Partial Discharge Testing
Partial Discharges (PD) are evidences of a degrading insulation capacity, which will lead to cost-intensive repairs and can predictively lead to an electrical breakdown of the HV apparatus. Partial discharges are mainly caused by natural circumstances or by accelerated ageing of the HV insulation, but also manufacturing or installation failures can lead to harmful partial discharges. Therefore, the goal of partial discharge measurements is to detect the partial discharges in an early stage and to evaluate them in a proper way. Periodic, as well as permanent, partial discharge measurements have become one of the main criteria in assessing the quality and condition of HV equipment such as transformers, generators, switchgear and cable systems.
With our vast experience in different PD measurement technologies, we are your expert source when trying to select the appropriate technology for your PD testing needs. We offer a variety of PD measurement equipment as well as PD accessories.
HV TECHNOLOGIES, Inc. offers a wide range of accessories in order to conduct PD measurements. These accessories include special calibrators for calibrating standard PD measurement circuits to determine the apparent charge. Measuring impedances and coupling capacitors are offered for the decoupling of PD signals in standard measuring circuits according to IEC 60270.
We also offer UHF measurement technology, sensors, and UHF signal injectors. Unconventional measurement technology in higher frequency ranges (HF and UHF) is commonly used for on-site PD testing. This has the added benefit that an online test (i.e., no need to shut off the equipment under test) can be conducted since the measurement method does not require galvanic coupling to the high voltage conductors. Stronger attenuation of distant signals allows for very favorable signal-to-noise ratios and locally selective PD tests.
Our accessories include:
- Coupling Capacitors with various voltage and capacitance ratings
- Measuring Impedances
- PD, RIV, and UHF Calibrators
- UHF PD Sensors
- PD Filters for noise suppression
- Multiplexers for switching between multiple measuring impedances