What Is Transformer Winding Temperature Monitoring? How It Works, Measurement Methods, and a Selection Guide
Date: August 14, 2026, 11:04:03
- Temperature Monitoring of Oil-Immersed Transformer Windings:Traditional approaches primarily useBWRSeries winding temperature controllers calculate the winding temperature reading by superimposing the analog temperature rise generated by the top-layer oil temperature and the load current.
- Temperature Monitoring of Dry-Type Transformer Windings:A Pt100 platinum resistance thermometer is typically used to directly measure the temperature near the windings, and the measurement is processed byBWDKOr the IB series thermostats handle display, fan control, and over-temperature alarms.
- Direct measurement of winding hot spots:For transformers operating at high voltage, with high capacity, or where accurate hotspot temperatures are required, fluorescent fiber-optic temperature sensors can be used, with the probes positioned at critical hotspot locations within the windings.
- When selecting a model, don’t just compare temperature measurement accuracy:We also need to confirm the transformer type, whether direct measurement is required, CT input, Pt100, 4–20 mA, RS-485, alarm contacts, cooling control, and backend communication requirements.
- Traditional WTI and fiber-optic temperature measurement are not based on the same principle:WTI in BWR-class reactors is primarily used for thermal simulation-based temperature measurement, whereas fluorescent optical fibers can directly measure the winding temperature at the probe’s location.
I. What Is Transformer Winding Temperature Monitoring?
Transformer windings are one of the primary heat-generating components during operation. When load current flows through the windings, copper losses occur, and as the load increases, the temperature of the windings also changes. If localized temperatures remain excessively high over an extended period, it will accelerate the aging of the insulation material; therefore, winding temperature is a critical parameter in transformer operational monitoring.
The so-calledTransformer Winding Temperature Monitoring...which involves obtaining winding temperature data through temperature sensors, thermal simulation devices, or fiber-optic sensors, and—depending on project requirements—enabling on-site display, alarms, cooling control, remote data transmission, or comprehensive online monitoring.
However, please note the following:
Different types of “winding temperature monitoring” do not necessarily measure the same temperature.
In traditional oil-immersed transformers, BWR winding thermometers typically do not involve installing temperature sensors directly inside the high-voltage windings; instead, they utilize the temperature of the top layer of oil in conjunction with the load current toThermal SimulationThe
Fluorescent fiber-optic temperature sensors, on the other hand, can be installed at key locations within the windings during the transformer manufacturing process to enable direct measurement of hot spot temperatures in the windings.
II. Why Is Monitoring Only the Transformer Oil Temperature Not Enough?
In oil-immersed transformers, the insulating oil serves both insulation and heat dissipation functions; therefore, the top-layer oil temperature is a key parameter for assessing the overall thermal condition of the equipment.
However, the oil temperature does not fully reflect the actual temperature at the hottest point inside the winding.
For example, when the load suddenly increases, copper losses in the windings rise rapidly, whereas the temperature of the insulating oil typically changes relatively slowly due to its high heat capacity. Consequently, the following may occur:
- The oil temperature at the top is still within the normal range.
- The temperature inside the winding has risen significantly
- Localized hot spots have temperatures higher than the average winding temperature
- There is a certain degree of thermal inertia in oil temperature changes.
Therefore, for oil-immersed power transformers that require more comprehensive temperature protection, the following are typically installed together:Oil level temperature monitoringrespond in singingWinding temperature monitoringThe
The oil surface temperature can be used toBWYSeries oil-immersed temperature controllers, and the winding temperature can be usedBWR Series Transformer Winding Temperature ControllersThe
III. What are the main methods for measuring transformer winding temperature?
Based on transformer type and measurement principles, the common methods for monitoring winding temperature can be classified into the following categories.
| Measurement method | Featured Products | Measuring principle | Main Applications |
|---|---|---|---|
| Hot Spot Simulation WTI | BWR Series | Top-Level Oil Temperature + Temperature Rise Simulated Under Load | Oil-immersed transformers |
| Pt100 Platinum Resistance Thermometer | BWDK / IB Thermostat | Changes in the Resistance of Platinum Resistors with Temperature | Dry-type transformer |
| Fluorescent fiber optic temperature measurement | Fiber-Optic Temperature Sensing System | Temperature-Dependent Fluorescence Lifetime | Direct Measurement of Winding Hot Spots |
| Comprehensive Online Monitoring | Smart Monitoring Terminal | Collect temperature and other operating parameters | Unmanned and Digital Substations |
Therefore, before selecting a winding temperature monitoring solution, the first step is not to choose a model, but rather to confirm:
Is it an oil-immersed or dry-type transformer? Do you need to simulate the winding temperature, or do you need to measure the winding hotspots directly?
IV. How does the temperature controller for the BWR windings in an oil-immersed transformer work?
Traditional winding temperature monitoring for oil-immersed transformers typically usesBWR Series Winding Temperature ControllersThe
The BWR winding temperature controller operates on the principle of additional temperature rise or thermal simulation. Rather than placing a metal temperature sensor directly into the high-voltage winding, it measures the temperature of the top layer of oil and then simulates the additional temperature rise of the winding relative to the oil temperature based on the transformer’s load current.
The Basic Operating Process of Thermal Simulation of WTI
The process can be simplified as follows:
Transformer load current → Current transformer (CT) → Current matching device → Heating element → Simulates winding temperature rise → Superimposed on top-layer oil temperature → Displays winding temperature
When the transformer’s load increases, the current on the secondary side of the CT changes accordingly, causing the heating element inside the thermostat to generate a corresponding temperature rise.
This additional temperature rise is added to the top-layer oil temperature measured by the temperature sensor, and the resulting value is displayed by the instrument as the simulated winding temperature.
Why does a BWR require a CT current signal?
Winding temperature is closely related to the load; therefore, traditional WTI systems need to measure the transformer’s load current.
If the CT ratio, current matching parameters, or temperature rise settings are incorrect, the simulated winding temperature displayed will also be inaccurate.
Therefore, when selecting a temperature controller for BWR windings, in addition to confirming the temperature range, it is also necessary to confirm the following:
- Transformer capacity
- Load Current
- CT Secondary Current
- CT Input Range
- Temperature Rise in Winding Design
- Number of alarm and control contacts required
- Is a Pt100 remote transmission required?
- Is a 4–20 mA output required?
V. What is the difference between the BWR-04 and the BWR-04J?
Innotongda offers a wide range of BWR series oil-immersed transformer winding temperature controllers, with common models including the BWR-04, BWR-04J, BWR-04AJ(TH), and other extended models.
You can viewBWR-04 Series Transformer Winding Temperature Controllers—Model NumbersLearn about the different configurations.
BWR-04
The BWR-04 is a basic winding temperature controller primarily used for analog measurement, on-site indication, and temperature control of the windings in oil-immersed transformers.
BWR-04J
The BWR-04J adds a current signal remote transmission function to its basic temperature monitoring and control capabilities, making it suitable for projects that require the transmission of winding temperature data to a control room or a backend data acquisition system.
BWR-04AJ(TH)
BWR-04AJ(TH) Transformer Winding Temperature ControllerIt can simultaneously provide both Pt100 platinum resistance signals and 4–20 mA DC current signals, making it particularly suitable for projects requiring multiple remote transmission interfaces.
VI. Main Technical Specifications of the BWR-04AJ(TH) Winding Temperature Controller
| Parameter items | BWR-04AJ(TH) |
|---|---|
| Product Type | Temperature Controller for Oil-immersed Transformer Windings |
| Measurement range | 0–150°C |
| accuracy class | Level 2.0 |
| environmental temperature | -40°C to +55°C |
| relative humidity | ≤95%RH |
| Remote Output | Pt100 + DC 4–20 mA |
| Control Switch | 4 sets of adjustable switches |
| Switch Setting Range | Fully adjustable |
| Switching action error | ±2°C |
| Switching Difference | 6±2°C |
| Switch Rated Capacity | AC 220 V/5 A |
| Warm Bag Size | Φ14 × 150 mm |
| Mounting Threads | M27×2 |
| Capillary length | Standard length is 6 m; can be extended to 18 m upon request |
| protection class | IP55 |
The measurement range, remote output, control contacts, and physical dimensions may vary among different BWR models; therefore, these specifications should be confirmed based on the specific model documentation at the time of purchase.
VII. What equipment can a BWR winding thermostat control?
The BWR is not only used to display winding temperatures, but can also be used to control transformer cooling and protection through multiple sets of temperature control contacts.
Typical features include:
- Cooling FansStart
- Cooling Fan Stopped
- Submersible Pump Control
- High Temperature Alarm
- Over Temperature Alarm
- Over-temperature trip signal
- Remote Temperature Display
- PLC or Back-End Temperature Data Acquisition
For projects requiring remote transmission capabilities, you can choose BWR models with output configurations such as Pt100 or 4–20 mA.
VIII. Does the traditional WTI measure the actual temperature of the winding hot spots?
Strictly speaking, the temperature controller for the windings in a traditional BWR displaysWinding temperatures obtained from thermal simulation, rather than the actual temperature measured by placing the sensor directly at the hottest point of the winding conductor.
This method has been used in engineering applications for a long time, is structurally mature, and does not require the direct installation of electrical temperature sensors inside the high-voltage windings.
However, because it relies on the top-layer oil temperature, load current, and a preset thermal model, there may be some discrepancy between the calculated temperature and the actual winding hotspot temperature during rapid load changes or when localized hotspots are present.
If the project requires direct measurement of the temperature of hot spots within the windings, fluorescent fiber-optic temperature measurement may be considered.
IX. How Can Fluorescent Fiber Optics Be Used to Directly Measure Hot Spots in Transformer Windings?
Fluorescent fiber-optic temperature measurement differs from the principles of traditional BWR thermal modeling.
The temperature probe uses an insulated optical fiber, with temperature-sensitive fluorescent material applied to the tip of the probe. The temperature measurement unit sends excitation light to the probe and calculates the temperature by analyzing the fluorescence decay characteristics.
Since temperature data is transmitted via optical signals, this technology is particularly well-suited for environments with high voltages and strong electromagnetic fields.
Key Features of Temperature Measurement Using Fluorescent Fiber-Optic Windings
- Optical fiber inherently possesses electrical insulation properties.
- Temperature signals are not transmitted via metal wires
- Not affected by strong electromagnetic interference
- Can be positioned at critical hot spots in the winding
- Ability to directly obtain the temperature at the probe location
- Suitable for multi-point synchronized temperature monitoring
- Can be connected to an integrated online monitoring system
For projects requiring a comparison of BWR, Pt100, and fiber-optic solutions, please refer toGuide to Selecting an Online Transformer Temperature Monitoring SystemThe
When is the best time to install a fiber-optic probe?
If it is necessary to measure actual winding hot spots inside an oil-immersed transformer, fiber-optic probes are generally best installed during the transformer’s manufacturing or major overhaul.
This is because the probe must be installed at predetermined hot spots in the winding and then connected to an external temperature measurement unit via a dedicated fiber-optic cable assembly.
Therefore, if it has been determined that direct measurement of winding hotspots is required for a new transformer project, it is best to establish the number and locations of temperature measurement points during the transformer design and manufacturing phases.
X. How does a Pt100 monitor the temperature of dry-type transformer windings?
Unlike the traditional BWR solution used in oil-immersed transformers, dry-type transformers generally use Pt100 platinum resistance thermometers to monitor winding temperature.
The Pt100 utilizes the characteristic that the resistance of platinum changes with temperature to perform measurements. The sensors are typically installed at relevant temperature measurement points on the windings of dry-type transformers and then connected toDry-type transformer thermostatThe
The temperature controller continuously measures three-phase or multi-channel Pt100 temperatures and performs the following functions:
- Three-Phase Winding Temperature Display
- Maximum Temperature Display
- Automatic Start and Stop of Fans
- Over Temperature Alarm
- Over-temperature tripping
- Sensor Failure Alarm
- 4–20 mA Remote Transmission
- RS-485 Communication
BWDK-S201Dry-type transformer thermostat
BWDK-S Series Dry-Type Transformer Temperature ControllerIt can be used in conjunction with a Pt100 sensor to monitor the temperature of dry-type transformer windings.
The BWDK-S201 series offers various configurations based on functional suffixes, such as basic temperature control, 4–20 mA output, RS-485 communication, and extended core temperature monitoring.
XI. Main Technical Specifications of the BWDK-S201
| Parameter items | BWDK-S201 |
|---|---|
| Main Applications | Temperature Monitoring of Dry-Type Transformer Windings |
| temperature sensor | Pt100 Platinum Resistance Thermometer |
| environmental temperature | -20°C to +55°C |
| Environmental humidity | ＜95%（25℃） |
| operating voltage | AC 220 V (+10%, -15%) |
| operating frequency | 50 Hz or 60 Hz (±2 Hz) |
| Measurement range | -30.0℃～240.0℃ |
| Measurement accuracy | ±1%FS |
| resolution (of a photo) | 0.1°C |
| Fan Output Capacity | 9A/250VAC |
| Control output capacity | 5A/250VAC; 5A/30VDC (resistive) |
| power wastage | ≤8W |
What are the differences between the various function codes for the BWDK-S201?
| model number | Key Features |
|---|---|
| BWDK-S201D | Temperature display, fan control, over-temperature alarm, over-temperature trip, and standard temperature control functions |
| BWDK-S201E | Adds a 4–20 mA analog output to the standard features |
| BWDK-S201F | Add RS485/232 communication capabilities to the standard features |
| BWDK-S201G | Add ambient temperature measurement and control |
| BWDK-S201I | Add transformer core temperature measurement and alarm functionality |
Different function codes can be combined according to project requirements; specific models and feature configurations can be confirmed prior to purchase.
12. What are the differences between BWR, Pt100, and fiber-optic fluorescence temperature measurement?
| Comparison Items | BWR Thermal Simulation WTI | Pt100 | fluorescent optical fiber |
|---|---|---|---|
| Main Applications | Oil-immersed transformers | Dry-type transformer | Temperature Measurement of Hot Spots in High-Voltage Windings |
| Measurement method | Indirect Heat Simulation | Contact Resistance Temperature Measurement | Optical Direct Temperature Measurement |
| Direct Measurement of Winding Hot Spots | 否 | Depends on the installation location | be in favor of |
| Is a CT scan necessary? | Required | unnecessary | unnecessary |
| Electrical Signal Leads | 有 | 有 | The temperature-sensing section uses fiber-optic transmission. |
| anti-electromagnetic interference | Suitable for general-purpose applications | Be aware of line interference | Not susceptible to electromagnetic interference |
| On-site Display | Mechanical Hands | As shown on the thermostat | As displayed on the temperature measurement unit |
| telecommunication | Based on model configuration | Implemented via a thermostat | This can be achieved using the temperature measurement host. |
XIII. Which winding temperature monitoring method should be selected for different types of transformers?
Conventional Temperature Protection for Oil-Immersed Transformers
If the main requirements of the project are:
- Winding Temperature Indication
- Fan or Oil Pump Control
- High Temperature Alarm
- Over-temperature tripping
- Traditional, Proven Solutions
Recommended: BWR Series Winding Temperature Controllers.
You can select based on remote transmission requirementsBWR-04, BWR-04J, and related modelsThe
Oil-immersed transformers require remote temperature signals
If, in addition to the on-site mechanical temperature display, you need to transmit the temperature to a PLC, RTU, or control room, you can choose a model with a Pt100 or 4–20 mA output.
For exampleBWR-04AJ(TH)It can provide both Pt100 and 4–20 mA remote transmission signals simultaneously.
Oil-immersed transformers require direct measurement of actual hot spots
If a project requires obtaining the actual temperature at key locations within the winding—rather than values from a thermal model simulation—fluorescent fiber-optic temperature measurement should be considered.
This solution is particularly well-suited for:
- Newly Manufactured Large-Capacity Power Transformers
- Monitoring of Hot Spots Inside High-Voltage Windings
- Environments with Strong Electromagnetic Fields
- Projects Requiring Multi-Point Temperature Measurement
- Applications with high requirements for real-time hotspot temperature
Temperature Monitoring of Dry-Type Transformer Windings
Standard dry-type transformers typically use a Pt100 in conjunction withBWDK or IB Series Dry-Type Transformer Temperature ControllersThe
If there are high-voltage, electromagnetic, or insulation requirements, a fiber-optic temperature measurement solution may also be selected based on project specifications.
14. What parameters need to be confirmed when selecting a winding temperature monitoring device?
Step 1: Identify the Transformer Type
First, confirm that:
- Oil-immersed transformers
- Dry-type transformer
- Enclosed Transformer
- Large Power Transformers
- Other Special Transformers
Different types of transformers use different methods of temperature sensing and temperature control.
Step 2: Determine whether it is a simulated temperature or the actual hotspot temperature
If routine operational safeguards are already sufficient, the BWR thermal simulation WTI may be used.
If accurate hot-spot temperatures within the winding are required, fiber-optic temperature sensors that can be installed directly inside the winding should be considered.
Step 3: Confirm the CT Input Requirements
When selecting a BWR winding temperature controller, you must verify the CT input parameters related to the transformer's load current.
When purchasing or replacing, we recommend providing:
- Original BWR Model
- Transformer capacity
- CT Turns Ratio
- CT Secondary Current
- Original Temperature Rise Setting Parameter
- Original Instrument Wiring Diagram
Step 4: Verify the Remote Signal
Common remote transmission methods include:
- Pt100
- 4-20mA
- RS485
- Other Custom Communication Interfaces
If you only need on-site display and temperature protection, you can choose the basic model.
If you need to connect to a PLC, DCS, RTU, or integrated online monitoring system, please confirm the signal interfaces before placing your order.
Step 5: Verify the Alarm and Control Contacts
The BWR temperature controller for oil-immersed transformers can be configured with multiple sets of temperature control contacts according to project requirements.
Common features include:
- Cooling Start for Group 1
- Cooling Start for the Second Group
- High Temperature Alarm
- Over-temperature tripping
The specific number of contacts and operating temperature should be determined based on the transformer's cooling system and protection logic.
Step 6: Verify the machine installation parameters
For the project to replace thermostats on old transformers, the following also needs to be confirmed:
- Temperature Probe Diameter
- Temperature Probe Length
- Mounting Threads
- Capillary length
- Instrument Installation Location
- Original mounting bracket
- wiring terminal
If the model has been discontinued or cannot be directly identified, please provide the original product nameplate, on-site photos, and dimensions so that the manufacturer can assist in selecting a replacement.
XV. When should winding temperature data be integrated into the comprehensive online monitoring system?
Traditional WTI primarily addresses on-site display, alarm, and cooling control issues, while comprehensive online monitoring focuses more on the continuous recording and remote analysis of temperature data.
If a project has the following requirements, consider integrating winding temperature monitoring into the transformer online monitoring system:
- Unattended substations
- Remote Monitoring of Winding Temperature
- Centralized Monitoring of Multiple Transformers
- Temperature Trend Log
- Combined Load and Temperature Analysis
- Comparison of Oil Temperature and Winding Temperature
- Remote Alarms
- Integration of the Comprehensive Online Monitoring Platform
For projects that require simultaneous monitoring of temperature and other operating conditions, you may also refer toOil-immersed transformer integrated condition monitoring deviceThe
XVI. What are the most common selection errors in winding temperature monitoring?
1. Think of the WTI as a temperature sensor located directly inside the winding.
In traditional BWR WTI systems, thermal simulation is typically used; therefore, the displayed values represent simulated winding temperatures rather than actual measurements taken by probes directly mounted on the conductor hot spots.
If the project explicitly requires “Direct Winding Hot Spot Temperature Measurement,” further confirmation is needed as to whether direct fiber-optic temperature measurement is required.
2. Check only the temperature range; do not verify the CT parameters
The simulated temperature rise of a BWR winding temperature controller is related to the load current. If the CT input is not properly configured, the correct simulated winding temperature may not be obtained, even if the temperature gauge itself is functioning normally.
3. Mixed Use of Temperature Controllers for Oil-Filled and Dry-Type Transformers
The BWR temperature controllers for oil-immersed transformers and the BWDK temperature controllers for dry-type transformers differ in their temperature measurement principles, sensors, installation configurations, and applications; therefore, they cannot simply be interchanged.
4. Consider only local display; do not consider remote transmission
If the project will need to integrate SCADA, PLC, or comprehensive online monitoring systems at a later stage, the appropriate interfaces—such as Pt100, 4–20 mA, or RS-485—should be confirmed during the selection phase.
5. The new transformer requires fiber-optic temperature monitoring, but this was not included in the original design.
For fiber-optic probes installed inside the windings, it is best to design the temperature measurement points and lead-out structures in advance during the transformer manufacturing stage. If these are added after the transformer has been manufactured, the installation process will become significantly more difficult.
XVII. Frequently Asked Questions (FAQ) on Transformer Winding Temperature Monitoring
1. Does the WTI transformer winding thermometer measure the winding temperature directly?
In traditional oil-immersed transformers, BWR winding temperature sensors typically do not measure temperature directly. Instead, they primarily estimate the additional winding temperature rise based on the top-layer oil temperature and load current, and then display the estimated winding temperature.
If you need to directly measure hot spots in internal windings, you may want to consider using a fluorescent fiber-optic temperature sensor.
2. How should I choose between the BWR-04 and the BWR-04J?
If your primary need is for on-site temperature display and control, you can choose the BWR-04 series based on its basic functions. If you also require remote temperature transmission, you will need to further confirm which models—such as the BWR-04J or BWR-04AJ(TH)—include remote transmission capabilities.
3. Why does the BWR winding temperature controller require a CT?
Because a BWR must simulate the additional temperature rise caused by copper losses in the windings based on the transformer's load current, the CT is responsible for providing the current signal related to the transformer's load.
4. Can a BWR winding temperature controller be used with a dry-type transformer?
This method is not typically used. Dry-type transformers primarily use Pt100 temperature sensors in conjunction with BWDK or IB series electronic temperature controllers to monitor winding temperature.
5. Can a Pt100 be placed directly in the high-voltage winding of an oil-immersed transformer?
Standard Pt100 sensors have electrical leads; when used inside high-voltage windings, insulation and the electromagnetic environment must be taken into account. Therefore, standard Pt100 sensors cannot simply be used as a substitute for optical fibers for direct temperature measurement at hot spots in conventional oil-immersed high-voltage windings.
6. Can fiber-optic temperature measurement and BWR be used simultaneously?
Yes. The functions of the two systems do not conflict. The BWR can continue to handle traditional on-site temperature indication, alarms, and cooling control, while the fiber-optic system is used to obtain direct temperature data from critical winding locations.
XVIII. Product Features Can Be Customized
Different transformers vary in terms of winding structure, temperature rise design, CT parameters, control logic, communication interfaces, and installation space; therefore, winding temperature monitoring devices can be selected and configured according to the specific requirements of each project.
Content that can be confirmed or customized based on project requirements includes:
- BWR Winding Thermostat Models and Feature Configurations
- Temperature measurement range
- CT Input Range and Temperature Rise Matching
- Pt100 Remote Output
- 4–20 mA analog output
- RS-485 and Other Communication Interfaces
- Number of Alarm and Trip Contacts
- Cooling Fan or Oil Pump Control Logic
- Capillary length
- Temperature Sensor Dimensions and Mounting Interfaces
- Number of Pt100 Temperature Measurement Channels in a Dry-Type Transformer
- Multi-Channel Fiber-Optic Winding Hotspot Temperature Measurement
- Integration of the Comprehensive Online Monitoring System
- Special Project Features and Model Substitutions
Need to select or customize a transformer winding temperature monitoring device?
If you are unable to identify a suitable product based on the existing model, please provide the transformer type, capacity, voltage rating, original thermostat model, CT parameters, on-site photos, installation dimensions, and the required output and communication functions.
For projects involving the replacement of older models, substation retrofits, remote monitoring, comprehensive online monitoring, and direct fiber-optic temperature measurement of windings, please feel free to contact us to discuss specific solutions.
For traditional winding temperature control products for oil-immersed transformers, see:BWY/BWR Oil-immersed Transformer Temperature ControllerThe
For dry-type transformer temperature monitoring products, please see:Dry-type transformer thermostatThe
XIX. Summary of Transformer Winding Temperature Monitoring Selection Criteria
There is more than one technical solution for monitoring transformer winding temperatures.
If that's the case,Temperature Display, Alarms, and Cooling Control for Conventional Windings in Oil-Filled Transformers...you may want to consider the BWR series thermal simulation winding temperature controllers as your first choice.
If that's the case,Temperature Monitoring of Three-Phase Windings in Dry-Type Transformers...typically uses a Pt100 in combination with a BWDK or IB series temperature controller.
If the project requiresDirectly measure the actual hotspot temperature inside the high-voltage winding...a fluorescent fiber-optic temperature measurement solution can be used.
If you need moreRemote communication, historical trends, comprehensive online monitoring, or unattended operation, then you should further configure a 4–20 mA, RS-485, or integrated online monitoring terminal.
Therefore, the correct sequence for selecting a model should be:
First, confirm the transformer type → Determine whether simulated temperature or direct hotspot temperature is required → Confirm the control functions → Confirm the remote transmission interface → Finally, determine the specific product model.
statement denying or limiting responsibility
This article introduces the common principles, measurement methods, product types, and selection criteria for transformer winding temperature monitoring. It is intended solely for technical exchange and as a reference for product selection, and does not constitute a basis for specific engineering design or a procurement commitment.
There may be significant differences among transformers in terms of structure, capacity, voltage rating, winding temperature rise design, CT parameters, and control system requirements. The product models, measurement ranges, output methods, contact ratings, mounting dimensions, communication functions, and other technical parameters mentioned in this document are subject to the actual product technical documentation, drawings, technical agreements, and final delivery configuration.
When installing transformer alarms, trip devices, cooling system interlocks, CT circuits, and internal sensors in high-voltage windings, the design, installation, and commissioning shall be performed in accordance with the transformer manufacturer’s technical requirements, project design specifications, and applicable standards.
