High-temperature gas breakdown characteristic detection device and method under VFTO condition

Abstract

The invention provides a high-temperature gas breakdown characteristic detection device and method under the VFTO condition. The device achieves detection of the gas breakdown process under the VFTO condition. The device comprises a gas sealing chamber, a heating unit, a discharging unit, a spectrometer, a thermodetector, a gas inflating, deflating and recycling unit, a voltage source, a VFTO generation unit, an ampere meter and a computer. The method detects the gas breakdown process from the microcosmic viewpoint, the spectrometer is used for measuring light intensity and wave length in the breakdown process, the temperature of particles in the breakdown process is obtained, and the viscosity coefficient, the conductivity and the diffusion coefficient of the particles are further obtained. According to particle collision characteristics under the VFTO condition, a collision item of a Boltzmann equation is corrected.

Description

technical field [0001] The invention belongs to the field of gas discharge, and in particular relates to a device and method for detecting breakdown characteristics of high-temperature gas under VFTO. Background technique [0002] A considerable amount of research work has been done on the breakdown characteristics of gas, liquid and solid dielectrics under normal conditions such as direct current and power frequency alternating current. In recent years, dielectric insulation properties under extreme conditions and gas discharge laws in different forms and conditions have caused Wide attention at home and abroad. In ultra-high voltage GIS (Gas Insulated Switchgear, fully enclosed combined electrical appliances), due to the high re-ignition frequency during the operation of the isolation switch, VFTO (Very Fast Transient Over-voltages, fast transient overvoltages) of tens of MHZ will be generated, which will endanger the switch breaking performance. Therefore, it is of grea...

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Problems solved by technology

Therefore, it is of great significance to study the gas breakdown process under VFTO conditions. However, the current detection methods for gas breakdown characteristics under VFTO conditions are not perfect.

Under the condition of VFTO, the state of the plasma during the gas breakdown process is often non-equilibrium, and the collision process between particles should be considered, which needs to be described by a non-Boltzmann distribution function, and because the frequency of VFTO is extremely high, the breakdown The collision between particles in the process is different from the collision between particles under power frequency voltage. The original Boltzmann collision model cannot be applied to this extreme situation.

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