BWY2-804 / BWY2-806 Transformer Oil Surface Temperature Controller Type 2 with BL-FC High-Temperature Composite Sensor

Product Overview

The BWY2-804 / BWY2-806 Transformer Oil Surface Temperature Controller Type 2 is a temperature control instrument used for oil-immersed transformer oil temperature detection, local indication, alarm control, cooling system control and remote signal transmission. Equipped with a BL-FC high-temperature composite sensor, it is suitable for transformer oil temperature acquisition and signal transmission in long-term power equipment operation environments.

This series provides reliable outdoor protection performance and can operate stably under complex climate conditions. The instrument can be equipped with 4 to 6 adjustable control switches for transformer cooling system control, over-temperature alarm, signal output and protection linkage. According to the selected model, it can output Pt100 resistance signals or 4-20mA standard current signals for connection with PLC, DCS, SCADA, computer monitoring systems and secondary instruments.

Working Principle

The BWY2 series transformer oil surface temperature controller is mainly composed of an elastic element, capillary tube, temperature sensing bulb, temperature transmitter and temperature indication mechanism. The sealed system formed by the elastic element, capillary tube and sensing bulb is filled with temperature-sensitive medium.

When the measured temperature changes, the volume of the temperature-sensitive medium inside the sensing bulb changes accordingly. This change is transmitted to the elastic element inside the instrument through the capillary tube, causing the pointer to rotate and indicate the measured temperature. At the same time, the instrument can drive microswitches to output switch control signals for starting or stopping the transformer cooling system, helping control transformer temperature rise.

With the BL-FC high-temperature composite sensor, the product can realize oil temperature acquisition, sensing signal transmission and remote temperature monitoring. Through Pt100 signal or 4-20mA standard signal, temperature data can be transmitted to the background monitoring system for unattended operation management and automation control.

Main Functions

1. Oil Temperature Monitoring
   Used to detect the oil surface temperature of oil-immersed transformers and help monitor transformer operating conditions.
2. Local Temperature Indication
   Provides direct on-site temperature indication for inspection, reading and recording.
3. BL-FC High-Temperature Composite Sensor
   Equipped with a BL-FC high-temperature composite sensor for oil temperature acquisition, sensing signal transmission and stable detection in high-temperature environments.
4. Cooling System Control
   Controls the start and stop of transformer cooling fans or cooling systems according to preset temperature values.
5. Over-Temperature Alarm
   Outputs alarm signals when the oil temperature reaches the preset alarm value, helping operators respond in time.
6. Switch Control Output
   Can be equipped with 4 to 6 adjustable switches for cooling control, alarm, protection and signal linkage.
7. Pt100 Signal Output
   Optional Pt100 resistance signal output for secondary instruments, temperature acquisition systems and automation monitoring systems.
8. 4-20mA Remote Output
   Optional 4-20mA standard current signal output for connection with PLC, DCS, SCADA and background monitoring systems.
9. Remote Monitoring and Management
   Can be integrated with computer monitoring systems for remote temperature acquisition, transmission and centralized management.

Technical Specifications

Measuring Range: 0℃ to 160℃ or -20℃ to 140℃
Accuracy Class: 1.5
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: Φ14 × 150mm
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: 182mm × 174mm × 108mm
Mounting Dimension: 2-Φ9, center distance 140 to 144mm; or 3-Φ7, 210mm × 144mm

Performance Features

1. High-frequency welding process ensures reliable sealing and prevents liquid 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 convenient 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. Equipped with a BL-FC high-temperature composite sensor for transformer oil temperature detection and remote signal transmission.
11. Suitable for long-term use in outdoor, substation and complex power operation environments.

Model Description

BWY stands for Transformer Oil Surface Temperature Controller.

Instrument Type:

2: Type 2 instrument

Switch Quantity:

804: Four adjustable switches
805: Five adjustable switches
806: Six adjustable switches

Function Code:

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

Protection Condition:

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

Model Examples:

BWY2-804A: Type 2 instrument, Pt100 signal output, four adjustable switches.
BWY2-806AJ: Type 2 instrument, Pt100 signal and 4-20mA signal output, six adjustable switches.
BWY2-804J: Type 2 instrument, AC220V power supply, 4-20mA output, four adjustable switches.
BWY2-806B: Type 2 instrument, DC24V power supply, 4-20mA output, six adjustable switches.

Applications

The BWY2-804 / BWY2-806 Transformer Oil Surface Temperature Controller Type 2 with BL-FC High-Temperature Composite Sensor 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 oil 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 BWY2-804 / BWY2-806 Transformer Oil Surface Temperature Controller Type 2 with BL-FC High-Temperature Composite Sensor is mainly used for transformer oil temperature detection, indication, alarm, cooling control and remote monitoring. With local temperature indication, 4 to 6 adjustable switch outputs, Pt100 signal output or 4-20mA standard signal output, it helps users monitor transformer operating conditions, improve power equipment operation safety and enhance maintenance efficiency.