Simulated winding temperature based on top-oil temperature and load-current heating
The final implementation follows the confirmed model code, outline drawing and terminal diagram.
Winding Temperature Indicators manufacturer
BWR2 Transformer Winding Temperature Indicator
A mechanical WTI gauge and compound transmitter for simulated winding temperature indication on oil-immersed transformers, with adjustable contacts and remote signal options.
BWR2 Functions for Transformer Temperature Control
Confirm how the selected configuration will indicate temperature, operate contacts and communicate with the remote system.
Four adjustable contacts for cooling, alarm and trip circuits
The final implementation follows the confirmed model code, outline drawing and terminal diagram.
Pt100 output with 4-20 mA and remote display options by configuration
The final implementation follows the confirmed model code, outline drawing and terminal diagram.
BWR2 Technical Specifications
Use these values for initial comparison, then confirm the selected suffix, options and project interfaces in the current model documents.
| Operating ambient | -40°C to +65°C |
|---|---|
| Relative humidity | Up to 95% at 25°C |
| Measuring range | 0°C to 160°C |
| Accuracy | Class 1.5; stated maximum error ±2.4°C |
| Switch contacts | 4 adjustable contacts |
| Switch rated power | AC 220 V / 5 A |
| Remote signal options | Pt100; 4-20 mA by selected configuration |
| Capillary length | Defined by the final model code and project layout |
| Protection grade | IP55 |
| Common models | BWR2-06AJ(TH), BWR2-05J(TH), BWR2-04AJ(TH), BWR2-04J(TH) |
BWR2 Product Overview
The BWR2 is a winding temperature indicator, often abbreviated WTI, for oil-immersed transformers. It does not place an electrical sensor directly inside the conductor. The system combines the measured top-oil temperature with a load-current-related heating effect in a compound transmitter. The pointer therefore represents a simulated winding temperature that can support operating decisions, cooling control and protection logic.
This product family is used when the project needs a durable local dial, adjustable switching contacts and an output for remote indication. Several model suffixes define the contact arrangement, signal method and environmental configuration. A replacement order should never rely on the BWR2 family name alone. The complete model, current-transformer input, existing pocket arrangement and wiring must be compared.
How Does the BWR2 Temperature Measurement Work?
The temperature bulb responds to the transformer top-oil temperature. A current signal proportional to transformer loading is supplied from a current transformer to the compound transmitter. Its heating element adds a calibrated thermal rise to the sensing system. With no load, the indicated value follows top-oil temperature. Under load, the added rise moves the indication toward the calculated winding temperature.
The adjustable contacts can be assigned to cooling stages, alarm or trip functions according to the transformer protection design. Contact set points belong to the project commissioning record. They should be coordinated with the transformer thermal design, cooling stages and upstream protection scheme rather than copied from an unrelated installation.
How to Select the BWR2
Provide the complete existing BWR2 model code, number and purpose of switch contacts, required signal output, CT secondary current, capillary length, remote display requirement and environmental conditions.
Confirm whether the order is for a new transformer or a retrofit. A retrofit also requires the existing mounting dimensions, thermometer pocket, bulb arrangement, cable entries and terminal diagram.
BWR2 Installation and Commissioning
Install the indicator vertically where the dial can be read and serviced. Protect the capillary from crushing, sharp bends and vibration. Insert the sensing bulb into the specified compound transmitter and thermometer pocket arrangement, then secure the route at suitable intervals.
Before energization, verify the contact continuity, terminal mapping, current-transformer circuit and remote output against the model-specific diagram. Functional testing should confirm local indication, each cooling or alarm stage and the receiving panel signal.
BWR2 Transformer Applications
Power transformer winding temperature indication
Confirm the measurement point, contact logic, output and mechanical interface against the transformer project documents.
Cooling fan or pump stage control
Confirm the measurement point, contact logic, output and mechanical interface against the transformer project documents.
Over-temperature alarm and trip protection
Confirm the measurement point, contact logic, output and mechanical interface against the transformer project documents.
Retrofit of BWR-family winding thermometers
Confirm the measurement point, contact logic, output and mechanical interface against the transformer project documents.
Specifications and available options vary by model configuration. Request the current datasheet, outline drawing and terminal diagram before approving an order.
Related BWR2 Selection Resources
Compare the Product Category
Review other models for the same transformer temperature measurement and control function.
Compare winding temperature indicatorsPlan Cooling, Alarm and Trip Control
Review how OTI and WTI contacts support transformer cooling stages and protection logic.
Transformer cooling and protection applicationPrepare a Replacement
Compare existing codes, outputs, capillary routing and mounting interfaces before a controller replacement.
Transformer OTI and WTI replacement guideReview Supplier Documents
Check available management-system, conformity and qualification materials for procurement review.
Certification and qualification documentsDirect engineering contact
Request BWR2 Selection and Pricing
Email the transformer type, model reference, measuring range, output, switch contacts, capillary length, quantity and destination country. INNO will reply with the applicable configuration details.