LumaSMART® Winding Hot Spot Temperature Controller for EHV/UHV/HVDC Transformers and Generation, Transmission and Distribution Transformers and Reactors using our patented Luxtron Fluoroptic fiber optic temperature measurement technology.

LumaSMART<sup>®</sup> Front View
LumaSMART<sup>®</sup> Back View
LumaSMART<sup>®</sup> Bottom View


The most critical parameter to monitor on a transformer is the temperature. Transformer life is directly related to the life of the insulating paper inside. The life of the insulating paper is directly related to temperature it is exposed to. The highest temperature on the windings is the Winding Hot Spot (WHS), where the insulating paper is most likely to break down first. Conventional methods only simulate or calculate this temperature, but not directly measure it.

The only way to know exactly the temperature at the WHS is through the use of fiber optics.  LumaSense Technologies, through their Luxtron brand, is the world leader in fiber optic measurement in transformers and the leading innovator of new robust technology. This innovation continues with the LumaSMART®.

The LumaSMART® is designed to provide real time transformer temperatures that can be used for protection and control at a cost effective price. Transformers are critical assets that often take the brunt of an overload condition and are the most likely to be damaged without proper control and protection. The drift-free, calibration-free nature inherent in our patented Fluoroptic® technology makes the LumaSMART® ideally suited for use in transformers as a reliable and cost-effective means of protection for these valuable assets.


There are several benefits to having direct temperature measurement in transformers, including:

  • Maximize transformer performance and extend transformer life with real time data
  • Modernized controller with full communications capabilities and interactive touch screen display
  • Enables accurate and safe control during overload situations
  • Enables condition based maintenance and inspections
  • Trusted performance, durability and longevity worthy of your investment
  • Design verification of transformers in the factory
  • Allow for dynamic loading conditions
  • Ability to control cooling fans, oil circulation pumps and alarms / protective trips
  • Enable Smart Grid interaction with your transformers


The Best-in-Class Flouroptic®-Based Solution for Winding Hot Spots


Technical Data



Number of Channels

4 to 16 (in increments of 2)

Temperature Range -30 to 230 ºC
Accuracy ±2°C over entire temperature range for life of transformer without calibration

Display Response Time

1 sec

Measurement Resolution 0.1ºC
Precision ±0.5ºC
Light Source Life Span Life of the transformer
EMI/RFI Susceptibility Complete immunity
Display 5.7-inch interactive touch screen
Probe Signal Strength Readout Accessible for all channels
Diagnostics On-board self diagnostics, troubleshooting guide and transformer diagnostics
Environmental Specifications
Operating Temperature -30 to 70°C
Storage Temperature -35 to 75ºC
Analog Output

Choice of 4-20mA or 0-1mA 

Serial Output RS-232C, RS-485, Ethernet, USB 


0, 8 or 16 Form-C programmable relays

System Status Relay

1 Form-C relay

Communications Modbus ASCII, Modbus RTU, DNP3.0, ASCII and IEC61850 Standard


Accepts LUXTRON Dip-Tip Rugged and Quality Probes

Data Storage 2 GB of data at 1 minute intervals on all channels, as well as error codes and relay statuses. Retains approximately 40 years of data.
Input Power 90 to 264 VAC or 127 to 370 VDC, 47 to 63 Hz
Surge Protection 4000V (IEEE C37.90.1-2002)
Consumption 108 W (maximum)
Mounting Rack, panel or wall mount available

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