Stucke Elektronik SYMAP®G generator 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

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.