A5102979399- High voltage insulation and dielectric phenomena
- Power Transformer Diagnostics and Insulation
- Electrical Fault Detection and Protection
- Lightning and Electromagnetic Phenomena
- Electrostatic Discharge in Electronics
- Aerosol Filtration and Electrostatic Precipitation
- Thermal Analysis in Power Transmission
- Dielectric materials and actuators
- Textile materials and evaluations
- Analytical Chemistry and Sensors
- Material Properties and Processing
- Electromagnetic wave absorption materials
- Advanced Cellulose Research Studies
State Key Laboratory of Electrical Insulation and Power Equipment
2024
Xi'an Jiaotong University
2024
State Grid Corporation of China (China)
2018-2023
Global Energy Interconnection Research Institute North America
2018
In the traditional direct-current (dc) breakdown test method, a large uncertainty is associated with using strength of 1-mm-thick samples as basis to determine insulation thickness in cable design because flashover. An electrode-embedded fully extruded molding sample proposed this work. Finite-element methods are used verify no surface flashover characteristic. The dc tests on crosslinked polyethylene (XLPE)-A and XLPE-B an hundreds microns several millimeters conducted at different...
The cross-linking byproducts affecting the conductivity of cross-linked polyethylene (XLPE) determine electric field distribution and temperature stability cable insulation, thus detection residual plays an important role on reliability High Voltage Direct Current (HVDC) system. This paper employs time-dependent polarization current measurement to investigate dielectric relaxation in XLPE with different contents byproduct at extra-low frequency (ELF). results show that two Debye-type...
This passage discusses the high voltage direct current (HVDC) cable employed in submarine power transmission and its weaknesses, specifically factory joint. The recovered process of insulation when manufacturing joint involves reheating bulk near them, which can cause changes dielectric properties crystalline morphology cross-linked polyethylene (XLPE). result accumulated space charge distorted electric field at interface between recovery due to a mismatch parameters. paper use both...
With the rapid development of UHV DC transmission technology, high voltage insulation epoxy support insulator as key is very important to wall bushing. As an insulating material, resin widely used in power system. However, its breakdown characteristics have been problems restricting direct current equipment. In this paper, we ANSYS build up three-dimensional simulation model sample, and calculated electric field distributions under spherical electrodes. We also manufactured laminate neat...
The phenomenon of electrical trees in DC cable insulation is the main threat to operation. three-capacitance model one common models used characterize internal defect discharge insulation. In this paper, equivalent circuit established based on tree, and analyzed under different conditions discharge, influencing factors apparent quantity change during tree process are obtained from perspective capacitance, finite element simulation software calculate capacitance directly according electrode...
With the increased demand for long-distance power transmission, high voltage direct current (HVDC) technology has developed rapidly. And cross-linked polyethylene (XLPE) extruded cables as key equipment play an important role in HVDC transmission. In this paper, influence of temperature and electrical field on conductivity XLPE insulation was discussed. Besides, relationship between simulated. The described by Arrhenius equation. conductivity-electrical analyzed via Poole-Frenkel model....
Electric tree branches are a typical defect in cross-linked polyethylene high-voltage DC cables, and their initiation growth will ultimately lead to cable breakdown. And the physical chemical properties of XLPE have certain effect on branches. In this paper, for AC were used prepare pressed sample pieces, samples obtained from finished cables. The physicochemical different studied by means DSC, XRD, GPC. through electrical experimental system, process partial discharge characteristics needle...
The doping of nanofillers is considered to be an effective method effectively suppress the space charge cross-linked polyethylene (XLPE) insulating materials used for high-voltage direct current (HVDC) cables. For large cross section HVDC cables, very high cleanliness standard XLPE demanded. During extrusion process insulation usually filtered impurities by passing through one precision filter with more than 500 meshes a long time. Besides, long-term processing stability great importance....
The contact-free method, due to its proven accuracy enhancement by avoiding the issues induced from electrode contact, have attracted more attentions on application in diagnostics of polymeric materials. Recently, several new ways for correction contact free measurement been proposed, and permittivity calculation based these methods also shown a good agreement with experimental data. field distribution under an alternative is known not only depends permittivity, but conductivity. As...
The return insulation structure of submarine cable factory joint can be simplified as homo-crosslinked-polyethylene (H-XLPE) bilayer, and its dielectric property under power frequency is the key to offshore alternating current (AC) electric field transmission system. This paper focuses on AC breakdown strength electrical tree H-XLPE bilayer by using high voltage generator relevant electrode results show that overall lower than XLPE. branches diverge obviously in which not existence XLPE same...
X-ray has been gradually applied in China as an auxiliary method for power cable defect detection. This a good effect on the detection of structural or partial discharge defects. However, due to high energy X-rays, people are worried that it may damage performance materials cables. The current research focuses XLPE, this paper we conduct PVC and semiconducting layer materials. Samples were irradiated with different doses x-rays, insulation properties samples measured. results have shown...
The performance of low-density polyethylene (LDPE) restricts the development cable insulation in China. Compared with imported LDPE, domestic LDPE has a great space to improve. (A and B) used this paper were obtained by extraction. samples (1#, 2#, 3#) materials taken from at different stages process optimization. DC breakdown strength, electrical conductivity mechanical properties carried out. results show that continuous optimization material, characteristics material are greatly improved....