BWY2-804 / BWY2-806 Transformer Oil Surface Temperature Controller Type 2

Product Overview

The BWY2-804 / BWY2-806 Transformer Oil Surface Temperature Controller Type 2 is a temperature control instrument used for transformer oil temperature detection, local indication, alarm control, cooling system control and remote signal transmission. It is suitable for temperature detection and control of transformers and other electrical equipment and can operate reliably in outdoor and complex climate conditions.

This series can be equipped with 4 to 6 adjustable control switches, which can be used for transformer cooling system control, over-temperature alarm, signal output and protection linkage. It can also output 4-20mA standard current signals and Pt100 resistance signals corresponding to the measured temperature, making it suitable for computer monitoring systems, PLC, DCS, SCADA 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 volume 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 a built-in or external temperature transmitter, the product can output a standard 4-20mA signal or Pt100 signal to a background monitoring system, computer system or secondary instrument, enabling remote monitoring and unattended operation management of transformer oil temperature.

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. Cooling System Control
   Controls the start and stop of transformer cooling fans or cooling systems according to preset temperature values.
4. Over-Temperature Alarm
   Outputs alarm signals when the oil temperature reaches the preset alarm value, helping operators respond in time.
5. Switch Control Output
   Can be equipped with 4 to 6 adjustable switches for cooling control, alarm, protection and signal linkage.
6. 4-20mA Remote Output
   Supports 4-20mA standard current signal output for connection with PLC, DCS, SCADA and background monitoring systems.
7. Pt100 Signal Output
   Optional Pt100 resistance signal output for secondary instruments or temperature acquisition systems.
8. 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. Suitable for long-term use in outdoor 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.

Applications

The BWY2-804 / BWY2-806 Transformer Oil Surface Temperature Controller Type 2 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 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, 4-20mA remote output and optional Pt100 signal output, it helps users monitor transformer operating conditions, improve power equipment operation safety and enhance maintenance efficiency.