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Fibre Optic Temperature Monitoring

Complete End‑to‑End System
Optional Environmental Control

Accurate, Direct Winding Hot‑Spot Measurement

Fibre optic temperature monitoring provides real‑time, direct measurement of transformer winding hot‑spots, offering a reliable way to understand true internal temperatures under all loading and operating conditions. Unlike calculated or indirect methods, fibre optic sensors installed directly within transformer windings give an accurate picture of actual thermal behaviour, helping prevent premature insulation ageing, overheating and unplanned failures.

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Made for Demanding Environments

Fibre optic temperature systems are widely used in power transformers, distribution transformers and load tap changers, supporting both new builds and retrofits. These systems are especially valuable in environments with dynamic loading, high thermal stress or accelerated ageing risks. The technology is also used in transformer design validation, factory acceptance testing and quality control labs. With multi‑channel capability, rugged probes and flexible feedthrough options, Neoptix solutions support monitoring for dry‑type and oil‑filled transformers across transmission and distribution applications.

What We Solve For

Traditional thermal models and indirect temperature estimates cannot always capture real winding behaviour under variable load or abnormal conditions. Fibre optic sensors measure the actual hot‑spot temperature, giving more reliable data to prevent failures, adjust dynamic loading, extend insulation life, and support condition‑based transformer operation. By understanding true thermal limits, asset owners can safely optimize loading, reduce overheating events, and improve long‑term transformer reliability.
TECHNICAL

Features & Functionality

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Accurate Hot‑Spot Measurement

Fibre optic probes installed directly in the windings provide true hot‑spot temperatures—not calculated or inferred measurements—helping predict dynamic loading capability, avoid thermal damage and support safe operational decisions.

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Transformer‑Ready
Probe Design

Neoptix T2™ probes are oil‑immersed, reinforced, and built to withstand harsh transformer environments. They use oil‑permeable PTFE jackets, dielectric connectors and reinforced spiral wrap to meet ASTM performance requirements.

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Multi‑Channel Monitoring

Systems support anywhere from 1 to more than 100 channels depending on model, enabling comprehensive multi‑point temperature profiling for large power transformers and detailed thermal mapping for research, testing and industrial applications.

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Robust Communications

Signal conditioners and monitors support Modbus, ASCII, IEC‑61850, and other protocols, with options for analog outputs, web server interfaces, data logging and Smart Grid connectivity—making integration with transformer monitoring systems seamless. 

Functionality & Options

  • Direct winding hot‑spot measurement for accurate real‑time thermal data.

  • Probe options including T2™ oil‑immersed probes, Tx panel feedthrough probes, and portable measurement tools.

  • Multi‑channel capability, from 1 to 104+ channels depending on model (T/Guard, OmniFlex‑2, 509DW/509‑XT, 408XT).

  • Data logging (up to 7 GB in some models) for long‑term trending and analysis.

  • Various enclosures and feedthroughs including NEMA 4–12/IP66 protective housings, tank wall plates and optical junction boxes.

  • Optional environmental control, cooling control, LTC monitoring and analog/digital output modules.

  • Software compatibility with OptiLink™ & OptiLink‑II™ for configuration, control and data logging.

Key Technical Specifications

  • Oil‑immersed T2™ probes with PTFE/Teflon™ jackets and Kevlar™ reinforcement.

  • Available lengths: 1 to 25 meters.

  • Surpass ASTM D149 and D2413 dielectric strength requirements.

  • Tank wall feedthroughs using solder‑glass bonding technology (no epoxy/O‑ring) for permanent oil‑tight sealing.

  • JBox2™ protective enclosure supports up to 24 feedthroughs.

  • System options range from 1 to 104 channels.

  • Hot‑swappable modules; fast or sequential sampling options (10 Hz to 250 ms/channel).

  • 4–20 mA analog outputs and RS‑485 digital communication.

  • Communication & Protocols:  Modbus, ASCII, IEC‑61850, 100BASE‑FX fiber options, and integrated web servers depending on model.

  • Enclosure Options: NEMA 4–12 / IP66‑rated enclosures for field installation. 

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Neoptix Product Overview

Datasheet
EXPERIENCE

Our Projects featuring Insulect Transformers

Explore our project highlights to see where Insulect Transformers are making an impact.
For tailored advice on whether this solution suits your network, please connect with our team here.

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Where you'll find our Transformers

You'll find Insulect-supplied and installed Transformers across Australia and New Zealand -- our locally built Insulect range and imported Sieyuan range.

ADVANTAGES

Why Choose Insulect for
Fibre Optic Temperature Monitoring

Our fibre optic probes provide real hot‑spot data, helping reduce thermal risk and improve confidence in loading and operational decisions. This makes them a reliable choice for long‑term transformer performance in demanding environments.
 
Proven, Field‑Tested Technology
Our fibre optic systems are used globally in utility, industrial and OEM environments. They have been field‑proven across design validation, manufacturing, and long‑term transformer operation, ensuring dependable temperature measurement throughout the transformer’s life.
Complete End‑to‑End System
From probes, extension cables and feedthroughs to signal conditioners and multi‑channel controllers, Neoptix offers a fully integrated ecosystem designed specifically for transformer environments. Everything is built for reliability, installation efficiency and long‑term performance. 
Support, Calibration & Service
We provides on‑site commissioning, maintenance services and NIST‑traceable calibration certificates, along with extended warranty options—ensuring long‑term system accuracy and dependable lifecycle support.
IMPLEMENTATION

Services & Support

Insulect offers comprehensive services and support for the products we manufacture and specialise in, enhancing value for local utilities, major energy users, equipment manufacturers, and service operators. 

LOCAL TECHNICAL TEAM

Our local technical team provides exceptional support and expertise, ensuring quick response times and personalised service to tackle any challenges that may arise during project execution.

  
ENGINEERING DESIGN

Our team utilises advanced technology and industry knowledge to develop innovative and efficient high-voltage switchgear solutions, customised to fit the unique requirements of each project.


  
PROCUREMENT & LOGISTICS

We facilitate smooth procurement and logistics processes by sourcing from trusted, proven partners and coordinating timely deliveries, ensuring projects remain on schedule and within budget.


  
TESTING & COMMISSIONING
Professional testing and commissioning support ensure that every high-voltage switchgear system functions safely and reliably, adhering to all regulatory standards and client expectations.
  
TURNKEY PROJECT DELIVERY

We are able to oversee every phase from concept to completion, providing comprehensive solutions that simplify complex projects and ensure successful outcomes.

  
FACTORY VISITS
We facilitate client visits to our local manufacturing sites here in Australia, as well as overseas, for initial inspection as well as factory acceptance testing.
  
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