Since The first PD detector in the 60’s, Haefely-Tettex combined the best of both worlds in the release of the DDXTM 9121b Partial Discharge Detector, powerful yet easy to use. Our partial discharge product offering includes all one needs for factory testing. When it comes to partial discharge testing, you can’t beat the Haefely instruments team.

Advantages
• Reduced ground noise – The built-in frequency spectrum analysis and selectable frequency band let the user optimize the setup quick and easy.
• Optimized investment – Unit can be easily upgraded (RIV, 4 inputs switch, simultaneous PD readings, PD on DC, etc.).
• PD interpretation – The phase resolved analysis and recording capabilities allow future data analysis.
• Reduced training time – The Windows based software makes the use of the device easier than ever. Operators can start using the device in minutes.
• Fast PD site location (SL) in power cables – SL function enables users to locate the site of failure in power cables in seconds.
• Applications versatility – DDX 9121b enables user to measure PD under AC or DC voltage stress, provides simultaneous RIV (NEMA & CISPR) and PD measurement as an option and can perform fast PD Site Location on cables.

Applications
• Power and distribution transformers
• Instrument transformers
• Rotating machines
• Switchgears (MV/HV/GIS)
• Surge arresters
• Bushings
• Cables
• Power capacitors
• Components testing
• Research and development