Abstract
Partial discharge (PD) denotes a small, localized electrical discharge in the insulation between conductors, occurring when the local electric field strength exceeds a critical value. Prolonged exposure to partial discharges is known to degrade the dielectric behavior of the insulation and may even lead to complete breakdown. PD testing of high-voltage equipment and electrical apparatus is one of the most important and difficult tasks in high-voltage testing. This chapter describes the measuring instruments, the calibration methods and the test circuits for measuring the so-called apparent charge. For most apparatus, special PD measurement methods with computerized data processing have been developed, which are constantly being improved. Key words are on-site PD measurements after installation of the equipment, localization of single or multiple PD sources in spatially extended apparatus, synchronous multichannel PD measurement, VHF and UHF PD measurement techniques, permanent PD online monitoring and interference suppression methods. Partial discharges are associated with electromagnetic, acoustic, optical and chemical effects, which are also exploited for their detection and diagnosis, in particular in complex apparatus such as three-phase power transformers and gas-insulated switchgear (GIS). The PD measurement techniques at DC and impulse voltages are briefly discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
