Advancing VLD Monitoring: PowerEarth Congratulates Undergraduate Engineer Thomas Styles
PowerEarth Technologies is proud to celebrate the achievements of Thomas Styles, an Electrical Engineering & Business Commerce student at the University of Newcastle and an Undergraduate Electrical Engineer within our team.
Thomas has recently completed his Bachelor’s thesis: a PowerEarth-sponsored research project aimed at enhancing Class 1 Voltage Limiting Devices (VLD-MDs) to improve monitoring for VLD-F failure in DC traction systems.
In a DC traction rail corridor, electrically conductive assets located within the Overhead Contact Line Zone (OCLZ) require a Class 2 VLD-F spark gap connection. Preventing electrolysis corrosion caused by current leakage depends on effective monitoring by a Class 1 VLD Monitoring Device (VLD-MD). Thomas’ project set out to design and validate an improved VLD-MD capable of accurately detecting and classifying faults using executable alarms configured by externally settable voltage and timing threshold switches. The design introduces quad-channel monitoring to support a wide variety of VLD-F-connected assets, alongside improved filtering of analog signals, increased usability for technicians, greater input-voltage range, and compliance with IEC 61000.
To bring this to life, Thomas developed a prototype able to monitor system health, refined analog front-end circuitry, redesigned filtering architecture, and ensured the device could withstand 2 kV surge events typical of rail traction environments.
The project combined circuit design, simulation, and hardware testing. Using tools such as PSpice/Cadence OrCAD, Thomas evaluated a new virtual grounding circuit topology and carried out hardware testing to assess fault-classification accuracy, filtering performance, and analog front-end integrity. During development, signal-attenuation issues were resolved through power increases, and initial resistor-only surge protection was replaced with an improved resistor–inductor combination.
Planned next steps include integrating the system into a full SCADA interface for real-time traction-network monitoring, optimising PCB design, and improving cost-to-performance for potential commercial deployment.
The engineering depth behind this work is significant, and it has been rewarding to see the project progress from initial concept to a practical, functional prototype. These outcomes directly support advancements in the monitoring of VLD behaviour in DC traction systems—an area closely aligned with PowerEarth’s commitment to reliable protection, system performance, and long-term asset longevity.
PowerEarth congratulates Thomas on this achievement, and we look forward to supporting his continued development both within the company and across the broader industry.
