The research on intelligent diagnostic models for power transmission and transformation equipment has attracted increasing interest. In the design of practical models, supervised learning strategy is often used. This put forward higher requirements number labeled data. However, in industrial applications, cost collecting a large relevant data effectively labeling high. At same time, case unknown faults, lack prior knowledge makes accurate classification difficult to achieve. work designs...

During the long-term operation of DC grounding electrode converter station, there are often hazards such as heating and aging coke layer, burning corrosion at connection between feed rod cable, resulting in break problems cable rod. Currently, operational status monitoring electrodes primarily relies on daily tracking well temperature, humidity, water level characteristics; periodic testing; on-site excavation. However, above methods cannot accurately obtain breakage location information To...

Constant false alarm rate (CFAR) detector is a class of widely used methods for target detection in radar images. Classical CFAR detectors perform on pixel-by-pixel basis using certain sliding windows estimating clutter statistics, which run fast small However, as the image size gets large, time cost these will increase significantly since complexity with respect to <i>N</i> &#x00D7; <i>N</i>-pixel <i>O</i>(<i>N</i>²). In practice, images, such those synthetic aperture (SAR),...

Grounding electrodes with good current discharging performance can ensure the reliability of power system security. Discharging is not only reason for accelerating corrosion, but also key indicator grounding electrodes' performance, which directly affects resistance, step voltage, ground potential distribution, and other macro parameters. This paper focuses on distribution horizontal vertical electrodes. Based FEM space tetrahedron coordinate transformation method, calculation model lead...

Tower grounding device provides the discharging channel for fault currents, ensuring safe and reliable operation of transmission lines. However, carbon steel tower is prone to corrosion, which affects performance causes potential safety hazards. Existing evaluation methods are divided into subjective through excavating objective experimental detection. these suffer from poor accuracy in results. In order solve above-mentioned problems, this paper proposed a comprehensive method corrosivity...

Overhead ground wires typically have strong axial tension and are prone to structural defects caused by corrosion lightning strikes, which could lead serious safety hazards. Therefore, it is important detect accurately quickly avoid those problems. Existing defect detection methods for overhead mainly traditional metal methods, including eddy current detection, ultrasonic manual visual inspection. However, problems of low efficiency, high environmental requirements, insufficient reliability....

Accurate grounding parameters calculation ensures the safe and stable operation of power equipment, Green's function layered soil is basis calculation. The conventional complex image method for mainly include global equal interval sampling Prony's fitting method, which often have 2 disadvantages: 1. exponential terms are usually twice number layers, amount increases linearly with layers; 2. cannot guarantee to accurately approximate integral kernel function, causing failure solve some soils....

Reinforced concrete (RC) structures are applied widely in low-voltage transmission towers. However, the structural damage caused by corrosion or fracture of rebar cement towers seriously affects safety lines. Thus, accurate detection can effectively maintain There many methods for detecting corrosion, but most them cannot accurately locate and they do not consider factors such as depth different types rebar. Therefore, this article proposes a method based on change peak slope magnetic flux...

The grounding electrodes are buried in a harsh soil environment, which will cause corrosion. Corroded directly affect the safe and stable operation of power system. Therefore, it is particularly important to detect corrosion degree accurately. existing methods have following problems: 1) Power-frequency resistance used as single criterion, lack considering impulse characteristics, difficult accurately judge could potential safety hazard. 2) Lacking environmental PH value, water content, salt...

Abstract Tower impulse grounding resistance is important for judging the lightning protection performance of transmission lines. Therefore, it significant to accurately measure tower resistance. Existing measurement methods mainly contain real‐type test method and coefficient method. However, requires heavy complex excitation measuring equipment, which difficult be used in a practical environment. The adopts empirical equations, could have large errors different environments. To solve above...

The radome is an important component of the aircraft seeker. high-speed usually has ablation, which affects electromagnetic performance radome. Therefore, it to study wall during high-temperature ablation. However, most existing studies mainly consider influence temperature and ignore structural changes caused by To solve above problems, this paper ablation on inhomogeneous walls (IRW) considering structure parameters, thermal expansion characteristics, dielectric parameters two typical...

Grounding electrodes are used to ensure safe operation of electrical apparatus. The limited axial construction space for grounding is a significant constraining factor. performance will attenuate rapidly under the influence reduced length horizontal or vertical electrodes. However, if additional resistance-reducing measures adopted, and maintenance cost considerably increase. To solve above problem, this study proposed novel model that uses helical electrode improve within space. Firstly,...

Abstract Calculated parameters (soil layer resistivity, soil thickness, and the number of layers) horizontally layered are usually obtained based on measured apparent resistivity under different measurement distances, which significant for design, operation, maintenance grounding grids. Most existing calculation methods just trying to make results approach data, ignoring relationship among calculated parameters, would increase workload measurement. To better balance distance range data...

Abstract The Tower grounding grids are important power facilities for transmission line protection. accurate measurement of resistance provides data support the safe operation grids. existing methods mainly based on 0.618 method, which has two disadvantages: (1) distance between voltage electrode and measuring point should not be less than 2.5× length scattered electrode; (2) long wires ensure accuracy but long‐distance electrodes makes it difficult to carry out in complex environment. To...

An innovative method based on optimal injection current is introduced to calculate reactive compensation capacity during unbalanced three-phase distribution transformer operation. This offers a new process that governs the transformers compared with susceptance and calculates operation of power electric control equipment through reverse thinking. Compensation effect further optimised by adding reasonable restrictive conditions neglecting inductive combined practical electrical engineering...

Grounding electrode corrosion occurs in soil, products deposit on the surface prone to form sedimentary layer. As electric current flow out grounding will accelerate rate, and greatly affect depositing process. The formation of layer changed structure physical chemical properties between interface which seriously spillage characteristics electrode. In order study mechanism influence spilling process products, a dynamic model is established. By analyzing model, with progress process, surface,...