A5037909245- High voltage insulation and dielectric phenomena
- Thermal Analysis in Power Transmission
- High-Voltage Power Transmission Systems
- Power Line Inspection Robots
- Electrostatic Discharge in Electronics
- Plasma Diagnostics and Applications
- Elevator Systems and Control
- HVDC Systems and Fault Protection
- Power Transformer Diagnostics and Insulation
- Lightning and Electromagnetic Phenomena
- Aerosol Filtration and Electrostatic Precipitation
Xi'an Jiaotong University
2016-2019
State Grid Corporation of China (China)
2019
Surface charge accumulation on insulators is one of the bottlenecks for development DC electric power system. This paper studies a ±200 kV basin-type insulator designed GIL (Gas-insulated Transmission Line). A surface measurement device made consisting 3-dimension, 4-axes manipulating device, HV shielding conductor installation system and data acquisition new scaling method probe with an inversion algorithm using Cholesky decomposition proposed to obtain density distribution. The dynamic...
The discharge characteristics of SF6 dependent on gas pressure under extremely inhomogeneous electric fields are strongly nonlinear and must be carefully considered when optimizing gas-insulated equipment insulation design defect detection. main aim this study was to determine the relationship between breakdown pre-breakdown mode transition. model established by Niemeyer, as adapted impulse voltage, expanded. images phase-resolved patterns a function applied voltage were analyzed observe...
The trend of development Gas Insulated System (GIS) recently includes: miniaturization, intelligentization and high reliability. This needs a higher insulation performance GIS. Free conducting particle in GIS is main reason that causes the degradation insulation. will bring risk to when it approaches voltage conductor or reaches disc-type insulator surface. Particle radial non-uniform electrical field apt move along direction GIS, probably moves into region. According distribution between...
The basin-type insulator is one of the most important parts in SF <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</inf> gas insulated switchgear (GIS). Flashover insulators will cause serious harm to electrical system. fact that metallic particle attached surface cannot be detected delivery test under standard lightning impulse (SLI) pose potential threat GIS. This paper studied flashover characteristics with contamination its high voltage...
In the operation of HVDC GIL (Gas-insulated Transmission Line), cone-type insulator can separate SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> chambers, support HV conductor and play role electric insulation. However, with long-term applied voltage, charges are prone to accumulate on surface, which lead decrease flashover voltage threaten stability power system. Besides, existence metallic particles inside chamber, especially those...
Gas insulated switchgear (GIS) is widely applied in power systems due to its excellent insulation performance. The reliability of GIS will be influenced by various defects generated during the manufacture, installation, adjustment, operation and maintenance apparatus. Some defects, including conductor spikes, free metal particles, etc., make local electric field higher. Due HUMP effect SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub>...
Excess moisture in GIS will condense on solid insulating materials under certain environmental conditions and cause the reduction of flashover voltage, thus threatening its normal operation. To formulate proper standard content GIS, it's necessary to study influence dielectric strength insulators. In this paper, voltage insulators SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> is studied with consideration ambient temperature. The...
The flashover of insulators is a bottleneck for the development gas insulated transmission line (GIL). operation experience GIL shows that metallic particle plays an important role in insulator. An experiment platform was established to study influence pressure on characteristics post insulator SF6 under negative DC voltage. impacts position and size had were also studied. distribution electric field processed by finite element analysis software. results indicate voltage reaches maximum...
Insulators are under residual DC voltage after opening of disconnectors. When disconnectors reclose, overvoltage will be superimposed on the pre-existing voltage. As a result, insulators in GIS combined and impulse. In this paper, flashover characteristics SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> studied lightning The results show that for non-contaminated insulators, pre-stressed doesn't affect if it is same polarity with...