BWR-04AJ(TH) Transformer Winding Thermostat Model Function and Installation Procedure

Date: July 7, 2025 08:52:27

BWR-04J Thermostat

BWR-04AJ(TH) is a kind of transformer winding thermostat, which is mainly used to measure and control the temperature of transformer winding. The following are its main technical parameters and functional characteristics:

Technical Parameter

  • Measurement range: 0~150°C.
  • accuracy class:: Level 2.0.
  • working conditions: Ambient temperature -40℃~+55℃, relative humidity ≤95%RH.
  • output signal: Simultaneous output of a Pt100 platinum resistance signal and a DC (4-20) mA current signal.
  • Switching Performance: Four groups of adjustable switches, can be set arbitrarily in the full range, the switch action error is ± 2 ℃, switching difference is 6 ± 2 ℃.
  • Switch Power Rating: AC220V/5A.
  • Warm Bag Size: Φ14×150mm, mounting thread M27×2.
  • Capillary length: 6 meters, can be extended to 18 meters according to user requirements.
  • protection class: IP55.

Functions and Applications

  • Working Principle: Adopting the principle of additional temperature rise, the current transformer through the current transformer to take out and load proportional to the current, adjusted by the power supply matching device input to the embedded in the temperature controller elastic element within the electric heating element, so as to simulate the measurement of the transformer top oil temperature and the winding to the average temperature rise of the oil superimposed temperature.
  • application scenario: Widely used in power transformer winding temperature detection and control, can realize the cooling system startup, shutdown, alarm signal output and other functions.
  • signal output: The output Pt100 platinum resistance signals and DC(4-20)mA current signals can be used in secondary instruments or computer systems to realize remote monitoring and automation control.
BWR-04AJ(TH) thermostats are suitable for a wide range of power systems and industrial applications because of their reliable performance and multiple functions, which can effectively guarantee the safe operation of transformers.
Installation steps for the BWR-04AJ(TH) thermostat are as follows:

Pre-installation

  1. Read the manual: Carefully read the installation and use instructions of the thermostat to understand its technical parameters, installation requirements and operation methods.
  2. Inspection equipment: Check that the thermostat and its accessories are complete and have no cosmetic damage to ensure that the equipment is in good condition.
  3. Preparation tools: Prepare the tools needed for installation, such as wrenches, screwdrivers, multimeters, etc.

Installation steps

  1. Mounting position selection::
    • Select a location that is well ventilated, free from strong magnetic field interference and free from corrosive gases.
    • Ensure that the installation location is easy to operate and maintain.
  2. Installing the thermostat body::
    • Mount the thermostat in a suitable location on the transformer, usually on the side or top of the transformer.
    • Secure the thermostat firmly using the mounting bracket to ensure it is stable.
  3. Installation of temperature packages and capillary tubes::
    • Install the temperature pack in a suitable location on the transformer windings, making sure that the temperature pack makes good contact with the windings.
    • The capillary tube should be laid along the transformer shell to avoid too small a bending radius and prevent damage.
  4. connect a wire::
    • Follow the wiring diagram in the manual to ensure that the wiring is correct and secure.
    • When wiring, you need to pay attention to the distinction between the power line, signal line and control line to avoid connecting the wrong.
  5. Inspection and commissioning::
    • Check that all connections are secure to ensure that there are no loose or weak connections.
    • After powering on the unit, check that the thermostat display is normal and that the functions are working properly.
    • Set the parameters of the thermostat as needed, such as alarm temperature, control temperature, etc.
  6. test run::
    • Before operating the transformer, perform a test run of the thermostat to ensure that it will work properly.
    • Check whether the output signal of the thermostat meets the requirements, such as Pt100 signal and DC(4-20)mA signal.

caveat

  • Avoiding Damage: Avoid collision or damage to the thermostat and sensor during handling and installation.
  • waterproof and damp-proof: Ensure that the thermostat is installed in a waterproof, moisture-proof environment.
  • maintenance: Regularly check the working condition of the thermostat to identify and deal with problems in a timely manner.
By following the above steps, you can ensure that the BWR-04AJ(TH) thermostat is installed correctly and works properly, so as to effectively monitor the temperature of the transformer windings and ensure the safe operation of the transformer.
Tags::