The formation of uniform dielectric barrier discharges (DBDs) under atmospheric pressure is a remarkable achievement with the addition of electronegative gasses in closed reactors. This work is the part of dielectric barrier discharge achieved under atmospheric pressure. A uniform glow discharge is produced in capacitive discharge reactor. An alternating voltage source (0-2.5) kV having frequency of 50Hz is applied across the two parallel disc electrodes. A couple of dielectrics (glass) used as a discharge barriers one on each electrode. The oxygen gas injected into the reactor controlled by mass flow controller with flow rate 30ml/min. The current-voltage waveforms for oxygen discharge achieved, fulfilling the basic conditions of discharge homogeneity. The diagnostic techniques rely on electrical discharge method and power balance method to differentiate discharges and estimate the electron density for different values of applied voltages. A significant relation is found indicating the variation of electron density with applied voltage.

Effect of varying voltage on electron density in oxygen homogeneous dielectric barrier discharge under atmospheric pressure

The invention discloses a method for evaluating plant-oil-paper insulation electrical aging life in view of dual parameters including temperature and moisture. The method comprises a first step of obtaining an influence rule of temperature and moisture on oil-paper insulation electric field distribution; a step 2 of separately establishing a dual-parameter electrical aging life model between electric field strength and temperature, and electric field strength and moisture; a step 3 of establishing a plant-oil-paper insulation electrical aging life general equation in view of dual parameters including temperature and moisture; and a step 4 of detecting the significance levels of various parameters of the plant-oil-paper insulation electrical aging life general equation in view of dual parameters including temperature and moisture by using stepwise regression analysis. In combination with the actual operation condition, the invention takes account of the synergistic effect of temperature and moisture which are two main factors influencing the safe operation factor of a transformer, and provides the multi-factor plant-oil-paper insulation electrical aging life evaluation method to establish oil-paper insulation safety and reliability evaluation strategy under different operating conditions.

Method for evaluating plant-oil-paper insulation electrical aging life in view of dual parameters including temperature and moisture

Characterization of the Dielectric Barrier Discharge Thruster for Microsatellite Applications

The electrical and optical characteristics of DBD are different from those of bare electrodes, while the Paschen curve reflects the relationship between breakdown voltage and gas pressure and gap distance. The specific characteristics in DBD need to be differentiated. The electrical characteristics of DBD are closely related to the discharge mode. The mode of DBD discharge can be divided into filamentous discharge and uniform discharge. The plasma contains a large number of excited particles, which radiate at low energy level. After being recorded by ICCD camera, the emission spectrum of plasma can be obtained. By analyzing the intensity and location of the spectrum, we can get a lot of information inside the plasma, such as electron excitation temperature, excited particle species, relative number density and the width of cathode falling zone, etc. The spectral diagnostic method used in this experiment is a non-contact plasma diagnosis method. First, based on the experimental platform of plasma, a DBD device for parallel plate electrode is set up. The medium frequency power supply is 22.0kHz, the working gas is argon, through the observation of the initial discharge voltage, discharge current, ICCD image, study the Paschen curves' characteristic of Ar-DBD, to investigate the mechanism of discharge, volt ampere characteristics and discharge mode evolution characteristics of argon gas, familiar with DBD. Then, through the ICCD camera emission spectra and nanosecond discharge dynamics image shooting, evolution of its time and space, including types, the discharge process of energetic particles in the reaction particle concentration, the cathode falls region width and electron excitation temperature relationship.

Discharge characteristics of argon atmosphere dielectric barrier with different p d values

The utility model discloses an electric aging equipment of oil -paper insulation examination article, epoxy board and fixed plate including parallel arrangement, be provided with electrode and bottom electrode between epoxy board and the fixed plate, the top surface of going up the electrode is continuous with the center department of epoxy board through last electrode axle, the bottom surface of bottom electrode links to each other with the one end of bottom electrode axle, the other end of bottom electrode axle passes the fixed plate center and locates through -hole of seting up and the bottom that extends to the fixed plate, the one end of scalable lever connects with the extension end hinge of bottom electrode axle, its other end is the free end, and the greatest length of scalable lever is greater than the length at its pin joint to fixed plate edge, the bottom electrode of spring suit between bottom electrode and fixed plate is epaxial, during the use, oil -paper insulation examination article set up between last electrode and bottom electrode to it is tight through the spring clamp. The utility model has the advantages of it is following: it is more laborsaving during article to insert and put the examination, can one -man operation, the lever structure adopts scalable adj. Tabular design not occupy unnecessary space.

Electric aging equipment of oil -paper insulation examination article

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Discharge characteristics of argon atmosphere dielectric barrier with different p d values

Electric aging equipment of oil -paper insulation examination article