Jianghai Geng
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View article: Analysis of condensation reports for box-type transformers in wind farms and research on predictive dehumidification power station technology
Analysis of condensation reports for box-type transformers in wind farms and research on predictive dehumidification power station technology Open
This paper focuses on the intractable condensation issues of box-type substations in wind farms that are frequently exposed to harsh conditions such as high humidity and large temperature differences. By thoroughly analyzing the environmen…
View article: Axial vibration characteristics analysis of transformer windings based on magnetic‐structural coupling correction model
Axial vibration characteristics analysis of transformer windings based on magnetic‐structural coupling correction model Open
Due to the strong coupling effect between the internal magnetic field and the structural field of the transformer, the magnetic‐structural coupling should be considered in axial vibration process of the winding short‐circuit impact. A 110 …
View article: Study on Preparation Technology of Novel Fluorosilicone Rubber Composite Insulator
Study on Preparation Technology of Novel Fluorosilicone Rubber Composite Insulator Open
Currently, commonly used external insulation materials for power products lack operational stability compared to high-temperature vulcanized silicone rubber. The excellent hydrophobicity of PTFE provides a direction for further enhancing h…
View article: Study on moisture absorption characteristics of glass fibre‐reinforced epoxy resin material for composite insulators based on the 3D‐Fick model
Study on moisture absorption characteristics of glass fibre‐reinforced epoxy resin material for composite insulators based on the 3D‐Fick model Open
Long‐term exposure to moisture leads to a gradual deterioration of performance and reduced service life of glass fibre‐reinforced epoxy resin (GFRP) material in composite insulators. Therefore, it is necessary to analyse the moisture absor…
View article: Study on the dynamic mechanical properties of winding‐block axial structure considering short circuit strain rate effect
Study on the dynamic mechanical properties of winding‐block axial structure considering short circuit strain rate effect Open
Transformers may suffer multiple short‐circuit impacts during long‐term operation, and axial instability is one of the typical types of serious accidents caused by short‐circuit faults. The axial instability form of the winding‐block struc…
View article: Study on the Mechanism Effect of Bending Loads on the Decay-like Degradation of Composite Insulator GFRP Core Rod
Study on the Mechanism Effect of Bending Loads on the Decay-like Degradation of Composite Insulator GFRP Core Rod Open
This paper investigates the deterioration of, and the abnormal temperature rise in, the GFRP core rod material of compact V-string composite insulators subjected to prolonged alternating flexural loading under wind-induced stresses. The ax…
View article: Effect of Multiple Reclosing Time Intervals on Axial Vibration of Winding
Effect of Multiple Reclosing Time Intervals on Axial Vibration of Winding Open
When a transformer suffers a permanent fault, it will suffer a short-circuit impulse again after reclosing. If the previous vibration of the winding is not attenuated completely and the winding is subjected to a secondary impulse within a …
View article: Investigating Aging Characteristics of Oil-Immersed Power Transformers’ Insulation in Electrical–Thermal–Mechanical Combined Conditions
Investigating Aging Characteristics of Oil-Immersed Power Transformers’ Insulation in Electrical–Thermal–Mechanical Combined Conditions Open
The condition and health of large oil-immersed power transformers’ insulation have a direct impact on the safety and stability of the power grid. Therefore, it is crucial to investigate the aging characteristics of oil–paper insulation in …
View article: Study on the Ageing Characteristics of Silicone Rubber for Composite Insulators under Multi-Factor Coupling Effects
Study on the Ageing Characteristics of Silicone Rubber for Composite Insulators under Multi-Factor Coupling Effects Open
Due to long-term exposure to high electrical field strength, heavy loads, and the complex climatic conditions in tropical coastal areas of China, widespread abnormal heating phenomena often occur in the operation of composite insulators in…
View article: Discharge characterization and altitude correction of shielding sphere-plate gap at an altitude of 3400 m
Discharge characterization and altitude correction of shielding sphere-plate gap at an altitude of 3400 m Open
Southeast Tibet in China is rich in clean energy such as water energy, light energy, and wind energy. As the key means of large-scale clean energy transmission in southeast Tibet, the ultra-high voltage (UHV) power transmission projects wi…
View article: Diagnosis Method of Decay-like Composite Insulators in a High-Humidity Environment Based on Characteristic Coefficient of Temperature Rise Gradient
Diagnosis Method of Decay-like Composite Insulators in a High-Humidity Environment Based on Characteristic Coefficient of Temperature Rise Gradient Open
At present, the temperature rise in insulators is observed using infrared thermometry as a common method of diagnosing decay-like insulators. However, the original characteristic data obtained by infrared thermometry cannot effectively dis…
View article: Research on Mechanical Properties of Winding Axial Bending Under Unbalance of Transformer Pad
Research on Mechanical Properties of Winding Axial Bending Under Unbalance of Transformer Pad Open
To improve the study on the influence of transformer windings and pad support on transformer short-circuit resistance, the calculation method of wire bending elastic modulus is analyzed, and the sample test is carried out: The influences o…
View article: Defect Identification of Composite Insulator Based on Infrared Image
Defect Identification of Composite Insulator Based on Infrared Image Open
The deterioration of a composite insulator’s mandrel will cause a serious power-grid accident, so it is necessary to find the defect as soon as possible. Infrared imaging is an effective means to detect mandrel-deterioration defects, but s…
View article: A Study on the Influence of End-Sheath Aging and Moisture Absorption on Abnormal Heating of Composite Insulators
A Study on the Influence of End-Sheath Aging and Moisture Absorption on Abnormal Heating of Composite Insulators Open
Abnormal heating of composite insulators of high-voltage transmission lines concentrate at its end, especially in a high-humidity environment. In order to study the influence of end-sheath aging and moisture absorption on abnormal heating …
View article: On‐load tap‐changer fault mode recognition based on the singular value of Hilbert energy spectrum time‐frequency matrix and spectrum entropy
On‐load tap‐changer fault mode recognition based on the singular value of Hilbert energy spectrum time‐frequency matrix and spectrum entropy Open
To solve the difficulty of eigenvalue extraction of on‐load tap‐changer (OLTC) vibration signals, an eigenvalue extraction method of time‐frequency matrix based on Hilbert energy spectrum and spectral entropy is proposed in this study. By …
View article: Research on Electric Field Detection of Degraded Insulators Based on a Sensitive Detection Method under Complex Operating Conditions
Research on Electric Field Detection of Degraded Insulators Based on a Sensitive Detection Method under Complex Operating Conditions Open
Insulators are the basis of the stable operation of transmission lines, and it is particularly important to regularly detect the insulation performance of insulators. After several years of research, contactless space electric field detect…
View article: Research on defect type diagnosis of composite insulator based on infrared detection technology
Research on defect type diagnosis of composite insulator based on infrared detection technology Open
Composite insulator is widely used in Hainan area of China because of its lightweight, small volume, good anti pollution flashover performance and many other advantages. Aiming at the problem of how to correctly judge the aging state of co…
View article: Lightning Failure Risk Assessment of Overhead Transmission Lines Based on Modified Dempster–Shafer Theory
Lightning Failure Risk Assessment of Overhead Transmission Lines Based on Modified Dempster–Shafer Theory Open
Lightning has a certain degree of potential threat to the safe operation of overhead transmission lines. In order to make targeted lightning protection arrangements and reduce the impact of lightning on overhead transmission lines, it is n…
View article: Corona Characteristics of a Large-Sized AC Grading Ring and Prediction of Corona Onset Field Intensity
Corona Characteristics of a Large-Sized AC Grading Ring and Prediction of Corona Onset Field Intensity Open
In order to ensure that corona discharge does not occur in the grading ring under normal operation, this paper studies corona characteristics of large-sized AC grading rings and a prediction method for corona onset field intensity (COI). F…
View article: A consistency method of discharge detection results at solar‐blind ultraviolet based on a radiation transmission model
A consistency method of discharge detection results at solar‐blind ultraviolet based on a radiation transmission model Open
Solar‐blind ultraviolet (UV) discharge detection based on UV signals in the solar‐blind band from 240 to 280 nm is an effective non‐contact discharge detection method for electrical equipment, but there is still a problem that the detectio…
View article: Super‐resolution reconstruction method of infrared images of composite insulators with abnormal heating based on improved SRGAN
Super‐resolution reconstruction method of infrared images of composite insulators with abnormal heating based on improved SRGAN Open
Abnormal heating of composite insulators on ultra‐high voltage (UHV) transmission lines is widespread under high humidity and heat in southern China. The infrared imaging technology can be used of quickly and effectively detect insulators …
View article: Intelligent computing and analysis of breakdown voltage of rod-rod long air gap
Intelligent computing and analysis of breakdown voltage of rod-rod long air gap Open
The discharge characteristics of air gap is one of the important factors to determine the insulation level which is crucial for electrical engineering construction. In order to calculate the 50% breakdown voltage of rod-rod air gap under d…
View article: Quantitative Research on Cumulative Effect of Transformer Winding and its Influence Degree Based on Time-Frequency Analysis of Vibration Signal
Quantitative Research on Cumulative Effect of Transformer Winding and its Influence Degree Based on Time-Frequency Analysis of Vibration Signal Open
View article: Quantitative Research on Accumulative Effect of Transformer Winding Deformation and Its Influence Degree Based on Time-Frequency Analysis of Vibration Signal
Quantitative Research on Accumulative Effect of Transformer Winding Deformation and Its Influence Degree Based on Time-Frequency Analysis of Vibration Signal Open
Winding deformation caused by short-circuit is one of the main causes of transformer damage. Even if the transformer successfully withstands one short-circuit impact, accumulative effect of multiple short-circuit impacts will cause sudden …
View article: Study on the influence mechanism of ambient humidity on the temperature rise of decay‐like composite insulators
Study on the influence mechanism of ambient humidity on the temperature rise of decay‐like composite insulators Open
At present, observing the temperature rise of composite insulators is an effective method for the detection of decay‐like defects. However, ambient humidity will affect the temperature rise of composite insulators, which will cause problem…
View article: Measurement of discharge channel based on background oriented schlieren technique using an optimized algorithm
Measurement of discharge channel based on background oriented schlieren technique using an optimized algorithm Open
Thermal ionization is the main characteristic of long air gap breakdown. Using the thermal characteristics of the discharge channel can not only analyze the formation and development mechanism of the leader discharge but also better reflec…
View article: Calculation of Electric Field on Substation Equipment considering AC Ion Flow Field
Calculation of Electric Field on Substation Equipment considering AC Ion Flow Field Open
With the increase of voltage levels in substation corona discharge on the surface of high voltage conductors and equipment in substations becoming more and more severe, the influence on the electromagnetic environment around substations is…
View article: Mechanical Fault Diagnosis of an On-Load Tap Changer by Applying Cuckoo Search Algorithm-Based Fuzzy Weighted Least Squares Support Vector Machine
Mechanical Fault Diagnosis of an On-Load Tap Changer by Applying Cuckoo Search Algorithm-Based Fuzzy Weighted Least Squares Support Vector Machine Open
To improve adaptability, feature resolution, and identification accuracy when diagnosing mechanical faults in an on-load tap changer (OLTC) of a transformer, in the present research, wavelet packet energy entropy is used to describe the in…
View article: Design and application of electron energy measurement system based on silicon photodiode
Design and application of electron energy measurement system based on silicon photodiode Open
The change in electron energy is the key to ionization. Studying the change law plays an important role in analyzing the gap discharge process. In this paper, an electron energy measurement system is designed based on a silicon photodiode,…
View article: Development and morphological characterization of ion wind in an inhomogeneous DC field
Development and morphological characterization of ion wind in an inhomogeneous DC field Open
Ion wind is a concomitant phenomenon arising from the process of discharge development, and is widely used in heat dissipation and ion neutralisation. The morphology characterization of ion wind was observed using a photo-electric joint mo…