Respond to faults with minimum cost and maximum efficiency.

Extremely precise fault location on overhead power lines can significantly reduce costs for utilities. It enables operation and maintenance engineers to respond more rapidly to events, get to the site of faults faster and correct defects.

With Traveling Wave (TWS) Fault Location techniques, operators can pinpoint faults to within one tower accuracy - something far beyond traditional impedance methods.

fast accurate transmission fault location


Get Results in Minutes

automatic calculate dispatch transmission faults

Accurate results from circuit trips are automatically calculated and displayed in the dispatch centre within minutes of the event occurring.

Alert Crews Automatically

automatic team messaging faults maintenance

Fast, automatic dissemination of results gets the information directly to maintenance teams without the need for a protection engineer.


Capture All Faults

high resistance impedance fault location

Returns quality results for all types of faults, including high resistance ground faults and open circuit. Accuracy is independent of line length, remote end infeed, non-uniform line construction, conductor asymmetry and mutual coupling.

Reduced System Risks

fast network system restoration

Faster restoration time reduces system risk posed by the possibility of a second or third coincident fault, and reduces uneconomic generation costs needed to maintain system security during the line outage.

Traditional impedance fault location lacks the accuracy and consistency you get from TWS. Error margins can be upwards of 25%, leaving a big search area for maintenance teams.
— Qualitrol

rectify intermittent overhead power line faults

Rectify Intermittent Faults

TWS lets you track intermittent self-clearing faults and focus maintenance at the right spot to prevent a major breakdown.

Most overhead line faults are transient and can be successfully re-closed. However, multiple trips can occur at the same place over time, due to a damaged insulator, growth of vegetation or conductor clashing.

Accurate fault location methods can pinpoint these trouble spots, allowing planned maintenance to be undertaken to rectify the ‘minor’ transient problem before it becomes a major or permanent one. Fewer line trips also reduces the number of voltage dips and subsequent customer complaints.




Qualitrol TWS-FL goes head-to-head with 3 other Traveling Wave Systems.

An Asian transmission utility invited four companies, including Qualitrol, to demonstrate the capabilities of their TWS Traveling Wave fault location systems. Each company had two days to install their equipment and on the third day the faults were induced.

Five tests were carried out over three days with one clear winner at the end.

qualitrol tws fault location case study

Learn more about TWS Fault Location

Browse our technical papers on traveling wave application to find out more about this valuable application, including:

  • how it compares to impedance methods
  • how it has been used in sub-transmission applications, as well as in underground cable.
  • how it is benefiting utilities far beyond its core application


The Qualitrol TWS Family

Choose from monitoring a single line or up to 8 lines in a single device.


We're with you for all your Monitoring needs.


Specification Development

We work closely with end user teams to understand their challenges, information needs and existing architecture, so to help guide future specifications and investment decisions.


System Configuration

Our team can support system setup, from integration with existing architecture, through to triggering, automated actions and report writing.

Expert Advice

With hundreds of installations across Australia, our network monitoring team has plenty of experience in the capture and utilisation of important fault and disturbance data.


Fleet Maintenance

We offer a range of services to support the lifetime operation of monitoring hardware and can customise this to suit individual networks.


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Find out more today.

Whether you're operating a Transmission or Distribution network, a Generation plant, or Industrial site, we would be glad to have a no obligations discussion to understand how we can help your organisation.