Stucke Elektronik SYMAP®T transformer protection
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.
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.