Partial discharge

About: Partial discharge is a research topic. Over the lifetime, 13997 publications have been published within this topic receiving 102058 citations. The topic is also known as: PD.

A fluorescent plastic optical fiber sensor for the detection of corona discharges in high voltage electrical equipment

Abstract: The reliability of electrical equipment in high voltage systems can be affected by certain defaults (metallic particles, roughness, etc.) inside the device enclosure. These anomalies may cause a local glow discharge which propagates progressively inside the insulator and which can lead to electrical breakdown. To avoid this end result, corona discharges have to be detected with a system which satisfies some requirements. Actual methods are not well adapted to industrial constraints. An optoelectronic setup, consisting of a fluorescent plastic optical fiber as a light sensor, connected to a simple, low‐cost amplifier, is proposed. Measurements were first carried out in air to demonstrate the feasibility of this detection method, then air was replaced by SF6. Results lead to the delineation of a sensor made of the fluorescent fiber and the associated amplifier.

Dielectric barrier discharge device

Abstract: A dielectric barrier discharge device in which uniformity of the light irradiation energy density is achieved, even if dielectric barrier discharge lamps have variations with respect to the lamp material and the processing. The dielectric barrier discharge device has at least one dielectric barrier discharge lamps and a feeder device for applying an AC high voltage to the electrodes of the dielectric barrier discharge lamp, the dielectric barrier discharge lamp having a discharge gas-filled discharge gap which produces excimer molecules by a dielectric barrier discharge and one dielectric between at least one of the electrodes and the discharge gap for inducing the discharge phenomenon in the discharge gas. Uniformity of the light irradiation energy density is achieved is achieved in this dielectric barrier discharge device by the feeder device applying the AC high voltage such that an operating state for time interval (Ta) in which in the dielectric barrier discharge lamp produce a discharge emission is repeatedly alternated with an operating state for a time interval (Tb) in which essentially no discharge is produced, or in which a lower voltage is applied within a range that is only sufficient to maintain discharge in the dielectric barrier discharge lamps.

On-line partial discharge monitoring of HV components

Abstract: Partial discharge (PD) measurements are an important tool to assess the condition of the insulation of high-voltage systems. Preferably, these measurements are done on-line during regular operation. This paper gives an overview of developments and experiences with online PD measurements in The Netherlands on turbine generators, transformers and switchgear.

Modeling of High-Frequency Current Transformer Based Partial Discharge Detection in High-Voltage Cables

Abstract: Partial discharge (PD) testing of high-voltage (HV) cables and cable accessories has been implemented predominantly using high-frequency current transformers (HFCTs) as PD sensors. PD currents initiating at PD sources are coupled onto cable conductors. They travel away from the PD sources and are detected by HFCTs installed at cable terminations. In this paper, based on combining finite-difference time-domain (FDTD) modeling and transfer function theory, a hybrid modeling approach is proposed to investigate the processes of PD coupling and detection involved in HFCT-based PD testing of HV cables. This approach allows exciting a PD event anywhere in FDTD models of the cables and predicting output from HFCTs some distance away. Implementation of the method is illustrated using an 11 kV XLPE cable. Moreover, a “direct measurement” method of obtaining original PD pulses as the excitation source waveform is presented. The modeling approach introduced here will facilitate studies on the relationship between measured PD signals and those excited at PD sources, which can potentially give useful insight into the basic mechanisms behind PD detection in cables.

Modeling memory phenomena for partial discharge processes in insulation cavities

Abstract: Partial discharge measurements performed at 0.1, 20, 50 and 300 Hz and at different voltage levels are compared with simulations based on models available in literature. It is shown that these models need to be improved to be able to fully extrapolate PD behavior at different frequencies. A solution based on a time-dependent increase of the work function when detrapping from negative charged surfaces is proposed and verified on the basis of experimental data.