Ultra-high-frequency (UHF) sensing technique has been introduced to detect and localize partial discharge (PD) sources in air-insulated substation (AIS). This paper presents a probability-based algorithm multiple PD which may occur simultaneously different power equipment. Assuming that the time difference of arrival (TDOA) between all pairs antennas array are normally distributed, probability density function (PDF) source coordinates can be obtained by substituting linearized form equations...

In the synthetic test of high-voltage circuit breakers, insulation failures occur very often when breaker operates frequently. It is important to diagnose early fault in test. However, installed voltage and current sensors are designed measure low-frequency components, such as power frequency current. difficult detect high-frequency partial discharge caused by breaker's fault. The can generate a radiated electromagnetic pulse. Even weak discharge, which causes small change current, large...

The Late Mesozoic tectonics strongly reworked the tectonic framework of East Asia. In South China Block (SCB), major phenomena are featured by numerous magmatic activities, (half-) graben basins opening, and abundant ore deposits formation. intrinsic relationships these with regime still hotly debated, partly due to lack structural data. To advance understanding issues, we conducted a detailed analysis including field microscopic observations as well an Anisotropy Magnetic Susceptibility...

Ultra-high-frequency (UHF) antenna array system is applied to detect and locate partial discharge (PD) sources in air-insulated substation (AIS). Time-difference localization algorithm generally adopted such which the of large scale. In this paper, phased theory from radar field introduced estimate direction-of-arrival (DOA) PD source reduce size. The DOA estimation results are calculated by two-sided correlation transformation (TCT) focusing multiple signal classification (MUSIC) algorithm....

A project for a 30 m, 35 kV /2 kArms, 3 phase, warm dielectric HTS power cable system is underway in China. This will be installed the China Southern Power Grid at Puji substation Kunming, Yunan province, 2004. We have carried out series of experiments to investigate possible winding angles and layer configurations conductor with Ag sheathed Bi-2223 tapes, different LN2 cooling mechanisms, termination configurations, fabrication techniques. For better understanding basics an practising new...

Partial discharge (PD) measurement is an effective tool for insulation condition assessment of high-voltage power equipment. The occurrence multiple PD sources causes great difficulty on pattern recognition and failure risk assessment. This paper presents a self-adaptive separation algorithm based optimized feature extraction cumulative energy (CE) function. CE functions in time domain (TCE) frequency (FCE) are calculated from waveforms their FFT spectrums, respectively. By using oblique...

Mode-division multiplexing is significant in optical communications, and a vector vortex beams (VVBs) set one of the candidates orthogonal set. Although basic (de)multiplexing scheme has been promoted, there still great potential to enable more VVBs with high efficiency. In this work, we promote mode sorter based on Sagnac interferometer Q-plate solve problem. The acts as according |ℓ|, takes an effect shift indices m. Since our achieved by coupling between polarization orbital angular...

This study is aimed at investigating the relationship between red cell distribution width (RDW) and chronic obstructive pulmonary disease (COPD) patients with embolism (PE).We conducted a retrospective enrolling total of 125 from January 2013 to December 2019. The group consisted 40 COPD PE, control had 85 without PE. Clinical data including demographic characteristics, comorbidities, results imaging examinations laboratory tests were recorded. Blood biomarkers, blood standard deviation...

Using few-layer tungsten disulfide (WS2) doped polyvinyl alcohol as a saturable absorber for the initiation of pulse generation, we experimentally demonstrate stable passively Q-switched mode-locked operations Tm, Ho:LiLuF4 laser at 1895 nm first time. The is designed with an X-type four-mirror cavity and pumped by Ti:sapphire operated 785 nm, its continuous operation initiated when absorbed pump power 143 mW. When reaches 2.645 W, obtain maximum output 985 mW crystal slope efficiency 39.8%...

With the help of an extended mapping approach, a new type variable separation excitation with three arbitrary functions (2+1)-dimensional dispersive long-water wave system (DLW) is derived. Based on derived excitation, abundant non-propagating solitons such as dromion, ring, peakon, and compacton etc. are revealed by selecting appropriate in this paper.

Geo-magnetically induced currents (GICs) have at-4 tracted more attention since many Ultra-High Voltage (UHV) 5 transmission lines been built, or are going to be built in 6 the world.However, when calculating GICs based on classi-7 cal model, some input parameters, such as earth conductivity 8 and dc resistances of grid, uncertain very hard 9 determined advance.Taking this into account, uncertainty 10 quantification (UQ) model geo-electric fields is pro-11 posed paper.The UQ maximums 12...

A Wick-type stochastic Korteweg–de Vries equation is researched. We establish a relationship between the and elliptic equation. With help of Hermit transformation mapping method, we obtain series exact Jacobi function solutions to in white noise environment.

A Wick-type stochastic mKdV equation is researched. By the means of Hermite transformation, white-noise theory and a modified mapping method, various types exact solutions are derived.

The modeling, analysis, and design of large complex composite structures involve the use finite element approach. In most practical applications structural material parameters vary considerably are subject to uncertainties, mainly because uncontrollable aspects associated with manufacturing assembly materials. many cases, probabilistic methods cannot be applied probability distributions uncertain not usually known. Also, in some situations known only linguistic form. this work, uncertainties...