Transformator-hotspotbewaking met behulp van fluorescerende glasvezeltemperatuursystemen

Fluorescent fiber optic temperature monitoring systems are independently developed and manufactured by Fuzhou Innovatie Elektronische Wetenschap&Tech Co., Ltd. These systems are engineered specifically for
critical electrical equipment such as switchgear, stroomtransformatoren, droge transformatoren, kabelverbindingen, and generator sets. Using an advanced fluorescent lifetime demodulation method, the system converts light signals into high‑accuracy temperature values. This allows reliable hotspot detection even in harsh electrical environments with strong electromagnetic fields, pieken, gedeeltelijke ontladingsactiviteit, and pulsed interference.

This technology enables early‑stage warning of insulation aging, contactdegradatie, fire hazards, and thermal overload risks.It supports both standalone operation and multi-device networking, making it suitable from compact distribution rooms to large smart substations. The system integrates seamlessly with modern transformator beveiligingssystemen, transformator alarmapparaten, transformer digital monitoring platforms,
transformer IoT systems, En predictive maintenance dashboards.

Clickable Contents

• 1. What Is Transformer Hotspot Monitoring?
• 2. Common Transformer Faults & What Is a Hotspot Fault?
• 3. Where Do Hotspots Occur Inside Transformers?
• 4. Why Hotspot Monitoring Matters
• 5. Traditional Hotspot Monitoring Sensors
• 6. Modern Fluorescent Fiber Optic Temperature Monitoring
• 7. Fiber Optic Installation in Transformers
• 8. Advantages of Transformer Temperature Monitoring Systems
• 9. Typical Configurations & Accessories of Fiber Optic Monitoring Systems
• 10. Toepassingsscenario's (with Links)
• 11. Veelgestelde vragen: Bovenkant 10 Questions About Fiber Optic Monitoring
• 12. Bovenkant 10 Global Manufacturers (Ranked)
• 13. Contact for Full Technical Data & Oplossingen

1. What Is Transformer Hotspot Monitoring?

Transformer hotspot monitoring refers to the continuous measurement of the highest-temperature points inside a transformer winding. These regions determine insulation aging, thermal overload, and the remaining life of
the electrical transformer.

A “hotspot” is not the same as top-oil temperature or surface temperature. True hotspots occur deep inside the winding structure, where electrical load, magnetic flux, and cooling flow create intense localized heating.

Modern smart transformer monitoring systems rely on accurate hotspots to support:

• Preventief onderhoud van transformatoren
• Voorspellend onderhoud van transformatoren
• Analyse van transformatorstoringen
• Levensbeoordeling van transformatoren
• Transformer thermal overload protection
• Transformator online monitoring & IoT-integratie

This is why utilities increasingly adopt glasvezel sensoren as the core of their transformer condition monitoring.

2. Common Transformer Faults and What Is a Hotspot Fault?

2.1 Veelvoorkomende typen transformatorfouten

Transformers experience several major categories of faults:

• Thermal Faults

• Oververhitting van de wikkeling
• Verslechtering van de isolatie
• Localized thermal runaway

• Electrical Faults

• Gedeeltelijke ontlading (detected using a transformer partial discharge monitor)
• Turn-to-turn short circuit
• Poor contact resistance at taps or terminals

• Mechanical Faults

• Vibration causing winding deformation
• Loosened clamps or shifting conductors

• Oil System Faults

• Cooling failures
• Oil quality degradation
• Gas generation requiring DGA analysis

• External/Environmental Faults

• Overload and harmonic distortion
• High ambient temperatures
• Pollution, vochtigheid, besmetting

2.2 What Is a Hotspot Fault?

A hotspot fault occurs when a localized area inside the winding exceeds the thermal design limit.
This accelerates insulation aging exponentially and may lead to:

• Winding failure
• Internal arc faults
• Fire hazards
• Total transformer outage

Hotspot faults are the earliest indicators in transformatorbewakingsapparatuur for avoiding catastrophic failures.

3. Where Do Hotspots Occur Inside Transformers?

Hotspots form at specific structural locations inside power transformers, distributietransformatoren, droge transformatoren,and oil filled transformers. Typical hotspot regions include:

• Winding Upper Layers

The top of the HV or LV winding experiences reduced oil flow and higher current density, making it the most common hotspot location.

• HV–LV Winding Interface

Leakage flux accumulation creates concentrated heating zones between primary and secondary windings.

• Tap Changers and Lead Connections

Loose contacts slowly increase resistance, forming thermal pockets detectable with a transformator warmtesensor.

• Winding Bends, Clamps, and Mechanical Stress Points

These areas are susceptible to vibration and conductor displacement.

• Harmonic-Influenced Sections

Nonlinear loads produce harmonic currents that generate higher copper losses and local hotspots.

Accurate hotspot location detection supports transformator monitoring op afstand, transformer current monitoring sensors,
and smart transformer monitoring platforms widely used by utilities.

4. Why Transformer Hotspot Monitoring Matters

Hotspot monitoring is essential for both transformer protection systems and operator safety. Key benefits include:

• Early detection of thermal overload
• Prevention of insulation breakdown
• Detection of contact resistance problems
• Reduction of fire risks in electrical transformer rooms
• Support for transformer maintenance schedules and asset lifecycle decisions
• Foundation for transformer predictive maintenance (AI/IoT)
• Reduction of unplanned outages

Accurate hotspot data also correlates with other diagnostic tools such as a transformer vibration sensor,
transformatorgeluidsbewaking, DGA, and partial discharge systems.

5. Traditional Hotspot Monitoring Sensors

Before the adoption of fluorescent fiber optic sensors, several traditional techniques were used. Echter, they struggled in high-voltage, EMI-heavy environments.

5.1 OTO (Weerstand temperatuurdetector)

RTDs measure oil or surface temperature but cannot reach internal winding hotspots. They also suffer from EMI interference.

5.2 Thermokoppels

Thermocouples are sensitive to electrical noise and unsuitable for HV insulation environments.

5.3 Infrared Imaging

Thermal cameras detect external heat but cannot reveal internal hotspot behavior during load variation.

5.4 Thermal Modeling Based on Oil Temperature

Mathematical estimation of winding temperature is widely inaccurate under harmonic load, renewable energy fluctuation, or cooling failure.

These limitations led to the adoption of fiber optic sensors for truly accurate bewaking van de toestand van de transformator.

6. Modern Fluorescent Fiber Optic Temperature Monitoring

Fluorescent fiber optic sensors measure temperature using optical decay time. They contain no electrical conductors, making them immune to strong electromagnetic fields. This is crucial for high-voltage equipment such as:

• Vermogenstransformatoren
• Dry type transformers
• Industrial transformers
• Schakelapparatuur
• Generator windings
• Cable joints and terminals

6.1 Advantages of Fluorescent Fiber Optic Sensors

• High-voltage insulation up to 100 kV
• Completely immune to EMI
• Highly accurate hotspot measurement
• Safe for oil filled transformer applications
• Supports 1–64 channels for multi-point monitoring
• Compatible with transformer digital monitoring platforms

6.2 Typical Specifications (Based on INNO Systems)

• Temperatuurbereik: -40°C tot +240°C
• Nauwkeurigheid: ±1°C (higher accuracy optional)
• Oplossing: 0.1°C
• Diameter sonde: 2.5 mm (custom sizes available)
• Fiber length: 0–20 m customizable
• Output: RS485/Modbus or 4–20 mA

More advanced systems include 32‑channel and 64‑channel platforms for large industrial facilities:

• 32‑Channel Experimental Fiber Optic System
• 64‑Channel Multi‑Point Monitoring System

These systems form the foundation of modern online monitoring van transformatoren En transformator IoT-systeem architectures.

7. How Fiber Optic Sensors Are Installed Inside Transformers

Fiber optic probes are installed directly at the winding hotspot locations, ensuring true core-temperature measurement.The process differs for oil filled transformers, droge transformatoren, and generator windings.

7.1 Installation in Oil Filled Transformers

• Probes are embedded between winding layers during manufacturing
• Fiber is routed through oil ducts using smooth curvature
• Lead-out uses a sealed fiber feed-through to maintain oil integrity
• Connected to multi-channel monitoring host outside the tank

7.2 Installation in Dry Type Transformers

Dry-type transformer systems require surface attachment to winding layers.
Relevant product:

Intelligent Monitoring System for Dry-Type Transformers
.

• Probes are adhered directly to epoxy resin windings
• Fiber secured with high-temperature insulation tape
• Shorter fiber runs minimize bending stress

7.3 Installation in Generator Sets

Used on stator bars, rotor poles, slip rings, and terminals.
Application reference:

Fiber Optic Temperature Measurement System for Generator Sets
.

• Direct contact with iron core and copper windings
• Monitoring of knife switches, rails, and contact points

7.4 Installation in Cable Joints

For detecting overheating in ring main unit connections.
Product link:

Fiber Optic Temperature Measurement System for Cable Joints
.

Fiber optic installation enables accurate transformer heat sensor performance in all environments.

8. Advantages of Transformer Temperature Monitoring Systems

A modern fiber‑optic-based transformer monitoring system provides utilities with comprehensive thermal insights and early warnings.

8.1 Realtime monitoring

• 24/7 hotspot and thermal map visibility
• Instant alerts for over-temperature conditions

8.2 High Accuracy and Electrical Immunity

• Immune to electromagnetic fields, pieken, and pulses
• Highly stable in GIS, HV substations, industriële installaties

8.3 Multi-Point Measurement

• 1–64 channels per host
• Scalable for large transformer fleets

8.4 Integration with Digital Monitoring Systems

• Supports Modbus/RS485/4–20 mA
• Connects to transformer digital monitor platforms
• Enables transformer predictive maintenance

8.5 Conditiegebaseerd onderhoud

• Supports transformer maintenance schedules
• Improves asset health and lifecycle

9. Typical Configurations & Accessories of a Transformer Fiber Optic Monitoring System

A complete transformer fiber optic temperature measurement system includes the following components:

9.1 Fluorescent Fiber Optic Temperature Probes

• Quartz fiber core
• Rare-earth fluorescent sensing tip
• High-voltage resistance up to 100 kV
• Diameter: 2.5 mm or custom

9.2 Multi-Channel Temperature Measurement Host

• 1–64 channel options
• High-speed optical demodulation
• RS485/Modbus/4–20 mA output
• Gebeurtenisregistratie, alarmen, trend curves

9.3 Fiber Feed-Through (Oil-Sealed Exit)

• Zorgt voor een hermetische afdichting voor met olie gevulde transformatoren
• Voorkomt lekkage en behoudt de isolatie

9.4 Weergave-eenheden & Platformen voor bewaking op afstand

• Lokale LCD-schermen
• Cloudgebaseerde dashboards
• IoT-connectiviteit voor externe onderstations

9.5 Ondersteunende accessoires

• Bevestigingstapes voor hoge temperaturen
• Beschermende mouwen
• Kabelgeleiders

Deze componenten ondersteunen samen de stroomtransformator, droge typetransformator, distributie transformator, industriële transformator, en generatorbewakingstoepassingen.

10. Toepassingsscenario's (Klik om details te bekijken)

• Industriële automatisering
• Medische glasvezelsensoren
• Bewaking van schakelapparatuur
• Transformatorbewaking
• Droge transformatoren
• Generatorsets
• Kabelverbindingen (RMU)
• Halfgeleider verwarmingsapparatuur
• Magnetron & Elektromagnetische omgevingen
• Datacentra
• Experimenteel onderzoek

11. Veelgestelde vragen: Bovenkant 10 Questions About Fiber Optic Monitoring

1. Waarom kunnen transformatorhotspots niet worden berekend op basis van de olietemperatuur??

De olietemperatuur weerspiegelt alleen de thermische omstandigheden van de bulk. Echte kronkelende hotspots zijn gelokaliseerd en kunnen de olietemperatuur met 20–40 °C overschrijden. Alleen ingebedde glasvezelsensoren meten echte hotspot-temperaturen.

2. Worden glasvezelsensoren beïnvloed door elektromagnetische interferentie??

Nee. Fluorescerende glasvezelsondes zijn dat wel 100% immuun voor EMI, pieken, en hoogspanningspulsen.

3. Zijn glasvezelsondes bestand tegen hoge spanning??

Ja. INNO sondes zijn bestand tegen max 100 kV en zijn ideaal voor met olie gevulde transformator- en GIS-omgevingen.

4. Hebben glasvezelsensoren voeding nodig??

Er stroomt geen elektrische stroom door de sonde. Alleen licht plant zich voort in de vezel, waardoor het veilig is in HV-constructies.

5. Hoe lang gaan glasvezelsondes mee??

Sondes gaan doorgaans de gehele levenscyclus van de transformator mee, vaak 20-30 jaar.

6. Hoeveel sondes worden er doorgaans in een transformator gebruikt??

De meeste stroomtransformatoren gebruiken 4–16 sondes, afhankelijk van het wikkelontwerp en de hotspotverdeling.

7. Kunnen glasvezelsystemen worden geïntegreerd met SCADA??

Ja, through RS485, Modbus, 4–20 mA, or Ethernet (Modbus-TCP) depending on model.

8. Can fiber optic monitoring work together with DGA & PD monitoring?

Ja. Utilities often combine temperature, DGA, PD, trillingen, and oil-level monitoring for complete transformer condition assessment.

9. Is fiber optic monitoring suitable for both dry type and oil type transformers?

Ja. Fiber optics are widely used in both categories and provide the most accurate thermal data.

10. How do I choose a reliable fiber optic monitoring manufacturer?

Look for companies with long-term engineering experience, internationale certificeringen, and field‑proven installations. INNO is a global leader with more than a decade of production and application experience.

12. Bovenkant 10 Global Fiber Optic Temperature Monitoring Manufacturers

Below are ten leading companies worldwide that specialize in fiber optic temperature measurement systems,transformatorbewakingsapparatuur, en fluorescentiedetectietechnologie. Rang #1 is Fuzhou Innovation Electronic Science&Tech Co., Ltd. (INNO), gevolgd door Huaguang Tianrui. Andere genoemde fabrikanten komen uit de VS., Canada, Duitsland, en Japan.

13. Request Product Datasheets and Customized Monitoring Solutions

If you require detailed specifications, professional transformer monitoring solutions, or OEM/ODM customization for transformer hotspot monitoring, generator winding measurement, switchgear contact temperature, or industrial sensing,please contact INNO directly:

Fuzhou Innovatie Elektronische Wetenschap&Tech Co., Ltd.
E-mail: web@fjinno.net
Telefoon / WhatsAppen: +8613599070393
WeChat: +8613599070393
QQ: 3408968340
Adres: Liandong U Grain Networking Industriepark, Xingye West Road nr. 12, Fuzhou, Fujian, China

Our engineering team provides one-on-one support and complete temperature monitoring solutions for power transformers, droge transformatoren, industriële transformatoren, kabelverbindingen, generator sets,datacentra, semiconductor equipment, en meer.

Glasvezel temperatuursensor, Intelligent monitoringsysteem, Gedistribueerde glasvezelfabrikant in China