We trial new LV fault locator

We are trialling a new low voltage (LV) phase to phase fault locator, developed by Northampton engineers Gary Butler and Tom White. This tool aims to improve the efficiency of locating phase-to-phase faults on the network.

Historically, locating a phase-to-phase fault has been a time-consuming process. Crews often have to excavate multiple times and cut cables in an attempt to find the fault. This can lead to prolonged outages for customers and increased costs due to the need for multiple excavations.

Our LV phase to phase fault locator simplifies this process. By connecting the device at the substation, teams can accurately identify the location of faults without extensive digging. NGED Engineering Specialist Gary Butler discovered that by calculating the impedance up a cable to the fault while applying load to the network—such as turning on kettles—he could improve fault location accuracy.

This technology allows engineers to quickly determine the exact spot of a fault, enabling them to make repairs more efficiently. As a result, customers will experience less disruption and a more effective use of resources.

Technician Tom White then developed the first prototype as part of his Higher National Certificate project, successfully bringing the idea to life.

With fewer outages and quicker restoration times, customers can enjoy a more stable and dependable service. However, the benefits of this technology extend beyond improved fault detection.

By reducing the time and effort required to locate faults, we anticipates significant cost savings, potentially between £0.7 million and £2.3 million annually. These savings can be reinvested into enhancing services and infrastructure, ultimately benefiting customers.

To ensure the effectiveness of this new technology, we will conduct a six-month trial across six depots in Leicester, Kettering, Coventry, Stoke, Nottingham, Tipton, and Cardiff. Teams are currently undergoing training to understand how to use the new technology effectively.

The trial will focus on key areas such as accuracy, ease of use, reliability, and the cost of faults.

Gary Butler commented: "This new fault locator could represent a significant advancement in our ability to respond to faults efficiently. By reducing the time it takes to locate faults, we can minimise disruption for our customers and enhance the overall reliability of our service."

Tom White added: "This tool has the potential to not only helps us work more effectively, but to provide a better experience for our customers. It’s been great to be able to build a prototype and share it with the business, and it’s really pleasing to see it being trialled in some of the communities that we serve."

Following the six-month trial, we will review the results and feedback before deciding on a wider rollout.