Transformer Winding Hot Spot Monitoring
Transformer Winding Hot Spot Monitoring consists of fiber optic temperature sensors, temperature measurement host (demodulator), dedicated transmission optical cables, local display alarm units (optional), and upper computer monitoring software. It has high reliability, high insulation, and long-term stability, and is widely used in oil immersed power transformers of 110kV and above. It is an important intelligent means to ensure the safe operation of main equipment in the power grid.
Description
Details page content
I. Product Introduction:
Transformer Winding Hot Spot Monitoring is a high-precision online monitoring device for direct, real-time measurement of internal winding hot spot temperatures. The system is based on fluorescence attenuation, FBG, or gallium nitride temperature measurement principles. Passive, insulated fiber optic sensors are embedded in key winding areas to accurately sense temperature via optical signals, completely unaffected by strong electromagnetic fields or oil interference. It truly reflects the hottest point temperature rise, avoiding the lag and errors of traditional top oil temperature methods, and significantly improves early warning for overheating and insulation aging risks. Its main functions include preventing winding thermal damage, supporting dynamic capacity expansion, optimizing condition-based maintenance, and meeting intelligent substation requirements for main equipment state perception.
II. Model Explanation
III.Product Details/Advantages:
- Direct and precise temperature measurement: Sensor directly embedded at winding hot spot, reflecting real temperature with ±0.5°C accuracy – far superior to indirect methods.
- Completely immune to EMI: All-fiber passive sensing technology unaffected by strong electric fields, magnetic fields, or lightning – ideal for high-voltage environments.
- High insulation & intrinsic safety: Metal-free, non-electrified sensor with high withstand voltage, compatible with transformer oil for long-term safe operation.
- Multi-channel real-time monitoring: Supports 8–24+ channels, simultaneously monitoring high/low voltage windings and interlayer hotspots.
- Smart integration & remote management: Supports IEC61850 and Modbus for seamless substation integration, remote data access, over-temperature alarms, and historical trend analysis.
IV. Testing Indicators
|
Product Model: SUN-IGuard-612 |
|
|
Measurement range |
-40～260℃ |
|
Measurement resolution |
0.1℃ |
|
Measurement accuracy |
±2℃ |
|
Temperature acquisition interval |
2s |
|
Number of temperature measurement channels |
1~16 channels |
|
Power supply |
12~24VDC |
|
Power consumption |
5W SUN-OTP series fiber optic temperature probe manufactured by Zhejiang Rsafele Electric Co., Ltd. |
|
Temperature probe |
2-channel 485 |
|
Communication interface |
MODBUS RTU |
|
Communication protocol |
Quality Management System Certification: Complies with GB/T19001-2008/ISO90001:2008 |
|
Product certification |
Electromagnetic Compatibility Certification: Complies with GB/T 17626 |
V. Scope of Supply
The configuration for a single set is as follows:
|
No |
Name |
Model |
Unit |
Quantity |
Remarks |
|
1 |
Transformer Winding Hot Spot Monitoring |
SUN-IGuard-612 |
set |
1 |
Including software |
|
2 |
Pipe-through plate |
piece |
1 |
||
|
3 |
Pipe-through device |
piece |
On demand |
The agreement shall prevail |
|
|
4 |
Internal optical fiber |
root |
On demand |
The agreement shall prevail |
|
|
5 |
Control cable |
m |
On demand |
The confirmed drawings shall prevail |
VI. Optional Customization Solutions
We can provide solutions with a complete back-end analysis system (including an engineering workstation) or only system software configuration, depending on the different needs of our customers. The monitoring device has real-time on-site viewing and alarm functions. If the customer does not require back-end data viewing, an engineering workstation is not required.
VII. Quality
Long-Term Reliability: Offers excellent stability with drift-free performance and minimal maintenance. Safety Standards: Site conforms to GB/T 9361 Class B, equipment conforms to GB 4943. Electromagnetic Compatibility Certification: Complies with GB/T 17626
Qualification association: We adhere strictly to globally recognized regulations and protocols, integrating environmental excellence and quality management throughout the product lifecycle.
VIII. Real-world cooperation cases
Our Transformer Winding Hot Spot Monitoring provides direct and precise measurement of winding hot spot temperature, enabling real-time overload capacity assessment and overheating risk prevention. It delivers real-time temperature alerts and accurately diagnoses winding faults through trend prediction and multi-dimensional data analysis. This system ensures continuous thermal monitoring of the transformer's most critical component, supporting a shift from routine maintenance to condition-based maintenance while enhancing power supply safety and continuity for projects like the Bugumaxi potassium salt mine.
IX. Application Scenarios
- Critical Grid Assets: Protects main transformers in UHV/large substations via real-time hotspot monitoring.
- Heavy-Load Operations: Ensures reliable supply in urban/industrial areas with precise temperature monitoring under load fluctuations.
- Mission-Critical Facilities: Prevents sudden failures via early overheat warnings for data centers, hospitals, and rail transit.
- Intelligent Maintenance: Provides essential data for safety, lifespan assessment, and smart grid management.
X. Our Service
Our after-sales service and technical team solemnly promises
Pre-Sales Service
Consultation & Guidance: 24/7 online support with expert engineers to clarify needs, recommend solutions, and advise on pricing and processes.
On-Site Inspection: Engineers visit sites for precise measurements and environmental assessment, deliver detailed reports to support tailored system design.
After-Sales Service
Year Warranty: Covers material/manufacturing defects as per contract.
Dedicated Support: One-on-one follow-up from a specialized team for seamless assistance.
Multi-Channel Help: Support via contacts, project teams, or website; fast global coordination for repairs or replacements during warranty.
XI. Product usage tutorials, solutions, and technical problem notifications
I. Personnel Qualifications and Basic Fiber Optic Operation Procedures
II. Fiber Optic Laying Path Requirements
III. Excess Fiber Optic Cable Storage and Fixing
IV. Connector Protection
V. Transmitter Disassembly Sequence
[Click here to view the complete product manual & detailed instructions >]
XII. Packaging and Transportation
XIII. Factory Strength
1. Qualification Certificates
2. Innovative technologies/capabilities
3. Supply Chain Advantages
- Strict Supplier Selection – Ensures quality control from raw materials to production.
- Long-Term Partnerships – Enables fast response to customer needs.
- On-Time Delivery Guarantee – Supports reliable product availability.
- Equipment Safety & Maintenance – Safeguards safe operation and intelligent maintenance of customer equipment.
4. Professional production equipment (CNC)
XIV. FAQ
Q1. What is fluorescent fiber optic temperature measurement technology?
A1: It utilizes the precise relationship between the afterglow time of a fluorescent material after light excitation and its temperature for temperature measurement. It boasts strong anti-interference capabilities and good stability.
Q2. How are sensors installed?
A2: Recommended installation: Pre-embedded type: Directly fixed to the coil during winding manufacturing; or guided type: The sensor is inserted into the winding oil passage.
Q3. How many sensors are needed for a transformer?
A3: Depending on the winding structure and hotspot distribution, typically 1-2 sensors are installed at critical locations per phase, resulting in 6-12 sensors per transformer.
Q4. How is the optical fiber led out of the transformer?
A4: It is led out through a dedicated sealed optical fiber sleeve, ensuring the oil tank is completely sealed and leak-free.
Q5. What are the routine maintenance procedures for the system?
A5: Monthly check equipment status and communication; clean the optical fiber connectors annually; ensure the junction box is properly sealed.
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