BWR2-04 / BWR2-06 Transformer Winding Temperature Controller Type 2 with BL-F Composite Transmitter

Product Overview

The BWR2-04 / BWR2-06 Transformer Winding Temperature Controller Type 2 is a dedicated temperature control instrument for oil-immersed transformer winding temperature monitoring, local indication, alarm control and remote monitoring. Designed based on the additional temperature rise principle, it works together with the BL-F composite transmitter to realize winding temperature simulation, signal conversion, control output and remote transmission.

The product mainly consists of the winding temperature controller body, temperature bulb, capillary tube, elastic element, microswitches, temperature transmitter and BL-F composite transmitter. It can output Pt100 resistance signals or 4-20mA standard current signals, making it suitable for PLC, DCS, SCADA, secondary instruments and background monitoring systems.

Working Principle

The temperature bulb of the BWR2 winding temperature controller is installed in the top oil pocket of the transformer tank to detect the transformer top oil temperature. Under no-load condition, the indicated temperature mainly reflects the transformer top oil temperature.

When the transformer operates under load, the current taken from the secondary side of the transformer current transformer is input into the BL-F composite transmitter. The CT input current can be adjusted by dial settings to meet different temperature rise requirements. According to the load current, the transmitter generates corresponding temperature rise compensation, enabling the instrument to indicate a simulated winding hot-spot temperature based on both top oil temperature and additional temperature rise.

The product can transmit temperature data to the background system through Pt100 signal or 4-20mA standard signal, enabling remote monitoring, alarm linkage and automation control.

Main Functions

1. Winding Temperature Monitoring
   Used to monitor the operating temperature of oil-immersed transformer windings and help evaluate transformer load condition and operating safety.
2. Local Temperature Indication
   Provides direct on-site indication of simulated winding temperature for inspection, recording and maintenance.
3. BL-F Composite Transmitter Integration
   Equipped with the BL-F composite transmitter for CT current input, temperature rise compensation, signal conversion and remote transmission.
4. Pt100 Signal Output
   Supports Pt100 resistance signal output for secondary instruments, temperature acquisition systems and automation monitoring systems.
5. 4-20mA Remote Output
   Optional 4-20mA standard current signal output for connection with PLC, DCS, SCADA and background monitoring systems.
6. Temperature Alarm Control
   Outputs alarm signals when the winding temperature reaches the preset alarm value, helping operators respond in time.
7. Cooling System Control
   Controls the start and stop of transformer cooling fans or cooling systems according to temperature changes.
8. Trip Protection
   Can be connected with trip protection devices when the winding temperature exceeds the safe limit, reducing the risk of transformer overheating and failure.
9. Remote Monitoring and Management
   Can be integrated with computer monitoring systems for remote temperature acquisition, transmission and centralized management.

BWR2 Controller Technical Specifications

Measuring Range: 0℃ to 160℃
Accuracy Class: 2.0
Ambient Temperature: -40℃ to +55℃
Relative Humidity: <95%
Switch Performance: 4 to 6 adjustable switches
Switch Action Error: ±2℃
Switch Differential: 3℃ to 6℃
Switch Rated Capacity: AC220V / 3A
Insulation Test: 2000V to ground, 50Hz, 60 seconds
Temperature Bulb Size: Φ9 × 120mm
Mounting Thread: M27 × 2
Cable Outlet Size: Standard Φ15 hose connector, optional Φ20 hose connector
Capillary Length: 6m, maximum customizable length 18m
Protection Grade: IP55
Overall Dimension: 304mm × 192mm × 153mm
Mounting Dimension: 2-Φ9, center distance 140 to 144mm; or 3-Φ7, 210mm × 144mm

BL-F Composite Transmitter Technical Specifications

Product Name: BL-F Composite Transmitter
Overall Dimension: 290mm × 180mm × 180mm
Application: Suitable for temperature rise and sensing transmission devices of BWR2-04 series winding temperature controllers
Ambient Temperature: -40℃ to +55℃
Relative Humidity: <95%
Input Signal: Transformer CT secondary output current, 0.5A to 5.0A
Output Signal: Pt100 resistance signal or 4-20mA standard current signal
Note: 4-20mA output requires TC-152 temperature transmitter
Mounting Thread: M27 × 2 or M33 × 2
Temperature Bulb Size: Φ15mm, insertion depth not less than 150mm
Protection Grade: IP55

Performance Features

1. High-frequency welding process ensures reliable sealing and prevents leakage.
2. Mechanical fatigue-resistant structure provides long-term accuracy and durability.
3. Multiple output signal options are available with stable signal transmission.
4. Temperature transmitter output adopts photoelectric isolation, with isolation voltage up to 2000V.
5. Lightning protection circuit design makes the product suitable for areas with frequent lightning.
6. Mechatronic integrated design with compact structure and easy maintenance.
7. Multi-turn spring tube technology and bimetal ambient temperature compensation are adopted.
8. The error between the instrument body and the background monitoring system is less than ±2℃.
9. The instrument can be maintained without power shutdown.
10. The BL-F composite transmitter features compact design and convenient installation.
11. The BL-F composite transmitter has strong compatibility and can be used with similar winding temperature controllers from domestic and international manufacturers.
12. The CT input current can be adjusted by dial settings to meet different temperature rise requirements.
13. Mounting thread options provide strong compatibility for different installation conditions.

Model Description

BWR stands for Transformer Winding Temperature Controller.

Instrument Type:

2: Type 2 instrument

Switch Quantity:

04: Four adjustable switches
05: Five adjustable switches
06: Six adjustable switches

Function Code:

Default: No remote transmission signal
B: DC24V power supply, 4-20mA output
J: AC220V power supply, 4-20mA output
JJ: AC220V power supply, dual 4-20mA output
Y: Resistance signal output
A: Pt100 signal output
AJ: Pt100 signal and 4-20mA signal output
AA: Dual Pt100 signal output

Protection Condition:

TH: Humid tropical protection
TA: Dry tropical protection
T: Dry and humid tropical protection

Model Examples:

BWR2-04A: Type 2 instrument, Pt100 signal output, four adjustable switches.
BWR2-06AJ: Type 2 instrument, Pt100 signal and 4-20mA signal output, six adjustable switches.

Applications

The BWR2-04 / BWR2-06 Transformer Winding Temperature Controller Type 2 with BL-F Composite Transmitter is suitable for:

Power transformers
Oil-immersed transformers
Substations
Distribution rooms
Power distribution systems
Industrial electrical equipment
Electrical switchgear equipment
Transformer cooling control systems
Transformer winding temperature monitoring systems
Transformer over-temperature alarm systems
Remote temperature monitoring systems
Unattended substations

Applicable Industries

Power industry
Transmission and distribution industry
Substation construction
Industrial automation
Energy infrastructure
Electrical equipment manufacturing
Power operation and maintenance systems
Industrial and mining power distribution systems

Product Application

The BWR2-04 / BWR2-06 Transformer Winding Temperature Controller Type 2 with BL-F Composite Transmitter is mainly used for oil-immersed transformer winding temperature detection, indication, alarm, cooling control, trip protection and remote monitoring. With CT current input, additional temperature rise compensation, Pt100 signal output or 4-20mA standard signal output, it helps users achieve accurate transformer winding temperature monitoring and improve the operating safety and maintenance efficiency of power equipment.