selected.)

Hardware structure: It adopts a robust embedded design. The front panel is equipped with a graphical LCD and operation buttons, making it suitable for installation on switch cabinets or control panels. 2

SYMAP® EC

2. Technical Parameter Table

As the specific configurations may vary depending on the order number, the following are the general specifications for the standard model:

Parameter Item    Specification Details

Power Supply    24V DC (standard range is typically 12V – 36V DC)

Power Consumption    < 30 W

Processor    3 high-performance microprocessors (redundant monitoring, each serving as a Watchdog)

Display    Large-sized graphical LCD, supports multiple languages (English, German, French, Chinese, etc.)

Input/Output    Multiple digital inputs (DI), relay outputs (DO); supports 4-20mA analog input

Speed Measurement    Supports magnetic pickup sensor (Magnetic Pick-up) or pulse input

Communication Interface    RS232 (front panel), RS485/422. CANBUS, Modbus RTU/TCP, Profibus DP

Protection Grade    Panel front IP54 (IEC 529), terminal block IP10

Operating Temperature    -20°C to +70°C

SYMAP® EC

Event Storage    Up to 5.000 event logs can be recorded, and the data is not lost even in the event of power failure

3. Related Models (Related Models)

The SYMAP® series is divided into multiple sub-models based on application functions:

SYMAP® EC: Engine Control (Engine Control) 3

SYMAP® ECG: Engine Control + Generator Protection (the most commonly used integrated model). 4

SYMAP® G / F / T: Pure protection models specifically for generators (Generator), feeders (Feeder), and transformers (Transformer). 5

SYMAP® BC / Y / R: A series of variants designed for different installation forms (such as plug-in type, compact type).

SYMAP® Compact+: The latest generation of high-performance compact series.

4. Application Cases

Marine Engineering and Ships: Fully automatic control for main generators (Main Gensets) and emergency generators (Emergency Gensets).

Dynamic Positioning System (DP): As an independent power management terminal in DP2/DP3 class vessels.

Land power station: Backup power system control for hospitals, data centers or factories.

Hybrid power system: In recent years, it has also been applied to the hybrid power management for battery energy storage and grid connection of generators.

5. Product Advantages & Features

“1-Box Solution”: Integrates control, monitoring, logic alarm and communication functions, simplifying the wiring inside the control panel.

High security: An internal 3-CPU redundant architecture is adopted. Even if one of the processors fails, the critical protection functions can still operate through the other processors.

Built-in PLC function: Allows users to customize logical interlocks (such as circuit breaker locking conditions), without the need to add an additional small PLC. 6

Intuitive HMI: All parameter settings can be completed directly through the panel buttons and menus without the need to connect to a computer. 7

Class certification: Possesses type approval from major classification societies (such as DNV, GL, LR, ABS, BV, CCS).

6. Other Models in the Same Series

In addition to the core SYMAP® platform, Stucke also offers:

ECO® Series: A small-sized controller specifically designed for standalone applications, with optimized cost.

SYMAP® BAT: A battery energy management model specifically designed for use in inverter control. 8

SYMAP® Compact+ GC: Integrates advanced differential protection and a high-end protection controller that complies with IEC 61850 standards.