Transformer Temperature Monitoring Solutions
A complete transformer temperature monitor and monitoring system lineup covering fiber optic hot spot sensing, WTI, OTI, and dry type transformer temperature monitoring — matched to your transformer type and criticality.
- Fiber optic hot spot sensing for critical and high-voltage transformers
- WTI and OTI temperature indication for oil-immersed transformers
- Dry type transformer temperature monitoring with alarm and fan control
Complete Temperature Monitoring Coverage
Fiber optic, WTI, OTI, and dry-type transformer temperature monitors
Transformer Temperature Measurement for Power Equipment
Accurate transformer temperature measurement is essential for protecting insulation and preventing unplanned outages. A transformer temperature sensor tracks how heat builds up inside the unit, since rising temperature directly accelerates insulation aging and shortens equipment life. The winding hot-spot is typically the first point where thermal stress appears, making it the most critical location for transformer temperature monitoring.
- Sustained overheating accelerates insulation aging and reduces service life
- Winding hot-spot temperature is often the earliest indicator of thermal stress
- Different transformer designs require different measurement approaches
- Continuous measurement supports early detection before damage occurs
Transformer Temperature Sensing Technologies
Four core temperature sensing technologies, each suited to different transformer types and criticality levels.
Fiber Optic Temperature Sensing for Transformer Hot Spots
A fiber optic temperature sensor measures winding hot-spot temperature directly at the source, offering complete immunity to electromagnetic interference for high-voltage and mission-critical transformers.
Transformer Winding Temperature Indicator (WTI)
A transformer winding temperature indicator simulates winding temperature rise based on load current and top-oil temperature, providing traditional and widely used transformer winding temperature monitoring.
Transformer Oil Temperature Indicator (OTI)
An oil temperature indicator in transformer applications directly measures top-oil temperature, providing simple and reliable local indication with alarm functions.
Transformer Temperature Monitors and Controllers
Browse our transformer temperature monitor and controller product lines.
WTI, OTI and Fiber Optic Temperature Monitoring Comparison
A quick reference to help select the right temperature monitoring method for your transformer.
| Monitoring Method | Типичная область применения | Объект измерения | Advantages |
|---|---|---|---|
| Мониторинг температуры с помощью оптоволоконных датчиков | Трансформаторы критической мощности | Direct winding hot spot temperature | EMI immune and high accuracy |
| WTI | Oil immersed transformers | Simulated winding temperature | Traditional and widely used |
| OTI | Oil immersed transformers | Top oil temperature | Simple and reliable |
| Dry Type Transformer Temperature Monitor | Dry type transformers | Температура намотки | Alarm and cooling fan control |
Transformer Hot Spot Temperature Detection
The winding hot spot is typically the location of highest thermal stress inside a transformer. Left undetected, an overload condition can push hot-spot temperature well beyond safe limits, accelerating insulation aging long before top-oil temperature shows any abnormal reading.
- Hot-spot temperature rises faster than top-oil temperature under load
- Undetected thermal stress leads to progressive insulation aging
- Overload conditions are a common trigger for hot-spot temperature rise
Frequently Asked Questions About Transformer Temperature Monitoring
What is a transformer temperature monitor?
A transformer temperature monitor is a device that continuously measures winding, oil, or ambient temperature and provides local display, alarm output, or remote signal transmission to detect overheating before it damages the transformer.
How does a winding temperature indicator work?
A winding temperature indicator uses a heating element powered by current transformer input, combined with a thermometer bulb in the top oil, to simulate the temperature rise of the winding above the surrounding oil temperature.
What is the difference between WTI and OTI?
A Winding Temperature Indicator (WTI) simulates winding temperature based on load current and top-oil temperature, while an Oil Temperature Indicator (OTI) directly measures the top-oil temperature of the transformer tank.
Why are fiber optic temperature sensors used for transformers?
Fiber optic temperature sensors provide direct hot-spot measurement inside energized windings with complete immunity to electromagnetic interference, making them suitable for high-voltage and mission-critical transformers.
How are dry type transformers monitored for temperature?
Dry type transformers are typically monitored using PT100 sensors embedded in the windings, connected to a temperature monitor and controller that provides display, alarm output, and cooling fan control.
How to choose a transformer temperature measurement system?
The choice depends on transformer type and criticality: fiber optic sensing suits critical power transformers, WTI and OTI suit oil-immersed transformers, and dedicated temperature monitors suit dry-type transformers.
Need the Right Temperature Monitoring Solution?
Customized solutions are available for transformer temperature measurement, WTI, OTI, fiber optic sensing and dry transformer monitoring.
