The motion of electrons in SF₆ in uniform electric fields is simulated using a Monte Carlo technique for the range of reduced electric fields 100≤E/p≤180 V cm⁻¹ Torr⁻¹. The swarm parameters evaluated are compared with the experimental results of drift velocity, ratio of diffusion coefficient to mobility, ionization, and attachment coefficients. The electron‐molecule collision cross sections adopted in the simulation result in a good agreement with the experimental values over the range of E/p investigated.

Prebreakdown ionization currents have been measured in SF₆, N₂, and SF₆+N₂ mixtures by the Townsend method over the E/p range 100–450 V cm⁻¹ Torr⁻¹. A digital computer analysis is used for evaluation of the ionization and attachment coefficients. The variation of (α−η)/p in SF₆ and N₂ mixtures is found to be nonlinear with the percentage mixture ratio. Sparkover voltage measurements are carried out for SF₆, N₂, and SF₆+N₂ mixtures in the pd interval of 3.5≤pd≤25 Torr cm. Furthermore, the apparent secondary ionization coefficients have been deduced in SF₆+N₂ mixtures. They decrease significantly with increasing partial pressure of SF₆. The reduction observed in this coefficient is attributed to the increased photon absorption coefficient.

In the case of undistorted and balanced grid voltages, low ratio shunt active power filters (APFs) can give unity power factors and achieve current harmonic cancellation. However, this is not possible when source voltages are distorted and unbalanced. In this study, the cost-effective hybrid active power filter (HAPF) topology for satisfying the requirements of harmonic current suppression and non-active power compensation for industry is presented. An effective strategy is developed to observe the effect of the placement of power capacitors and LC filters with the shunt APF. A new method for alleviating the negative effects of a nonideal grid voltage is proposed that uses a self-tuning filter algorithm with instantaneous reactive power theory. The real-time control of the studied system was achieved with a field-programmable gate array (FPGA) architecture, which was developed using the OPAL-RT system. The performance result of the proposed HAPF system is tested and presented under nonideal supply voltage conditions.

Reports electron swarm parameters in SF₆ in uniform E*B fields employing a Monte Carlo simulation technique. The parameters studied are transverse and perpendicular drift velocities, magnetic deflection angle, collision frequency, mean energy and effective ionization coefficients for 30<or=E/p<or=200 V cm^-1 Torr^-1 and 0<or=B/p<or=6*10 T Torr^-1. At a given E/p, application of a magnetic field causes decreases in the transverse drift velocity, the mean energy and the effective ionization coefficient. The validity of the effective reduced electric field concept is also investigated for the evaluated collision frequency, mean energy and effective ionization coefficient.

Steady-state ionization growth currents have been measured in N2 and SF6 + N2 mixtures in the E/N range of 1.82×101-15 ≤ E/N ≤ 2.58×10-15 V cm2. Least-square analysis is used for the evaluation of apparent ionization, ionization, and attachment coefficients. Experimental E/N limits are observed for several SF6 concentrations in the mixture. The variation of (α-η)/N is non-linear with the percnetage mixture ratio.