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.

The effect of inverter characteristics on partial discharge and life behavior of wire insulation

Abstract: It has been demonstrated already that adjustable speed drives, and, in general, power electronics waveforms, can harm insulation systems of rotating machines, causing significant reduction of reliability and life. Indeed, the type of supply voltage made by repetitive impulses alters significantly the electric field distribution in the turn-to-turn and phase-to-ground insulation, and also the machine terminal peak voltage can be increased significantly, with respect to the expected value at the inverter output [1]–[11].

Localization techniques of partial discharges at cable ends in off-line single-sided partial discharge cable measurements

Abstract: Partial discharge (PD) field tests are widely used for cable assessment or cable commissioning. Usually, these tests are carried out by means of off-line tests where PD pulses are measured with capacitively coupled PD sensors. In off-line single-sided cable measurements, time-domain reflectometry (TDR) is used to locate the source of the PD along the cable. However, when the PD pulses are originated at the cable ends, the TDR technique cannot, by itself, properly distinguish between PD pulses produced at the cable near-end or at the far-end. This paper describes three different methods that produce an unambiguous localization of PDs produced at the cable ends, complementing the TDR.

Comparison of several theoretical sub-corona to corona transition relations with recent experimental results

Abstract: Fast partial discharge pulse data are compared with calculated results in a continuation of previous work that attempted to model the discharge phenomenon inside enclosed cylindrical cavities. It is shown that with the present electrode arrangement, the process in the enclosed cavities is a streamer. The classical capacitor model, the recent Pedersen model, and Paschen's law onset results are compared to the data. The preliminary thermal model is also considered. Pedersen's model gives results closer to experimental data then the simplistic capacitor model. The streamer model corresponds with Paschen's onset expression over a limited range, although there is no deterministic relation. >

Partial discharging detecting device of switch cabinet

Abstract: The invention relates to a partial discharging detecting device of a switch cabinet The partial discharging detecting device comprises an ultrahigh frequency sensor, an ultrasonic sensor, a high frequency current transformer and a transient earth voltage (TEV) sensor which are used in the field of sensors for measuring partial discharging The partial discharging detecting device collects data of various sensors through a monitoring system so as to achieve measurement of partial discharge capacity inside the switch cabinet conveniently and effectively and conduct precise locating of partial discharging positions and provides data monitoring proof for insulation performance estimation of the switch cabinet

Development of UHF Sensors for Partial Discharge Detection in Power Transformer

Abstract: Partial discharge (PD) is a symptom of insulation defect or degradation in high-voltage power equipment. To detect the occurrence of PDs inside oil-filled power transformers, the ultra-high frequency (UHF) detection method is one that can be applied. To date, the sensors, as the most important part in the UHF method, have not been adequately addressed in terms of sensitivity and accuracy. This paper presents a novel UHF sensor called microstrip-fed planar elliptical monopole antenna. This antenna has a simple structure and ultra-wide frequency band. It is designed and simulated using CST software for parametric optimization. Following fabrication, its performance verification is carried out using an experimental test setup for PD source. In addition, comparison is made between various UHF antennas regarding their advantage and limitation. The results show that the new UHF antenna is suitable for PD detection in oil-insulated transformer and its ultra-wide bandwidth frequency response can be a useful means for PD recognition.