When replacing a temperature controller on an oil-immersed transformer, how do you verify the model information for the BWY and BWR models?

• When replacing the temperature controller on an oil-immersed transformer, first identify the oil-level temperature controller. BWY and Winding Thermostat BWRThe
• The Oil-Filled Thermostat section has published information on models such as the BWY-802, BWY-803A, BWR-04J, and BWR-06JTH.
• Before replacing the unit, verify the model number, the object to be measured, the installation method, the output signal, and the wiring requirements.

Replacing the temperature controller on an oil-immersed transformer is more...Dry-type transformer thermostatIt’s also important to first identify the object being measured. The term “oil temperature controller” used by the customer could refer to either an oil-level thermometer or a winding thermometer. A more appropriate title and focus for the content would be: “How to Verify Model Information Before Replacing BWY and BWR Units.”

This indicates that the product line covers two types of temperature controllers: oil-immersed and winding temperature controllers; however, specific replacements cannot be determined based solely on the model numbers BWY or BWR. Customers need to provide the model number of the old instrument, photos of its appearance, the installation location, details regarding the temperature sensor or wiring, and whether it includes remote transmission or alarm outputs.

If remote transmission signals are involved, specify the destination, such as a backend system, protection circuit, or field display. For retrofits of existing substations, also confirm whether the original instruments will be retained, whether new remote transmission capabilities will be added, and whether the alarm or trip logic will be modified. The specific number of contacts and output formats must be confirmed based on the documentation for the actual model.

If a customer simply wants to purchase replacement parts, you should still confirm that they are compatible with their existing equipment. For customers who are unsure whether they have a BWY or a BWR model, ask them to first provide the location of the thermostat on the transformer body and the text on the dial, so that technical staff can make a determination. This approach ensures the inquiry is meaningful without leading to overpromises.

When purchasing replacement parts, priority is typically given to matching the original model, wiring, and installation method; on-site modifications, however, may involve adding remote transmission capabilities, altering alarm circuits, or integrating with a backend system. Although both scenarios involve replacing a temperature controller, the required information is not entirely the same. To avoid misinterpretation, we recommend that customers provide the original instrument nameplate, installation interface, wiring terminals, transformer nameplate, and project objectives for confirmation.

Related FAQs

1. Are BWY and BWR interchangeable?

We do not recommend interpreting it this way. The two devices measure different targets and are used in different ways; they should be selected based on the original model and on-site requirements.

2. What is the most important factor to consider when replacing an oil-surface thermostat?

Consider the original model, mounting interface, temperature sensor or sensing element, and any alarm and remote transmission requirements.

3. What is required to replace a winding thermostat?

Please provide the original model number, photos of the meter face and wiring, and information about the relevant circuit or schematics.

4. Is it possible to select a transformer based solely on its capacity?

The capacity alone is not sufficient to determine the model; we also need the original instrument model number and on-site installation information.

5. Can you specify the exact number of terminals?

The specific number of terminals, output format, and wiring requirements must be confirmed based on the complete model number.