Ultra-sensitive detection of partial discharges
| Reference number | |
| Coordinator | RISE Research Institutes of Sweden AB - SP Mätteknik, Borås |
| Funding from Vinnova | SEK 860 000 |
| Project duration | January 2017 - February 2020 |
| Status | Completed |
Purpose and goal
Traceable partial discharge (PD) calibration at RISE, the national DC / LF electricity metrology, has been improved from 0.5 pC (picoCoulomb electric charge), and PD calibrator calibration service for Swedish industry is now established with the lowest PD level of 0.1 pC and a measurement uncertainty of 0.001 pC. Two methods were validated in collaboration with EMPIR 15NRM02 UHV and are approved. Methods and equipment were presented at CPEM2018 and ISH2019 and published in IEEE TIM and Springer. New current sensors were developed for detection of PD in DC high voltage circuits.
Expected results and effects
Two methods were developed for PD signal processing. RISE now calibrates 0.1 pC with a measurement uncertainty of 0.001 pC, which boosts the industry in optimization of insulation materials and support insulation monitoring in power grids. A new generation transient recorder were developed with high dynamics, is now available on the market, and are needed for PD detection during e.g. DC stress. New advanced current sensors were developed for the design of e.g. high voltage cables and inverters and is a key to RISE´s role in EMPIR 19ENG02 FutureEnergy developing new analytical methods.
Planned approach and implementation
Two concepts with new methods have been developed for PD detection according to plan. The first method is a direct integration of signals from a newly developed transient recorder (PXIe-5164) and new analysis tools for easy operation. The second method is an intergrator solution with built-in charge amplifier and subsequent analysis. A comparison between four NMIs was conducted within EMPIR 15NRM02 UHV. Performance for the transient recorder was presented on and published (peer-review) via CPEM2018 and the comparison measurement with the methods described on ISH2019 as planned.