T154 Temperature control relay for encapsulated dry-type transformers

Description

The T154 temperature relay provides high-level protection against electromagnetic interference and ease of use, making it the benchmark for this application. It offers 3-phase transformer temperature control and a fourth option for centre or ambient temperature.

• The rear terminals are removable.
• It has 3 or 4 RTD PT100 inputs, and the input channels are protected against electromagnetic noise and overvoltage.
• Two output relays (Alarm-Trip): one output relay for fan control (FAN) and 1 relay for sensor failure or malfunction (TROUBLE)
• ABS self-extinguishing box NORYL 94VO
• IP65 polycarbonate panel
• Data storage: Minimum 10 years

Universal power supply with 24 to 240 Vac-dc input.

Options can be specified:

• RTD sensors in either platinum or nickel
• Channel alarm settings
• Tropicalisation of electronic boards
• Coupling with fans and alarms.
• Optional plastic front protection for the device

Contact us

The T154 thermal protection relay ensures the safety of dry or resin-coated transformers:

• Standard distribution transformer
• Dual voltage transformer
• Traction transformer
• Special dry-type transformers

We offer several PT100 probe references for connecting your transformer to the T154.

Refer to the user manual.

The owner of the equipment is responsible for and liable for any failure to comply with good usage practices and for any failure to deal with anomalies and defects in the field.

• Assembled in compliance with CE standards
• C-UL-US approval
• Protection against electrical and magnetic noise: IEC-EN61000-4-4
• Dielectric strength of 2500 V.C.A. for 1 minute from relays to sensors, from relays to power supply, from power supply to sensors
• Accuracy: +/- 1% total value, +/- 1 digit
• Vibration test IEC 68-2-6: Amplitude +/- mm from 2 Hz to 13.2 Hz – Acceleration +/- 0.7 G from 13.2 Hz to 100 Hz
• Seismic test according to IEEE 344-1,987

 

 

Temperature Monitoring Relay for Cast Resin Dry-Type Transformer T154

Thermal Relay for Dry-Type Transformer – Winding Monitoring and Protection

The Importance of Thermal Monitoring in Cast Resin Dry-Type Transformers

Thermal monitoring of a dry-type transformer is essential to prevent overheating, protect windings and ensure power supply continuity.

Winding temperature is one of the key factors determining the service life and operational reliability of a cast resin dry-type transformer. The TECSYSTEM T154 controller is designed to provide reliable thermal monitoring and to manage protection actions (alarm, ventilation, trip) in order to limit overheating and prevent unplanned outages.

SYNERDIS supports you in French, with the responsiveness of a close partner based in Lyon, at the crossroads of the Jura, Alps, Massif Central and Pyrenees regions, operating close to your sites and backed by the industrial expertise of KOLEKTOR ETRA.

From design to maintenance, we remain at your side to transform energy into electricity safely delivered to the grid.

Function of the T154 Temperature Monitoring Relay

A Complete Thermal Protection Relay – Beyond Simple Display

The TECSYSTEM T154 is a microprocessor-based digital temperature relay that:

• Measures temperature via RTD PT100 probes
• Clearly displays temperature values and relay status
• Triggers actions via configurable relay outputs (alarm / trip / fan control / fault)

It is designed for monitoring cast resin dry-type transformers used in MV/LV substations, railway and traction installations, dual-voltage applications and special applications, where thermal control directly determines operational continuity, installation availability and winding lifetime.

Temperature Measurement and Sensor Inputs

RTD PT100 Temperature Probe Configuration

The T154 temperature controller accepts 3 or 4 PT100 inputs:

• 3 channels for monitoring three-phase transformer windings
• 1 optional fourth channel for core or ambient temperature (depending on the selected monitoring architecture)

Input channels are protected against electromagnetic interference and overvoltage. The relay can signal sensor faults to prevent decisions based on incorrect measurements.

Thermal Protection and Overheating Management

Integrated Protection Logic

The T154 digital temperature controller implements progressive, site-configurable protection logic:

• Alarm: dedicated contact closure when a threshold is reached (operator information / SCADA supervision).
• Fan control: automatic activation of forced ventilation to improve cooling as load increases.
• Trip: activation of a safety relay (load disconnection / process shutdown / substation protection logic).
• Fault: dedicated relay in case of sensor or operating anomaly.

Result: coherent thermal protection that reduces the risk of winding damage and limits downtime.

Operation, Readability and Maintenance

Display and On-Site Diagnostics

Yes. The TECSYSTEM T154 provides:

• Clear digital temperature display
• LED status indicators for rapid cabinet-front diagnostics
• Removable rear terminals for simplified wiring and maintenance

Parameter Retention and Configuration Continuity

Yes. Data storage is specified for a minimum of 10 years, ensuring parameter retention (thresholds, hysteresis, configuration) during prolonged shutdowns or power outages.

Adaptation to Industrial Environments

Mechanical and Environmental Protection

• IP65 polycarbonate front panel
• Self-extinguishing ABS NORYL 94VO enclosure

A solution designed to withstand substation and industrial site constraints (dust, splashes, harsh environments).

Power Supply and Electrical Compatibility

The relay features a universal power supply input from 24 to 240 Vac/dc.

Standards Compliance, EMC and Testing

Regulatory Compliance and Certifications

• CE compliance for control and protection equipment
• C-UL-US certification available for international projects and North American standards

EMC and Dielectric Performance

• Protection against electrical and magnetic noise: IEC-EN 61000-4-4
• Dielectric strength: 2500 Vac / 1 minute (relay/sensors, relay/power supply, power supply/sensors)

Measurement Accuracy and Mechanical Testing

• Accuracy: ± 1 % full scale (± 1 digit)
• Vibration test: IEC 68-2-6
• Seismic test: IEEE 344

Options and Adaptation Accessories

Compatible Sensors and Probes

Options may include:

• Platinum or nickel RTD sensors
• Supply of compatible PT100 probe references for connection between the transformer and the T154

Configuration and Protection Options

• Channel alarm settings
• Tropicalization of electronic boards
• Integration with fans and alarm systems
• Plastic front protection (optional)

Installation and Maintenance

Commissioning and settings must be carried out in accordance with the user manual and best wiring practices (circuit separation, cable routing, sensor connection quality).

Fault management and anomaly treatment fall under site operating procedures.

Why Choose SYNERDIS and TECHNIKELEC for the T154 Temperature Monitoring Relay?

Expertise Applied to Thermal Protection of Dry-Type Transformers

For more than 10 years, SYNERDIS has distributed high-quality cast resin dry-type transformers from TRAFOELETTRO, all equipped with temperature monitoring relays, including the TECSYSTEM T154 controller.

The T154 temperature monitoring relay is part of a comprehensive thermal protection approach for cast resin transformers. Each transformer has its own thermal signature, and each site presents specific operating constraints: environment, ventilation, load cycles, supervision requirements and maintenance strategy.

For fast online purchases, through our TECHNIKELEC e-commerce platform, the T154 relay is supported by service that goes beyond simple equipment supply. Our teams assist you online and by phone in selecting references and ensuring delivery within 48 to 72 hours when equipment is in stock. Visit: www.technikelec.com

Dedicated Technical Support for the T154 Relay

The SANERGRID Group supports operators, integrators and maintenance teams at every stage of T154 deployment, including:

• Definition of temperature probe positioning within windings
• Alignment between thermal thresholds, alarms, trips and fan control
• Precise alarm and trip parameter configuration
• Interface with existing supervision or control systems

Depending on the project scope, support may range from simple supply of the T154 relay and accessories to full service including technical study, parameterization, commissioning tests and operator training.

SANERGRID Group: Specialist in MV / HV Transformer Equipment

With more than twenty years of experience, the SANERGRID Group is a recognized player in the high-voltage transformer sector — from supply and protection to industrial risk management including pollution, fire, vibration and environmental constraints.

This cross-disciplinary expertise ensures overall consistency between the T154 temperature relay and all SANERGRID solutions dedicated to reliability, protection and durability of dry-type transformers, particularly with our partner TRAFOELETTRO.

TECHNIKELEC: Simplified Access to Relays and Accessories

The TECHNIKELEC platform complements this ecosystem by facilitating online purchase and reservation of T154 temperature relays and related accessories.

This approach secures supply lead times and simplifies maintenance operations throughout the lifecycle of dry-type transformers.