Lithium-ion battery State of Health (SOH) estimation is an essential issue in management systems. In order to better estimate SOH, Extreme Learning Machine (ELM) used establish a model lithium-ion SOH. The Swarm Optimization algorithm (PSO) automatically adjust and optimize the parameters ELM improve accuracy. Firstly, collect cyclic aging data extract five characteristic quantities related capacity from charging curve increment curve. Use Grey Relation Analysis (GRA) method analyze...

Failure mechanism due to corona aging and characteristics of PD (partial discharge) on nano doped PI (polyimide) film are investigated under bipolar impulse voltage. Chemical characterization material is analyzed through SEM (scanning electron microscope) FTIR (Fourier transform infrared spectroscopy). The results show that failure specimens mainly caused by surface discharge which could be suppressed the addition particles. Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

The acidic environment is one of the main factors leading to aging silicone rubber (SiR) insulators. Aging can reduce surface hydrophobicity and pollution flashover resistance insulators, threatening safe stable operation power grid. Therefore, evaluating state insulators essential prevent accidents on transmission line. This paper based an optical hyperspectral imaging (HSI) technology for pixel-level assessment insulator status. Firstly, SiR samples were artificially aged in three typical...

This paper presents a machine learning-based approach to identify and separate partial discharge (PD) two typical pulse interference (PI) signals in the vehicle-mounted cable terminations of high-speed electric multiple units (EMUs). First, test platform was established capture PD PI these terminations. The acquired were then processed using square envelope method extract feature parameters, such as rise time proportion, left–right symmetry, upper–lower symmetry. signal classification...

Cable termination serves as a crucial carrier for high-speed train power transmission and weak part of the cable insulation system. Partial discharge detection plays significant role in evaluating status. However, field testing signals are often contaminated by external corona interference, which affects accuracy. This paper proposes classification model based on wavelet transform (WT) deep belief network (DBN) to accurately rapidly identify partial vehicle-mounted terminals. The method...

Pollution flashover of insulators has been viewed as a common issue existing in the area power systems for long term. However, traditional detection methods such equivalent salt density and leakage current (LC) can hardly satisfy requirements progressing smart grid. Herein, novel highly-efficient method is proposed classifying pollution degree based on hyperspectral technology. The insulating sheets actual were set research object their images are obtained. Moreover, data describing...

The high-speed railway (HSR) has become more important in modern society. However, the rail potential rises remarkably, because of high leakage resistance to earth with use ballastless track and huge traction return current on rail. That is a serious threat passengers' equipment safety along railway. Integrated grounding line (IGL) can decrease obviously. Its structure quite different from rods non-HSR substations. Meanwhile, IGL goes entire railway, its parameters' optimization obtain...

High-speed airflow, which is generated around trains running at a high speed, causes uneven pollutant distribution on insulator surfaces and changes their insulation properties. In this paper, method has been proposed to calculate the residual resistance polluted insulator. Based analysis of flashover model, influence pollution along was discussed. Analysis result showed that voltage would increase when decreased compared conditions with uniformly distributed pollutant, vice versa. It...

To understand the flashover of roof insulators in high-speed airflows, breakdown characteristics and mechanisms a short needle-plate air gap are investigated. An interesting important phenomenon is found based on an artificial wind tunnel: voltage first increases then decreases. experiential formula established to describe relationship among airflow velocity, distance, voltage. A good consistency with experimental results obtained. Furthermore, airflows proposed, explained verified according...

With the launching of Lanzhou-Xinjiang high-speed railway in Northwest China, train running sand environment will cause strong airflow with around it, which seriously threats long-term service performance roof insulators. To study flashover characteristics insulator under condition, a small size wind tunnel system is established to simulate environment, influence speed, particle and flux on voltage cylindrical investigated. Results show that, pure has an increase-decrease variation trend...

Using an artificial wind tunnel, the three basic preconditions presented in preceding article by Kang et al are experimentally verified and systematically analyzed. The experimental results confirm that, a discharge of flowing air, breakdown path air gap deflects at angle along direction airflow. Some electrons ions blown away airflow, mean free electron increases with increasing airflow velocity. In addition, physical essences effects on revealed, differences between uniform non-uniform...

Active flow control based on surface dielectric barrier discharge (SDBD) has become a focus of research in recent years, due to its unique advantages and diverse potential applications. Compared with the conventional SDBD straight electrodes, serrated electrode-based great advantage 3D topology. It is believed that boundary layer separation moving objects can be controlled more effectively this new type SDBD. In electrode, R (tip sharpness) N number per unit length) have influence induced...

The grounding performance of EMU (Electric Multiple Unit) is related to the safe operation high-speed train, and unreasonable protective scheme can bring problems such as abnormal wear brush, high electrical potential train body, etc. At present, brushes CRH380B seriously often need be replaced. Therefore, it necessary optimize CRH380B. In this paper, a simulation model for current distribution in system highspeed established by pspice software based on CRH380B, validated comparing results...

Partial discharge (PD) measurement and its pattern recognition are vital to fault diagnosis of transformers, especially those traction substation transformers undergoing repetitive load shocks. This paper presents the primary factors induced by shocks including high total harmonics distortion (THD), transient voltage impulse high-temperature rise, their effects on feature parameters PD. Experimental tests conducted six artificial PD models with these introduced one one. Results reveal that...

The on-board cable terminal is the main electrical equipment in a moving train set's high-voltage system, and stability safety of this are essential preconditions. To study impact air gap flaws terminals on insulation performance, paper builds model between stress tube vehicle terminal, investigates distinctions internal electric field distribution gaps existing terminals, scrutinizes size terminals. partial discharge with different lengths defects was studied, under temperature variations...

The influence of varying shim layers on the progressive damage/failure a composite component in bolted composite-aluminum aerospace structural assembly was investigated using non-linear three-d imensional (3D) solid elements assembled model carbon fiber-reinforced polymer (CFRP)-aluminum single-lap joint with titanium (Ti-6Al-4V) fastener and washer generated commercial finite element (FE) software package, ABAQUS /Standard. A failure algorithm written Fortran code set appropriate...

With the raise of high-speed train's speed, traction power gradually increases. The number controlling and communication equipment are also increased. So, electromagnetic environment in carriage become worse. It is a big threat for train passengers' safety. In this paper, based on theory field, three-dimensional finite element model concluding pantograph, train, high voltage cable was established. fields distribution some important sections analyzed. field studied under condition normal...

With the development of High Speed Railway (HSR) in China, demand for increasing HSR's speed become more and intensively. Switch-ground automatic phase-separation convert is an efficient method to speed. But use ground converting switch, over-voltage frequently appears at process phase-separation. It harmful equipments safety. In order handle it, impacting factors on have been studied insight. Relationship between phase are analyzed. According analyzing result, suitable switching time switch...