BWY-804 / BWY-806 Transformer Oil Surface Temperature Controller Type 1

Product Overview

The BWY-804 / BWY-806 Transformer Oil Surface Temperature Controller Type 1 is a temperature control instrument used for transformer oil temperature detection, local indication, alarm control and remote monitoring. Designed based on the composite temperature rise principle, it is suitable for temperature detection and control of transformers and other electrical equipment.

This series features reliable protection performance and can operate stably in outdoor and complex climate conditions. The instrument can be equipped with four to six adjustable control switches, which can be used for transformer cooling system control, over-temperature alarm and signal output. It can also output 4-20mA 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 BWY 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 control signals for starting or stopping the cooling system, helping control the transformer temperature rise.

With a built-in or external temperature transmitter, the instrument can output a standard 4-20mA signal to a computer system, background monitoring system or secondary instrument, enabling remote monitoring and centralized 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, recording and maintenance.
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. 4-20mA Remote Output
   Supports standard 4-20mA analog signal output for connection with PLC, DCS, SCADA and background monitoring systems.
6. Pt100 Signal Output
   Optional Pt100 resistance signal output for secondary instruments or temperature acquisition systems.
7. Remote Monitoring and Management
   Can be integrated with computer systems and automation monitoring systems for remote temperature acquisition and unattended operation management.

Technical Specifications

Measuring Range: 0℃ to 150℃, customizable according to user requirements
Accuracy Class: 1.5
Ambient Temperature: -40℃ to +55℃
Relative Humidity: <95%
Switch Performance: Four to six switches can be freely set within the full measuring range
Switch Action Error: ±2℃
Switch Differential: 6±2℃
Switch Rated Capacity: AC220V / 5A
Insulation Test: 2000V to ground, 50Hz, 60 seconds
Temperature Bulb Size: Φ14 × 150mm
Mounting Thread: M27 × 2
Cable Outlet Size: M20 × 1.5, 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: 100mm × 80mm or 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. Built-in temperature transmitter 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. Special dual bellows structure reduces the influence of ambient temperature changes on indication accuracy.
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.

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

Instrument Type:

Default: Type 1 instrument
2: Type 2 instrument

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:

BWY-804J: Type 1 instrument, AC220V power supply, 4-20mA output, four adjustable switches.
BWY-806B: Type 1 instrument, DC24V power supply, 4-20mA output, six adjustable switches.

Applications

The BWY-804 / BWY-806 Transformer Oil Surface Temperature Controller Type 1 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

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 BWY-804 / BWY-806 Transformer Oil Surface Temperature Controller Type 1 is mainly used for transformer oil temperature detection, indication, alarm, cooling control and remote monitoring. With local temperature indication, switch control output, 4-20mA remote output and optional Pt100 signal output, it helps users monitor transformer operating conditions, improve operation safety and enhance maintenance efficiency.