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.

Towards Optical Partial Discharge Detection with Micro Silicon Photomultipliers.

Abstract: Optical detection is reliable in intrinsically characterizing partial discharges (PDs). Because of the great volume and high-level power supply of the optical devices that can satisfy the requirements in photosensitivity, optical PD detection can merely be used in laboratory studies. To promote the practical application of the optical approach in an actual power apparatus, a silicon photomultiplier (SiPM)-based PD sensor is introduced in this paper, and its basic properties, which include the sensitivity, pulse resolution, correlation with PD severity, and electromagnetic (EM) interference immunity, are experimentally evaluated. The stochastic phase-resolved PD pattern (PRPD) for three typical insulation defects are obtained by SiPM PD detector and are compared with those obtained using a high-frequency current transformer (HFCT) and a vacuum photomultiplier tube (PMT). Because of its good performances in the above aspects and its additional advantages, such as the small size, low power supply, and low cost, SiPM offers great potential in practical optical PD monitoring.

Partial discharge site location system for determining the position of faults in a high voltage cable

Abstract: A pulse discharge site location (PDSL) system (12) is provided which captures pulses on a conductor without requiring the triggering functions of an oscilloscope. The PDSL system (12) comprises a pulse discharge measurement (PDM) system and is programmed to store the data captured by the PDM system in a reference buffer (46) corresponding in size to the propagation time of a pulse along the length of the conductor. Samples of the captured pulses are scanned to locate the peaks of pulses above a selected noise level. These pulses are stored into a temperary working buffer, along with a selected number of samples, normalized and then added to the reference buffer (46). The reference buffer (46) provides a statistical average of pulse activity. Fault site distances from the end of the cable can be determined due to the proportional dimension of the reference buffer (46) with respect to the length of the cable and cable propagation time.

Design and Analysis of a High-frequency CLLC Resonant Converter with Medium Voltage insulation for Solid-State-Transformer

Abstract: The isolated DC/DC converter is the key component in high-frequency medium-voltage solid-state transformer. This paper presents a comprehensive design of a CLLC converter, including the design of transformer and resonant tank. The transformer insulation is designed to pass the partial discharge and applied voltage test. And its impact on transformer leakage inductance, as well as the resonant converter characteristic is discussed. Also, the transformer is optimized based on loss and volume trade-off. Then the relation of zero voltage switching (ZVS) condition and circuit parameters and load condition is derived from equivalent circuit. The impact of magnetizing inductance, leakage inductance, MOSFETs junction cap, and characteristic factor Q on ZVS condition is revealed. Finally, this paper provides a guidance to select dead-time appropriately and demonstrates the design on a 200kHz converter with 1.6kV input and 1.1kV output, and achieves a peak efficiency of 98.9%.

Determination of gas pressure in vacuum interrupter based on partial discharge

Abstract: Partial discharge characteristics in air under a low vacuum region were studied to develop a diagnosis technique to determine the gas pressure in a vacuum interrupter. The pressures were set at from 1.3 Pa to 2.6 kPa in order to simulate the leakage of gas into the vacuum interrupter. The structure of the vacuum interrupter, the measurement and the circuit construction for the experimental setup were described. The measurement of partial discharge occurring inside the vacuum interrupter was performed with a current transformer, intensified charge coupled device (1CCD) camera and photomultiplier tube. The measurement of partial discharge light intensity with a photomultiplier tube was more sensitive compared with that measured with a current transformer. From this result, an attempt has been made to distinguish the pressure below and above 260 Pa on the basis of the rise time and peak intensity of discharge light pulses. A relatively longer rise time (2 mus) with a smaller magnitude (less than 0.5 mA) was attributed to a Townsend-like discharge at pressures below 260 Pa, while a sharper rise time ~(10-100 ns) with a larger magnitude (greater than 1 mA) was characterized as a streamer-like discharge above 260 Pa. In addition, the estimation of gas pressure in a vacuum interrupter was made based on phase-resolved discharge characteristics utilizing an artificial neural network.

Power processor circuit and method for corona discharge pollutant destruction apparatus

Abstract: A solid-state power processor circuit and method is used to supply power to generate a discharge in a corona discharge pollutant destruction apparatus. The circuit uses field effect transistors (FETs) and integrated circuit devices based upon metal oxide semiconductor field effect transistor (MOSFET) technology to amplify low-voltage pulse signals to high voltage levels. A resonator in the power processor circuit generates sinusoidal oscillation from the high voltage pulses, and provides the high-voltage, high-frequency electrical power necessary for corona discharge.