Time enlargement law for gas pulse breakdown

Abstract

This paper investigates the possibility of applying the time enlargement law for predicting how gas-insulated systems would behave when exposed to pulse voltage loads of different shapes. For this purpose, the validity of the time enlargement law in this case has first been tested and the most suitable theoretical distribution function of the breakdown time random variable established. Pulse characteristics of the investigated insulating system have subsequently been determined, by applying the time enlargement law to experimental values of the breakdown time random variable, obtained in measurements with predefined shapes of the voltage load. Pulse characteristics thus obtained were compared with the corresponding pulse characteristics derived from the area law. The results demonstrate the advantages of the time enlargement law method, especially in the case of a non-homogeneous electric field. The experiments were conducted with SF 6 gas, at different values of the pd product (pressure × inter-electrode gap), in a wide frequency range of applied pulse voltages, for a homogeneous, radial and point-plane electrode configuration.

The Influence of the Magnetic Field on DC and the Impulse Breakdown of Noble Gases

“…If the secondary processes that are active in the gas dominate over the secondary processes that are active on electrodes, the breakdown takes place with the streamer mechanism. This occurs in the case where the characteristic dimensions of the insulation system are significantly greater than the mean free path length of the electron [19,20]. The condition for a streamer breakdown in a non-homogeneous electric field is ∫0dα(x)dx=10.5…”

The influence of magnetic field shape on dielectric characteristics of vacuum switches

“…(3) Each statistical sample exhibited somewhat random variable tendency that was examined by theoretical distribution functions (normal, Weibull, and exponential [20,21]). …”

Free‐Electron Gas Spectrum Uniqueness in the Mixture of Noble Gases

“…Due to the likelihood that electron velocity would increase after a collision has been carried out is identical to the probability for its decrease [11][12][13]. In the event of such a gas mixture reaching an electric field by way of all charged components' velocities, then their velocity, which is determined by thermal equilibrium, becomes superimposed by a component in the direction of the field.…”

“…Furthermore, it follows that electron-atom collisions do not spoil the spectrum nature in view of the fact that they are elastic. Due to the likelihood that electron velocity would increase after a collision has been carried out is identical to the probability for its decrease [11][12][13]. What is more, this supposition would not be applicable for molecular gases in view of the fact that the possibility of exciting rotational and vibrational quantum-mechanical states would render the collisions inelastic resulting in a lower-energy spectrum shift.…”