In October 2024 we reached the milestone of
10 years in business !
High Frequency Diagnostics & Engineering (HFDE) Ltd provides testing and consulting services for all aspects of Partial Discharge (PD):
High Frequency Diagnostics & Engineering (HFDE) Ltd provides testing and consulting services for all aspects of Partial Discharge (PD):
- PD surveys of MV / HV / EHV plant, substations, wind farms, etc.
- Permanent or short-term PD monitoring of power transformers, GIS, cables, switchgear
- Insulation diagnostics, consultancy, risk assessment
- Design and implementation of high voltage PD test facilities
- PD testing of small / medium sized components
- Customised training courses (PD awareness, detection principles, diagnosis, best practice)
- Design, prototyping and optimisation of PD sensors
- Calibration services for UHF PD sensors
Please see our Services Leaflet.
On-site PD Investigations:

HFDE's R&D Lab / Workshop:

Our UHF PD Sensor Development and Test Facility:

Specialist Monitoring and PD Location Services:

HFDE’s founder, Dr Martin Judd, is a Chartered Electrical & Electronic Engineer with 40 years’ experience. Previously, he was Professor of High Voltage Technologies at the University of Strathclyde in Glasgow, where he carried out pioneering R&D on PD for 20 years and served as manager of the HV Laboratory.