WTI

BWR-04(TH) Series Transformer Winding Temperature Controller

The BWR-04(TH) series transformer winding temperature controller is a specialized instrument designed based on the principle of additional temperature rise. It features excellent protection performance and can operate normally under outdoor conditions, making it widely suitable for temperature measurement and control of transformers and other equipment. The instrument is equipped with four to six adjustable control switches, which can be used respectively for transformer cooling system control, signal alarms, overtemperature tripping, and other functions as required.

Through a temperature transmitter or Pt100 platinum resistor embedded in the primary meter, it outputs a DC (4-20) mA current signal or Pt100 platinum resistor signal corresponding to the temperature value, for use by computer systems and secondary instruments, enabling unmanned substation management.

Technical Specifications:

• Power Supply for Temperature Transmitter:​ AC/DC (100–260) V, Frequency 50 Hz
• Output Signal:​ Passive or active DC (4–20) mA current signal
• Operating Conditions:​ Ambient temperature (-40 ~ +55) °C, Relative humidity ≤ 95% RH
• Measurement Range:​ (0 ~ 150) °C
• Accuracy:​ Class 2.0 (per standard JB/T8450-2005)
• Switch Performance:​ Four adjustable switches, each can be set arbitrarily within the full range (up to 6 switches available upon request)
• Switch Set Points:​ K1 = 50°C, K2 = 75°C, K3 = 100°C, K4 = 120°C
• Switch Operating Error:​ ±2°C; Switch differential: (6 ± 2) °C
• Switch Rated Power:​ AC 220V / 5A, DC 220V / 3A
• Bulb Dimensions:​ Φ14 mm, immersion depth ≥ 150 mm
• Mounting Thread:​ (M27 × 2) mm or (M33 × 2) mm
• Capillary Tube Length:​ 6 m (maximum customizable length up to 18 m)
• Protection Rating:​ IP55