Partial Discharge (PD) monitoring system

A partial discharge monitoring system for high voltage and medium voltage assets.


Detect and monitor partial discharge using fiberoptics

OptiFender is an innovative fiber optic sensing solution which enables partial discharge monitoring of high voltage assets in challenging environments.
Thanks to its unique fiberoptic technology and passive sensing principle, the OptiFender system delivers a set of benefits for your most challenging installations:

Immune to electro magnetic interference
Monitoring of remote assets (> 20km)
Galvanically isolated sensors for easy installation
Completely passive – no power at sensing location required
Critical monitoring for HV & MV assets

OptiFender allows you to localize PD source in an asset remotely and in real time

HV Cable Accessories

Each joint location is monitored with a pre-assembled sensor set

Switch gear

Detect partial discharge in switch gear


Diagnose and monitor transformers to identify and localize PD source

HV Cable Accessories

Detect partial discharge in electrical machines in real time

What is OptiFender

OptiFender: The World's First Fiber Optic Discharge Monitor.

OptiFender is the world’s first fiber optic partial discharge monitoring system.

Its unique patented technology delivers a high reliable fiber optic solution, while keeping the same performance as state-of-the-art electrical systems.

OptiFender includes:

  • Modular acquisition unit
  • Fiber optic PD sensors
  • Magnetic clamp
  • Dedicated software package
How does it work

Passive Fiber Optic PD Sensor for Accurate Monitoring

OptiFender measures the acoustic emission signals of partial discharges and tracks their evolution over time with fiber optic PD sensors. The measuring principle behind the fiber optic PD sensor is based on the acoustic emission technology.
The small and completely passive sensors can be easily installed on any kind of asset, enabling the detection of close-by internal and surface partial discharges.
The acoustic emission signals acquired by the sensor is transmitted to the acquisition unit through a standard telecommunication optical fiber. The acquired data is then displayed and analyzed through the dedicated software.

How does it compare to an electric system

Measuring internal Partial Discharge (PD) down to 10 pC

Our revolutionising technology allows us to detect even the slightest indications of PD. Our success is not only demonstrated through the work we do with our clients but through our peer-reviewed research as well.

What OptiFender offers

EMI immunity

  • Completely passive transducer
  • Crystal clear signal in any environment
  • Consistent measurements and reliable data

Remote locations

  • Acquisition unit and sensors can be spaced tens of kilometres apart
  • Monitoring of remote HV assets
  • Simple cabling to cover long distances

Easy installation

  • Uninterrupted equipment operations during installation
  • Safe, galvanically-isolated sensor
  • No technically complex training needed
  • Small and lightweight sensor

No power required

  • No pre-amplifiers needed
  • Fiber optic sensors do not require any electrical power


OptiFender data acquisition unit

The data acquisition unit is a modular readout that transmits and receives the optical signal from the sensor.

OptiFender data acquisition unit

The data acquisition unit is a modular readout that transmits and receives the optical signal from the sensor.

OptiFender data acquisition unit

The data acquisition unit is a modular readout that transmits and receives the optical signal from the sensor.

“OptiFender allowed us to solve the main limitations and now we are able to benefit from long-distance coverage and EMI immunity. After trying out of the first OptiFender system, we were happy about the results and proceeded to use OptiFender for a number of current projects,”

Sales Manager, Sedatec

Enhance Your Power System Reliability with

Fiber Optic Partial Discharge Monitoring System

Our system provides accurate and reliable data on your power system’s performance. Monitor partial discharges in real-time to detect potential problems early and prevent costly downtime. Download our brochure now.

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